I was at 140 mph the other day & very stable. 
Best mod for stability at high speed?
Thread Starter
Burning Brakes
Joined: Aug 2005
Posts: 796
Likes: 0
From: Crapachusetts MA
Best mod for stability at high speed?
Seems like anything over 100 and my vette gets a bit unstable, kind of feels like the front tires are coming up off the ground, if that makes sense. I have brand new tires, Goodyear F1's, although they are the stock 17 in front and 18 in rear, and I do miss having 18's all around like my old car. Is it an issue of the wheel size, or is there any other mod for high speed stability?
Instructor
Joined: May 2005
Posts: 229
Likes: 0
From: "Second place is just the first loser" Edmond, Oklahoma
Originally Posted by robz
Get a good alignment and make sure the rake on your car is correct. BSM are supposed to help also.
i can hit 140 in 3rd and feel glued to the highway..... was it windy when you were 'experimenting'?craig in windy OKC
ps- I also have Z06 wheels and non EMTs
Instructor
Joined: May 2005
Posts: 229
Likes: 0
From: "Second place is just the first loser" Edmond, Oklahoma
Try lowering your front end a little also if you haven't already.... it's easy. But I'm a BIg believer in balanced and aligned tires.... that's the place to start.
Race Director
Joined: May 2004
Posts: 16,667
Likes: 1,209
From: Raleigh, NC
St. Jude Donor '15
mine's lowered damn near to the ground on coilovers and had just had an alignment when i tried to go real fast. it rides/drives/handles pretty terrible all the time, i guess 175K miles has its disadvantages 
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Safety Car
Joined: Jul 2005
Posts: 4,275
Likes: 4
From: Vancouver WA
It could be your tires! My Goodyear EMT's always had a hard time staying straight on uneven roads. Went to Pilot Sports and the problem went away. I think it's because the GY don't have much of any radius on the endges.
Last edited by RED99; Aug 29, 2005 at 11:19 PM.
Le Mans Master
Joined: Dec 2003
Posts: 5,561
Likes: 448
From: Atlanta metro Ga.
Make sure you've retained the front to rear rake.. If not, the front end may be lifting at high speeds. The rear should be at least 1/2" higher than the front when measured at the factory specified points. In general, make sure the car is not "flat", nor the rear lower than the front.
My car is perfectly stable at 150 MPH.
My car is perfectly stable at 150 MPH.
Drifting
Joined: Sep 2004
Posts: 1,727
Likes: 20
From: Carson City, NV
I just ran mine at the track at speeds routinely between 80 and 130 and it felt very stable. Get a good 4-wheel alignment and some non-EMT tires like Michelin Pilot Sports (check air pressure - 32 to 35lbs).
John
John
Supporting Tuner
Joined: Sep 2004
Posts: 51,896
Likes: 39
From: ================== Houston, Texas www.englandgreen.com ================== Necessary Evil™ __________
CI 6-7-8-9-10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14
I have stock (and now worn) runcraps, my car is slammed and it's rock solid all the way to 155mph (closed course, professional driver naturally 
)
Tire pressure (30psi cold), and a solid Z06 specs alignment on all 4 wheels makes it very stable. I do NOT have front/rear rake - my car is level (see pic).
EG
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)Tire pressure (30psi cold), and a solid Z06 specs alignment on all 4 wheels makes it very stable. I do NOT have front/rear rake - my car is level (see pic).
EG
Team Owner
Joined: Jul 1999
Posts: 50,808
Likes: 10
From: Buy USA products! Check the label! Employ Americans
First how many miles on your car? If the car is 100% stock and in good shape it should feel great at 175 mph. If things are worn it will not feel good. Check tie rod ends and ball joints. Then do the alignment and rake setup which is very important.
Burning Brakes
Joined: Feb 2004
Posts: 831
Likes: 0
From: Poland oh
Before I got the MCM hood I couldn't get over 150 with out the car getting squirrly. Felt like alot of front end lift. 2 weeks ago I had it at 160 and it was very responsive. Not much road left to push it any higher. With the A4 and 3.42 rear I think 170 is acheivable espescially with the hood on now.
Safety Car
Joined: Jul 2001
Posts: 4,661
Likes: 67
From: Ocean Springs MS
Originally Posted by schpenxel
mine's lowered damn near to the ground on coilovers and had just had an alignment when i tried to go real fast. it rides/drives/handles pretty terrible all the time, i guess 175K miles has its disadvantages