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Competition Preformance Clutch Talk

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Well, as most of you know my GMC/Cummins build-up is now pretty much finished and I am driving it pretty much daily to get some miles on it before it gets put in the shop for the winter. I have yet to pull (as I only have about 500 miles on it so far) and would like to break it in a bit more... but I have one pull left and if I get the urge I just might do it!



Anyway, about my clutch. I am running Haisleys Comp Puller. So far it seem to be very streetable although doesn't shift as fast as my brothers Haisleys Street Puller/5-speed (mine is a 6-speed). And although I haven't done many high RPM shifts with it the odd time above 2500rpm I can feel the clutch pedal start to push my leg up.



Here is my question... I have done a few little short burn outs with the truck and it doesn't work nearly like the Street Puller does. If I were to start out in 3rd gear... . start reving it up (clutch disengaged) at about 2500 RPM it starts pushing my leg back up and starts pushing my leg out on its own and I almost snuff it out. Now like I have said above, I haven't pulled with it yet but isn't it going to want to do the same thing hooked up to the sled? I haven't really tried to stand on the pedal to keep it down but I imagine that after 3000 I won't be able to hold it down.



So how are you guys starting at the line with these clutches buzzing it up to 4000+ and being able to build boost without the RPM locking the clutch up on its own and starting to turn the tires????



I called to asked Haisleys this today but they were out of the shop so I thought I would ask on here while it was still fresh on my mind!



RyanB
 
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Hey Ryan,



can't help ya on this one but, if you going to another pull let me know,



maybe we'll get lucky and it won't rain :-laf



Scott
 
Well yea it will, but you will also have a sled helping to hold you back. I am not a manual guy, maybe sleddy, Joe Dailey, or the infamous JW3 can chime in. I wonder if that is one of the reasons some of the manual guys just jam the throttle when they are spooling up. Gives them some R's before the clutch engages.
 
Ryan I have the same RPM issue with my Haisley Comp puller. I've changed the counterweights, which helped slightly. I agree with you that I don't like it engaging that low in the RPM range. After a pull on a track where I really slip it coming out of the hole, it is hard to get into gear after the pull. This makes it difficult for pull-offs. I think part of my problem is also my slave cylinder which I'm going to change out.
 
The stock one for now. How do you like the South Bend? I've been looking at them, but I gotta figure out if it will work in my '91, with a '95 bell housing.
 
I really like it! Sure it will work!!! you just have to make it work! mine works and its in a 2003 6-speed belhousing and a 1989 GMC firewall a little fabrication and anything is possible. I am really happy with it though and I love the clutch... just trying to figure this out. I am going to phone Patty in the morning and have a talk to her about it



Ryan
 
Hey we have run these clutches for several years, it is just a matter of getting the weights correct for the RPM you want. We run Dodge but the clutch is basically the same and it takes some playing but we have ours set to start pushing us out at about 4500 - 5000 RPM. Some of the older ones used "big" weights but I think they all use smaller ones now, just off of memory somewhere around 6-8 total weights should be close for each arm.
 
Here is a pic of my clutch bolted up and everything... I take it there are two many weights then on mine????
 
I talked to Haisleys today... Van said that 3000 RPM on the street is about right for the clutch, said that hooked to the sled it will be a bit different. When I first asked Patty she said you could remove weights but Van didn't mention it to me. I will have to see what the winter brings and find some time to pull the transmission out and do some adjusting if it needs it.



Thanks for the responses... Ryan
 
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