mtn 3

When I accelerate hard and then lift the car jerks to the left, anybody have any ideas what is causing this??

roberga

CHECK THE DIF

Agena

check tire pressures, loose suspension bits like sway bars, alignment?

///Mous3

How do one "check" the DIF?

datax

1- Lift the car up so that both rear wheels are off the ground.
2- Turn one wheel to clock-wise or ant-clock wise.
3- Check whether the other wheel do the same.
4- Humm....I forgot the rest of the trick. Use the search button.

Can someone fill me in here? Thanks.

jwalton

Most likely Tire pressure issues. Had the same problem. Go back to manufacture specs on tire pressure. sometimes just a few pounds difference can be the cause. Jon in Delaware

930man

pm dell i think he had simular issue last year

Greygt3

Have you recently replaced a rear set of tires, or maybe a single rear tire? If so they must be done in pairs with the exact same circumference or this will cause a pull that changes with on/off gas situations.

mtn 3

2nd how does one check the dif. on the car? it has been aligned and corner balanced and this has not solved the problem.

Tire pressure was checked and off a bit but should tire pressure be cause this big of a problem? I am can't drive now due to snow.

roberga

Get rear wheels off the ground. By hand turn a wheel the other should move. There is a guideline for the amount of torque which will let you know. If you have solid track time on the car the friction plates will wear. There are a few options: rebuild, replace with Porsche part($3,444) replace with other Guard, Quaife. Both are must less for the part. The feedback I got was Autocross=Q: track=Guard.

mtn 3

Oops forgot to refresh before that last post. Car is new to me so unsure on tire replacements. It has 14k miles on it when I picked it up. Noticed the pull on the way home. Dealer has been great as they noticed same problem prior and aligned and corner balanced. They also said that tire pressure was off. They said car was handling well, prior to me picking up. I live in the mountains so test driving this time of year is tough. I check pressure once I got home and had 32 up front and 42 rear. I knew this was off but front to rear not side to side so did not think it could be a problem.
Sort of new to rennlist so not sure who or how to pm dell, thanks for the help I am nervous about this problem, but dealer say they will fix just can't do much now since weather and snow are here for the next 6 months!
Thanks guys

mtn 3

What does the feedback part mean? Is this search function?
Thanks for your help, this is my main fear that something is wrong in the dif as all else in suspesion should be adjustable to fix.

roberga

Talking with the indy shops in Seattle area and the dealer lead tech. They have rebuilt of replaced most to the difs in Seattle area. The autocrossers tend to go with the Quiafe(sp?) trackers with Guard. Most of the ALMS and Rolex teams use Guard. The delta between rebuild and new was small enough for me to go with new. Guard is about $2,400 for the part. It is way better than the Porsche part and $1,000 less. Also, you can not get a 996 dif only 997. I think the lock was changed due to the assist. I am sure there are people on the board that have a better understanding of this. I do know that with the new Guard lap times will drop. I was glad to have mine go. Provided a reason to make the plunge. Also, since the trany is out you might as well get the LWFW :-). All that said I do not know if the dif would push your car to the left. I was just guessing that maybe without a functioning LSD power to both wheels would not be controlled

mtn 3

Good thoughts but god I hope you are wrong just spent some serious cash buying this thing!

Crazy Canuck

I had this problem last year. One of my rear tires was toed out.