What effect does a setting of PIS have on behavior of the cars shifting? A setting of the following values for example, what would the car act like with each setting? 3.8 4.0 4.2 4.4 4.6 4.8 5.0 5.2 any comments appreciated, the search reveals little if any comments as a function of shift time. I am aiming for as quick as shifts as I can get without a jerky take off in first. Mine takes off real nice, but it seems to lose 700-900 rpm between shifts. I do not want to change or reflash the ECU< I just want the best stock has to offer. I am willing to trade smoothness for quickness but the take offs are afact of life and I do not want to chirp the tires on take off.
I think the higher the setting the longer the clutch engagement on take off. Also probably slower shifts. Mine was setup with the minimum possible setting without clutch drag and without difficulty engaging reverse. Still slow engagement with lots of slip on take offs. Same slow shifts. Stradale TCU sorted all that out. Magic. Can't imagine why you wouldn't want to do it. Sounds like it's what you want.
I have cs tcu in my 360 . It is a wonder but you still need to set pis. I put mine at 4.7 and my clutch is 78% worn. No idea how to compare this to other values though but think the lower settings require a newer clutch?
mine is set at 5.5, dealer claimed he could not change it since the clutch is 65% worn, I am tempted to take the car to someone else for just a clutch adjustment since I am hoping to make my clutch last until I need belts (soon). Car drives fine but its also the only F1 I have ever driven. So what is 5.5 doing to my clutch ? by the way is 1999 with a later TCU
The shifts are faster with lower values but if it's too low the clutch will drag and wear. An SD3 can check if this is happening and additionally the car may creep forward from standstill when in gear. The minimum recommended value for a Stradale is 4.2mm. When I had my Strad TCU fitted I asked my mechanic to set it to 4.0mm to see the difference but the clutch did drag at that level (in gear the car crept forward from standstill). The shifts actually became a bit less smooth too. After some test driving in which these facts became apparent I had it set back to 4.2mm.
The figures in the WSM are based on a good flywheel with the system in tip-top condition, and was written when new, not after a decade and after being hacked at by the Ill-informed. I would say perhaps 15% of cars I've encountered on arrival are in tip-top condition. Most have actuator leak off, worn flywheel, sticking slaves. Don't expect to be able to look at a list of variables and state "4.1 is the optimum setting for me". This subject has been done to deaths much as the cam-belt interval debate. But Once more......... 1. Clutch wear% is an extrapolation, which is a mere result of figures that have been dialled in, and therefore largely innacurate. 2. Many clutches I've seen have been trashed through poor setup and lack of flywheel replacement. 3. No two cars are the same. 4.1 may work on one car and fail to work on another. 4.quit trying to analyse it. Find someone who properly knows this system to do your clutch change and set it up, then enjoy the many many miles of trouble-free driving that will result...
I had it set to 4.2 and it runs great. Thanks, its a whole different car. the other guy is probably right too, in that it varys with condition, i have all new parts in mine.
Depends on how late your TCU is. 5.5 is very high, but what's the clutch thickness saying? Ive had early cars with original tcu's at 20% wear when new because of an altered thickness to lower PIS. Also auto-set should be done from cold to achieve lower PIS yet the WSM calls for an I/O test, so you are already at a disadvantage. If you have a post 2002 tcu then your PIS would only be set that high if you have drag (check the input shaft speed at idle in gear after a good thrash down the highway) there are many many reasons why these clutches burn and cause such a bad reputation....poor setup/lack of understanding/DIY fitment.....
