Join Date: Feb 2011
Thanked 46 Times in 43 Posts
Point of reference on a bone stock 6.1 and vortech with corsa car back, I swapped to the 30T, and picked up enough knock that once retuned I ended up literally at square one,
I raced my brothers bone stock vortech and corsa and we were literally dead even time and time again. Timing had to go from 13 or so down to 10, erased all gains. Boost in cold temps was cracking 11psi at 6400rpms, 9.5lbs now that it's hot.
I strongly recommend a flow adder mod with any more boost on the vortech, like a cam or headers or both, keep the boost below 10 an you'll see a good gain.
Or do what I did...get some meth. 50/50 mix and I'm at 9.5psi an 14* of timing. Took 3/10s off my 0-60, so I'm guessing 50-75whp added net. If u go this route don't cheap out, I have a failsafe system, lots o warnings built in. I'm looking for a good solenoid to open the bypass if flow failsafe is triggered as well.
Summary: don't just swap the pulley, you'll just end up tuning back to square one.
PWR Forged 371, FR-223 Cam, OBX catless headers, Corsa Catback, Paramount Trans/Convertor, Johan Special Sauce