Jim Cobb

I have been driven nuts by a suspension fault that had been coming and going but now doesn’t want to go. I have big $$$ invested in a 3 day DE starting on April 12. I’m curious if anyone has driven on track with this fault showing and how the car’s handling might have been affected, including under hard braking. Since this fault cancels sport mode, I’m also curious about anyone accustomed to the auto throttle blip had to adjust their driving. Many thanks.

Frank 993 C4S

Why would you ever take the risk running a street car with any suspension related fault indication on track? Go to a shop and have the specific fault code evaluated and the root cause identified.

amurph182

As someone who just totaled their car and is incredibly lucky to not be seriously injured because of a mechanical failure on SOMEONE ELSE’s car, please don’t take your car on the track if it has problems. Especially problems of the “I have no idea how the car will respond” variety.

Jim Cobb

I have had it evaluated more times than I can count, at the investment of several grand, and every evaluation has been wrong thus far. I am planning to take it to a dealer service department before the DE, fwiw, but I asked the question in case I couldn't get it fixed in time. I also asked knowing that tracking it would be less than ideal, but I am prepared to do it rather than miss another event that I am already in hock for. IMO, the GT4 is more of a track than "street car" and mine is set up for the track, but you are free to think what you will, of course.

Ubermensch

I go to the track to have fun and hopefully improve my performance. I don't know how I'd do either if I was worried about this kind of issue. My confidence in the car would be low and I'd be concerned about impacting other drivers around me. Get the car to a qualified shop to follow Frank's advice.

Jim Cobb

I asked the question in the first place because I wanted to get a sense of what the consequences of driving on the track might be. If I have the slightest reason to think I might be jeopardizing someone else, I won’t be out there.

amurph182

with respect (seriously) I don’t think most people who end up being “the problem car” on track ever had any intention of doing so.

what is the fault?

Frank 993 C4S

I can give you an example. At the NJMP PCA Club Race in 2023 I ended up with a (wheel speed sensor) fault, that did not allow me to put the car into Sport+ mode. Unbeknownst to me, this also resulted in an ABS fault that caused me to flat spot two front tires in the warmup lap - I immediately returned to the paddock without completing the lap. If I would have continued, I would have probably crashed the car at the start of the race in Turn 1, due to non-availability of the ABS. Just an example.....

To resolve the issue, we changed the wheel speed sensor as indicated by the fault code and the wheel bearing for that wheel, but it turned out to be a faulty wiring harness.

kisik

In engineering we always say: "Don't leave anything unexplained. It will bite you later". I think it applies here as well. Share with the community what might be the problem or symptoms and you will be surprised with answers. Perhaps it will help to point you in the right direction and understand the problem.

Jim Cobb

I hesitated to do this because I have already been on here whining about it a lot of late. But here goes. I have had the above problem, (Fault Code 00133, open circuit at left front shock absorber or stuck valve) for a number of months now. I have replaced the shock to no avail, and we have checked the wiring harness connected to the base of the strut. Historically, the problem has popped up on cold mornings but gone away after driving for 15 mins or so. After it came on and wouldn’t go away, I stuck a light bulb in close to the pasm controller and left it there a few hours. The fault disappeared and stayed away for two weeks regardless of the temps, only to show up again Saturday afternoon, when it was not cool at all. Now, after sticking the bulb back in there for several hours, it has gone away again, temporarlily at least. This makes me suspect the pasm unit, and I plan to have a dealer service department check it out as soon as I can make arrangements to get there. As I said elsewhere, I was trying to get feedback on whether it could be tracked safely from someone who has done it, just in case I can’t get it fixed in time. Thanks for your interest.

Jim Cobb

I suspect the pasm controller first, the wiring harness second in my case. I know the ABS and front suspension are served by the same wiring harness, but never hear of the faults being connected. I have have already tried hard braking at relatively high speed and haven’t detected a problem so far.

ANGST

I know running short on time , but with so many DSC controllers out there, maybe someone on Rennlist has a spare stock PASM unit they never intend to use again. ? Do you have a 981 GT4 ? or a 718 GT4 ?

Kitc2246

Agree it sounds like a PASM controller issue. Suggest taking it to a shop or the dealer with a PIWIS and have them check the system when the car is cold. With the fault how many other systems are effected? Sounds like the car defaults to "Normal" and a softer shock setting. Suspect PADM is also disable to normal. I'd find out how quickly you can get a new PASM controller. I'd think a dealer would replace and easily take it back if it wasn't the real problem. Whether the car is safe to drive at a DE with its known fault is a hard question. The cars handling and your shifting will definitely be effected.

Jim Cobb

Thanks for the suggestion. It’s a 981. That would be great. Honestly, if I knew for sure that controller was the problem I’d try to find a DSC for myself.

Jim Cobb

Going to the dealer is my plan. It’s 90 miles away, so I will have to make arrangements for a ride home unless they have one in stock. The most obvious effect of the fault for me would be losing the auto blip since sport mode would be disabled. Under spirited driving at least, I can’t tell that the handling is affected, but the ride is definitely rougher.