Guys,

Modding my Mach 1 670 TRA clutch. Going with 296 Ramps, 18-19gm pins. It was advised by BIGJOHN on DOOtalk to go with a 160/230 spring. I'm still learning clutch science. What is the difference
in using a:

160/230 w/ 296 ramps / Clicker #3 @ 8000rpm
260 / 320 w/ / 280 Ramps / Clicker #3 @ 8000rpm

The reason Im asking is I have the secondary out of a 98 Mach Z with a 53/44 progessive helix and BEIGE
spring. Stock was a 44 helix.

What is the engagement RPM of the 296 ramps. The 280's are 5500rpm

What a science..lol. :drunk:

Thanks,

D

the secondary clutch from a 98 machz wont fit a mach1 670 sled, the 98 has a splined secondary clutch and the old 670 mach1 is a keyed secondary. as for the engagement rpm there are to many variables with the TRA to pinpoint what you would run, if you were to run a 320 finish spring over a 230 with the same weight pins you would be running ALOT more topend rpm and would need to turn down the clickers in order to run the 8000rpm you refer too. theres alot to what effects your topend rpm like helix angles, primary spring finsh, pin weight, ramp hieght, etc,etc. generally once you find a pin weight to start with you would adjust the spring on the start and finish to get the rpms you want, for example if you run a 19 gram pin with a 160-230 spring and want to raise the engagement you would go to a higher start on the spring like a 180-230 or 200-230, or if you need more rpm on top instead of turnign your clickers up you would want to go to a higher finish spring like a 160-280 or a 160-320. then fine tune with your clickers, try to keep in mind that you want to keep your clickers in either #2 or 3 position to pull the best, this number will lay the ramp at the most parallel position to the rollers, if you find you need to raise clickers in order to get rpm on top its better to raise the finish rate on the spring.