Just installed CS TCU and now clutch is slipping?

I just got my TCU back from eric355 and popped in. Before driving the car I checked the PIS with X-Diag module from mechanicservice666, and it said the current value is 4.3mm. Seemed low, but I thought I would go for a drive. Everything seemed good until I drove the car with more than 30% throttle. The car is basically revving up and then settling back down in every upshift, like it expects the clutch to be out sooner than it actually is. To see if it was a clutch wear problem I did a hard acceleration from a stop and it lit up the tires no problem. Any ideas on what to try? There is a lot of data I can extract from the X-diag but I am not sure what I should be looking for.

As a side note but also interesting:
When I bought my car it made a gear scratch/thunk noise when shifting from 2-3 and from 4-3. When I put in the new ECU the sound seems to have disappeared from where it was before but now makes a loud thunk when shifting into 1st from a very slow rolling stop. I was sure this noise was a bad synchro, but now I am thinking it has to be something electronic like actuator centering or something because the sound changed.

 

You are right
I wanted to see if there were any easy checks I could do before doing that. For example, is it worth doing a clutch bleed? Is there a DIY for that on the F1 cars?

 

Eric, thanks again for doing this, it is already much better than before. The local shop can't get me in for over a week so I was trying to do what I can. I did try going to 4.0mm with x-diag and didn't notice much difference. It sounds like a little surging is normal so I am probably not too far off. One thing I did see in x-diag is that my F1 pressure pumps up to 50 bar and then rapidly bleeds down to 45. Maybe a leaky bleed screw or normal, just another thing to think about. I will update when I get it into the shop. Thanks

 

I didn't know that you can set below 4mm! That sounds like where my car may need to be.

 

Update:
Just got the car back from the mechanic. He tried adjusting the PIS but it never behaved as quite as expected. He said he thought it was a sticky throwout bearing possibly causing issues, and we went ahead and replaced the clutch and flywheel as well to be sure. Of course, my car had the old style ring gear so add some more $$$. Unfortunately, after driving it again I can't notice much of a difference. Here is a video I made to try to catch what is happening, but strangely you really can't tell from the video except for at about 2:43 when I am full throttle but under 6k rpm. I feel like its slipping and surging at least 2000rpm on upshifts at full throttle, and it is slipping up to 3000 rpm taking off from a stop. Any other ideas?

 

This is interesting info. I have been reading lots about setting up the F1 system to try and fix this and the only variable that is discussed is PIS. I will have to see if I can reset the CDI with X-Diag. I also saw in another thread that it is believed that new clutch closed position affects how the car drives as well. Is this correct? Do you have a good explanation for how to tune these values to get it driving right?
Thanks!

 

This is fantastic. Exactly the information I was looking for. I am assuming that the mechanic input the new clutch closed position when he put in the new clutch.
So in my case with excessive slip the plan of attack should be:
1. Drive the car and get it up to full temperature
2. Park the car key off and insert dongle
3. Key on and reset CDI
4. Perform self learning
5. Set PIS at lowest setting that will not allow output shaft to spin in reverse with car on jack stands
6. Drive the car 50-100 miles?
7. If not 3750<CDI<4250 add or subtract 1mm to New clutch closed position? (Subtract for higher CDI, Add for lower?)
8. Repeat until CDI is in range

Is this a good methodology for getting the car set up right?
Thanks again for shedding more light on this. I will do a search for the thread you mentioned and post a quote of it here.

 

http://www.ferrarichat.com/forum/threads/faq-how-to-upgrade-a-360-f1-tcu-to-a-360-cs-tcu.239882/#post-142225332

"The CS tcu won't work properly and leave you with blank display/improper operation unless you carry out the following with an SD2:

1. Plug in an SD2, and on the parameter page, read the "new closed clutch position" and note it down (FROM YOUR ORIGINAL TCU)
2. switch off the battery
3. Swap it out for the new t.c.u
4. switch on the battery, switch on the ignition and leave for thirty seconds.
5. plug in the SD2. On the diagnosis page, write the original closed clutch position figure into it.
6. Set P.I.S. to around 4.7 to begin with.( this can be played with later to suit)
7. Now on the diagnosis section of SD2, a FULL cycle test has to be carried out.
8. Next, under diagnosis section, carry out a self-learn. At this stage, you will probably still see a blank screen.
9. Switch off the Sd2 and then the ignition. Leave it for thirty seconds, then switch the ignition back on and manually run up and down the gears.
By this time you should see your display working and gears should all be selecting as they should. If it's all o.k you just need to fiddle about getting the P.I.S setting right until the change is quick.

I've been fitting CS tcu's to standard cars since they came out, and this method works every time..."

 

not sure I follow what you are saying. PIS is a unit of length in mm. CDI is probably some unitless dimension that shows a moving average of how much slip is occuring (is my layman understanding of motob description)

 

Interesting, I would have thought the best way to save the clutch would be to drop it as fast as possible rather than add extra slip time. The only reason to slip at all from my knowledge is to prevent stall and lurch from happening. I will hopefully have a chance to play with the new clutch closed position later this week and report back with more video.
Thanks

 

I did some driving tonight, unfortunately it appears that X-diag cannot reset the CDI, mine is stuck at 3378. Also I cannot change my new clutch closed position it is 15.6. I did pull down the PIS from 4.17 to 3.98 which helped a little, but not enough. I need to find someone with a leonardo that is willing to let me borrow it in southern california.....