Professionalism 2/10 Drawing 2/10 smooth delivery 3/10 Information covered 10/10 Time spent on each subject area 10/10 Approachability 10/10 Helping people understand haphazardly 11/10 How much I now understand vs other vidoes 9000/10 Average 1131/10 < don’t worry I have done the maths. Don’t change anything, this is just what we are looking for. We don’t want shiny people that gloss over bits they don’t know. We want the stage to fall over and the drawings iffy.
These videos are fantastic. Lots of good, real information! Please do more, I would love to see air dam design, cooling air inlet/engine bay venting, wheel well aero, flat bottom, side skirts, spoilers and wings, and diffusers. I think that basically covers everything lol but you explain it so well I would watch it all!
Thank you for reminding us we are all human and incapable of being perfect at all things. Great explanation, makes excellent sense to me. I look forward to seeing more information downforce. Keep up the great work.
it would be helpful to also show how the drawing relates to the actual implementation on the vehicle but the rest I loved so thank you very much for the explain
Great video. My questions about how diffusers increase down force, and what a good ride height range is, were both answered in the comments. I want to take advantage of some diy aero for my budget endurance racecar (champcar, lucky dog racing league, etc.) with a focus on durability vs all out performance. Subscribed, and looking forward to your next video!
nice video and explanations. being a big diy'er i recently made some splitter diffusers simular to your 'monster' design. i cant wait to get back out onto the track and 'feel' the difference.
This isn't exactly what you're looking for but it's a start professionalawesome.com/low-power-miata-aerodynamic-testing/. We will be working on more videos as soon as the pandemic calms down.
Stronger with more weight. Personally, the longer we do this racing stuff, the more I sacrifice weight for strength and reliability. So I feel it's a good choice!
Does the inlet of the splitter difuser face the front of the vehicle? Or is the diffuser supposed to look like a ramp, and have the opening to the back or the splitter?
Can you share any resources on how to calculate front end downforce based on splitter size? Looking to build an appropriate sized front splitter to balance the rear air foil accordingly.
Unfortunately, there's no great resource or universal answer, but a cool and easy to understand article was written by Verus Engineering that I like. www.verus-engineering.com/blog/cfd-cases-4/air-dam-or-splitter-a-closer-look-12 Additionally, Simon McBeath's book, Competition Car Aerodynamics, has some great case studies with CFD and wind tunnel data that have info on front splitters. He also has some great articles in the magazine Racecar Engineering that are very useful, but you have to do a lot of digging to find the best ones unfortunately.
One more thing, make sure to match aero balance with weight balance. If you car is 50/50 weight distribution, try to keep aero balance close to that. If it's 60% front / 40% rear, you need to have ~60% front aero / ~40% rear.
@@ProAwesomeRace I roughly knew this from the beginning but it was actually your aero balance blog post that has sent me down the rabbit hole trying to learn/calculate. So, thanks for putting out good material.
I know this video is 3 years old but have a question about side skirts. I have a 19 c7z06 with nine lives wing, custom made large front splitter with diffusers. Looking to do more so now moving to rear diffuser and side skirts. I have the factory side skirts and a little trick I don't share to often which dropped lap time consistently over 5 tenths in back to back testing over 2 year. I take rubber from a company called all fit and run about 3 to 5 inches in from the edge of side skirts and go close to the ground as I can get so creating a rubber side sealed tunnel. Now to may question. Can extended side skirts improve downforce or reduce drag. So in a sense a splitter for the sides of the car. I've seen companies sale this and people install typically flat abs but don't see how it would help. Even more so with my tunnel under the car. Let me know if you have any thoughts or any testing for this idea. I know it's an old concept put not much information out there about it and I've never tested it.
Thanks for the info on the rubber seals. To your question, yes, extended side skirts can help in a few ways. First, remember when you are in turns there is a yaw moment to the car so air is hitting it at an angle. This slight angle can help produce higher loads on top of a side skirt than the bottom, creating downforce. Additionally, it can keep airflow from the top surface of the car interacting with the bottom, which can help downforce and drag. Exactly how much is very dependent though. Testing would need to be done and the gains are much smaller than a front splitter. That being said, the same principles apply, closer to the ground the better. The longer the extension, the gains will drop off.
