what is the max boost for a 112hh,before you start to over spin it.

 

Depends what engine it's on, mods, etc.

 

555ci = 1 psi.

 

I would think bone stock bottom end with cam.. injectors and fuel pump

 

Dom - The 6 rib belt system is going to limit the Inlet Forward/Rear Drive 112HH to around 10-12 psi before slippage due to the belt stretching. I have not tried turning one up past 10 psi to see what else we could get out of it. I know of several with this design running 10 psi no problems on stock displacement and compression LS2's.

 

leftcoast32: sorry to post thing that meybe dont belong to the thread, but what do you think a mp122 will do on a 6.0 engine, lets say it it bone stock

 

The biggest limiting factor will be the 6 rib pulley system above 10 psi on any of the systems. An 8 rib pulley system will bring that out because the belt will not stretch and slip as much.

The Truck Radix 122HH will do around 10 psi on a stock 6.0 with 6 rib pulley's.

The Inlet Forward 122HH will be good to higher boost levels because the rear drive can be underdriven, 1 to 1 or overdriven depending on application.

 

Efficiency wise I'd try to stay at 10psi and under. 10psi with 10:1 compression in your 6.0L and the right cam should get you the times you ran with the nitrous without having to use it as long as you can keep the blower cool enough. You can probably spin that fast enough to get 12-14psi out of it, but I'm not sure how much you'd gain at the track itself. It would dyno well, but probably run hot after the 1/8th mile.