Hi Everyone, thanks so much for watching! As mentioned in the video, we wanted to ensure to clarify a few things about this specific test and the results that we found. Firstly, we all know that Rotational Inertia/Reducing unsprung weight is a big factor in helping a vehicle reduce lap times, increase acceleration and improve braking distance. We know that the science has been proven here and that it's almost always a good idea to reduce weight where possible, when you want to make your vehicle perform better. Here are a couple great videos for more information: ruclips.net/video/CxuER0qIWJk/видео.html&ab_channel=EngineeringExplained ruclips.net/video/SR3nVx1aaTo/видео.html&ab_channel=EngineeringExplained Now that said, we decided to simply put this idea to the test, to the best of our ability, using the winter and summer wheel/tire setups that Josh has for his van. The winter setup is on a 17" wheel and using 235/65/17 tires, whereas the summer setup is using 20" wheels with 255/45/20 tires. There is a drastic weight difference between the two sets, and the summer setup is as much (or more) than 50% heavier. We figured that this would be a very practical way to test Rotational Inertia because most times, when people buy new wheels for their vehicles, they're usually bigger in diameter and wider as well (which usually means heavier too). We performed many runs on both setups, timed them all and and then compared the times between the two, in order to determine of there was a noticeable difference. One big area for improvement here would definitely be the tire types. If we could have had the same tires on both sets of wheels, that would have been ideal, but we were confined to using Winter tires on the 17" wheels and Summer tires for the 20" wheels. So we did notice more wheelspin on the launch with the winter tires than on the summers. However, this also could have been a case of the van not having been able to spin the tires as much on the launch with the summer setup, because of the increase in weight as well. Another reason why we feel that this test works well, is because it's being conducted on a vehicle with not a lot of Horse Power and Torque. The added unsprung weight would likely affect a vehicle with low HP/TQ ratings as opposed to a vehicle with a lot of power. The Odyssey has a power to weight that is similar to many compact cars/passenger vehicles that are commonly on the road today, so even though its V6 puts out more HP and TQ than a lot of those vehicles, the overall power to weight is almost the same on average. Now that our essay is finished, THANK YOU for watching and please let us know your thoughts below. Take care!
A refreshing, practical look at the often searched but rarely illustrated topic. Forgive me if I missed it, but was there a breakdown of the powertrains used in each respective minivan? Unless they've got identical engines AND transmissions, acceleration delta could be explained by them rather than rotational mass difference - or one cancelling the other, leaving us with a cliffhanger...
Thanks for your comment! There was a breakdown of the powertrains in the linked video with the actual drag race between the Odyssey and the Caravan, but not in this specific video - sorry about that! The reason we chose not to include that information was just because we somewhat used the Caravan as a "control" and then used the Odyssey as the test subject, swapping the wheels over. We also timed both vans in the 1/4 mile with each run too which would eliminate any potential error with us driving the vehicles. And that's how we were truly able to tell that there was a very minuscule difference between the two different sets of wheels/tires. I hope that helps to clarify things a bit!! We definitely did try to make this as controlled as possible, although what would make it even more potentially error free, would be to throw the same type of tires on both sets of wheels and then test again!! All that to say, thanks again and have a good one :)
Great idea, we can try that out if we film another video like this. Although once a wheel is already moving, there would be less effort required to spin it more so that’s why we only tested from a stop, as the most amount of energy is required to begin spinning the wheel as opposed to keep it going. That said, a roll test would have definitely been good to try :)
@@KingdomAuto Any decrease in rotation mass will also show up in the roll test as the engine has less effort to put in when acc a smaller/lighter wheel. Would be interesting to see them tested again.
That was a great video! To be more precise, though, could you do something like a 20" summer tire vs a 17" or 18" summer tire? That would really be great for enthusiasts trying to pick the right size for their fast cars.
Thanks for your comment! If we ever have the opportunity to test something like that then sure - however, based on what we saw during this test, the tires really wouldn't make much of a difference in acceleration with the average vehicle (provided the tires have decent life left in them). It only really starts to matter when the vehicle has a lot of power. That said though, if we're ever able to run a test like this again then we'll do our best :)
@@SteveContreras-m1h thanks for your suggestion, we tried that and actually there was no change. Stock settings in auto seem to take it right out to redline and then shift. What really lost the race for the Dodge was 4th gear. 1,2 and 3 it had the Odyssey beat easily but then in 4th it fell on its face. Too tall of a gear
Small light wheels made a difference on my car on acceleration by about O.2secs over quarter mile. But trap speeds when down with smaller tyre by 2km on average. 17inch x7 to 15 inch x 6 wide.