@@ProAwesomeRace im on youre site right now a out to buy the splitter rotary latches and rods. Just would like to see how everything is attacked to the splitter.
Wouldn't a slightly high concave front of the splitter not force more air under the splitter and thus speeding the air up further decreasing the pressure and adding downforce?
This is a very common practice in higher levels of motorsports, but a little difficult to perfect. It's one I'd recommend testing, but with an understanding that it might be hard to dial in exactly to your expectations. Additionally, it will have greater downstream effects. So any rear aero may or may not work as intended. Sorry for not being able to give more detail, but ever car starts to get more case specific the more complicated the aero structures.
I have a question, I was thinking of using diffusers on both sides of splitter to cool down brakes, is it good idea? Using some sort of steering angle vents like focus rs mk3? Will it work?
Sorry for the late reply. Most certainly the diffusers can help with brake cooling but not to the same degree as a well designed inlet duct in the front bumper. Depends on how much cooling you need.
How much ride height do you have to run a splitter like this for you to see some reasonable benefits? Obviously it's not gonna work on a lifted truck, but what about an average sedan? Say about 6 inches-ish?
A splitter will work 6" off the ground but the effectiveness of it is reduced. If the suspension is properly setup, going as low as possible is the best bet. 2.75" or so is where I'd like to be as a good compromise between the splitter hitting the ground and getting the best aero performance.
Great video. Thanks for putting it together. Is there a way for us layman to measure how much downforce we are getting? Is there some kind if balance to aim for between the splitter on front front spoiler or wing in the back? Any suggestions or recommendations on a spoiler put back? Working with a 4th gen Camaro and although I know I'd get more downforce with a wing it just doesn't look right. Wondering how much rear downforce I might be able to get out of something like a Wicker Bill spoiler.
This book here has a great section on rear spoilers: amzn.to/2NrV9Ki. We used 4 very inexpensive sensors to measure suspension travel, kind of like these: amzn.to/3pi6r23. As long as they output 5 volt signal, you can use them with a datalogging system. You have to do math to covert the signal into wheel movement and then compare them against the spring rates to get a rough amount of downforce. Make sure to keep in mind the difference between wheel and spring rates. With this data, it can help you balance the front vs. rear downforce. Hope this helps!
Just found your channel now. Awesome content right here. What materials would you say are ok for a front spoiler/air dam? Glass and carbon fiber, sure, but what about plywood or similars?
Hey guys. Asked on reddit too but we’d love to have you as podcast guests to talk about aero, specifically for the Exocet if you’re familiar. Whatcha think?
This is for a Miata right? Can you show where those front mounts are from on the chassis side? I plan to make one of these for my Nb and any help would be awesome
Head over to MotoIQ for a bit more specifics on that Miata project: motoiq.com/project-my-fiancees-miata-part-11-how-to-add-a-professional-awesome-splitter-an-apr-performance-wing-and-improve-your-lap-times/
Rigid mounts for the main attachment by the core support, then somewhat flexible at the outer locations. You want the blade to flex when going over curbs. This is why we use cables at the edges.
How far back from the leading edge of the splitter would be a good point to start the front diffusor (How much flat area is needed infront of the front diffusor)? Noticed you recommended some of the front diffusor to vent into the suspension area and some of it straight in to the tire. I might have minsunserstood but why ist this? Thanks!
Jimmy, we generally allow 3-5" before the diffusers to allow for attachment. It's not a requirement as every application is different but it's a good rule of thumb. Testing with strings will give you a good idea if the diffusers are working. We recommend directing the diffuser outlet half on the tire and have to the open suspension area as it allows the air to escape to the easiest path. Some cars, pointing at the tire is best, some cars pointed at the suspension is best, but half and have is a good compromise.
thanks. I have a very simple question. why tilting towards the ground the splitter will be better in generating more DF? wouldn't it loose the pressure on top ( air will move under cause it is not really'split') reducing DF? in another videoan engeneer saidthat in theory lifting up the front splitter will alow more air to go under the car ,increasing the volume, increasing the speed, and as consequence having a even bigger lower pressure under the car? please let me know and thanks for the videos!
