315s Up Front?
Launching!
Joined: Dec 2005
Posts: 294
Likes: 2
From: AR (PA born and fled)
Nope.
Some rubbing under max cornering with a wide square Hoosier? Yes (but none at all with the rounder Kumho 710).
Major rubbing? No.
Nope again.
Many, many very fast (read: winning) ASP ZO6 drivers are running 315s on all four corners.
In fact, my old set of 17x11s are on a local Z16 car.
Some rubbing under max cornering with a wide square Hoosier? Yes (but none at all with the rounder Kumho 710).
Major rubbing? No.
Many, many very fast (read: winning) ASP ZO6 drivers are running 315s on all four corners.
In fact, my old set of 17x11s are on a local Z16 car.
Last edited by SSNISTR; May 24, 2008 at 10:40 AM.
Well it looks like I'll probably just stick with the 275's up front, except I plan on swapping the Firestones for Nitto 555RII's. The whole reason why I even thought about running such a big tire up front is that I have recently gotten more into auto-x and road course and I saw a lot of serious guys running big tires all around. As for as pressure goes, I generally run 35psi in the fronts and 22 in the rears on the street. What is a good tire pressure to run in this set for track use?
Launching!
Joined: Dec 2005
Posts: 294
Likes: 2
From: AR (PA born and fled)
You said the staggered set up is better. You said the ZO6 has stagggered tire sizes for a reason. Is it your contention that all those national champs and trophy winners would be faster if they went back to a stock size front?
You're also comparing mid engine and rear engine cars to front engine cars.
You may not be aware of this but mid engine / rear engine cars have, as a percentage of the whole, much more weight on the rear tires. Therefore they need the staggered tire dimensions.
But yes, you are correct on one point. The reason we run a matching large tire up front is more grip. Because, you know, more grip will allow the car to corner harder.
To the OP, if you want to be competitive and the class allows it, 315s all the way around are an absolute necessity. If you only want to have some occasional fun, they're not needed. They're also useless for the street.
Last edited by Ironhead; May 24, 2008 at 08:47 AM.
12 Second Club
Joined: Sep 2005
Posts: 4,273
Likes: 0
From: Bucks County, Pa.
Oh silly us. And here we thought all along that our bigger tires made our cars corner harder. I guess timers and data loggers do lie.
You said the staggered set up is better. You said the ZO6 has stagggered tire sizes for a reason. Is it your contention that all those national champs and trophy winners would be faster if they went back to a stock size front?
You're also comparing mid engine and rear engine cars to front engine cars.
You may not be aware of this but mid engine / rear engine cars have, as a percentage of the whole, much more weight on the rear tires. Therefore they need the staggered tire dimensions.
But yes, you are correct on one point. The reason we run a matching large tire up front is more grip. Because, you know, more grip will allow the car to corner harder.
To the OP, if you want to be competitive and the class allows it, 315s all the way around are an absolute necessity. If you only want to have some occasional fun, they're not needed. They're also useless for the street.
You said the staggered set up is better. You said the ZO6 has stagggered tire sizes for a reason. Is it your contention that all those national champs and trophy winners would be faster if they went back to a stock size front?
You're also comparing mid engine and rear engine cars to front engine cars.
You may not be aware of this but mid engine / rear engine cars have, as a percentage of the whole, much more weight on the rear tires. Therefore they need the staggered tire dimensions.
But yes, you are correct on one point. The reason we run a matching large tire up front is more grip. Because, you know, more grip will allow the car to corner harder.
To the OP, if you want to be competitive and the class allows it, 315s all the way around are an absolute necessity. If you only want to have some occasional fun, they're not needed. They're also useless for the street.
Beat me to the response!!
The other point is that even though the front engined Z06 and ZR1 use a staggered setup in street trim, they are still MUCH CLOSER to a 50/50weight distribution than ANY stock configuration f body could EVER hope to be!!
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TECH Fanatic
Joined: Dec 2005
Posts: 1,799
Likes: 1
From: USS Enterprise 1701
alot of guys have no real reason to put those on...they just do it because they want to be different and not understand the consequences of it nor the applications that bigger tires on the front are used for...
just like the kids asking about 335s on the rear of a stock ls1...yes, that should be your first mod
, or "dubs" on an f-body
there are alot of other things involved with cornering then tires...and should be address also before anyone moves to that tire size...
as a note i realize what the OP stated...but my comments are for the everyday person
Everything has its Pros / Cons! 
