F1 Creep in 1st ok?? | FerrariChat

F1 Creep in 1st ok??

Discussion in '360/430' started by robertpel9, Nov 22, 2016.

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  1. robertpel9

    robertpel9 Formula Junior
    Silver Subscribed

    Feb 28, 2004
    492
    Orange County CA
    Full Name:
    Robert
    About 1500 miles ago I had a new clutch installed in my 360 along with the latest TCU used in the 2004 models (I have a 99)so that my mechanic could adjust the PIS, etc

    Anyway car functions fantastically. Leaving from a stop never goes above 1600 rpm's and is smooth as silk. All shifts are seamless and its night and day vs the 99 TCU and old clutch.

    I have noticed under certain circumstances if i leave it in 1st while stopped I feel a little vibration and if i take my foot off the brake the vibration leaves but the car will creep forward just a tad. Nothing extreme but a very slow creep. This is only under certain exterior terms as well as if the car is heated up fully or not. Otherwise it will not creep.

    I always have since buying the car shifted to Neutral under any stopping condition. I realize the creep means the clutch is dragging a tad which is not good but i fi am always in neutral at stop does it matter and is the creep offset by the other benefits of the car performance. I have driven a lot of 360 F1's and none have been even near as smooth at launch and seamlessly shifting as this one.

    My question is given how minimal it is and that it is not even existent under many circumstances, coupled with the fact that I ALWAYS shift to neutral when stopped, should I still have the PIS bumped up a little bit and completely eliminate the drag, or am i better off being happy with how silky smooth everything is and the perfect takeoffs = little wear, etc. It's free and simple to bump the PIS, just want to make sure I ma not doing more harm than good.

    Very interested in this - any info anyone has on this, please let me know.

    Robert
     
  2. LV360

    LV360 Karting

    May 1, 2014
    81
    Las Vegas, NV
    You need to have it adjusted. Aside from wearing the clutch and heating up the flywheel the entire time you're stopped in first, it is also not fully disengaging for shifts.
     
  3. lauris

    lauris Formula Junior

    Jul 27, 2005
    281
    Glasgow
    Full Name:
    Scott Laurie


    correct - will only lead to premature wear or clutch plates and doesnt sound like it is properly disengaging between shifts !
     
  4. LorenzoR

    LorenzoR F1 Rookie
    Rossa Subscribed

    i would get it adjusted asap cuz its wearing the clutch as others have stated
     
  5. 24000rpm

    24000rpm F1 Rookie

    some notes

    if the clutch is cold when you adjust the PIS, it is possible that you get the following result:

    not creeping on 1st gear and seems perfect, then drive the car for a while it creeps.



     
  6. KJB355

    KJB355 Karting

    Apr 4, 2006
    154
    Chicago
    Full Name:
    Kenneth Brom
    #6 KJB355, Nov 23, 2016
    Last edited: Nov 23, 2016
    I spent countless hours with the PIS setting on my '03 360 after changing the clutch. Hot, cold etc. I fully understand exactly where you're at, and I was tempted to leave my setting alone after getting it to exactly what you're experiencing. My goal was that magical setting that engages the clutch immediately and no flare up past 1,500. My thought being that as the clutch beds in, the creep would works itself out. My OCD kept haunting me - and it ultimately wasn't about the clutch parts - but the gearbox. Synchros, etc.

    I increased the setting 0.1MM and experience no increase in initial engagement, but did result in a 2-300 rpm increase in rpm to full engagement. There is never creep and I can modulate that out with throttle and the clutch always engages within a car length or less. It's important to keep in mind that the car idles at ~1,100 rpm. All dialed in ... I won't be changing the clutch again in my lifetime.

    I drove several 3 pedal 360s and 430s and it's very difficult to engage the clutch and get going at 1,500 rpm or thereabouts.

    Hope this helps.
     
  7. Sean F.

    Sean F. F1 Rookie

    Feb 4, 2003
    3,066
    Kansas
    Full Name:
    Sean F
    Just for clarity, are you saying there is creep even when you are in N or just when in 1st and stopped and you let off the brakes?
     
  8. robertpel9

    robertpel9 Formula Junior
    Silver Subscribed

    Feb 28, 2004
    492
    Orange County CA
    Full Name:
    Robert
    #8 robertpel9, Nov 23, 2016
    Last edited: Nov 23, 2016
    Thanks for the feedback. I stopped by RMT today here in SoCal who performs all of the service on my cars. Heres the scoop for what its worth

    -I have a 99 with the TCU used in 2004
    -Clutch and TCU were replaced ~2600 miles ago
    -PIS was set to 4.3 and the car took off silky smooth, etc. There would be some creep when Stopped in 1st gear under certain conditions
    -Hooked up car today. Clutch wear is only 2% after 2600 miles. Clutch Thickness still at 15.1 and everything looked good under diagnostics.
    -Bumped up PIS a notch to 4.4 and there is Zero creep hot or cold now and takeoff is still seamless and smooth occuring when warm around 1500 RPMs and when cold around 1900

    Looks like things are all set. Honestly with the clutch wear at only 2% i was tempted to leave it alone but Randy said it could be placing stress on the synchros, etc and wanted to bump it up just a touch. Now everything is still very smooth and no creep

    Thanks for the help. For those of you with early 360's upgrading the TCU is a no brainer. It easily extends clutch life just as a result of being able to manipulate variables such as stated about and it will pay for itself very quickly

    Let me know if anyone has any questions or feedback - Looking forward to some lunchtime canyon carving
     
  9. 24000rpm

    24000rpm F1 Rookie

    i had a hard time understanding why adjusting pis takes such a lengthy time.
    Maybe I did it wrong myself?
    I have the leonardo, all i need to do is to find the PIS value that won't creep and below which it creeps. Starting at 4.5. Then verified by leonardo that some rotation is 0.(forgot what it is)
    usually takes me just a few tries, absolutely less than 10 tries and less than 30 minutes usually.
     