The slight angle towards the ground will turn the whole splitter into a large diffuser which helps with downforce. Raising the leading edge can make more downforce if the whole system is made to work together. Raising the front edge too much will greatly hurt front downforce. These designs are intended to be simple to produce but effective. There are many ways to do it but we wanted to highlight what works.
@@ProAwesomeRace so you mean if there is a flatfloor and a rear diffuser the whole system will generate more DF? last, i promise :) what make a splitter generating DF? The high pressure on top that"push down" the front or the fast air/lower pressure under that suck down there splitter? Thanks again.
@@italian_stang Correct. If done correctly a curved shape for the front of the splitter will make more overall downforce with a full flat bottom in most cases. A splitter will make downforce on both the top and the bottom if designed correctly.
Generally if you are in a lower class you should maximize the length allowable. For unlimited 8-10" is the sweet spot in our testing to balance downforce and drag.
Do you have a link to the 2 diffuser products you have shown in the video? Also love your Evo 8 time attack car. That's actually my old car. Glad it ended up in a good home!
Forgive us for not going into more detail on specifics. Essentially, air is "squeezed" under the splitter into the entrance of the diffuser. The diffuser is closest to the ground at this point, the ramp of the diffuser expands, creating a larger volume for the air. If done properly, this will speed up the air under the splitter, reducing air pressure. The high pressure on the top of the splitter, caused by the air dam slowing the velocity of the air, will create a large pressure differential, pulling the splitter down towards the ground, which is downforce! Check here for information on the physics we are taking advantage of. en.wikipedia.org/wiki/Venturi_effect For more specifics on downforce in relation to cars, check our written series here. professionalawesome.com/diy-downforce/
Can you provide any resources on how to calculate approximate downforce produced by a front splitter? Doesn’t make much sense to make one of it doesn’t pair well with the rear end.
Not to be an armchair aerodynamicist, but the placement of those diffusers doesn't totally make sense to me. Any air coming out of there would head right into tire squirt and get all turbulent. Wouldn't you want them more central and ducted to an oil cooler or something if you're going to use them at all?
Monty, often our intuition gets us in trouble with aero. A decade ago, I'd agree with you completely, but the CFD and wind tunnel data I've seen suggests firing the diffusers at the tire actually does the opposite. It lowers the pressure zone where the tire meets the tarmac. You get a double benefit of lower air pressure at the leading edge of the diffuser and where the tire squirt occurs. Certainly each car will react differently when trying this so I'm not saying this solution will work on all cars and all situations, but from what I've seen, it's safe to utilize this method for most applications.
Professionalism 2/10
Drawing 2/10
smooth delivery 3/10
Information covered 10/10
Time spent on each subject area 10/10
Approachability 10/10
Helping people understand haphazardly 11/10
How much I now understand vs other vidoes 9000/10
Average 1131/10 < don’t worry I have done the maths.
Don’t change anything, this is just what we are looking for. We don’t want shiny people that gloss over bits they don’t know. We want the stage to fall over and the drawings iffy.
THIS!!!!!!! This is what I've been looking for! Excellent video!
I just love how honest he is. So refreshing! Now, on to make a splitter!!!
These videos are fantastic. Lots of good, real information! Please do more, I would love to see air dam design, cooling air inlet/engine bay venting, wheel well aero, flat bottom, side skirts, spoilers and wings, and diffusers. I think that basically covers everything lol but you explain it so well I would watch it all!
Starting my splitter build. So glad I found your channel. You can thank gears & gasoline 🙏🏾
They're the best!
Check out www.professionalawesome.com/diy-downforce/ for more info as well.
this is the most educational splitter video i have seen such underrated content! can't wait to do business with you fine folks!
This is perfect series for my diy full under aero planning for winter project
Liked for the first 5 seconds
Thank you for taking the time to explain this in detail. It's got me pumped and excited to try my hand at making a 3D splitter!
Endplates!! I'd love a video explaining the different types of splitter endplates
Fantastic information here! Thank you.
Thank you for reminding us we are all human and incapable of being perfect at all things. Great explanation, makes excellent sense to me. I look forward to seeing more information downforce. Keep up the great work.
