C8 Track setup / help reduce further reduce understeer
Instructor
Joined: Dec 2021
Posts: 234
Likes: 147
I have to turn everything off because with these tire sizes the computer isn’t happy and intervenes wayyyyy too much
Thread Starter
Heel & Toe
Joined: Aug 2023
Posts: 19
Likes: 3
From: Austin TX
Quick update: I upgraded my wheels and tires to 275/35/18 and 325/30/19 as I wanted to keep the diameters similar to stock for clearance reasons. This significantly reduced the understeer problem and makes the car much more enjoyable to drive. My lap times went down without really pushing the car that hard. I will be installing the MCS 2WNR coilovers in a few weeks. Depending on the results I may install the aFe sway bars but many seem to think that will be unnecessary once the MCS suspension is installed.
On a side note, I also added the GiroDisc rotors, G-Loc R10 brake pads and steel brake lines. This made a big difference, giving much better braking feel and bite which inspires much more confidence on track.
On a side note, I also added the GiroDisc rotors, G-Loc R10 brake pads and steel brake lines. This made a big difference, giving much better braking feel and bite which inspires much more confidence on track.
Burning Brakes
Joined: Sep 2011
Posts: 960
Likes: 40
The understeer of a C8 is due to the suspension pushing against suspension or shock bushings that have give.
One fix is stiffer suspension bushings while another fix is stiffer springs for less suspension bump movement.
Lowering the car on stock springs, resulting in less spring preload, doesn't help.
When fixed, the car will handle more like a race car and could even swing out the rear-end just on too much entry spreed.
For driving style, don't trail brake of course. Well, don't load the front-end with braking on the turn-in. A driver might increase rear-end drift with mid-corner brake action. But with the right amount of entry speed then the driver begins adding a small amount of power at mid-corner. If a lot of power is added at mid-corner then the entry speed was to slow.
One fix is stiffer suspension bushings while another fix is stiffer springs for less suspension bump movement.
Lowering the car on stock springs, resulting in less spring preload, doesn't help.
When fixed, the car will handle more like a race car and could even swing out the rear-end just on too much entry spreed.
For driving style, don't trail brake of course. Well, don't load the front-end with braking on the turn-in. A driver might increase rear-end drift with mid-corner brake action. But with the right amount of entry speed then the driver begins adding a small amount of power at mid-corner. If a lot of power is added at mid-corner then the entry speed was to slow.
Last edited by B Stead; Oct 17, 2023 at 11:01 PM.
Heel & Toe
Joined: Jul 2020
Posts: 18
Likes: 6
Quick update: I upgraded my wheels and tires to 275/35/18 and 325/30/19 as I wanted to keep the diameters similar to stock for clearance reasons. This significantly reduced the understeer problem and makes the car much more enjoyable to drive. My lap times went down without really pushing the car that hard. I will be installing the MCS 2WNR coilovers in a few weeks. Depending on the results I may install the aFe sway bars but many seem to think that will be unnecessary once the MCS suspension is installed.
On a side note, I also added the GiroDisc rotors, G-Loc R10 brake pads and steel brake lines. This made a big difference, giving much better braking feel and bite which inspires much more confidence on track.
On a side note, I also added the GiroDisc rotors, G-Loc R10 brake pads and steel brake lines. This made a big difference, giving much better braking feel and bite which inspires much more confidence on track.
The Continentals are a top notch track tire.
3rd Gear
Joined: Nov 2023
Posts: 3
Likes: 0
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1st Gear
Joined: Dec 2024
Posts: 1
Likes: 0
Sway bars help a lot. I installed a front sway bar to counter the understeer. It made a huge difference! AFE bar set on the lightest setting and running bridgestone RE-71RS size 265 rails corners. The car now likes to oversteer a bit, but that's way more fun! If I wasn't restricted by the SCCA street category rules I would also install the rear sway bar to further dial in the car.
AFE Sway Bars
AFE Sway Bars
Racer
Joined: Apr 2024
Posts: 353
Likes: 180
From: Michigan
