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Discussion Starter · #1 ·
Does anyone know what the correct belt size is that I should run with a 2.87 pulley and a 15% OD damper? Belt is for my 04 GT.
Currently I'm running a 3.33 pulley with stock damper and I'm using somewhere between 107"-108" (can't remember).

The IW 15% overdrive damper is 7.5" crank I believe. Anyone know what belt length I should be using?
 

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You don’t want to run a smaller blower pulley with an overdrive pulley. You’re going to hit like something ridiculous like 58,000 blower rpm at 6,000 engine rpm
 

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Discussion Starter · #3 ·
You don’t want to run a smaller blower pulley with an overdrive pulley. You’re going to hit like something ridiculous like 58,000 blower rpm at 6,000 engine rpm
I'm shooting for 600hp which is why I'm going with a 2.87" pulley. I'll be at 56,000 blower rpm at 6,000. The max for my V2 is 52,000 so I'll have to be careful with my shifts.

My 600hp power goal should be attainable. The engine is forged, along with blower cams and full headers and exhaust. I need to make 20psi in order to hit 600hp. If I overspin my blower, that's on me. I'm just looking for belt length suggestions or how to calculate what length I need.
 

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Discussion Starter · #5 ·
Ended up going with a 2.90" griptec pulley and the IW 15%, 7.5" overdrive pulley. Still unsure of how to calculate the necessary belt length though
 

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Ended up going with a 2.90" griptec pulley and the IW 15%, 7.5" overdrive pulley. Still unsure of how to calculate the necessary belt length though
Ended up going with a 2.90" griptec pulley and the IW 15%, 7.5" overdrive pulley. Still unsure of how to calculate the necessary belt length though
Most people will say to route a string around the pullies and measure that.
My 3.2" w/stock crank pulley used a 108", I now at a 3.2" & 10% OD with a 109" Gates RPM.
 
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