Reducing rolling resistance?
TECH Regular
Joined: May 2012
Posts: 442
Likes: 0
If I moved from a 28" tire to a 29" would I slow down in the 1/8?
Sorry didn't mean to hijack...
TECH Enthusiast
Joined: Nov 2013
Posts: 629
Likes: 1
From: upstate ny
Plz chime in if anyone has solid proof as I to would like to gain a solid tenth or two 
Last edited by ironmikektm525; Mar 6, 2017 at 07:43 PM.
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
I gained .01 going from chrome 17s with 275s to a racestar 17x9.5 and 17x4.5 combo. No weight saved in the back (same tire and size) and the front skinny had a nice radial and total weight savings was 20lbs (racestars are kinda heavy). I compared track slips. Needless to say I sold the racestars and went back to chrome wheels.
TECH Enthusiast
Joined: Nov 2013
Posts: 629
Likes: 1
From: upstate ny
I gained .01 going from chrome 17s with 275s to a racestar 17x9.5 and 17x4.5 combo. No weight saved in the back (same tire and size) and the front skinny had a nice radial and total weight savings was 20lbs (racestars are kinda heavy). I compared track slips. Needless to say I sold the racestars and went back to chrome wheels.
TECH Regular
Joined: Aug 2003
Posts: 453
Likes: 0
I was thinking of changing up my wheel/tire setup to a lighter setup. After Doing a bunch of research I've come to the conclusion they don't make a big difference in 1/4 times like people think. Hot rod magazine or car craft (can't remember) did a wheel weight 1/4 test and the results were surprising. If I remember correctly it was less then a tenth.
Maybe for road racing that involves braking, etc it will help overall performance.
Of course, like all internet myths, it has spread so much that it is currently a fact. I actually saw one guy claim it was a 10X difference. The power of the interwebs......
Al
TECH Enthusiast
Joined: Nov 2013
Posts: 629
Likes: 1
From: upstate ny
Yes, this is true. Much to some people's dismay, reducing unsprung weight is not 2X or 3X better than reducing the weight off the body for drag racing.
Maybe for road racing that involves braking, etc it will help overall performance.
Of course, like all internet myths, it has spread so much that it is currently a fact. I actually saw one guy claim it was a 10X difference. The power of the interwebs......
Al
Maybe for road racing that involves braking, etc it will help overall performance.
Of course, like all internet myths, it has spread so much that it is currently a fact. I actually saw one guy claim it was a 10X difference. The power of the interwebs......
Al
Last edited by ironmikektm525; Mar 11, 2017 at 05:20 PM.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
What if you were told there's people that hang actual weight on the rear end housing increasing unsprung weight, with positive results?
Weight on the rear end housing.... doesn't care what the suspension doesnits holding the rear tires on the track regardless....... food for thought.
Weight on the rear end housing.... doesn't care what the suspension doesnits holding the rear tires on the track regardless....... food for thought.
What if you were told there's people that hang actual weight on the rear end housing increasing unsprung weight, with positive results?
Weight on the rear end housing.... doesn't care what the suspension doesnits holding the rear tires on the track regardless....... food for thought.
Weight on the rear end housing.... doesn't care what the suspension doesnits holding the rear tires on the track regardless....... food for thought.
that is very interesting to me...any pics or links to ways this is being done ? is there a good/safe low budget DIY type way to do this ?
I took my bolt on A4 car to the track once on a street night and traction was difficult to find with people running treaded tires through the water , I started out with 12.5's on 1.9 60 foots , removed front sway and got into 1.8's then track got worse and went 1.9/2.0's threw my iron floor jack and toolbox that weighed about 75# in the trunkwell ended up with 12.1 PB with a good 150# over stock car weight and that was with a fuel pump on its way out missing over 5500 . Without the added weight in the back I never would have gotten bottom 12's
edit: your making me think about bigger rear ends having a benefit to factor in the whole equation s60/9" etc... beyond the added losses from turning beefier internals and overall weight if it helps keep tires planted it may not all be negative with the added weight...
Last edited by murphinator; Mar 12, 2017 at 11:23 AM.
TECH Regular
Joined: Dec 2014
Posts: 484
Likes: 18
From: Emory Texas currently
that is very interesting to me...any pics or links to ways this is being done ? is there a good/safe low budget DIY type way to do this ?
I took my bolt on A4 car to the track once on a street night and traction was difficult to find with people running treaded tires through the water , I started out with 12.5's on 1.9 60 foots , removed front sway and got into 1.8's then track got worse and went 1.9/2.0's threw my iron floor jack and toolbox that weighed about 75# in the trunkwell ended up with 12.1 PB with a good 150# over stock car weight and that was with a fuel pump on its way out missing over 5500 . Without the added weight in the back I never would have gotten bottom 12's
edit: your making me think about bigger rear ends having a benefit to factor in the whole equation s60/9" etc... beyond the added losses from turning beefier internals and overall weight if it helps keep tires planted it may not all be negative with the added weight...
I took my bolt on A4 car to the track once on a street night and traction was difficult to find with people running treaded tires through the water , I started out with 12.5's on 1.9 60 foots , removed front sway and got into 1.8's then track got worse and went 1.9/2.0's threw my iron floor jack and toolbox that weighed about 75# in the trunkwell ended up with 12.1 PB with a good 150# over stock car weight and that was with a fuel pump on its way out missing over 5500 . Without the added weight in the back I never would have gotten bottom 12's
edit: your making me think about bigger rear ends having a benefit to factor in the whole equation s60/9" etc... beyond the added losses from turning beefier internals and overall weight if it helps keep tires planted it may not all be negative with the added weight...
Weight pucks mounted like a set of wheelie bars.
Sometimes thinking out of the box will get results.... if your car is light for a class and you dont wanna disturb it.... this works very very well contrary to what most will tell you.
Sometimes thinking out of the box will get results.... if your car is light for a class and you dont wanna disturb it.... this works very very well contrary to what most will tell you.