I have a 2018 ram 1500, stock rims are 40lbs each (20” 5 spoke) and about 40lbs of tire so 80 per wheel. I did some research on lighter wheels and tire, trying to from 320lbs of wheel to 250lbs Just want a little more speed
That’s a pretty big difference for sure! You’ll likely notice an improvement in efficiency and it would be interesting to see what you notice when it comes to acceleration for sure
Thanks for your comment, we mentioned that in the video - See the description and pinned comment :) As explained, this test was to practically see if and how much the added weight would affect acceleration :) Cheers!
As wild as it sounds (we had a hard time believing it too) - the summer wheels are almost exactly 50% heavier in this specific case. They're a 20" wheel from Cadillac (CRAZY HEAVY) and they're also 1" wider than the winter's as well. It's a huge difference in weight, which is why we figured that it would be an ideal time to test this concept out :) Cheers!
@@automotivetv9861 No worries at all! It is hard to believe that the two sets of wheels could be that different in weight, we didn't realize it till we pulled the info on them, crazy eh?
Yes you mentioned that on the other video of the Odyssey Vs Caravan Race and we responded; the Odyssey wins that race. We ran it but didn’t film because we were too busy filming two videos at the same time. That said, the Odyssey won the roller race when we did it
That’s quite the specific task, didn’t realize this upload would come with a homework assignment haha. Our conclusion can be heard at the end of the video, hope that helps :)
Hi Everyone, thanks so much for watching!
As mentioned in the video, we wanted to ensure to clarify a few things about this specific test and the results that we found.
Firstly, we all know that Rotational Inertia/Reducing unsprung weight is a big factor in helping a vehicle reduce lap times, increase acceleration and improve braking distance. We know that the science has been proven here and that it's almost always a good idea to reduce weight where possible, when you want to make your vehicle perform better.
Here are a couple great videos for more information:
ruclips.net/video/CxuER0qIWJk/видео.html&ab_channel=EngineeringExplained
ruclips.net/video/SR3nVx1aaTo/видео.html&ab_channel=EngineeringExplained
Now that said, we decided to simply put this idea to the test, to the best of our ability, using the winter and summer wheel/tire setups that Josh has for his van.
The winter setup is on a 17" wheel and using 235/65/17 tires, whereas the summer setup is using 20" wheels with 255/45/20 tires.
There is a drastic weight difference between the two sets, and the summer setup is as much (or more) than 50% heavier.
We figured that this would be a very practical way to test Rotational Inertia because most times, when people buy new wheels for their vehicles, they're usually bigger in diameter and wider as well (which usually means heavier too).
We performed many runs on both setups, timed them all and and then compared the times between the two, in order to determine of there was a noticeable difference.
One big area for improvement here would definitely be the tire types. If we could have had the same tires on both sets of wheels, that would have been ideal, but we were confined to using Winter tires on the 17" wheels and Summer tires for the 20" wheels.
So we did notice more wheelspin on the launch with the winter tires than on the summers. However, this also could have been a case of the van not having been able to spin the tires as much on the launch with the summer setup, because of the increase in weight as well.
Another reason why we feel that this test works well, is because it's being conducted on a vehicle with not a lot of Horse Power and Torque. The added unsprung weight would likely affect a vehicle with low HP/TQ ratings as opposed to a vehicle with a lot of power.
The Odyssey has a power to weight that is similar to many compact cars/passenger vehicles that are commonly on the road today, so even though its V6 puts out more HP and TQ than a lot of those vehicles, the overall power to weight is almost the same on average.
Now that our essay is finished, THANK YOU for watching and please let us know your thoughts below.
Take care!
That Josh... what a jerk! Racecar deserves more than a splice-in!!
(Josh Speaking) Oh I got an earful from her about that, believe me! I won't be making that mistake again!!! The people HAVE to see Mamzee!! 🤣🤣😁😁
A refreshing, practical look at the often searched but rarely illustrated topic. Forgive me if I missed it, but was there a breakdown of the powertrains used in each respective minivan?
Unless they've got identical engines AND transmissions, acceleration delta could be explained by them rather than rotational mass difference - or one cancelling the other, leaving us with a cliffhanger...
Thanks for your comment!
There was a breakdown of the powertrains in the linked video with the actual drag race between the Odyssey and the Caravan, but not in this specific video - sorry about that!