  10. robertpel9

    robertpel9 Formula Junior
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    Feb 28, 2004
    492
    Orange County CA
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    Robert
    I took about 3 minutes total this morning. Very simple
     
  11. sparetireless

    sparetireless Formula 3

    Nov 2, 2003
    1,587
    the lag between gears is greatly reduced,

    only thing to remember is go to N at red lights.

    if you adjust all way to zero movement, the lag between shifts starts to become too much.

    IMHO, and my clutch has over 30k miles on it and still works fine with the creep.
     
  12. Skidkid

    Skidkid F1 Veteran
    Owner Rossa Subscribed

    Aug 25, 2005
    9,547
    Campbell, CA
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    John Zornes
    The biggest problem with this approach isn't the clutch, it is the gearbox. You are shifting when the clutch isn't fully disengaged. The difference vs a properly set up car isn't worth the cost of a gearbox to me.
     
  13. KJB355

    KJB355 Karting

    Apr 4, 2006
    154
    Chicago
    Full Name:
    Kenneth Brom
    +1, but 30k on the clutch and no issues is impressive. The creep does improve the shift and engagement, but I can't get past the not being fully disengaged. It's incredible how good the system works and even with no creep, the shifts are very fast.

    To Sparetireless: have you ever changed the gearbox oil? Any metal, shavings, etc.?
     
  14. sparetireless

    sparetireless Formula 3

    Nov 2, 2003
    1,587
    you just need to go into N at lights.
     
  15. tazandjan

    tazandjan Three Time F1 World Champ
    Lifetime Rossa Owner

    Jul 19, 2008
    39,195
    Clarksville, Tennessee
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    Terry H Phillips
    In my opinion, bad advice. Really increases the loads on the synchronizers and other transaxle parts. The equivalent of keeping your left foot on the brake all the time to reduce reaction time. Does that, but also wears out the brakes and creates unneeded heat.
     
  16. rustybits

    rustybits F1 Rookie
    Professional Ferrari Technician

    Jan 28, 2007
    2,509
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    Eddie B
    It's not set right if it creeps. It's more than just setting PIS. If the clutch thickness setting is not right you will also get this. The wear pecentage is just an extrapolated figure based on PIS and clutch thickness. Even when the clutch is a fresh instal you often see a wear % of 6 or so when it's configured right. With it dragging you are piling heat into the flywheel whenever you aren't moving. Even sat with it in neutral. This heats up the clutch plate and makes matters worse. Get it to someone who knows how to set it right...
     
  17. albkid

    albkid Formula Junior

    Jul 1, 2016
    318
    Full Name:
    Jim
    I am surprised that the mechanic who setup the clutch let the vehicle leave his shop with it acting this way. As others have offered, I would instruct him to reset the clutch to eliminate the creeping.
     
  18. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    37,122
    Cowboy Capitol of the World
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    Brian Crall
    I agree. It is also quite commonly from distorted flywheels. In use they turn into a cereal bowl. The disc wears to that shape and when a new clutch is installed it will never work correctly no matter where you set it. There is great paranoia about resurfacing the flywheels and some do not want to purchase a new one. No one ever measures them for their shape and a large percentage of even the new flywheels are out of spec, sometimes by a lot. 360 flywheel was made to be very light and they warp badly. I have redone a lot of other shops clutch jobs because they just reused the flywheel and never bothered to throw a straight edge across it and measure it.
     
  19. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    37,122
    Cowboy Capitol of the World
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    Brian Crall
    I really would like to agree but experience has taught me otherwise.
     
  20. scuderia09

    scuderia09 Formula 3
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    Sep 6, 2007
    1,045
    #20 scuderia09, Nov 30, 2016
    Last edited: Nov 30, 2016
    That why you need to record the PIS reading before replacing clutch and set the clutch at the same reading, before your burn that new clutch ,i bet it smoking also :)
     
  21. Skidkid

    Skidkid F1 Veteran
    Owner Rossa Subscribed

    Aug 25, 2005
    9,547
    Campbell, CA
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    John Zornes
    I don't see how that helps. Shifting with the clutch only partially depressed isn't a good idea. It doesn't matter if you are in 1st or N.

    If the clutch is set up right, 30k plus isn't a big deal.
     
  22. sparetireless

    sparetireless Formula 3

    Nov 2, 2003
    1,587
    then your golden
     
  23. robertpel9

    robertpel9 Formula Junior
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    Feb 28, 2004
    492
    Orange County CA
    Full Name:
    Robert
    please see my reply post. We bumped the PIS from 4.2 to 4.3. No creep nowv and shifts are still crisp and seamless. working perfect
     

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