docwyte

Local PCAer told me that I should physically unplug the PSM pump on my car.

He said that turning it off with the dash switch doesn't really turn it off and that it'll still intervene under braking and torch my rear brake pads.

This is news to me, I thought the dash switch turned it off completely and it was off until I either turned the car off and back on again or hit the dash switch again.

Can someone confirm if I'm right or he is?

Tia!

Scott.

That is correct, you'll need to unplug it for the track.

docwyte

Hmm, ok. Where is the pump so I can unplug it before I hit the track next Saturday?

Dock

With the system switched off it will not intervene under braking unless you are outside the trigger boundaries when you apply the brakes, or are inside the boundaries and apply enough brake to place you outside the boundaries. When you release the brakes the system is once again off.

docwyte

That begs the question of what and how high the boundaries are? I'm not a racer but I'm not a novice driver. I usually run in the advanced/expert group, is this something that's going to be intervening on me a lot, so I need to unplug it?

Scott.

It's in the frunk under your brake fluid reservoir and plastic crap. I would take a picture but en route to the PWC races.

Carlo_Carrera

I used to unplug mine but now I don't bother and I don't even bother turning it off with the switch either. For some reason my driving style doesn't cause the PSM to intervene often and when it does it is unnoticeable. As my friends who have ridden with say, "I do not drive with PSM, I drive on it or through it."

You will probably notice craploads of understeer with your 996TT on track. The stock suspension and stock alignment are set up to cause that. A proper track alignment and adjustable swap bars will get rid of it. I have my adjustable bars set full stiff rear and full soft front but you will need to experiment to find what settings work best for you.

docwyte

Can I do a proper track alignment without swapping over to the GT3 control arms?

Carlo_Carrera

I use my car as a fair weather daily and track car. It is pretty much stock, so it depends on what you consider "proper". My negative camber in the front with stock LCAs is maxed out at .8 degrees. That along with the adjustable sways works well enough for me. Your needs may be different.

32krazy!

Pull the fuses

Dock

In terms of slip angle, the PSM does not intervene with the system on until the angle exceeds something like 7 degrees. With the PSM switched off you can have any slip angle and the PSM will not engage unless you use the brakes. Also, you can spin one or more tires with the PSM switched off and the system will not engage as long as you don't touch the brakes. The best example I can give is that with the PSM switched off, you can use the throttle to break the rear end loose, spinning the rear tire(s) and hanging the rear to the outside of the turn as far as you want and the PSM will not engage and intervene with brake or pulling the throttle as long as you don't touch the brakes.

911mhawk

Go to the track with it at least once "as is" and use the dash switch while you learn the car.
You just got the thing and it sounds like a nice clean one you'll want to keep on the pavement.

I had plenty of fun 8-12 times out fist year I had the car on PSS10's with a rear H&R bar and nothing else.
If you decide to make regular track events the norm, some adjustable coilovers and camber plates for more neg and some brake pads get you a lot more control.
A trans cooler will save your wallet and is necessary to avoid cooking the box if you run anything more than short sessions.

Dock

docwyte -

Frankly, I think you should keep track days at a minimum (zero?) on a 996 Turbo as seemingly nice as yours.

THP23

But that isn't why he bought it

Scott.

People can go to the track if they want, give it a rest.