The reason we chose not to include that information was just because we somewhat used the Caravan as a "control" and then used the Odyssey as the test subject, swapping the wheels over.
We also timed both vans in the 1/4 mile with each run too which would eliminate any potential error with us driving the vehicles. And that's how we were truly able to tell that there was a very minuscule difference between the two different sets of wheels/tires.
I hope that helps to clarify things a bit!! We definitely did try to make this as controlled as possible, although what would make it even more potentially error free, would be to throw the same type of tires on both sets of wheels and then test again!!
All that to say, thanks again and have a good one :)
@@KingdomAuto Thank you so much for the detailed explanation and the video, which now makes perfect sense - and have a good one too ))
@@mereobserver1727 Thank you! :)
I would be interested to see the difference between heavier and lighter tires in fuel economy.
That would be a fun one to test for sure
U should try a roll test, say 30-100mph on both tyres and see the diff.
This will eliminate the issues with the tyre compound.
Great idea, we can try that out if we film another video like this. Although once a wheel is already moving, there would be less effort required to spin it more so that’s why we only tested from a stop, as the most amount of energy is required to begin spinning the wheel as opposed to keep it going. That said, a roll test would have definitely been good to try :)
@@KingdomAuto Any decrease in rotation mass will also show up in the roll test as the engine has less effort to put in when acc a smaller/lighter wheel.
Would be interesting to see them tested again.
That was a great video! To be more precise, though, could you do something like a 20" summer tire vs a 17" or 18" summer tire? That would really be great for enthusiasts trying to pick the right size for their fast cars.
Thanks for your comment! If we ever have the opportunity to test something like that then sure - however, based on what we saw during this test, the tires really wouldn't make much of a difference in acceleration with the average vehicle (provided the tires have decent life left in them). It only really starts to matter when the vehicle has a lot of power. That said though, if we're ever able to run a test like this again then we'll do our best :)
Do the caravan in manuel mode put it on 1st gear and let it ride from there , let it shift on it own ..big difference 💪
@@SteveContreras-m1h thanks for your suggestion, we tried that and actually there was no change. Stock settings in auto seem to take it right out to redline and then shift.
What really lost the race for the Dodge was 4th gear. 1,2 and 3 it had the Odyssey beat easily but then in 4th it fell on its face. Too tall of a gear
Small light wheels made a difference on my car on acceleration by about O.2secs over quarter mile. But trap speeds when down with smaller tyre by 2km on average. 17inch x7 to 15 inch x 6 wide.
Interesting, thanks for sharing!
Haha those wheels on lego car are definitely good for handling 🤣😂
Explain to me like I am 5 years old Mamzee!!! 🤣😂👍
Mamzee's the best! The channel wouldn't be the same without her :)
I have a 2018 ram 1500, stock rims are 40lbs each (20” 5 spoke) and about 40lbs of tire so 80 per wheel.
I did some research on lighter wheels and tire, trying to from 320lbs of wheel to 250lbs
Just want a little more speed
That’s a pretty big difference for sure! You’ll likely notice an improvement in efficiency and it would be interesting to see what you notice when it comes to acceleration for sure
Lighter wheels is for HANDLING!
(Unsprung weight).
Thanks for your comment, we mentioned that in the video - See the description and pinned comment :) As explained, this test was to practically see if and how much the added weight would affect acceleration :)
Cheers!
I doubt the summer wheels are 50% heavier!! Probably only 10% heavier.
As wild as it sounds (we had a hard time believing it too) - the summer wheels are almost exactly 50% heavier in this specific case. They're a 20" wheel from Cadillac (CRAZY HEAVY) and they're also 1" wider than the winter's as well. It's a huge difference in weight, which is why we figured that it would be an ideal time to test this concept out :)
Cheers!
@@KingdomAuto Ohh interesting, my bad
@@automotivetv9861 No worries at all! It is hard to believe that the two sets of wheels could be that different in weight, we didn't realize it till we pulled the info on them, crazy eh?
I would like to see a roll race
Yes you mentioned that on the other video of the Odyssey Vs Caravan Race and we responded; the Odyssey wins that race.
We ran it but didn’t film because we were too busy filming two videos at the same time.
That said, the Odyssey won the roller race when we did it
So what is your conclusion, in words in less than or equal to 2 sentences?
That’s quite the specific task, didn’t realize this upload would come with a homework assignment haha. Our conclusion can be heard at the end of the video, hope that helps :)