On a Cayman S / Boxter S 2008? I read somewhere that you needed the sport chrono package to be able to turn PSM off? Is that true? Thanks!
Even Sport doesn't turn it off. It places it in standby. It does increase the skid angle permitted before it engages.
Unless it has been changed, without sport crono you can turn it off and it will come back on if one of the frt wheels triggers the abs. If you have the crono both frt wheels have to go into the abs mode.
Hmm, so without the sport chrono if you turn PSM off can you get the back out?
Is there anyway to completely defeat psm? It is quite a hinderance in tight corners on the track. This abd system is a very poor substitute for an lsd.
+1
Sport Chrono merely gives you another 2 things:
1) The presence of an aggressive PSM map, allowing more slip before engaging
2) Remap the throttle to more aggressive
All Porsche with PSM have PSM defeat *GT2 is special, out of discussion here*
PSM defeat means that PSM is totally OFF until you engage brakes so hard that ABS comes into action. PSM defeat exists both in SC and non-SC vehicles.
Any threshold braking can induce some abs action. So basically you can turn it off for your warm up lap but as soon as you start pushing it and activate abs it's back on? Is there a fuse I can pull?
There has been a lot of discussion of how PSM and the braking system interact in the "Brake issues at track" thread. PSM is
NEVER
really off. PSM provides ABS functionality - there is no separate ABS system. The "PSM off" button can disable certain functions of PSM, but some of those functions can be reactivated if PSM thinks it is an "emergency situation." The following links may provide useful information, and the "Guide" referenced in several of the links has lots of good information.
http://www.planet-9.com/cayman-competition/19116-brake-issues-track-7.html#post239623
http://www.planet-9.com/cayman-competition/19116-brake-issues-track-7.html#post239727
http://www.planet-9.com/cayman-competition/19116-brake-issues-track-7.html#post239747
http://www.planet-9.com/cayman-competition/19116-brake-issues-track-7.html#post239829
Lots of good info Fort. My issue is not a loss of braking my issue is too much (automated) braking. Some themes emerged. 1. If you disable psm completely you lose abs, not what I want. 2. There are some serious marketing lies with respect to abd: (brakes a single rear wheel under acceleration if that single wheel is slipping - like an electronic LSD). Might have to look into disabling some of these systems on their own as you suggest in the last link. Thanks for the info.
I have found that to run fast in this car, you have to turn off PSM, then one needs to refine the threshold braking technique to stay out of the ABS, which will turn the PSM back on... yes, it's hard to stay out of the ABS, but not impossible with practice. I have sport chrono, which in "sport" mode, keeps the PSM further at bay. You could say, that if you're getting into the ABS with your threshold braking, then in an older car or a race car without ABS, you'd be locking up the brakes and flat-spotting your tires anyway... not a good thing.
brad
Understood. I was just too lazy to retype all the PSM information within the current context.
Regarding ABD, it might actually stay off when the "PSM Off" button is pressed. It may be that the only system that gets re-activated in an "emergency situation" is vehicle dynamic control.
I think ABS is the one (street car) driver's aid that can be done better by the computer than by a person which will result in faster lap times. Threshold braking includes some degree no matter how small of lock up and release to minimize stopping distance especially with street tires. Which brings up another issue a lot of this is setup dependent. Meaning especially the pad compound and tire compound components. Unfortunately I ran with ps2s this week and I think it exacerbated the issue. Hopefully this issue will be greatly diminished with r comps, I know it is on the Carrera S and GT3.
