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TPI Torque, makes car twist?

nelson84

Well-known member
Joined
Aug 28, 2006
Messages
829
Location
Canada
Corvette
84 Z51 two tone bronze coupe 85 black on black
Is it normal for an 85 vette to twist on the highway after you hit the gas?
I was doing about 65 mph and hit the gas and the car twisted.
 

muddywaters

Well-known member
Joined
Aug 25, 2002
Messages
765
Location
wilkes-barre,pa.usa
Corvette
1988 white 4+3 coupe 99 Torch Red 6spd. coupe
Hi Nelson, There is alot of flex/twist with the C4's, was the roof panel off? I notice the flex when I pull in or out of my drive way, but never on the highway...........
 

KANE

Moderator
Joined
Mar 2, 2002
Messages
3,244
Location
KY
Corvette
Dark Blue 1982 Trans Am(s): Polo Green 1995 MN6
Is it normal for an 85 vette to twist on the highway after you hit the gas?
I was doing about 65 mph and hit the gas and the car twisted.

Sounds more like a rear end problem. Sometmes, when the differential's clutches are worn out- the car will feel as though its twisting when in reality it is slipping on one side.

Pull it up on jacks, in neutral, and attempt to turn the rear wheels forward and backward. If you can get a wheel to turn forward or backward (a quarter to half turn or so) loosely before the diferential engages- there's your probem.

I had a C3 that did that. It would slip under intial acceleration and deceleration.
 
S

speedmaster4

Guest
car designer's biggest pita = people...people want to have lots of elbow room, ez get in and out, don't like structural members penetrating their body...plus its gotta be fast(light weight)...soooo, it ends up with a powerful engine in a steel cage with minimal elements all in the least obtrusive, and unfortunately least functional, places.

of course these problems apply to all designs, and every design group must decide how much rigidity is required...EVERY car flexes to some degree.

yeah, c4's flex.
 

ZumZum

Well-known member
Joined
Mar 25, 2004
Messages
478
Location
Central Illinois
Corvette
1988 Dark Red Coupe
Also check to make sure you don't have a broken motor mount. That will sure make it feel like the car is about to twist in half.

'Course, your TPI unit might crack to hood if that was the case.
 

nelson84

Well-known member
Joined
Aug 28, 2006
Messages
829
Location
Canada
Corvette
84 Z51 two tone bronze coupe 85 black on black
It is just a slight twist, I was watching the corner of the hood above the wheel on the drivers side and it lifts a bit, I think it is cool.
 

WaveDoggie

Active member
Joined
Apr 25, 2005
Messages
29
Location
Oregon
Corvette
'95 Coupe
Grab a rear wheel and pull it side to side like you are 'steering' it. if it moves ANY amount, you have worn bushings and/or wheel bearings. The car should accelerate straight and true on level ground when you tromp on the gas-wheelspin notwithstanding:). Antother clue is if it tramlines on rutted/uneven roads. The car should feel steady and stable, if not I suggest MOOG suspension products.
 

Radar

Well-known member
Joined
Oct 23, 2001
Messages
200
Location
Oconomowoc, WI
Corvette
1989 Medium Blue Metalic Convertible
I have the 89 vert and I have a little cowl shake when driving rough roads with the top down. But no twist that I can detect when I really get on it.

I know the convertibles have a cross brace but I would not think that you should be able to detect any twist in acar while driving. I would look at the chassis closely to see if something is broken.

Regards and good luck!

Radar :)
 

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