Gabe he is talking about whp, what shop hemi quoted him "to the tires". I agree, the quoted #s are a bit high. Arringtons uses a Superflow dyno and is known to read high as compared to other dynos. Im not posting to be negative but to be rational. Ive been to Arringtons and wouldnt hesitate to go back for more work, the experience was all positive. Ive also been to HHPracing to do a custom dyno also. The #s doesnt add up between the two and it rarely does.. but its definitely a difference on the street which is where it really counts
I pulled this off the other forum to share, and theres countless other good reads also..you can take it for what it is.. but good info regardless on different types of superchargers. Its about an enthusiast to have claimed to have gained 550whp at 6psi with a procharger kit on a stock 6.1 motor, questioning why HHPracing only gets 568 whp with same procharger kit with stage 11 heads and a cam.
Paul, it's how you take it into context. I hate to be one of these guys who tells someone there hp numbers aren't correct but your 550 rwhp car would only make 500 rwhp on our dyno - I can say this as I've probably tuned more ProCharged HEMI's than anyone else out there and 6 psi on a stock SRT-8, no matter whether you have full exhaust or stock exhaust, only makes 500 rwhp give or take 5 hp on our dynojets. Don't get me wrong, I've tuned on Superflo's and other "high number" manufacturers of dyno's and made more hp, but the cars didn't make more hp, the dyno did. Both of our 2011 race cars are sponsored by ProCharger so I have tons of experience with these units and ProCharger trusts us in our abilities enough to carry their name on our cars which are designed to hit the track with 1300hp and 1600hp thanks to their awesome products. Shameless product plug: Go Procharger!
Putting it all in to context, on these single roller dynojets that we use, on stock motors a ProCharger which has lower ait's and less rotational drag (i.e. wastes less hp just to spin it) make 500rwhp. A Kenne Bell at 6psi makes about 460 to 480 rwhp. A Magnacharger at 6psi makes about 440 to 460 rwhp. These numbers are on our dyno, though our competitors put these on dyno's that show higher numbers and sell you kits based off these inflated numbers. I believe our numbers are more correct because our cars run the time at the track matching up to the numbers we put down. Here's how I justify it, Paul, at full weight (no weight reduction) at 550rwhp you should run 11.2 or in the quarter mile with a ProCharger - do you think that's possible with only 6psi at full weight on a 70 degree day?
Here's how I interpret the numbers. Our Stage 2 HHP/BES heads and cam packages add around 100 horsepower give or take. Taking a build with a blower that typically puts down 440 to 460 rwhp at 8psi, adding two psi to that for another 20hp, adding in heads and cam for an extra 100 horsepower, tuning it up safe for reliability, I think we're good to go when we see 568 rwhp. That's right where I would expect to see it on our dynojets.
Paul, I hope you don't think I'm attacking you in any way and I hope it didn't come off that way. It just allowed for me to do a really good comparison to show how we got our numbers and how to compare them to a lot of numbers our competitors throw out there. These forums are inundated with lots of bad info and it's extremely hard for anyone to do an apples to apples comparison without seeing more of the big picture.