A 2.75 pulley should be way more than 10lbs, A 3.0 pulley should give you 10lbs. A 2.75 more like 12-13lbs.

 

and a 2.75 is a heat generator as well.

onyx, then mine works.

whoop, how do you know what the finish temp is if you don't know the start? and you said thrid pass...did you have 209 on the 2 passes? back to back runs? cool down period?

 

i found out when i went and got a street retune with allen nelson and the temps were climbing high fast and on allens laptop when i finished the pass for the tune top end came out at 209

 

well the pulley that i have at first i thought it was a 3.0 but then i measured it with a digital caliper from the inner threads where the pulley belt sits on and measured 2.752 and i have the stock one that said on the pulley 3.1 ingraved and measured it with the caliper and read 3.10. and on the machanical boost gauge it reads a little over 11lb's with the 2.75

 

I think you may have more success running less boost and more timing. That has been my experience so far. Even when i tried the 3.0 pulley, I just created hot air and couldnt run any timing to justify running more boost. Had more success with the 3.25 pulley.

I think with a 3.o pulley, meth, and a good tune, you will make some great power more safely. Try not to get got up in the more boost is better mindset. Remember, boost is a measurement of restriction, not air flow.

I will be going with a 3.1 with the 6.0 and running as much timing as possible. I dont want to work the supercharger to hard and create a whole bunch of heat. Most say, anything more than a 2.9 is a level of diminishing returns.

 

I agree with j's01, in reality more boost is does not equate to more power. We saw the same thing on the STS kit, once you start getting up near the max efficiency range the computer just pulled more timing and made the truck feel sluggish. 100% meth did the trick for one of the guys ( 50/50 did not do much ).
I saw an article on the GTO Radix kit, the rag saw massive heat soak after only 2 runs that took the 1/4 top speeds and ET's waaaay down. Other posts suggest using the larger exchanger to better cope with the increased heat ( not sure if you have it ).
Either way it was a good catch on the tuning side. Good luck in your troubleshooting, let us know the outcome!

 

well i put the 3.10 pulley see what it does. my times were 60ft 1.79 and 1/4mile was 13.59 at 97mph at 90* weather with the 2.75 pulley on