Hi Folks, I have a 2007 F430 Spider with the CFC231 gearbox, and I have been reading about setting the PIS to optimise gear change and clutch wear. 1. Does anyone know the official Ferrari tolerance range for setting the PIS (e.g. 4.5mm - 5.2mm)? 2. Is it safe to reduce to 4.0? To provide fast shifts and to preserve clutch wear (Or does this cause wear on gearbox components)? 3. Can you reset the “Clutch Wear Index” using a ThinkDiag? Thanks!
1. Does anyone know the official Ferrari tolerance range for setting the PIS (e.g. 4.5mm - 5.2mm)? 4.8 (min) , 5.1(base) 5.4( max) IIRC 2. Is it safe to reduce to 4.0? To provide fast shifts and to preserve clutch wear (Or does this cause wear on gearbox components)? To tight of a PIS can cause transmission damage when it gets hot - doesn't release clutch enough and you can continually grind gears ( just like not depressing clutch all the way in a 3 pedal clutch) 3. Can you reset the “Clutch Wear Index” using a ThinkDiag? Yes - and every time you change the PIS you need to reset it and do a city cycle drive to test if PIS is good The first signs of engagement should be 1020-1040 rpm with fully engaged clutch around 1700-1800 Monitor the clutch wear index .. anything from about 3250 to 37500 means you clutch is set and wearing correctly - this number changes dynamically - this is my preferred range based on normal city / hwy cycle - if only hwy lower side of that range , if only city higher side of that range Signs of to tight PIS .. rolls on its own when high in 1st and brake released , doesn't shift into reverse when hot , delayed shifting between gears Just for reference last PIS I set correctly on a f430 with new clutch was 4.86 Thanks!
What Flash 32 says . Also too tight a PIS will cause stalling at idle with premature clutch engagement i.e. during idle starting up a small hill, engine stalls,
Hi Flash, thanks again for the previous guidance. I have since set the PIS to 4.9, reset the clutch wear index, and have drove about 200 miles. The car feels good, however, I have been monitoring the Clutch Wear Index which started at 4000 and has been gradually reducing, and is now at 2,201. from your previous note, it should be around 3,250 - 3,750. So mine is now low I guess. I would appreciate your thoughts and guidance (e.g. is this a problem, or should I leave as is, or increase the PIS from 4.9 to 5.0, etc)? Many thanks
Tell me how you drove ..the numbers always change based on drive cycle Try to do a combo city/ hwy cycle Perform 9 start and stops at various levels of acceleration Let me know the exact RPM when the clutch starts to engage?
Drove mix of city and highway, mostly just cruising. I will take it out tomorrow and try to determine when the clutch starts to engage (not really sure what to look for, but will try take a video of the tachometer). Thanks!
Also as a sanity check you can put it into Auto temporarily and see how it performs A too tight pis will be evident very quickly in Auto
Drove about 80 miles today. Tested in manual and Auto. In manual mode, drove well, albeit slightly clunky at low speeds. In auto mode, fairly smooth at low speeds, albeit takes forever to select the right gear. Probably 60 of the 80 miles were on the highway today (avg. 60mph). CWI reduced slightly to 2176. I took a video but can’t seem to upload it. From standstill to 20mph, the rev counter immediately goes from ~1000rpm to ~1550rpm then immediately jumps back to ~1250rpm (where it seems to catch the clutch) then increases gradually.
Time difference may be a challenge (US to UK) but would appreciate if you could summarise your view on the forum, as may also benefit others trying to optimise their PiS. I think I may adjust the PIS from 4.90 to 4.95 and see how this performs. Thanks.
I have spoken to many people in the UK as I make it easy Every car is different and an interactive session can make all the difference Here is what you need to cover when adjusting PIS All tests hot When feathering the accelerator when do you feel it grab ..this a delicate process .. sometimes I do it in a parking lot with tiny inclines to see when the clutch actually stops car from rolling I repeat the test in reverse The point of initial friction should be 1025-1050 And fully engaged at 1700 After that test ...I would light acceleration from stop ..this should be smooth Repeat these in race and sport Every time you change the pis reset clutch wear and do at lease 3 stops and goes changing to 2 and getting to 2000 rpm before stopping At the end after a 15:drive in sport mode ..I like to see a clutch wear index in the low 3000s
Thanks Flash, amazing guidance thank you. I’ll plan to walk through the steps above, and let you know how I get on
Thanks again Flash. I have been optimising this now for the past few weeks since the weather finally improved here post winter. With the PIS at 4.93 the CWI was closing in on 3000, so I reset it to 4.97, and it seems to be sitting around 3,250 after about 60 miles, which seems like it’s now in the right ball park.
