19" rims affect 1/4 times?

[xsteclipse6902]

I was wondering if 19 inch rims affect your 1/4 time at all. I noticed someone posted below saying that "i have 19 inch rims so i will probably run high 15's instead of low 15's". Do they affect your 1/4 time?

PS: Sorry if this is in the wrong forum....Feel free to move it

 

[Revenant]

Do 19" rims affect 1/4 times?

Yes they do.

 

[Venum]

More rim, more wieght. You can figure out how much more area 19's have than 15's by using the good ol' A=ðr²
BUT besides that 19's slow the rotation or your wheels down a bit too.

IMO getting an extra .2 seconds in the quarter mile is not worth having 15's instead of 19's, when you go to the track just swtich em there. OR if you want to sell your 19's to me that'd be sweet too

 

[jefferino]

With my old setup I ran 12.9 not tuned rollin on 18s with old a$$ crappy tires to give you an idea that it doent matter that much. BTW it is much more fun to see the look on people's faces when a car rollin on 18s can break into the 12s

 

[Rice Over Wheat]

I believe all weights being equal, the larger the rim the greater the top end but you lose some acceleration off a launch. Conversely, the smaller the rim the faster the launch but less top end.

I generally hear that 17s are the best compromise for wheel size. If you go 18 then pay for quality low weight wheels to make up for the increase in diameter.

This is conjecture, but I'd think that a FWD with some power would benefit from larger wheels off a launch because of wheelspin.

ROW

 

[Bullitt]

"I believe all weights being equal, the larger the rim the greater the top end but you lose some acceleration off a launch. Conversely, the smaller the rim the faster the launch but less top end."

Mind explaining this?

 

[2gGSX]

im assuming its because of inertia/rotational force, but i'm probably very wrong

 

[BOMEX DSM]

18s 19s will make you slower in the quarter for various reasons, first of all u see that its been posted running a 12.9 on 18s well thats on a GSX you being 2wd fwd for that matter will suffer alot more. First the case of weight has been brough up already but the less sidewall the less traction a 35 series sidewall will get less traction than a 50 series tire. Ive read this numberous times so i tought i would share. Hope that was of some help as far as rotational mass being better off the line cause its heavier i dont know about that one.

 

[xsteclipse6902]

So what would the second difference be in the 1/4??? My goal is low 13's with 19 inch rims. Would it be alot harder with 19 inch rims?

 

[DOHCSIDE BOOST]

that was me that said i probably hit high 15's. The previous owner of the car hit 15.1. I will be going to the track tonight with my 19's on and ill let you know how i ran.

 

[jefferino]

I definitely agree about the sidewall debate. My friends that were at the track said that when I was going down the quarter I was all over the place. My car was dancing all over because of crappy traction on 40 series tires and not much room to let out air to lower pressure and attempt to increase traction.

Oh yeah and the whole AWD thing helps alot too!

 

[jmc94gsx]

Second that:

Tire pressure
The tire's sidewall

 

[Rice Over Wheat]

Originally posted by Bullitt
Mind explaining this?

I was talking top end as in top speed...straight line on a highway for example. Let's say your car had two sets of wheels, one 16" and the other 18", and both sets weighed the same. Equivelent sized tires on both sets.

At the absolute top end of your car's final gear, each rotation of the wheels would travel a greater distance than the 16s. Your RPMs should redline __ mph faster than when with 16s. Wheel weights being equal, the engine should have to work about the same effort for each revolution. The smaller wheels will require more revolutions to travel the same distance as the larger wheels, therefore losing top end when limited by redline in 5th.

I'm no physics major...anyone tested top end with conditions like these?

ROW

 

[DOHCSIDE BOOST]

15.7 with the 19's, previous owner 15.1 with 18's. take off felt awesome, but you can see the higher rpm's climbing so slowely. there was a stock gs-t with slicks running 14.3. well atleast he said it was stock.

 

[ITSME4G63]

Depends on the weight of the wheel.

 

[xsteclipse6902]

Holy Shit.......So they take almost a second off ur times??? I just ordered some 19's. Thats not good

 

[Cesar]

Ever watch top fuel dragsters? have you ever seen their tires flex?
The tires absorb alot of the driveline shock. Bigger wheels are not really intended for drag racing. Go light, small diameter, wide, and lots of tire.Launch harder, keep your axles

 

[xsteclipse6902]

Alright but with 19's can i still take the stock civic or stock gti v6 that revs on me at the light????????

 

[onepimpclipse]

Just get light weight rims and a 225/35 tire and you'll be fine. It will affect you a little, not that much though. Plenty of guys run 19's.


Here's a good thread about 19's.


http://dsmtuners.com/forums/showthread.php?s=&threadid=91122

 

[WillWrk4Boost]

hmmm lil shady on ROW's explanation (I know what your saying) but have you ever track tested this idea???




Devon

 

[ProjectTwin]

Originally posted by Rice Over Wheat
I was talking top end as in top speed...straight line on a highway for example. Let's say your car had two sets of wheels, one 16" and the other 18", and both sets weighed the same. Equivelent sized tires on both sets.

At the absolute top end of your car's final gear, each rotation of the wheels would travel a greater distance than the 16s. Your RPMs should redline __ mph faster than when with 16s. Wheel weights being equal, the engine should have to work about the same effort for each revolution. The smaller wheels will require more revolutions to travel the same distance as the larger wheels, therefore losing top end when limited by redline in 5th.

I'm no physics major...anyone tested top end with conditions like these?

ROW

Close but no cigar.

The diameter of the wheel doesn't make a difference on distance traveled over a rotation...it's the circumference of the tire that matters.

To get the circumference of the tire, measure the diameter of the tire and multiply by 3.14.

The tire with the larger circumference will travel the farthest distance in one rotation.

You can actually get a larger diameter wheel and put a tire on it that will give you a nearly identical ride height (same circumference) as the stock wheel/tire combo.

The drawback is you have less sidewall and heavier wheels.

 

[DOHCSIDE BOOST]

i still spanked a base rsx, bout 5 car lengths. so yeah youll takeout those civics and vw's

 

[DSMNightmare]

It's not only the physical weight that is going to slow you down but also the rotational mass, combined with the additional friction surface of the wider rims. Most 19s are wider than a standard 17" wheel.

 

[fasteclipse1992]

if your tire/ rim combintation is the same weight wether they are 14" to 19" it dont matter if the tires are of the same diameter. smaller diameter will give you quicker acceleration, larger diameter tires will give u higher top end. the tires are the determinating factor.

 

[Bullitt]

What i was looking for was why the smaller rim/tire will give you better acceleration, whether it was due simply to less rotational mass, or if it had something to do with the actual size of the tire. I guess i'm still a little confused on the smaller rim/tire part but thanks for the upper end explanation ROW. Is this the same reason that a smaller rim/tire combo will give you better acceleration?
It would seem that although your RPMs are increasing quicker with a smaller combo, that doesnt necessarily mean your speed is increasing quicker as well with the smaller combo as well. I know theres a reason why i'm wrong, and i know i'm wrong, i just can't figure out why.

And for those of you arguing about 19's, holy crap. Get an SUV or something and put some 22's on if it you want big rims. Then, you can just put a rubber strip around the rim and roll around with a 10 sidewall and call it good.