hesperus

my RT12 (which as you know basically has a 996 TT drivetrain) has started to pull slightly to the left under hard acceleration in 2nd and 3rd gear.

its just for a split second-- only come in just as the boost comes in-- and then its gone. but its enough to have to be conscious of it and be ready to keep the car straight as the power kicks in.

once past that initial kick, everything is normal. tracks straight, brakes straight, no problem at high speed.

have reproduced the symptoms several times, always on perfectly dry, clean, flat, straight roads. tire pressures are all normal, so my guess is its the wheel alignment, which i'm having checked very soon.

any other ideas what this could be?

Macster

Not Torque steer.

Something else.

Torque steer arises from under equal iength drive/half shafts on front wheel drive vehicles. Unequal length drive/half shafts for rear wheel.

AFAIK the half shafts the Turbos are equal lengths.

What do the tires like? Feel like? Any signs of feathering, cupping?

Alignment is worth checking but at the same time have the tech check motor mounts, transmission mounts, and all drive train bushings/mounts.

My WAG is one or more mounts is bad (loose or cracked or broken) and the a portion of the drive train is twisting under hard acceleration.

Sincerely,

Macster.

hesperus

you're right of course. my bad, i should have said FEELS like torque steer, as it reminds me of the tug on the steering wheel from an overpowered FWD car. thanks for pointing that out!

will check closely when I have the alignment done.

good point. a friend of mine suggested just this earlier tonight-- that it could be a bad bushing or something, causing uneven twist, as you've described.

will have a look and report back! again, thanks!

osunick

Actually not true. You can also get torque steer with a strut front suspension because the steering axis can't be through the center of the wheel/tire assembly. Because of this, there is a levering effect on the kingpins. The reason why the Macan/VAG front suspension is so complex- the four control arms with ball joints create a virtual kingpin that goes right through the center of the tire/contact patch. Therefore any torque applied can't affect the steering. With the rear biased 997 system, torque steer isn't a big issue, whereas some of the moderate horsepower FWD Audis in the euro market need this suspension to eliminate torque steer.

512bb

I would say this can result from a few things, but I would look at:

1) Alignment
2) While checking alignment make sure there are no looks or worn suspension parts
3) Worn limited slip differential(s)

Let us know what you find out and good luck.

saabin

Being a four year old thread I would think the OP has fixed it by now..

512bb

That's OK, I am an addict of the forums............ LOL

TT Surgeon

RT12 is a cool car