I drove home tonight without PSM and could actually feel a difference in the responsiveness of the car. Am I imagining this or what? Who else drives without PSM?

 

 

I do my hardest driving without PSM, but have never found it
perceptible in any public driving environment. I would suggest
asking someone to set PSM on or off while you weren't looking,
and then put tape over the switch so you wouldn't know, and
then try to tell by driving whether it was on or off.
I never turn it off in public, and if your feelings are really the
placebo effect, I would hate for you to get into a situation
where you needed PSM and it wasn't there.
I do notice the placebo effect in me too. A freshly waxed car
with a fresh oil change definitely 'drives smoother' and the car
sticks better right after I've checked the tire pressures...
Still though, if you're getting the tires to sing in corners, you
will notice PSM *is* like a car sedative...
Joe

 

I drive with PSM off...the car is more throttle responsive.

 

I think that might hold true on a bone stock car. On the modified cars the car pushes the threshold of the PSM just in tire slippage. Mine will send you through the windshield getting on the highway if I leave it on

 

what do people with highly engine modded cars do about PSM?

 

They disconnect the throttle body shutdown.

 

Do you need the after market(scargo) larger throttle body to do this? if yes- does the computer freak out in any other way... is it drivable without any dashboard faults?

 

I turned it off last night in the rain, gassed it through a corner in 2nd and let the back wheels drift a bit. Sure felt great, but would be dangerous in traffic

 

I believe so. There is a little more to it than simply changing the TB. To install the larger TB you need to make changes (sizing) to TB connections. In additiion, you need a certain amount of power for this TB to work properly. This TB would drown a stock 415 hp power plant. Give Rob @ S Car Go a call. It is very drivable. No computer problems/faults.

 

My car has a strange condition, with the PSM on with wet streets the car is almost undriveable. It darts all over and seems to open and close the throttle. I recently had to turn it off to get home safely. It's going in to the dealer but am curious if anyone has had this experience?

 

Check your tires. Are the rears worn down and the fronts
still have lots of tread, or maybe the other way around?
Joe

 

Checked both tread and tire pressure, at first I thought it was a flat.

 

The sensitivity of the PSM system doesn't seem to be identical from car to car. Our bone stock X50 seems to allow a lot more slip than another X50. The dealership has a system test that you can request them to recaliberate the ABS and the PSM systems.

So far, I've found that PSM only slows me down in very tight autocross corners (the kind that you would like the car to rotate a lot). On the track or on the street, I am not sure pushing over the 8-9 degrees of slip angle or having the wheels on the same axel spin at difference speed (when PSM kicks in even if you turn it off) actually gain any speed. Excessive tire slippage may give the feeling of running faster but often times it's not.

Note that I don't drag race so my observation is limited to the tracks and streets.

 

Interesting, I'll ask them to recalibrate. Thanks