Dave Mackie 630 or TMan 680PS2

[kd]

The TMan 680 always seems to make good power bottom to top.  If set up the way TR says to do it, it'll probably rock. For some reason that extra .020 lift seems to really get it working.

[hrdtail78]

Having a clutch issue.  Waiting on parts and I will address this and put final up in Dyno section.

124 12:1
680
D&D Borezilla
1.442 primary ratio, and in my opinion is not helping clutch.

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[Ohio HD]

Jason, you think rather than lower the gearing in the primary, it's better to lower it after the clutch? I guess I can see where that can effect the clutch holding, getting more leverage in front of it.

[hrdtail78]

For a street bike?  I have had good luck with a 30 or 31 MDP.  I think it gives it enough to satisfy most.  That same tq of a lower ratio is also the lower ratio that is driving your engine during engine braking.  BUT I don't know if it's better.

Purpose built bikes.  Start with speed/ rpm needed to get the ET, and reverse engineer from there.