When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I have finally been test driving my TA around, but I am only seeing about 3-4 psi at 3800-4000 rpm. I sized/designed everything for about 12 psi (estimated HP at that level). With a redline of 6300 do you think I will hit it or do I need a smaller SC pulley?
7.65 Crank pulley and 4.5 SC pulley on a F1A...more engine spec and some vids in the below thread...
What is your elevation? Nevermind, I looked it up and you're close to sea level. As has been posted, you need to take it up higher to see what it will produce. The graph below was with an F-1A at 12.4 psi at redline. Bob
__________________ ATI ProCharger and Moser Sales 260 672-2076
I changed the 4.5" pulley to a 4.25" and did a couple pulls up to 5700 RPM (redline is about 6500) in second gear got 6 psi boost (again thought there was a boost problem). I thought I was getting into it, since it was pulling so hard. Came home and checked the data log it was only about 1/2 throttle! I sent the log to my tuner anyways, and he sent me an update.
I loaded the new tune and did a couple more pulls, this time REALLY pushing the fine line of doing a 1/8 mile burnout. 2nd Gear, 6400 RPM, hit the rev limiter, going 85 mph, and hit 13 psi!!!!! I thought I was going WOT, again came home and checked the data log and was ONLY 65% throttle. This thing is INSANE! Based on the base engine HP (485 FWHP), Boost level, and drive train loss it was making about 775 RWHP.
I will admit that Bob was correct, I just changed back to the 4.5" blower pulley.
I never would have thought I would say I am making too much HP!
Last edited by GrnDragon; Aug 28, 2016 at 09:05 PM.
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.
7 Most Reliable High-Performance Engines GM Has Ever Built
Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.
Pulley Size? 
