Stability Control very sensitive after coilovers installed

[Lunatic]

OK, what about this?

My ABS light and traction control light came on, wouldn't go off. Car drove the same but cruiz control wouldn't work. I took it to the dealer and the reck re-set everything. He asked me if I drove a lot with traction control turned off. I said not normally but I turn everything off when on the track. The reck said if the car ses more than 3 miles of driving it will bring up these codes and go into limp mode. This makes no sense to me.
Thoughts anyone?

[churchx]

First time i've heard that it may cause CEL. And i guess there might be lot of people driving on track if not with pedal dance, then at least with turning aids off with longer traction control press, so it should be noticed/reported years ago. BS?
I know that CEL caused by O2 sensor on decated headers may cause cruise control to not work, but i wouldn't call much of a 'limp' mode, nothing is cut down except CC. But for CEL to be caused by traction control off? :/

[wparsons]

Originally Posted by sittinSideways

I'm chalking this up to VSC just not knowing how to deal with lowered ride height (I still have a 2 finger gap between my tires and fender). I don't see any other explanation, except that maybe the way increased grip from our tires is messing with VSC.

So on that note, what tires and sizes are you guys running? I'm 255/35/18 Dunlop Direzza ZII (super sticky)

VSC doesn't know if the car is lowered, there is no ride height sensor. The yaw sensor might not know what neutral flat is, but I can't imagine it would be THAT far out without a huge amount of rake.

Lowered on swift sport springs, -2* camber all around, 0 front toe, 1/16" rear toe in. 225/45/17 RS3 v2's. Zero issues with VSC being more invasive than normal.

[wparsons]

Originally Posted by ZHoward

this is short video to show i drive on canyon road with my friends, the sounds of VSC , and my speed is really slow when i turn in

Is the slip indicator light coming on when the VSC is kicking in? It doesn't look like it, but I can't tell for sure with the wheel in the way.

How much rear droop travel do you have? Are you running a stiffer rear sway bar?

If the slip indicator isn't coming on, and you have little droop travel, it *could* be the ECU trying to get traction in the rear by braking in the inside tire if it's lifting. I'd say that's a long shot though, especially since you're not going that fast.

[ZHoward]

Originally Posted by wparsons

Is the slip indicator light coming on when the VSC is kicking in? It doesn't look like it, but I can't tell for sure with the wheel in the way.

How much rear droop travel do you have? Are you running a stiffer rear sway bar?

If the slip indicator isn't coming on, and you have little droop travel, it *could* be the ECU trying to get traction in the rear by braking in the inside tire if it's lifting. I'd say that's a long shot though, especially since you're not going that fast.

Yes, it is on, and I drop about 1.5 finger between tires and fender, and my rear sway bar is stiffer


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[jvincent]

Originally Posted by Lunatic

The reck said if the car ses more than 3 miles of driving it will bring up these codes and go into limp mode. This makes no sense to me.
Thoughts anyone?

I've driven many more than 3 miles around a track with traction control on and not gone into limp mode. This is in an MT, so the AT may be different.

I thought I read somewhere that if the AT fluid temp gets too high it goes into limp mode.

[wparsons]

Originally Posted by ZHoward

Yes, it is on, and I drop about 1.5 finger between tires and fender, and my rear sway bar is stiffer


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I would try removing one rear sway bar end link to see if that stops it. If not, it's definitely something funky in the sensors/ecu.

[ZHoward]

Originally Posted by wparsons

I would try removing one rear sway bar end link to see if that stops it. If not, it's definitely something funky in the sensors/ecu.

Maybe I get a adjustable rear end links is better?


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[wparsons]

Originally Posted by ZHoward

Maybe I get a adjustable rear end links is better?


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Not if you're trying to diagnose what's causing the VSC triggering too easily.

Disconnecting one side helps rule out too little droop travel or having that wheel in the air.

[JS + BRZ]

Originally Posted by AZP Installs

On track we turn off the VSC via the buttons, no pedal dance.
On the street we leave the VSC engaged. No issues on the street at all. Along with the 50+ other BRZ/FRSs that we've setup for street use.

Perhaps one needs to look at the height and setup to see why the VSC is acting erratically. It could also have to do with the driving style as well, although I would doubt that highly.

Generally if the car is setup properly and you have a grippy tire setup you will be less likely to trigger the VSC actually.

-mike

On track, I pedal dance, so there's no issue. The car feels fantastic.

On the street for the canyon runs, I always just put the VSC sport mode on. The VSC kicks in when it should kick in. I don't really have an issue.

It's just that it kicks in more often now that with the stiffer coilovers. I mean it makes sense. It's stiffer so the car slides a little more when going over the bumps mid turns.

I have 245/40/17 Hankook RS3s, so my tires are most definitely grippy.

At the end of the day though, the car feels so much better and fun to drive with the coilovers. I feel so much more confident with it too.

[KoolBRZ]

I think you need to unplug and replug your stability control sensors. You can locate them in this PDF, "http://www.ft86club.com/files/BRZwiringi.pdf". The front sensors are labeled A42 LF, A12 RF, for the front, and G9 LR, H12 RR, for the back. You'll find a diagram of locations on page 39 for the fronts, and 44 for the left rear, and 45 for the right rear. One of these connectors was likely dislodged during your recent spring install. Inspect the wires closely because maybe a wire was cut or pinched during the upgrade. It's very unlikely that the VSC controller itself is affected, and much more likely that a sensor or connector was.

From the diagrams, it looks much more likely for the rear speed sensors to have been dislodged, then the front ones. I would suggest checking those first, the VSC is also under the hood next to the LF speed sensor, if that's come loose it will also cause problems.

[AZP Installs]

Originally Posted by Lunatic

OK, what about this?

My ABS light and traction control light came on, wouldn't go off. Car drove the same but cruiz control wouldn't work. I took it to the dealer and the reck re-set everything. He asked me if I drove a lot with traction control turned off. I said not normally but I turn everything off when on the track. The reck said if the car ses more than 3 miles of driving it will bring up these codes and go into limp mode. This makes no sense to me.
Thoughts anyone?

I've racked up about 5000-8000 miles of track time on my car over the past summer. I'm pretty sure that a CEL would have come on as 95% of that time was with TC turned off (non-pedal dance).

-mike

[AZP Installs]

Originally Posted by JS + BRZ

On track, I pedal dance, so there's no issue. The car feels fantastic.

On the street for the canyon runs, I always just put the VSC sport mode on. The VSC kicks in when it should kick in. I don't really have an issue.

It's just that it kicks in more often now that with the stiffer coilovers. I mean it makes sense. It's stiffer so the car slides a little more when going over the bumps mid turns.

I have 245/40/17 Hankook RS3s, so my tires are most definitely grippy.

At the end of the day though, the car feels so much better and fun to drive with the coilovers. I feel so much more confident with it too.

Your car should not be sliding any more over bumps. If it is then you need to raise your height and/or soften the settings on your suspension and/or lower your tire pressures.

-mike

[JS + BRZ]

Originally Posted by AZP Installs

Your car should not be sliding any more over bumps. If it is then you need to raise your height and/or soften the settings on your suspension and/or lower your tire pressures.

-mike

Yeah, my car is set up for the track. Spirited canyon run wasn't the priority. I'm just too lazy to change it up. haha I've gotten used to the VSC sensitivity.

My car isn't that low, especially the back end.