Stability Control very sensitive after coilovers installed
 

I installed my coilovers last week and got everything aligned, but since then, the car's stability control has been very "touchy"; turns I made easily on the Sportline springs I had before now set off the VSC. It shouldn't be the sensor's neutral setting, since it was calibrated to the same ride height on the springs. I'm stumped, anybody have any ideas?

What are your full alignment specs?

Could be alignment related or just the fact that the spring rates have changed quite a bit (stiffer) and your car is sliding more than it was on the springs. What coilovers did you install? With what spring rates?

Possible that you could have damaged an ABS sensor/wire during the install?

If it were ABS sensor related, it would be freaking out even while coasting in a straight line.

What sway bars are on the car?

What coilovers did you install?

What is the ride height?

I wonder if you just don't have enough droop travel and the inside rear is unloading in every turn, the result is lots of intervention from the E-diff/traction control.

which coilovers did you get? do you have some unnecessarily super high spring rate matched to generic dampers (like a lot of the mickeymouse brand sets that come out of taiwan/china)?

My money is on this combined with a lower than necessary ride height.

Also did the OP install rear arms to compensate for the camber adjustments needed?

-mike

They're Feal coilovers with stock spring rates: Swift springs at 7k front, 6k rear.
Dampers set to middle of their range.
Alignment specs:
Front: -1.25 camber, 6.3 caster, 0 toe (previously -0.5 caster)
Rear: -2 camber, 0.01 toe (previously -3 camber)

I don't recall the ride height, but the measurement from floor to fender was within 1/8 inch of the Sportlines at each corner. I'll measure when I get home.

The sways are stock, with adjustable end links to dial out the preload (had been running stock endlinks with the springs, which had ridiculous preload on the bars).

I'm leaning toward it being the increased spring rates in the rear. Going to Sebring on Saturday, so we'll see what the clock says.

It's definitely not the spring rate ratio, stiffer front than rear will make it more understeer prone.

Have you tried playing with the damping?

What tires are you running?

What conditions do you find the VSC intervening more?

It's because you're supposed to reset the VSC sensor when you change the ride height. I'm surprised more people don't know/remember about this. You need Techstream to do this.


NOTICE:

* While obtaining the zero point, keep the vehicle stationary and do not vibrate, tilt, move, or shake it. (Do not start the engine.) * Be sure to perform this procedure on a level surface (with an inclination of less than 1 degree). HINT
When VSC sensor neutral memorization is performed, the yaw rate and acceleration sensor and the steering sensor zero point calibration are performed at the same time.


(1)Turn the ignition switch off.(2)Check that the steering wheel is centered.(3)Check that the shift lever is in neutral.(4)Apply the parking brake by pulling up the parking brake lever.(5)Connect the Techstream to the DLC3.(6)Turn the ignition switch on.(7)Turn the Techstream on.(8)Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / VSC Sensor Neutral Memorization.(9)According to the display on the Techstream, perform VSC sensor neutral memorization.(10)Turn the ignition switch off and disconnect the Techstream.

Wow really? I never knew this. There should be sticky. Everyone always mentions camber bolts and lower control arms and rubbing, but they never mention "resetting the vsc"

Anyone in So-Cal have a techstream to help me out? ;)

My stabity control system has been doing all kinds of interesting things since I installed coil overs and swapped to sticky tires. Thanks for the heads up on this....

Interesting, we've been racing and tracking our Spec86 and Project BRZ both on coils for a year now and now TC issues. Perhaps it's because we didn't slam em to the ground?

-mike