S2Charlie

Okay... so I've been checking out different posts and sigs for a while; and some of the Forced induction guys have 425RWHP and 380RWTQ and some have 425RWHP and 440RWTQ. Now I know horsepower is derived from a formula that includes torque, but how are some guys getting shafted on the torque while others are breaking their driveshafts? The only thing I can think of is maybe Supercharger vs. Turbo but thats just a guess and Turbo's are pretty rare on a dual-exhaust car. Any ideas? Caue I want a Torque monster after I put on my Blower

Dex

generally you will have a higher torque number with a turbo and it will most of the time be higher than the HP numbers. Twin Screw s/c make a lot of torque as soon as you punch it and it stays kinda flat. The turbo doesnt start off with as much torque of a twin screw but it will eventually climb to a higher number. even though I may make 500tq on my turbo a 350-400 flat torque curve, i would consider a torque monster. Lots of GOO off the line for sure

make sense?

Dex

I just pulled these off google but you can see the difference

[IMG]local://upfiles/64043/FED07CF66A0E47A898888990B6C33D0B.jpg[/IMG]

[IMG]local://upfiles/64043/985F03D6F97745D18F038581F41CC77B.jpg[/IMG]

seniorsmith

Would this be true for centrifugal s/c as well? I've been seeing some pretty impressive vids on youtube with guys runningcentrifugalsthat are getting crazy acceleration. Likein this video for instance (he's running aVortech, 3.73's,and little else as far as performance mods).

http://www.youtube.com/watch?v=afcf1...eature=related

I timed his 0-60 with a stop watch and he'sUNDER 4 seconds at 451rwhp.

jahudso2

From what I have seen, most of the centrifugals make high hp and lower torque. If you want to see a perfect torque curve, look at the bmw 135 or 335 twin turbo motor. It has 300 ftlbs of torque from 1400 rpm to 5500 rpm. I test drove a 335 right after test driving a 2007 gt and the 335 made the gt feel like a honda civic. I ended up buying a GT though because the bmws cost a ton and the dealers give no rebates for them.

forensicsteve

That has been my experience. On the same dyno and operator, the Procharger P1SC at 10 lbs produced 510 rwhp and 430 rwtq. The 76mm single turbo I switched to, at 11lbs... 520 rwhp and 530 rwtq. Both were on 93 octane pump gas. I am waiting for a race tune with 116 octane and much higher boost but still expect the torque to stay close to the hp.

Local Yokel

Actually a fellow on this board and I tested this exact theory last weekend. He has the Saleen blower and I have the Vortech. We were "testing" going up a mountain and were pretty much neck and neck even though I have higher horsepower, he had me on TQ. The ultimate answer is it depends on where in the RPM band you want to make your power. I can launch pretty hard even on stock tires due to the Vortech making power in the upper RPM's. The Saleen would be a little harder to launch harddue to the instant TQ (same as a Kenne Bell, Whipple, Etc.). All forced induction is good, it just depends on your application ...

schapman

Are these off the same type of car?

Dex

No, not the same car but i was just trying to make a point on how the curves are. you'll see the same with a turbo or s/c on a 3v motor. Anyone want to post up their t/s, centri, and turbo dyno charts?

06Saleen3V

Centris usually have lower torque numbers while t/s and turbos are USUALLY close to the horsepower rating