My car is pulling pretty damn good to the left upon hard acceleration...say 5-8K rpm. The more power, the more pull. When I let off the gas, the car sits back down in front and wants to go right. WTF is causing this? Is the rear toe out of whack? Ideas? I am taking it in next week for an alignment, but would like any ideas of things I should also have looked at. TIA, Tim

P.S. When in cruise mode, or coasting, there is no pull. All tire pressures are fine and equal (rear 35, front 33). I even toyed with different pressures (up a few, down a few), but to no avail.

 

Anything loose in the suspension?

 

my car willl lunge left with quick full throttle and hih RPM. It always feels like torque to me. Might check for loose sway bar?

When the toe goes out the cars feels like it is searching. Almost as if it is in a rut in the road.

 

Check to make one tire is not more worn than the others. But it does sounds like an alignment issue.

 

Both rear tires are new......car does "hunt" too. I know the front toe needs to be a little more in for my taste---just curious why the rear would want to move so much...I was thinking toe.

 

Needs alignment, and repeat after me.

REAR TOE LINKS.

Also check to see if your Diff is ok.

 

My car does the same thing. This is the rear toe changing when pushed with lots of power. On the track, I have to keep this in mind to get the car going in the right direction. It's not alignment because my car behaved this way before and after alignment. It's the rear toe links flexing because of rubber bushings. I just had the cup car solid toe links installed and there is a significant improvement in this behavior. There do not seem to be any other side affects, so I'm not sure why the factory used these (softer) rubber bushings. My guess is that there are other rubber bushings in the rear suspension that need to be replaced to completely eliminate this behavior. Porsche Motorsports says that the rear toe links are the 1st thing that should be replaced when the gt3 is prepared for the track.

 

When my diff broke (2,000 miles) I had a similar problem. The LSD on the street Porsches is pretty weak.

Rear toe out of specs makes for a nervous rear end, but not the problem you describe. The problem you described also relates to mismatched rear tire pressures, or uneven diameters.

Check the alignment anyway, get a print out before and after.

You're right. It's necessary to replace the upper toe link as well with a solid mount piece (ERP/Cross/AP). There are 5 links on the rear 986/996/987/997 suspension. Two of them are extremely toe sensitive (you have worked out one), three of them camber sensitive with a minor impact on toe.

 

Well said, I agree, the supension/toe links should be corrected to rid these problems.

When my toe/alignment is off it drifts all over the place at speed 100mph+, the wind will make it change lanes, makes for a nervous ride, I have to keep correcting the steering on the long straights just to keep it in the same lane, that's not fun. It makes me wonder how someone could go 190mph in this car

In that video with the GT3 and the enzo the GT3 speed was over 300km/h and it was very stable, how did that happen?

I had lost air pressure on my right rear, under full throtle it would pull hard to the right and when I let off it felt as if someone had hip checked the rear to the left.

 

This has actualy come up before. Check this out and note the comments about tires if this is a recent phenomena.
https://rennlist.com/forums/showthre...ght=squat+left

 

Thanks for all thie info guys. Here is what happened.....I am now thinking TIRES.

I had the car aligned on a Thursday. I picked up the car and it felt great. No issues...straight, no pull to the left on accel...car was very nice.

That night, I got a screw in my LR tire and it went flat, fast. I noticed the car was pulling like a Mac truck to the right and KNEW the tire was going down as our cars are so damn sensitive to pressure changes, etc. I took the next exit, put air in it, and babied it home another mile or so.

I ordered two new rear PS2. One came and one was lost. When I got hte new one, I had it mounted and balanced. I decided to slap the new tire on the LR and go to the store. The car pulled so hard to the left on accel..I was amazed and figured it to be the differential in tire diameter. I parked the car and waited for the new tire to be found...a few days later, it arrived and I installed it.

That is when I noticed the problem I am describing. It pulled no where nearly as bad as it did when I had the new LR and old RR tire, but it was still pretty noticable and is a fricken handful....not something I want to deal with at all. I want it fixed.....NOW.

I wonder if it is possible that I got an oddball PS2? Maybe the left is a bit larger in diameter than the right one. Like I said, BOTH are brand new. Hell, the old one only had about 4K on it and was not too noticably worn...but these cars are sensitive. I would be amazed to find out that two NEW tires could be different enough to cause this problem. Nonetheless, I am going to have it realigned just to make sure...if that doesnt work, I will contact the Tire Rack and go from there. I think I will first measure the diameter of both tires and look for any differences too.

The car NEVER did this before...it was always an arrow, even at 140+. I did have my guy align it to the "ring specs" (something like that) and figured that MAY be the reason...too little rear toe in. I know that is why the car is hunting...too little toe in on the front (for my taste).

I will report back with the initial alignment specs, but being as the car was perfect leaving there, and all I did was basically drove home, I doubt the alignment is the issue (for the pulling).

Thanks for all the info....I hope it isnt a tire issue. I am heading to the track on 3/31 and this will take time...

BTW, I was supposed to go to the track that FRIDAY, the day after the alignment.....but I got that flat! I hope I dont get screwed again... Tim

P.S. -- I am going to swap LR and RR tonight and see if the problem changes...maybe it will pull to the right? LOL. That will rule out tires! God, i hope it is an alignment issue. that would be so much easier to solve.

 

Had this exact same problem with some michelin tires. Try switching the rear tires and it should pull to the opposite side. You can get a warranty from Michelin. I will no longer buy Michelin tires after this problem and another radial hop problem on their tires.

 

TrackJunkie -- I will try that!

How did you handle the situation? Should I call Tire Rack and tell them I have an oddball? That I was two tires from the same lot this time? I am curious how I should proceed if I do find it to be a tire issue. TIA!

 

Several years ago I had a very similar problem. New Goodyear tires. Turned out one tire was "crooked" The Goodyear dealer said he could correct the problem with alignment. I refused his idea and he finally replaced the offending tire. Problem immediately went away. Because of his attitude I will never buy Goodyear again.

 

Go to a Michelin tire dealer. They should contact michelin and get it taken care of.