I'm sure we all keep our rpm below 2000, and drive at or below the speed limit to lessen the amount of wear on our cars drivetrain, along with running soft stock height springs and going around corners or curves at 10 mph or less to minimize wear on the Tires, Suspension, Brakes an hubs! ...........
FYI, If you're worried about wearing parts out don't drive your car, or better yet sell it so somebody can enjoy driving it........
Just do what floats your boat!
I'm sure we all keep our rpm below 2000, and drive at or below the speed limit to lessen the amount of wear on our cars drivetrain, along with running soft stock height springs and going around corners or curves at 10 mph or less to minimize wear on the Tires, Suspension, Brakes an hubs! ........... FYI, If you're worried about wearing parts out don't drive your car, or better yet sell it so somebody can enjoy driving it........
Just do what floats your boat!
To keep it direct, and out of the e-peen measureing that seems to be going on here.
For autox the 315's will be the biggest improvement you can make after quality shocks. There are negitives to the use of 315's, the wear on the front hubs is greatly increased, and the PS fluid heat goes up.
On the street 315's on the front suck. They tram-line(follow the ruts and crown of the road) to the point if feeling uncontrolable on truck traveled roads. The general strain on the front end parts goes way up. Also your paint will really take a beating.
In road racing the benifit really becomes track dependant. If they can be kept up to temp then they can help, but some have improved lap times by dropping to a smaller width and keeping the tires in their grip range, and lowering unsprung weight.
That being said I run a 315 tire in the front when autoxing and drop to a 275 for street use. And AFS makes a 17x11 rim for the older c4 vette that has the correct offset to run in the front of an F-body, or you can run the GS vette offset and a spacer. It is also allways a good idea to upgrade to the ARP lug studs esp if you are using any spacers.
I have found that all the street 315's and the kumo and nitto 's will go lock-to-lock without rubbing. The hoosier 315 is allmost 1/2 in wider and has some minor rub. Ride height make little difference in the front, atleast for me, but I run GW upper control arms that change the camber curve.
For autox the 315's will be the biggest improvement you can make after quality shocks. There are negitives to the use of 315's, the wear on the front hubs is greatly increased, and the PS fluid heat goes up.
On the street 315's on the front suck. They tram-line(follow the ruts and crown of the road) to the point if feeling uncontrolable on truck traveled roads. The general strain on the front end parts goes way up. Also your paint will really take a beating.
In road racing the benifit really becomes track dependant. If they can be kept up to temp then they can help, but some have improved lap times by dropping to a smaller width and keeping the tires in their grip range, and lowering unsprung weight.
That being said I run a 315 tire in the front when autoxing and drop to a 275 for street use. And AFS makes a 17x11 rim for the older c4 vette that has the correct offset to run in the front of an F-body, or you can run the GS vette offset and a spacer. It is also allways a good idea to upgrade to the ARP lug studs esp if you are using any spacers.
I have found that all the street 315's and the kumo and nitto 's will go lock-to-lock without rubbing. The hoosier 315 is allmost 1/2 in wider and has some minor rub. Ride height make little difference in the front, atleast for me, but I run GW upper control arms that change the camber curve.
instead of all this pissing and moaning why dont we just go by what the car will be used for, straight line, or auto x. i think i depends on that more than anything. like ironhead said itd be pointless on the street. but for auto x its been proven over and over again that that wide of a tire up front helps handling. i say we get sam strano in here and see what he runs up front, that may help settle this..
Strano definitely runs the 315 Hoosier slick up front; that's mostly where I got the idea. For the street however, I will definitely stick to the 275's up front. I am planning on putting the Nitto 555RIIs up there. Are these good tires for street handling? Car is only an occasional weekend driver and almost never sees rain. If there is a better all around set for dry street traction, what would it be? I already have the 555R DRs in back so I figured I would just put the other Nittos up front to save $ and keep the same tire compound all around.