[Supras] New clutch slipping, shifting problem?

Walker, Brian (Rich. Dist) Brian.Walker2 at VDOT.Virginia.gov
Wed Feb 27 16:42:57 CST 2008 

This one was, billed as 'Circuit-cross' like a hill climb format. The
standard NASA time trials (hot laps, full sessions) are license required
and I don't have that experience yet.

-----Original Message-----
From: Jeff Mohler [mailto:speedtoys.racing at gmail.com] 
Sent: Wednesday, February 27, 2008 5:39 PM
To: Walker, Brian (Rich. Dist)
Cc: cthommes at adelphia.net; Supras at supras.com
Subject: Re: [Supras] New clutch slipping, shifting problem?

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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