Seriously looking forward to the next episode! So much good info in these! Thank you so much for taking the time to do this!
very informative underrated content
John Burk of splitter design...great content =-D
Good job, I would have liked to make more videos. We will be watching from Spain. Regards.
it would be helpful to also show how the drawing relates to the actual implementation on the vehicle
but the rest I loved so thank you very much for the explain
Super Informative video on splitter design. Got a lot of good stuff to check out and think about when designing.
These guys are legit. Following their advice my car can now drive upside down!!
Need video proof!
This dude is pretty funny and very informative
Great video. My questions about how diffusers increase down force, and what a good ride height range is, were both answered in the comments. I want to take advantage of some diy aero for my budget endurance racecar (champcar, lucky dog racing league, etc.) with a focus on durability vs all out performance. Subscribed, and looking forward to your next video!
cool thanks man
finally something helpful
Are you guys considering continuing this series by chance?
nice video and explanations. being a big diy'er i recently made some splitter diffusers simular to your 'monster' design. i cant wait to get back out onto the track and 'feel' the difference.
16:35 that headshake...
i would love a side-by-side comparison on laptimes with having the splitter diffusers on vs. off.
This isn't exactly what you're looking for but it's a start professionalawesome.com/low-power-miata-aerodynamic-testing/. We will be working on more videos as soon as the pandemic calms down.
So many secrets!!!!
How does solid core aluminum composite, compare to corrugated?
Stronger with more weight. Personally, the longer we do this racing stuff, the more I sacrifice weight for strength and reliability. So I feel it's a good choice!
Does the inlet of the splitter difuser face the front of the vehicle? Or is the diffuser supposed to look like a ramp, and have the opening to the back or the splitter?
If you imagine it like a triangle, the pointy end goes towards the front of the car and the big end points towards the back.
Can you share any resources on how to calculate front end downforce based on splitter size? Looking to build an appropriate sized front splitter to balance the rear air foil accordingly.
Unfortunately, there's no great resource or universal answer, but a cool and easy to understand article was written by Verus Engineering that I like. www.verus-engineering.com/blog/cfd-cases-4/air-dam-or-splitter-a-closer-look-12
Additionally, Simon McBeath's book, Competition Car Aerodynamics, has some great case studies with CFD and wind tunnel data that have info on front splitters. He also has some great articles in the magazine Racecar Engineering that are very useful, but you have to do a lot of digging to find the best ones unfortunately.
One more thing, make sure to match aero balance with weight balance. If you car is 50/50 weight distribution, try to keep aero balance close to that. If it's 60% front / 40% rear, you need to have ~60% front aero / ~40% rear.
@@ProAwesomeRace I roughly knew this from the beginning but it was actually your aero balance blog post that has sent me down the rabbit hole trying to learn/calculate. So, thanks for putting out good material.
I know this video is 3 years old but have a question about side skirts. I have a 19 c7z06 with nine lives wing, custom made large front splitter with diffusers. Looking to do more so now moving to rear diffuser and side skirts. I have the factory side skirts and a little trick I don't share to often which dropped lap time consistently over 5 tenths in back to back testing over 2 year. I take rubber from a company called all fit and run about 3 to 5 inches in from the edge of side skirts and go close to the ground as I can get so creating a rubber side sealed tunnel. Now to may question. Can extended side skirts improve downforce or reduce drag. So in a sense a splitter for the sides of the car. I've seen companies sale this and people install typically flat abs but don't see how it would help. Even more so with my tunnel under the car. Let me know if you have any thoughts or any testing for this idea. I know it's an old concept put not much information out there about it and I've never tested it.
Thanks for the info on the rubber seals. To your question, yes, extended side skirts can help in a few ways. First, remember when you are in turns there is a yaw moment to the car so air is hitting it at an angle. This slight angle can help produce higher loads on top of a side skirt than the bottom, creating downforce. Additionally, it can keep airflow from the top surface of the car interacting with the bottom, which can help downforce and drag. Exactly how much is very dependent though. Testing would need to be done and the gains are much smaller than a front splitter. That being said, the same principles apply, closer to the ground the better. The longer the extension, the gains will drop off.
Are you going to make the 3rd video??
Appreciate the question. The answer is, eventually. Is there anything specifically you'd like to learn about?
@@ProAwesomeRace im on youre site right now a out to buy the splitter rotary latches and rods. Just would like to see how everything is attacked to the splitter.
