Originally Posted by
mjk1210
With a 7.5 it should have been plenty fast. 6.5 should tequire very little if any boost or turbo. I recently set a guy up with a 6.5 and had nothing added. It was very fast. I run a 7.5 with about 15 boost and 20 turbo. Usually it's turned down though. Check the last setting (#15) it should be between 400 and 600 for that car/motor.
Maybe go up a couple teeth though on the pinion though with the 7.5. should be good for the 6.5
Did you check the slipper clutch?
Yeah, the slipper was actually too tight for my taste. The factory sends out the pre-built slipper center with several shims behind the slipper nut so you can't loosen it a whole lot. I removed some of them yesterday so I can obtain the setting I like.
The 7.5 was an older (2-3 years old) motor and I'm having some cogging issues at very slow speeds with it, too. Hopefully it's just worn out and the new SP 6.5 will bring things to life and stop that issue as well.