SCP doesn't really specify, but does the 5% aluminum overdrive pulley that they sell mean 5% overdrive for the early style blowers?
I searched for a thread on this, and I saw a post with diameter measurements. If their measurements were right, the SCP 5% overdrive pulley is more like 11% overdrive on my 1995. Which would explain why I peg the stock boost gauge now. I installed a double intercooler at the same time, so maybe I gained a slight amount of boost from that too (less pressure loss)
I searched for a thread on this, and I saw a post with diameter measurements. If their measurements were right, the SCP 5% overdrive pulley is more like 11% overdrive on my 1995. Which would explain why I peg the stock boost gauge now. I installed a double intercooler at the same time, so maybe I gained a slight amount of boost from that too (less pressure loss)