How do side skirts affect your aero balance? Seems like it doesn’t do much compared to a splitter or wing.
Wouldn't a slightly high concave front of the splitter not force more air under the splitter and thus speeding the air up further decreasing the pressure and adding downforce?
This is a very common practice in higher levels of motorsports, but a little difficult to perfect. It's one I'd recommend testing, but with an understanding that it might be hard to dial in exactly to your expectations.
Additionally, it will have greater downstream effects. So any rear aero may or may not work as intended.
Sorry for not being able to give more detail, but ever car starts to get more case specific the more complicated the aero structures.
I have a question, I was thinking of using diffusers on both sides of splitter to cool down brakes, is it good idea? Using some sort of steering angle vents like focus rs mk3? Will it work?
Sorry for the late reply. Most certainly the diffusers can help with brake cooling but not to the same degree as a well designed inlet duct in the front bumper. Depends on how much cooling you need.
Is there any other parts can only see part one and two ? Thanks
How much ride height do you have to run a splitter like this for you to see some reasonable benefits? Obviously it's not gonna work on a lifted truck, but what about an average sedan? Say about 6 inches-ish?
A splitter will work 6" off the ground but the effectiveness of it is reduced. If the suspension is properly setup, going as low as possible is the best bet. 2.75" or so is where I'd like to be as a good compromise between the splitter hitting the ground and getting the best aero performance.
Great video. Thanks for putting it together. Is there a way for us layman to measure how much downforce we are getting? Is there some kind if balance to aim for between the splitter on front front spoiler or wing in the back? Any suggestions or recommendations on a spoiler put back? Working with a 4th gen Camaro and although I know I'd get more downforce with a wing it just doesn't look right. Wondering how much rear downforce I might be able to get out of something like a Wicker Bill spoiler.
This book here has a great section on rear spoilers: amzn.to/2NrV9Ki.
We used 4 very inexpensive sensors to measure suspension travel, kind of like these: amzn.to/3pi6r23.
As long as they output 5 volt signal, you can use them with a datalogging system. You have to do math to covert the signal into wheel movement and then compare them against the spring rates to get a rough amount of downforce. Make sure to keep in mind the difference between wheel and spring rates. With this data, it can help you balance the front vs. rear downforce. Hope this helps!
@@ProAwesomeRace awesome! Thank you very much!
Just found your channel now. Awesome content right here. What materials would you say are ok for a front spoiler/air dam? Glass and carbon fiber, sure, but what about plywood or similars?
We use ABS plastic, Alumalite, expanded PVC and a few more similar items. You'll want something flexible to go around a curve.
Hey guys. Asked on reddit too but we’d love to have you as podcast guests to talk about aero, specifically for the Exocet if you’re familiar. Whatcha think?
Sounds good to me. Send an email over to sales@professionalawesome.com and let's setup a time!
This is for a Miata right? Can you show where those front mounts are from on the chassis side? I plan to make one of these for my Nb and any help would be awesome
Head over to MotoIQ for a bit more specifics on that Miata project: motoiq.com/project-my-fiancees-miata-part-11-how-to-add-a-professional-awesome-splitter-an-apr-performance-wing-and-improve-your-lap-times/
Do you prefer rigid mounts or mounts that allow some deflection upwards? Either due to curbing or dips?
Rigid mounts for the main attachment by the core support, then somewhat flexible at the outer locations. You want the blade to flex when going over curbs. This is why we use cables at the edges.
How far back from the leading edge of the splitter would be a good point to start the front diffusor (How much flat area is needed infront of the front diffusor)?
Noticed you recommended some of the front diffusor to vent into the suspension area and some of it straight in to the tire. I might have minsunserstood but why ist this?
Thanks!
Jimmy, we generally allow 3-5" before the diffusers to allow for attachment. It's not a requirement as every application is different but it's a good rule of thumb. Testing with strings will give you a good idea if the diffusers are working.
We recommend directing the diffuser outlet half on the tire and have to the open suspension area as it allows the air to escape to the easiest path. Some cars, pointing at the tire is best, some cars pointed at the suspension is best, but half and have is a good compromise.
Where is part 3 showing install
Tips on the car?
We are planning to do more soon! Thanks for being patient.
