While IRS and Drag Racing can be challenging, if you take these recommendations, use the info provided in the video and the description, and get the right combination put together you can lay down some serious 60' times! Go Fast, go straight! Be Safe!
Kevin, you are spot on. I understand this video is old, but I have been promoting this very info for a long time since my 2003 Cobra days. I’ve implemented everything I learned from those cars to the Challenger/Charger platform. 100% agree. We got some crazy IRS Dodges here in So Cal that I’ve done all the work on. The audience thinks all Challengers are wheel standers.
i've bracket raced a slower(low 12's, 1.6x 60') mazda RX7 (2700#) for about 12 years with the stock IRS. locking out movement of the cradle and diff are critical, as is anything that can cause rear-steer. when it comes to squat, my car has no antisquat designed into it from the factory, so I'm only able to help it with springs, shocks, bushings, and tire pressure. The main thing with squat is to allow it only as necessary to transfer weight to the tires, if the spring rate is too soft the car will hit the bump stops, bounce and start a vicious cycle of wheel hop. with IRS, the antisquat is designed into the suspension from the factory at whatever it is, and generally there is no changing it, only working with what you've got. anyone getting an IRS car into the 1.2x 60ft range is doing amazing.
On my 2015 Charger Hellcat, I have invested in making my IRS as strong and resilient as possible with AAD billet suspension all around, BMR cradle lockouts, DSS axle half shafts and drive shaft and Per4mance Development DIRS and Race brace for the differential. To have strong and predictable parts for the driveline, I anticipate the new times and trap speeds will benefit from the specific preparation of the IRS. GREAT VIDEO
Hey Bro, I’ve done the same with my 2016 Challenger HC. Only diff was gforce half shafts. Was able to put down 0-60 in 2.5 sec past weekend. 1.5 60 ft. so I’m still working on that.
I race a miata mostly on the street and no prep events. From what I've learned, the worse the surface the more squat it seems to like, ive been low 1.3x on bad tracks, mid 1.3x's on the street on a 26x10 slick. The better the surface the more I tighten the rear compression to control the squat. Valving and spring rates are very important, ive sent shocks bacj and forth multiple times to get the right valving and spring rates for the surfaces I race on
Project X thanks so much for your comments! Sorry for responding so late. I don't take your support of my channel for granted. Hope you have a great rest of your weekend! Go fast, go straight! Be Safe!!
@@KevinWilsonSBC you had mentioned that you were going to go over a front and rear camber/toe setup. Is there any way you could make a more in depth video on that? Or at least throw out some numbers for reference?
Looking through the description, I planned to get with John Reed this year to get my 300C setup right. I think its close but could be a little better. Car made 485/444 on a mustang dyno. Car weighs 4150ish in race trim. Viking coilovers on all 4 corners, BMR control and lateral arm in the rear and polyurethane cradle bushings. Car has seen a best of 1.4 60ft, averages about 1.45 in the summer. On the hunt for 1.3s!!!
John Reed is definitely your next stop!! Hopefully they are Crusaders and not Warriors on the Viking shocks, but I will prepare you now, the Menscer shock package John will want to put you in are absolutely proven with the IRS dodge cars!!! Go fast, go straight! Be SAFE!!
@@gregleenyit honestly lots of racing and making passes. It averages low 1.5 high 1.4 60s on no prep just had to find a sweet spot with converter different rear spring front travel and how much nitrous to leave on.
Kevin, thank you for the videos and the information you are sharing. I have a 2012 Dodge Challenger that I drag race and have already knocked .2 sec off my 60' foot time following your advice with minor changes related to increasing stiffness within the IRS. My car is a manual transmission car. I have been using soft sided bias ply tires since I've started racing (~8 years). Would a stiffer sidewall radial help improve the launch or should I stick with soft sidewall tires? thanks again! rich
A radial dead hooked generally will outrun a slick. Dead hooking it is the challenge but as you see we got that part down with this hellcat. If track prep will not pull your shoes off then a slick is your friend. Go fast, go straight! Be SAFE!
@@KevinWilsonSBC i have irs pontiac gto have zero camber but to get zero camber i am stuck with .5mm toe out on my rh rear wheel. How much will this affect me? Lh side is 0.0 dead straight for toe.
Thanks great video I just came across it, what is you theory on setting the rake up on IRS car, run it level or slightly down in front compared to rear?
