Loose when coming off power
Thread Starter
Advanced
Joined: Oct 2007
Posts: 86
Likes: 2
From: Covington, La
Loose when coming off power
Whenever I'm accelerating and I release the gas, my 81' gets loose. I really can't tell if coming from the front or rear end, almost feels like middle body. I've already changed the rear spring, all 4 shocks, rear bushing and torque everything. The car had the same feel prior to all this work.
Could it be a motor mount? Something with the transmission? Rear end? Universal joints?
Need a little direction, may be someone has had a simular problem.
Thanks
Could it be a motor mount? Something with the transmission? Rear end? Universal joints?
Need a little direction, may be someone has had a simular problem.
Thanks
Race Director
Joined: Feb 1999
Posts: 19,659
Likes: 34
From: Lenoir City Tennessee
Ci 6, 8 & 10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15
Have you checked the bushings in the trailing arms? Check the bushing on the diff mount. Are all the shims in place on the trailing arms? Just throwing a few things out there to check. Maybe some others have some more ideas on what to check.
Burning Brakes
Joined: Dec 2003
Posts: 1,004
Likes: 7
From: Adelaide South Australia
Have you checked your wheel alignment...
and don't forget to have the rear checked properly too.
I had a lot of wander at speed.... to the point that I was ready to get rid of my vert.... and all it was, was a proper wheel alignment by an old hand.... someone who actually understood about suspension.
Made a huge difference.
Then a new set of tyres made it feel as good as a new car.
and don't forget to have the rear checked properly too.
I had a lot of wander at speed.... to the point that I was ready to get rid of my vert.... and all it was, was a proper wheel alignment by an old hand.... someone who actually understood about suspension.
Made a huge difference.
Then a new set of tyres made it feel as good as a new car.
Drifting
Joined: Nov 2007
Posts: 1,716
Likes: 278
From: New York
When you say
Whenever I'm accelerating and I release the gas, my 81' gets loose.
Are you talking about going into a turn? Trailing Throttle over steer happens when you lift in a turn.
If your going straight, check the rea end alignment and see if you have toe OUT. If you do, that might also be an issue. Run a bit of toe-IN. Guldstands site has recommend alignment specs.
Whenever I'm accelerating and I release the gas, my 81' gets loose.
Are you talking about going into a turn? Trailing Throttle over steer happens when you lift in a turn.
If your going straight, check the rea end alignment and see if you have toe OUT. If you do, that might also be an issue. Run a bit of toe-IN. Guldstands site has recommend alignment specs.
Le Mans Master
Joined: Apr 2007
Posts: 7,353
Likes: 72
From: Graceland in a Not Correctly Restored Stingray
Vital queston there. In case this is the issue...
TTO is a trait not uncommon among sports cars which are more neutrally balanced than typical road going vehicles. Suddenly lifting off the throttle while in a turn shifts additional weight from the rear to the front, which then has more grip than the back end. At this point, the balance heads towards oversteer from whatever balance the car has. If that balance is normally neutral during cornering, then the back end wants to come around when the weight transfers forward.
Of oversteer and understeer, while it isn't conducive to the best handling, it's best to be a touch on the understeer side of neutral on the street. Better to give up a little handling than to spin out every time some moron screws up and forces you to lift. The fix? Beyond making certain your alignment is correct and you have no mechanical issues, should the problem persist you have some options: 1) if you have a rear bar, reduce its diameter or get rid of it altogether (the C3 does not require a rear bar for proper balance, even on the race track), 2) softer rear spring, or 3) increase the diameter of your front bar (last resort, since that reduces overall grip).
Last edited by TheSkunkWorks; Dec 10, 2007 at 05:44 AM.
Thread Starter
Advanced
Joined: Oct 2007
Posts: 86
Likes: 2
From: Covington, La
I check every day and I thought this tread was dead, just a little more information. When coming off torque, in a straight line, in gets loose.
I live in the Metro Houston area and I'm looking for someone to give it a good alginment.
The car has a Gymkanna system with a 7/16" rear sway bar.
Hope it's only a alginment.
Thanks again,
Kade
I live in the Metro Houston area and I'm looking for someone to give it a good alginment.
The car has a Gymkanna system with a 7/16" rear sway bar.
Hope it's only a alginment.
Thanks again,
Kade
Racer
Joined: Jun 2007
Posts: 294
Likes: 0
From: Nanty Glo PA
I had started a similar thread started about a day before yours.
My 76 has the exact same problem. If I accelerate hard in a straight line and get the speed up then lift quickly off the gas my car pulls rather noticeably to the right. If I get right back on the gas it goes away. I got lots of good advice, unfortunately I can't act on most of it because of the crappy weather here in PA. Winter has finally set in so it'll be like 4-5 mos. before I can sort the problem out. This is the link to my thread:
http://forums.corvetteforum.com/show....php?t=1878893
Maybe you can get some ideas from my thread if you aren't already watching it. HTH
My 76 has the exact same problem. If I accelerate hard in a straight line and get the speed up then lift quickly off the gas my car pulls rather noticeably to the right. If I get right back on the gas it goes away. I got lots of good advice, unfortunately I can't act on most of it because of the crappy weather here in PA. Winter has finally set in so it'll be like 4-5 mos. before I can sort the problem out. This is the link to my thread:
http://forums.corvetteforum.com/show....php?t=1878893
Maybe you can get some ideas from my thread if you aren't already watching it. HTH
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Le Mans Master
Joined: Aug 2000
Posts: 6,362
Likes: 7
From: Brazos TX
Cruise-In IV Veteran
Cruise-In V Veteran
Recent experience on my Vette proved to be a bad trailing arm bushing. I had similar symptoms although mine would turn slightly in both conditions. On the gas hard it would go one way, off the gas abruptly and it would go the other direction when tested in a straight line. It was a handful to drive on the track. I would check the condition of the front T/A bushings, the rear wheel bearings, strut rod bushings and the alignment. The most important alignment spec on the rear is the toe setting. That can easily be checked at home with a tape measure.
