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Old 08-08-2012, 05:48 PM   #1
Bavaryan
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DSC over sensitive-left hand turns only, steering angle calibration?

During left hand sweepers(on ramps, off ramps etc), DSC will kick on when it shouldn't. It is well before the car is actually sliding, and it seems to engage one of the rear brakes.

It does not do this during right hand sweepers/corners.

The problem started when I put on new tires on the rear(continental DWS), front has michelin A/S plus(bad choice for rears I know, but i'm living with it now). With DSC turned off there is tons of grip, and it will actually understeer rather than oversteer with the current tire setup, even though the sidewall is softer in the rear.

I'd think this is just my own dumb fault for not taking the advice given to not mix and match this particular combo of tires, but that does not explain the right hand vs left hand turn difference. Tire pressures are equal left and right.

Thoughts?
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Old 08-08-2012, 05:54 PM   #2
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My car did the exact same thing when I put on brand new V12s on the rears. only in one direction as well while i'm WELL within the limits of traction. i think the outside front wheel was braking on left sweepers. i think this has to do with the car having an open diff and basically losing traction due to the slippery nature of the new tires and release mold compound. I read others having the same problem too with new rear tires. i put about 500 miles on the new rears and haven't really experienced the DSC going off again... I think you'll be fine.
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Old 08-08-2012, 06:01 PM   #3
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If it needs to be re-calibrated, I believe almost all modern alignment machines have the ability to do this. If not, your dealer will need to do this for you. I'd imagine it's a standard $100-150. Check with indy shops first.

Your tire also needs to be broken in, which takes about 500 miles. This number corresponds with what Mango said, too.

Did you get an alignment when you got new tires?
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Old 08-08-2012, 06:21 PM   #4
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Tires have well over the 500 mile break in period. During the break in period driving the car was down right terrible.

I also had to put the rear tires up to about 46psi cold in order to make the car driveable without feeling like the rear end was floating. I'm not sure if that will impact the DSC, traction at the limit is fine and better than the old A/S pluses without DSC on.

The only other thought I have is that the car *thinks* the rear is starting to step out because the sidewall is flexing, but again, turning one way vs the other should not impact that.
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Old 08-08-2012, 06:26 PM   #5
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Just wait a while. i think you'll be fine. new tires will be mush mush in comparison with old tires just because they're meatier/have more tread.
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Old 08-08-2012, 09:10 PM   #6
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Not to mention heat cycling them will harden em up......just seemed odd that it does it one way and not the other. Oh well I'll just turn it off when I want to play, have to be more cautious as I won't have dsc as my safety net when playing though.
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Old 09-05-2012, 01:28 AM   #7
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Did your issue ever get resolved? I just replaced the rears in my ZHP today and am experiencing the same phenomena except with me it's right-handers.
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Old 09-05-2012, 01:32 AM   #8
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When was the last time you all had an alignment? What condition are your RTAB's in?

46psi is NOT a healthy tire pressure. Its far too high and you will be giving up grip, not to mention putting excessive wear on the center of your tires. The best traction is usually somewhere around 37psi, but it varies alot.
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Old 09-05-2012, 02:06 AM   #9
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I had the same exact problem. It completely went away with new tires.I had NEW rear tires for two weeks and pretty bald front tires. When I finally got the NEW front tires... DSC intervention on left turns went away commpletely. DSC is very hard to induce now

It's simply the difference in rotational speed of the new tires on the rear axle versus the front or vise versa. It must be right at the limit of the parameters where it detects a difference.
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Old 09-06-2012, 08:50 PM   #10
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Alignment fixed it. Rear camber and toe were out. Car drives like its on rails now, and is a blast on the turnpike again! However to others reading this, don't forget to let the tires get broken in before panicking.
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