Auto X suspension
Thread Starter
2nd Gear
Joined: Oct 2007
Posts: 2
Likes: 0
Auto X suspension
I have just purchased a 94` Vette to Auto X with.
The car is completely stock. Tires are the
Goodyear GSC`s loaded on the OEM wheels.
The problem: I am experiencing lots of
oversteer through out the entire turn (entry, apex
and exit). Very very loose. What can I do to settle
the car down and plant the rear of car better?
I`m running the car currently in the SK1\AS class
Thank you, Barry B.
The car is completely stock. Tires are the
Goodyear GSC`s loaded on the OEM wheels.
The problem: I am experiencing lots of
oversteer through out the entire turn (entry, apex
and exit). Very very loose. What can I do to settle
the car down and plant the rear of car better?
I`m running the car currently in the SK1\AS class
Thank you, Barry B.
Race Director
Joined: Feb 2003
Posts: 11,672
Likes: 20
From: Lake Wylie SC
I went with a set of 11" ZR1 sawblade rims and Victor Racer tires on the rear and that helped stop the rear from trying to get ahead of the front.
Go to the auto cross and road course racing section and you'll find all kinds of suggestions.
Go to the auto cross and road course racing section and you'll find all kinds of suggestions.
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
There is lots of infomation here that can help you sort the car out. In the Autocross and Road Racing section, use the search function, entering words like oversteer, shocks, suspension, and such to find specific threads where car set-up is discussed. Are you intending to stay in a stock class? That may limit you to what you can do to the car. Check your sanctioning body's rules first.
I would first find another set of tires. The GS-C is not a good autocross tire at all. The GS-C is not made any more and the chances are that your tires have lost all of the compounds that originally gave them performance capability. That's probably why the car is so loose.
If you want a good street/autocross tire that doesn't cost a lot, look at the Kumho Escta MX. This is an excellent dry weather high performance street tire that will work fine if you aren't allowed to run a "race" tire in your class.
Race tires are great but you need a way to get them to the event. I personally wouldn't run race tires on the street. As above, search for "heat cycles" in that section to get information on that.
Le Mans Master
Joined: Dec 2002
Posts: 5,270
Likes: 3
From: Seattle Area WA
:i agree:
Grab some better tires first. Then see, you might also want to take your foot off the gas too...
If it still has big issues, then get it custom aligned (Vette Brakes and Products) has specs on their website as a jumping off point. And also inspect your suspension. How are the bushings? Shocks? Your sway bars should be connected but who knows, check anyway.
Everyone at this point will tell you, you need more seat time.
But if you wanted to do something, and you are staying AS (I assume this is like the SCCA class?), then you will be limited but some Koni adjustables (Yellows), polygraphite bushings would be my next bet after tires to help make the car a bit more predictible. The guys in AutoX/RR will take care of you.
Grab some better tires first. Then see, you might also want to take your foot off the gas too...
If it still has big issues, then get it custom aligned (Vette Brakes and Products) has specs on their website as a jumping off point. And also inspect your suspension. How are the bushings? Shocks? Your sway bars should be connected but who knows, check anyway.
Everyone at this point will tell you, you need more seat time.
But if you wanted to do something, and you are staying AS (I assume this is like the SCCA class?), then you will be limited but some Koni adjustables (Yellows), polygraphite bushings would be my next bet after tires to help make the car a bit more predictible. The guys in AutoX/RR will take care of you.
Team Owner
Joined: Mar 2001
Posts: 30,856
Likes: 293
From: Boston, Dallas, Detroit, SoCal, back to Boston MA
A completely stock C4 that's loose at an autocross??? 
I'd like to know how you managed that one.
Seriously, C4's are know to be plough pigs.
What's your alignments?
What's your tire and rim sizing?
I'd like to know how you managed that one.
Seriously, C4's are know to be plough pigs.
What's your alignments?
What's your tire and rim sizing?
Race Director
Joined: Feb 2003
Posts: 11,672
Likes: 20
From: Lake Wylie SC
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