I got a 406 nitros in a c3 stock IRS with poly bushings and van steel strut rods and gymkana rear leaf with one extra leaf.. th400 with ATD brake and 390 rear 4500 stall... just got 90/10 calverts with 2" extentions up front... and qa1 Double adjustable in back. Cars 3klbs. I never hook I just spin. What would you recommend as a starting point for setting the qa1s? Oh I run 275/60/15 MT et-R
Unless they are the QA1 MOD series, I would highly recommend a shock more valved for IRS suspensions... The latest video of the Hellcat I posted shows the Menscer shocks on all 4 corners and it is night and day difference. Checkout ruclips.net/video/0fOdZGehSZ4/видео.html I would also recommend stronger valved shocks up front, especially with a Radial setup. Viking makes a "tie-down" valving that is good and will not break the bank. Go fast, go straight! Be SAFE!
@Kevin Wilson I soaked the tires with wd40 and with the qa1s set 6 compression and 8 extension it will hook now hard. I can't believe the difference. Thanks. No these are the made for a c3 $300 each QA1TD403
Camaro Drag Racing Second Generation thanks so much for your comments! Not sure why you cannot find me. Please make sure you are still subscribed. I am hearing being getting disconnected and I don't know why. Thanks for supporting my channel!! Go fast, go straight! Be Safe!!
@@KevinWilsonSBC Wish us racers could help set up people's cars online by watching videos of their cars I try helping many fellow racers no charge because i love the sport and want too see people go fast it took me 8 years too get my car too hook up because everything everyone said was the opposite of what they told me it was like they did it on purpose because they didn't want someone too go fast their is a bunch of secrets people would be surprised what it really takes too make a car go fast.
@@keysautorepair6038 I try my best to help everyone, especially with the videos. I am overwhelmed with emails asking for help, but I try to read everyone of them and offer some assistance. My main goal for the videos is to pay it back. So many have invested in me and I love our drag racing sport. I felt it best to invest back and do everything possible to help the grassroot racers that don't have sponsors or the ability to have new promod chassis' built each year. One thing that frustrates me are the racers who refuse to share or help others. Unfortunately, you can ask 10 racers and get 20 different opinions which has many people chasing rabbits, getting frustrating and parking their cars. Any ways, sounds like you agree and I appreciate you taking the time to comment and support the channel. My 76 year old is absolutely blown away with all this "youtube" stuff. The video content I have captured with him is absolutely priceless. Just being able to watch him on video and hear his voice is gold to me. I cherish everyday with him. My 19 year old son is starting to like "going fast" so this should be fun. Sorry for rambling, just felt like sharing some. Go fast, go straight! Be SAFE!!!!!
You mentioned Delrin bushings, but what about Aluminum or Polyeurethane? I read on garageistic that Delrin doesn't return to shape and if used in a car that features sharp impacts (like drift cars was their example) it may be better to go Poly (especially 80a hardness) for a more street oriented car or Aluminum for a more race oriented one.
@drunken Hamster Thank-you for responding! I am so glad you posted this, as I definitely prefer the aluminum bushings for full race for sure. We HAVE had good success with delrin (Made in the USA) bushings, but, as you stated, the aluminum bushings are the best for full race setup. I meant to include this when I recorded the video, but I just flat out forgot to discuss the roller bearing design. I meant to update the video description with this oversight, and now I will. Go fast, go straight! Be SAFE! KevinWilsonSBC
@@KevinWilsonSBC I was about to say you said nothing about the poly bushings, but then I checked the description after you mentioned that, too. Thanks for the response, and same to you on the "drive fast, be safe" part! :)
Why would u think anyone cares about some dude buying a 4 link? WTF does that have to do with anything? No one cares bro they came here for IRS tuning smh.
While IRS and Drag Racing can be challenging, if you take these recommendations, use the info provided in the video and the description, and get the right combination put together you can lay down some serious 60' times! Go Fast, go straight! Be Safe!
Any chance I can get some tips for a dct rwd irs car?
Kevin, you are spot on. I understand this video is old, but I have been promoting this very info for a long time since my 2003 Cobra days. I’ve implemented everything I learned from those cars to the Challenger/Charger platform. 100% agree. We got some crazy IRS Dodges here in So Cal that I’ve done all the work on. The audience thinks all Challengers are wheel standers.
i've bracket raced a slower(low 12's, 1.6x 60') mazda RX7 (2700#) for about 12 years with the stock IRS. locking out movement of the cradle and diff are critical, as is anything that can cause rear-steer. when it comes to squat, my car has no antisquat designed into it from the factory, so I'm only able to help it with springs, shocks, bushings, and tire pressure. The main thing with squat is to allow it only as necessary to transfer weight to the tires, if the spring rate is too soft the car will hit the bump stops, bounce and start a vicious cycle of wheel hop.
with IRS, the antisquat is designed into the suspension from the factory at whatever it is, and generally there is no changing it, only working with what you've got.
anyone getting an IRS car into the 1.2x 60ft range is doing amazing.
