Hey guys ive been noticing lately with my car when it pulls 3 then 4th gear and when boost kicks in the car starts to feel unstable and start to shake left and right and with my steering too i left my foot off then go WOT again and does it a little bit then get stable again! it very weird as if some1 is shaking the car and wobbling it left and right! does get very scary! what do you guys think this is? is it a suspension bushings or control arms! just want to know as maybe this has happend to you guys before i take it to the dealer!

Thanks,

Naji

 

Have you checked your tire pressures? Or alignment?

 

tyres are about 40PSI rears, and 34PSI at the front! filled with nitrogen should i add more to them... alignment was done 2 months back will go get it checked again i guess, but seriously get scary un stable when boost kicks in feels loose... thanks for the info!!

 

Raise her up and let a tech look underneath

 

I am new to porsche and haven't owned mine for 2 months yet. But the symptoms You are describing are that of faulty rear trailing arm bushings. My M3 felt squirrely like yours under WOT. so if the 997 has RTABs, it would be the first place i would look. Bring it to a suspension shop to get them to look at it.

 

Do you have after market suspension? My car did the same thing when I bought it. I have the techart coil overs which I'm told are the same as the pss10's. The sway bar attatchment points were broken. One was cracked and the other was broken off. I had new parts milled out of steel rather than the week aluminum they are made of and that fixed it.

 

Also check the wheel balances.

 

your LSD sounds shot.
if the car is going left and right on full throttle, your limited slip isn't limiting slip

 

+1 on the LSD. Many 996TT's do this as well and people don't notice it much.

 

^ damn dude i frickin LOVE your 993

 

I thought the turbo's in US did not come with an LSD? Was that an option on your car?

Following this thread to see what the cause was.

 

its an option for the 997's. the units are not ideal for most of us (given the power we produce). the factory lsd tends to wear out very quickly. (theres a thread on here from a gt3 guy that toasted his in 1 track day).

upgrades available are Guards or Cup car lsd's. This is one of the best mods for the buck that many members overlook.

 

this is a quote (from the thread i was talking about) from matt

"I think that's a very important point because the other thing I have been seeing recently said about how our LSD's (and Porsche's) work are that the preload in them causes the car to push and makes it hard to turn. This is one of the most ridiculous things I have ever heard. As Mike has indicated (as well as I have seen on other threads around here) when the factory POS LSD wears out the car gets super loose and wags it's tail all over the place. Being tail happy and oversteering has always been the achilles heel of the 911 and even though they've made great strides in recent years with respect to suspension and moving the heavy stuff more towards the center, with an open differential a 911 is still a car that has a tendency towards snap oversteer.

and here's the thread for the curious minds like myself,

https://www.6speedonline.com/forums/...sd-buster.html

 

But guys the car doesnt over steers, and it doesnt do it at lower speeds at all its just when i got above 160KM/H... it also doesnt happen all the time to me usually it happens when the car is still cool but when it heats up it goes away and its fine! its really weird i will take it for service this upcoming week and ill tell them to check it. The worst thing is that my warranty just finished a month ago lol, which is my bad luck! i really hope its a tyre pressure inssue or alignment or anything that has to do with bushings! because when it start to just wobble left and right its just like when you go on the steering left and right with ur own hands, except this one doest it by itself, and nothin with the traction blinking or such thing! im really confused... because car runs perfect in terms of power and acceleration. and my suspension is bone stock guys didnt touch anything on the car!!

 

First place i would look is the balance and then go to the suspension, usually when a car shacks at boost the balance is off... Does it happen all the time the boost kicks in?