Do you install winglets
Can you clarify, what do you mean by winglets? Or do you mean do we work on customer cars? We don't do any customer work.
thanks. I have a very simple question. why tilting towards the ground the splitter will be better in generating more DF? wouldn't it loose the pressure on top ( air will move under cause it is not really'split') reducing DF? in another videoan engeneer saidthat in theory lifting up the front splitter will alow more air to go under the car ,increasing the volume, increasing the speed, and as consequence having a even bigger lower pressure under the car? please let me know and thanks for the videos!
The slight angle towards the ground will turn the whole splitter into a large diffuser which helps with downforce. Raising the leading edge can make more downforce if the whole system is made to work together. Raising the front edge too much will greatly hurt front downforce. These designs are intended to be simple to produce but effective. There are many ways to do it but we wanted to highlight what works.
@@ProAwesomeRace awesome. Thanks for the reply.
@@ProAwesomeRace so you mean if there is a flatfloor and a rear diffuser the whole system will generate more DF?
last, i promise :) what make a splitter generating DF? The high pressure on top that"push down" the front or the fast air/lower pressure under that suck down there splitter? Thanks again.
@@italian_stang Correct. If done correctly a curved shape for the front of the splitter will make more overall downforce with a full flat bottom in most cases. A splitter will make downforce on both the top and the bottom if designed correctly.
@@ProAwesomeRace very nice. Thank you
Is a splitters length proportional to the speed the vehicle is traveling? Eg. 200mph vehicle have a shorter splitter or maximise the allowable length.
Generally if you are in a lower class you should maximize the length allowable. For unlimited 8-10" is the sweet spot in our testing to balance downforce and drag.
Do you have a link to the 2 diffuser products you have shown in the video? Also love your Evo 8 time attack car. That's actually my old car. Glad it ended up in a good home!
They're all located here: professionalawesome.com/product-category/aerodynamics/
@@SteveBrownRacing Thanks man. Dallin, just doing what we can to make it fast.
If I wanted to try to make my own splitter diffusers, would the guideline for rear diffusers of less than 10° from parallel still be ideal?
Yes that would still be a good guideline. The most important part is the transition, which is why ours have the shape they do.
@@ProAwesomeRace Good to know. I'd probably just buy yours, but I was curious.
@@GasInMyVeins20AE Awesome. Yup, no problem. The transition is something to keep in mind if you make any diffusers, front or rear.
like just because he opened with part 2 MF'ers
Fuck yeah!
Where is part 3?
We are planning more, so sorry for taking so long!
@@ProAwesomeRace Awesome. Can't wait!
You didn't explain how the splitter diffusers work... For us dummies, I'll be buying them if I can figure out how they work
Forgive us for not going into more detail on specifics. Essentially, air is "squeezed" under the splitter into the entrance of the diffuser. The diffuser is closest to the ground at this point, the ramp of the diffuser expands, creating a larger volume for the air. If done properly, this will speed up the air under the splitter, reducing air pressure. The high pressure on the top of the splitter, caused by the air dam slowing the velocity of the air, will create a large pressure differential, pulling the splitter down towards the ground, which is downforce! Check here for information on the physics we are taking advantage of. en.wikipedia.org/wiki/Venturi_effect
For more specifics on downforce in relation to cars, check our written series here. professionalawesome.com/diy-downforce/
Can you provide any resources on how to calculate approximate downforce produced by a front splitter? Doesn’t make much sense to make one of it doesn’t pair well with the rear end.
Not to be an armchair aerodynamicist, but the placement of those diffusers doesn't totally make sense to me. Any air coming out of there would head right into tire squirt and get all turbulent. Wouldn't you want them more central and ducted to an oil cooler or something if you're going to use them at all?
Monty, often our intuition gets us in trouble with aero. A decade ago, I'd agree with you completely, but the CFD and wind tunnel data I've seen suggests firing the diffusers at the tire actually does the opposite. It lowers the pressure zone where the tire meets the tarmac. You get a double benefit of lower air pressure at the leading edge of the diffuser and where the tire squirt occurs. Certainly each car will react differently when trying this so I'm not saying this solution will work on all cars and all situations, but from what I've seen, it's safe to utilize this method for most applications.
thanks for your poor drawing and your awsome explanations :)
Kyle would not approve
Where is part 3 ?