Excellent info Kevin. Been watching your videos for a while, trying to dial in my 15 Mustang’s IRS suspension.
Wampler Photo thanks for commenting. Go to samsonperformance.com and shoot me an email and I will respond. Go fast, go straight!
On my 2015 Charger Hellcat, I have invested in making my IRS as strong and resilient as possible with AAD billet suspension all around, BMR cradle lockouts, DSS axle half shafts and drive shaft and Per4mance Development DIRS and Race brace for the differential.
To have strong and predictable parts for the driveline, I anticipate the new times and trap speeds will benefit from the specific preparation of the IRS.
GREAT VIDEO
Hey Bro, I’ve done the same with my 2016 Challenger HC. Only diff was gforce half shafts. Was able to put down 0-60 in 2.5 sec past weekend. 1.5 60 ft. so I’m still working on that.
I race a miata mostly on the street and no prep events. From what I've learned, the worse the surface the more squat it seems to like, ive been low 1.3x on bad tracks, mid 1.3x's on the street on a 26x10 slick. The better the surface the more I tighten the rear compression to control the squat. Valving and spring rates are very important, ive sent shocks bacj and forth multiple times to get the right valving and spring rates for the surfaces I race on
Chase G thanks so much for your comments! Go fast, go straight! Be Safe!!
Deeply appreciate ya & the videos you put out Kevin! Keep up the great work!
Project X thanks so much for your comments! Sorry for responding so late. I don't take your support of my channel for granted. Hope you have a great rest of your weekend! Go fast, go straight! Be Safe!!
@@KevinWilsonSBC you had mentioned that you were going to go over a front and rear camber/toe setup. Is there any way you could make a more in depth video on that? Or at least throw out some numbers for reference?
Can you do more on this topic ? So many cars have irs these days Kevin
I would like to see some of that go pro action of rear end in action.
They are all linked in the description of this video.
This video is on point. Thank you
You're very welcome! Go fast, go straight! Be SAFE!
Looking through the description, I planned to get with John Reed this year to get my 300C setup right. I think its close but could be a little better. Car made 485/444 on a mustang dyno. Car weighs 4150ish in race trim. Viking coilovers on all 4 corners, BMR control and lateral arm in the rear and polyurethane cradle bushings. Car has seen a best of 1.4 60ft, averages about 1.45 in the summer. On the hunt for 1.3s!!!
John Reed is definitely your next stop!! Hopefully they are Crusaders and not Warriors on the Viking shocks, but I will prepare you now, the Menscer shock package John will want to put you in are absolutely proven with the IRS dodge cars!!! Go fast, go straight! Be SAFE!!
What was your settings on the rear compression and rebound was it prep or no prep
I've managed to get a 1.35 60' with a 85 C4 with dana 36. Not an easy task.
Very Impressive I would like to know how you accomplished that
@@gregleenyit honestly lots of racing and making passes. It averages low 1.5 high 1.4 60s on no prep just had to find a sweet spot with converter different rear spring front travel and how much nitrous to leave on.
You say we want to keep squat out of the car but how exactly can we accomplish that? Softer compression, firmer rebound?
Kevin, thank you for the videos and the information you are sharing. I have a 2012 Dodge Challenger that I drag race and have already knocked .2 sec off my 60' foot time following your advice with minor changes related to increasing stiffness within the IRS.
My car is a manual transmission car. I have been using soft sided bias ply tires since I've started racing (~8 years). Would a stiffer sidewall radial help improve the launch or should I stick with soft sidewall tires?
thanks again!
rich
A radial dead hooked generally will outrun a slick. Dead hooking it is the challenge but as you see we got that part down with this hellcat. If track prep will not pull your shoes off then a slick is your friend. Go fast, go straight! Be SAFE!
Kevin, I though you were going to give us some Camber and Toe numbers or did I misunderstand? Great info!
I gave you the camber and toe. 0 degrees camber and 1/16” toe in. Go fast, go straight! Be safe!
@@KevinWilsonSBC Sorry, missed it. 🤟🏻
@@KevinWilsonSBC i have irs pontiac gto have zero camber but to get zero camber i am stuck with .5mm toe out on my rh rear wheel. How much will this affect me?
Lh side is 0.0 dead straight for toe.
Thanks great video I just came across it, what is you theory on setting the rake up on IRS car, run it level or slightly down in front compared to rear?
