Well I finally installed the 2.75 pulley onto the KB and it rocks at 10-12lbs boost. The truck is pulling real hard and 0-60 is starting to get into the low 4's. I have one more pulley - the 2.5 might put me right at 4.0. Any thoughts on belt slip. Has anyone used a 2.5 pulley on their blower.

 

i gotta comment....................im f'in jealous....lol

 

There is someone on the SSS board running a small pulley on his KB. His IAT's climb as fast as his speedometer.

 

Damn I would love to change my pulley BUT it will void my damn 75K warranty

 

That is where a custom FMIC comes into play, and I may be wrong but I believe you are refering to Justin Lamana ( not sure about the spelling) who is not intercooled.

 

I have a 5.3 supercharged Joe gibbs Silverado and it has a 75K warranty I have all the bolt ons, custom tune "Nelsons Perfromance" and next week I will add the Meth kit.

 

That is correct. The downside to that isn't just the temps, it's the fact that it's only happening because the blower is way out of it's efficiency range. The intercooler is a big help though, I agree.

 

True, I havent actually sat down to figure out what size pulley would max out the RPM on mine. I am running lower boost then V-Bond and shifting about the same or a tad lower so.. I am limited at this point by my injectors.

 

My IAT's use to climb fast before the FMIC. I attached a shot of my 0-70 run, on the 10 lb pulley and the IAT's are 84F average!!! At this point I need a set of higher flowing heads and there might be a possibility of being in the 11s with the 15lb pulley. Justin ran a 12.24 on less boost with the high flow heads.

 

Well its been 1 week on the 2.75 pulley as a daily driver. I noticed that at Idle, Im losing vacuum as the blower is pushing air into the intake. At 35% throttle Im always in boost. at WOT there is 12lbs. How long will good fortune last?