Hey everyone, I have a 4sp currently behind a ~450HP 430. I am currently building a 500+ HP 455 to replace it. I am typically an automatic guy - this is the only car I have with a manual. I had a Hays kit in it before - installed 8 years ago - was never happy with the way the clutch hooked up under higher load. Normal driveability was great, but if I even minimally tried to dump the clutch off the line it would slip. All adjustments were ok. Any suggestions on a better clutch? I would like more grab but not a lot more pedal pressure. I looked at the various options at summit, but am just unsure. Any input is appreciated.
I use a 11'' pro touring dual friction (Borg and Beck) full copper organic with segmented ceramic metalic, from Kiesler transmissions. Its was rated for 650 H/P. peddle is a little stiffer then stock. seems to hook up well, havent tried it with slicks, my engine has 500+ H/P. I would call Mcleod Racing and ask them.
I use the McLeod 12" PP with the 800 series disc. Car has gone 11.80's with it and made 399 at the wheels at 4500 RPM before I stopped the dyno (had other issues). Not sure if the 12" will work with a stock bellhousing, if you are using one, but they have 11" options.
Borg and Beck type will have probably AT LEAST 4x the pedal pressure of a diaphram (my leg dyno estimate). Count on it showing every other linkage component (maybe even the thrust bearing) to be a weak link. Been there and done that. Reinforce the clutch pedal; switch to a spherical end link for the adjusting rod (the stock one will likely be too short). You should also reinforce the bolt-in flange on the frame that holds the z-bar in place. That thing flexes all over the place under the pedal pressure. The rubber bushings will evaporate in an eighth of the time. When you walk after stop and go traffic you'll constantly go in circles because your left leg is so much stronger. If you have a troublesome achiles tendon, you'll never be able to handle a Borg and Beck. Really!
I dont think my pedal is that stiff, but i run to stay in shape, and at 210 lbs. my 45 year old legs are strong. I installed bushings on the pedal and Z bar, use a spherical end link, my frame bracket does flex a little, i plan on fabricating a beefer bracket, and install with nuts and bolts. thanks for the info, i was not sure that was normal. Does the bracket flex at all with a stock presure plate?
any opinions on the Centerforce dual friction clutch? If the description holds true it seems to be a decent choice: http://www.summitracing.com/parts/CTF-DF148552/ Centerforce Dual Friction clutches generate up to a 90 percent increase in holding capacity over stock systems. These clutch-and-disc sets are designed for engines producing high horsepower and big torque outputs. Perfect for 4WD vehicles, all Centerforce clutch systems provide smooth engagement and light pedal pressure without compromising high performance. I don't want to go down the path of having to reinforce the rest of the set up.
Very pleased with this/my Centerforce setup. I did use an adjustable Lakewood ball stud to account for a thinner flywheel after 300k miles.
