same size tire all 4 corners
Thread Starter
Le Mans Master
Joined: Aug 2013
Posts: 5,969
Likes: 1,410
same size tire all 4 corners
Hey everyone,
Was curious if anyone knows how the C5 handles when you run the same tire on all 4 corners.
The way its set up stock suggests that it would push in corners due to a smaller footprint in the front and wider in the rear. However, the springrate suggests that gm stiffened the rear to help the *** end slide out more in a turn (a component of weight transfer due to roll stiffness)
So what's the dealio?
Was curious if anyone knows how the C5 handles when you run the same tire on all 4 corners.
The way its set up stock suggests that it would push in corners due to a smaller footprint in the front and wider in the rear. However, the springrate suggests that gm stiffened the rear to help the *** end slide out more in a turn (a component of weight transfer due to roll stiffness)
So what's the dealio?
Safety Car
Joined: Jul 2004
Posts: 3,904
Likes: 29
From: Vancouver Washington
You will definitely have to turn the traction control off or you won't get far. I ran a set of Pirelli Trofeos in a square set up the first time, 295/30/18s and I expected the tail to get a little happy, but it didn't happen. The car turned in better and the tail was as solid as ever. Since then I've run a set of Hoosier square with the same result - better handling. If I go back to my standard Toyo 888s it's going to be a 315/30 square set up. I am running a track alignment and heavier bars.
Thread Starter
Le Mans Master
Joined: Aug 2013
Posts: 5,969
Likes: 1,410
TC? Who uses TC anyways? Isn't TC supposed to be the driver? 
Negate the effects of the tc... What about the actual handling dynamics of the car. Its a 50/50 weight distrobution but front and rear have different roll stiffnesses. Now put the same rubbers on... What's that give you.
I'm not a fan of staggered. Thanks for the experience post about your different rubber setups. I have the z51 suspension parts and looking at bilstein or z06 shocks to help out a bit. Might go up on the sway bar stiffness too...
Negate the effects of the tc... What about the actual handling dynamics of the car. Its a 50/50 weight distrobution but front and rear have different roll stiffnesses. Now put the same rubbers on... What's that give you.
I'm not a fan of staggered. Thanks for the experience post about your different rubber setups. I have the z51 suspension parts and looking at bilstein or z06 shocks to help out a bit. Might go up on the sway bar stiffness too...
Instructor
Joined: Jul 2011
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From: bay area CA
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Thread Starter
Le Mans Master
Joined: Aug 2013
Posts: 5,969
Likes: 1,410
That would be great thank you.
I have the z51 package on the C5. Been thinking about upgrading sway bars to a z51 C6...or z06 C6... Difference is the z06 has a stiffer rear and same front.
Typically that would cause the *** end to come out more when its stiffer. Maybe due to the z06 having wider rears to compensate?
I have the z51 package on the C5. Been thinking about upgrading sway bars to a z51 C6...or z06 C6... Difference is the z06 has a stiffer rear and same front.
Typically that would cause the *** end to come out more when its stiffer. Maybe due to the z06 having wider rears to compensate?
Race Director
Joined: May 2012
Posts: 15,756
Likes: 3,276
From: Phoenix area, AZ
That would be great thank you.
I have the z51 package on the C5. Been thinking about upgrading sway bars to a z51 C6...or z06 C6... Difference is the z06 has a stiffer rear and same front.
Typically that would cause the *** end to come out more when its stiffer. Maybe due to the z06 having wider rears to compensate?
I have the z51 package on the C5. Been thinking about upgrading sway bars to a z51 C6...or z06 C6... Difference is the z06 has a stiffer rear and same front.
Typically that would cause the *** end to come out more when its stiffer. Maybe due to the z06 having wider rears to compensate?
Drifting
Joined: Jun 2009
Posts: 1,305
Likes: 8
From: Chester Springs PA
on the street it's likely that the only thing you will notice is that the front end tends to "hunt" over grooves more. on the track running square makes the car more neutral by taking out some understeer. I have run 295/35, 305/35, 315/30 on track all with similar overall effect. I have never had an issue with TC/AH. some do some don't. not sure why. mine is a '03z.
Drifting
Joined: Jun 2009
Posts: 1,305
Likes: 8
From: Chester Springs PA
I personally am running c6 z51 bars. the stock bars were rusted at the bushings when I bought my car so I bought these. it was before I started tracking the car more seriously, I am likely going to put T1 bars on soon.
this is the general opinion I've picked up in the roadracing forum and my experience is similiar ... regardless of which sways you have, if you leave everything else the same and just go square tire setup, the extra grip in the front tends to reduce the understeer in the car. a stock c5z off the showroom understeers a bit, most stock street cars do .. its a safer set up. The car feels very neutral and predictable with 315/30's at all 4 corners on 4 18"x10.5" stock rear wheels. Again, I don't think you can push the car enough on the street to really notice it.
this is the general opinion I've picked up in the roadracing forum and my experience is similiar ... regardless of which sways you have, if you leave everything else the same and just go square tire setup, the extra grip in the front tends to reduce the understeer in the car. a stock c5z off the showroom understeers a bit, most stock street cars do .. its a safer set up. The car feels very neutral and predictable with 315/30's at all 4 corners on 4 18"x10.5" stock rear wheels. Again, I don't think you can push the car enough on the street to really notice it.
Thread Starter
Le Mans Master
Joined: Aug 2013
Posts: 5,969
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That is very good information I do really appreciate that. Off the floor they always understeer due to being easier for the average cusotmer to recover when loosing control.
What springs are you running in your setup? They would make a difference in sway choice and keeping balance. I just want to make sure I'm not wasting my $ and time if someone else has the same experience.
It sounds like the c6 z51 are better than the z06 bars for keeping balance I may just go that route like you did. So that would be z51 springs from c5 and z51 for sways out of a c6.... Then run 305 on all 4.
Hopefully would keep it neutral and handle great. What shocks are you running to keep damping under control?
What springs are you running in your setup? They would make a difference in sway choice and keeping balance. I just want to make sure I'm not wasting my $ and time if someone else has the same experience.
It sounds like the c6 z51 are better than the z06 bars for keeping balance I may just go that route like you did. So that would be z51 springs from c5 and z51 for sways out of a c6.... Then run 305 on all 4.
Hopefully would keep it neutral and handle great. What shocks are you running to keep damping under control?
Thread Starter
Le Mans Master
Joined: Aug 2013
Posts: 5,969
Likes: 1,410
Those the full metal ones?
I really appreciate the help you guys. I promise ill give back as much as I'm getting with this forum!!
Z06 or bilsteins? I've heard good things about them.
Rd... If your upgrading to T1... Wana sell ur old sways? Send me a pm sir.
I really appreciate the help you guys. I promise ill give back as much as I'm getting with this forum!!
Z06 or bilsteins? I've heard good things about them.
Rd... If your upgrading to T1... Wana sell ur old sways? Send me a pm sir.
Safety Car
Joined: Jul 2004
Posts: 3,904
Likes: 29
From: Vancouver Washington
Put the tires on first, see how it handles, then buy different sways only if you need them. Don't fix problems you only think you might have. I run Hotchkiss bars with the rears set on the outside holes making it less stiff than stock C5Z bars. The cars handling is totally neutral. Track set up is a slow one item at a time process. Good luck and have fun.