I always prefer to start near level and see how the car responds. Go fast, go straight! Be SAFE!
I 60 in 1:25 1:3 w stock irs and 700hp on 2020 Supra on all factory suspension foot breaking
I got a 406 nitros in a c3 stock IRS with poly bushings and van steel strut rods and gymkana rear leaf with one extra leaf.. th400 with ATD brake and 390 rear 4500 stall... just got 90/10 calverts with 2" extentions up front... and qa1 Double adjustable in back. Cars 3klbs. I never hook I just spin. What would you recommend as a starting point for setting the qa1s? Oh I run 275/60/15 MT et-R
Unless they are the QA1 MOD series, I would highly recommend a shock more valved for IRS suspensions... The latest video of the Hellcat I posted shows the Menscer shocks on all 4 corners and it is night and day difference. Checkout ruclips.net/video/0fOdZGehSZ4/видео.html
I would also recommend stronger valved shocks up front, especially with a Radial setup. Viking makes a "tie-down" valving that is good and will not break the bank. Go fast, go straight! Be SAFE!
@Kevin Wilson I soaked the tires with wd40 and with the qa1s set 6 compression and 8 extension it will hook now hard. I can't believe the difference. Thanks. No these are the made for a c3 $300 each QA1TD403
Love your videos just found them again I'm subscribed but can't find you lol.
Camaro Drag Racing Second Generation thanks so much for your comments! Not sure why you cannot find me. Please make sure you are still subscribed. I am hearing being getting disconnected and I don't know why. Thanks for supporting my channel!! Go fast, go straight! Be Safe!!
@@KevinWilsonSBC
Wish us racers could help set up people's cars online by watching videos of their cars I try helping many fellow racers no charge because i love the sport and want too see people go fast it took me 8 years too get my car too hook up because everything everyone said was the opposite of what they told me it was like they did it on purpose because they didn't want someone too go fast their is a bunch of secrets people would be surprised what it really takes too make a car go fast.
@@keysautorepair6038 I try my best to help everyone, especially with the videos. I am overwhelmed with emails asking for help, but I try to read everyone of them and offer some assistance. My main goal for the videos is to pay it back. So many have invested in me and I love our drag racing sport. I felt it best to invest back and do everything possible to help the grassroot racers that don't have sponsors or the ability to have new promod chassis' built each year. One thing that frustrates me are the racers who refuse to share or help others. Unfortunately, you can ask 10 racers and get 20 different opinions which has many people chasing rabbits, getting frustrating and parking their cars. Any ways, sounds like you agree and I appreciate you taking the time to comment and support the channel. My 76 year old is absolutely blown away with all this "youtube" stuff. The video content I have captured with him is absolutely priceless. Just being able to watch him on video and hear his voice is gold to me. I cherish everyday with him. My 19 year old son is starting to like "going fast" so this should be fun. Sorry for rambling, just felt like sharing some. Go fast, go straight! Be SAFE!!!!!
You mentioned Delrin bushings, but what about Aluminum or Polyeurethane? I read on garageistic that Delrin doesn't return to shape and if used in a car that features sharp impacts (like drift cars was their example) it may be better to go Poly (especially 80a hardness) for a more street oriented car or Aluminum for a more race oriented one.
@drunken Hamster Thank-you for responding! I am so glad you posted this, as I definitely prefer the aluminum bushings for full race for sure. We HAVE had good success with delrin (Made in the USA) bushings, but, as you stated, the aluminum bushings are the best for full race setup. I meant to include this when I recorded the video, but I just flat out forgot to discuss the roller bearing design. I meant to update the video description with this oversight, and now I will. Go fast, go straight! Be SAFE!
KevinWilsonSBC
@@KevinWilsonSBC I was about to say you said nothing about the poly bushings, but then I checked the description after you mentioned that, too. Thanks for the response, and same to you on the "drive fast, be safe" part! :)
@@Drunken_Hamster keeping me on my toes... LOL. Have a good night!
Awsome im here im here
Bey Tek thanks so much for your comments! Go fast, go straight! Be Safe!!
Now if someone can figure out how to do a trans lock for the hp70 and hp90 we would be set.
How do you calculate the instant center and antisquat on an IRS setup ?
For IRS I dont bother with that. With solid parts and strong arms it will separate and good shock valving. Go fast, go straight! Be SAFE!!
First 6 minutes, you didn't say anything
Why would u think anyone cares about some dude buying a 4 link? WTF does that have to do with anything? No one cares bro they came here for IRS tuning smh.