[Supras] New clutch slipping, shifting problem?
Jeff Mohler
speedtoys.racing at gmail.com
Wed Feb 27 16:38:49 CST 2008
Brian: You guys run -1- lap time trials?
On Wed, Feb 27, 2008 at 2:28 PM, Walker, Brian (Rich. Dist)
<Brian.Walker2 at vdot.virginia.gov> wrote:
> I don't think there's a problem with the setup, the disk is certainly in
> place correctly (I wouldn't fully engage otherwise would it?)
>
> A ran a lap after the one where slipping occurred and made sure to shift
> smoothly. Went even further into the revs and it was solid (as solid as
> a 20 y/o engine can be) so I'm guessing this occurred from the slipping
> between 1st/2nd.
> As for Geoff's comment, he knows a whole lot more about racing than me
> but this was time trials so a good start does come into play (fastest
> lap) but I try never to launch the car anyway since breaking pieces
> isn't worth a couple 10ths. I think it was a combo of getting used to
> the new FW and engagement point and shifting while the tires were
> spinning and not gripping.
>
> How about the engagement point, I don't believe this is adjustable.
> Seems like it wouldn't change unless the heavier plate takes more
> movement (hyd. press) from the pedal to operate? Like I said, it has to
> be almost to the floor now so it's thrown me off a little.
>
> Thanks,
> Brian
>
>
>
> -----Original Message-----
> From: cthommes at adelphia.net [mailto:cthommes at adelphia.net]
> Sent: Wednesday, February 27, 2008 5:21 PM
> To: Jeff Mohler
> Cc: Supras at supras.com; Walker, Brian (Rich. Dist)
> Subject: Re: [Supras] New clutch slipping, shifting problem?
>
> Besides Jeff's expected "I know more about racing than you" reply,
> perhaps you're actually looking for an answer to your question?
>
> I hate to say it but it sounds like something in the clutch broke. The
> lower disengagement point coupled with the slipping leads me to believe
> that there's something wedged or cocked somehow between the PP and
> flywheel. I had similar symptoms when a puck pad broke free from one of
> it's rivets in an RPS clutch.
>
> I also had similar symptoms when a hub spring broke out of a clutch disk
> in an old Integra I had.
>
> Might be able to get the car in the air and see something through the
> inspection plates without too much hassle?
>
> OOOOoooohhhhhh.... or perhaps you have the disk backwards on the input
> shaft? This would also make all these things happen. That'd suck...
>
> -Craig
>
> ---- Jeff Mohler <speedtoys.racing at gmail.com> wrote:
> > Dude, nobody EVER won a race from a stop.
> >
> > We dont do many standing-stop starts, because it breaks so much stuff.
> > Clutches, diffys, transmissions...everyone's on race rubber that
> > wont give so easy also.
> >
> > if youre faster than someone..you'll catch em in a lap no matter what.
> >
> > On Wed, Feb 27, 2008 at 1:36 PM, Walker, Brian (Rich. Dist)
> > <Brian.Walker2 at vdot.virginia.gov> wrote:
> > >
> > >
> > > Didn't put much, I think it was due to a poor shift at the beginning
>
> > > of the lap. I wasn't sure if that would allow it to slip but
> > > evidently it can. I'll be trying it out under full sessions next
> > > month (these were time trial laps from a stop) and will try to
> smooth out the shifts by then.
> > >
> > > Btw, does the press. plate normally change the engagement point
> drastically?
> > > The pedal has to be depressed almost to the floor now and we've bled
>
> > > it a couple of times.
> > > Thanks,
> > > Brian
> > >
> > > ________________________________
> > > From: Dave Koos [mailto:dave at azsupras.com]
> > > Sent: Wednesday, February 27, 2008 3:51 PM
> > > To: Jeff Mohler; Walker, Brian (Rich. Dist)
> > > Cc: Supras at supras.com
> > >
> > >
> > > Subject: Re: [Supras] New clutch slipping, shifting problem?
> > >
> > >
> > >
> > >
> > > You didn't put too much grease on the input shaft of the trans, did
> you?!?!
> > >
> > > BTDT!! :-O
> > >
> > > Dave 92T & 86 P-type
> > > Mesa, AZ
> > > http://www.azsupras.com/suprattop.htm
> > > http://www.azsupras.com
> > >
> > >
> > > ----- Original Message -----
> > > From: Jeff Mohler
> > > To: Walker, Brian (Rich. Dist)
> > > Cc: Supras at supras.com
> > > Sent: Wednesday, February 27, 2008 9:30 AM
> > > Subject: Re: [Supras] New clutch slipping, shifting problem?
> > >
> > > Could have glazed in the bad earlier shift...doesnt have much time
> > > on it either.
> > >
> > > It SHOULD work itself out...over time.
> > >
> > > If it doesnt..its nothing that 200grit sandpaper can work out, but
> > > we all know what that would take to do.
> > >
> > > On Wed, Feb 27, 2008 at 8:22 AM, Walker, Brian (Rich. Dist)
> > > <Brian.Walker2 at vdot.virginia.gov> wrote:
> > > > I put about 700 miles on my new clutch (kevlar) and FW (AL.)
> > > > before a time trial this weekend. During one lap it started
> > > > slipping very noticably in 3rd so I let off, applied throttle
> > > > again it was again slipping, much more than the stock unit ever
> > > > had. Earlier in this lap I had made a poor shift to 2nd where I
> > > > mistakenly slipped it a fair amount, could this be the reason it
> > > > was slipping in 3rd and 4th? I know I'm not making the 460 ft-lb.
>
> > > > the clutch is rated for (I'd guess I'm in the 320-340 hp range
> > > > with similar torque) I was under the impression that the clutch
> > > > will not slip once engaged unless it's TQ rating is exceeded,
> > > > will poor engagement between shifts
> > > > (ie: excessive heat) cause it to slip prior to this?
> > > >
> > > > Thanks,
> > > > Brian W
> > > >
> > > >
> > > >
> > > > _______________________________________________
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> > > >
> > >
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> >
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