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Here's the reason why....IMO.

If you start out by a 70 to 80 HP drag/duner motor...you're not quite ready for a lockup yet...but if you get a cheapo clutch, it'll fry (actually, the clutches are usually good, they just need HD springs.)

Once you get into lockup mode...you can get by with the stockers again...
I'm running a Raptor 660 OEM clutch in mine.

Although I will say, the FAST clutch I had was bullet proof. 3 1/2 seasons on it....
 

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I ran my FAST clutch with a direct drive lockup (standard weights) with all 6HD springs.
I ran my FAST clutch with my slingshot with 3HD, 3 stock...

I run it now with an OEM Raptor clutch with 6HD springs, but they are 3 barnett, 3 other brand HD springs (they're thicker and taller than stock, but not as stiff as the Barnetts).

I also use my slingshot with both ball bearings in each groove...
Hope that helps.

Spring pressure controls lower to mid RPM hook, lockup pressure controls mid to peak RPM...
Tune your springs and lockup in by your 60 foot times. That is of course, once you experiment with gearing, paddles, air pressure, etc...
 
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