I went from a 3.0 pulley @ 7psi to a 2.9 pulley and still 7psi. What gives, I thought i would have gained atleast 1psi. Does anyone have some insite on this.
Thanks

 

Is your crank pinned? Are you getting belt slip?

 

Yes crank is pinned. As far as belt slipage i really dont think so. I havent seen any belt residue any where, so i dont think so.

 

Did you do any other mods along with the pulley change?

 

did u get a smaller belt

 

No other mods done. and a new gatorback belt. I will have to look at the number but it has 115 in it.

 

I just went for a spin and looked at my boost guage. When i punch it, it goes to 7# and as the the engine revs around 5000 the boost get to 8#. Does that sound about right or should it hit 8# as soon as I punch it.

 

are u still runnin the stock throttle body? if so, would consider the 90mm upgrade to let the blower breathe. a mp112 radix, like similar blowers has to suck air thru the tb which becomes the restriction. opening that up will help it build more boost. also remember the faster you spin the blower, the more heat it will build. that could be offsetting the added boost you thought you would get. hope this give you some ideas

 

when i had thats radix mp112 i had the 2.8 and was makin 7lbs on my 6.0 with cam and dual exhaust

 

Yes I am still running the stock TB. Right now I dont want to do anything else since my injectors are maxed out. I will be getting a dyno tune by Jeremy Formato on Sat. and I will go from there. Either way before the TB I have to get injectors to keep on growing with the added parts to come.