How much boost will get you 280 at the rear wheels?
05-11-2003, 12:55 PM
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How much boost will get you 280 at the rear wheels?
I know most people are talking about 300, 325 and now 350 at the rear wheels when it comes to a turbo, but all i'm interested in is around 280. I'm trying to both keep the wear and tear on my engine down and keep my HKS exhaust. 280 is about 320 at the crank. which ain't too shabby. How much boost would it take to achieve 280 at the wheels? Also, would i benifet from tampering w/ my hks exhaust or leave it the way it is. You could make the down pipe bigger, and get a high flow cat, but would that make up for the restriction near the resonator?? Any opinions are welcome.... even if you need to flame me to get your point accross 
Oh, one last thing. I'm not just screwing around w/ the idea, i've pretty much already got everything lined up w/ my local shop, and they are going to begin a custom turbo in the very near future. So far its a speedcraft log style manifold, turbontics turbo, spearco intercooler, and all greddy gauges, controllers, and timers. Anyhow, some opinions
Brandon
Oh, one last thing. I'm not just screwing around w/ the idea, i've pretty much already got everything lined up w/ my local shop, and they are going to begin a custom turbo in the very near future. So far its a speedcraft log style manifold, turbontics turbo, spearco intercooler, and all greddy gauges, controllers, and timers. Anyhow, some opinions
Brandon
05-11-2003, 03:46 PM
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5-6 PSI would probably get you around there, comfortably (maybe 290?). Some people are estimating 15-20 hp per PSI, up to 10 psi or so, where it (possibly) drops off to about 10-15 hp per PSI.
05-12-2003, 09:41 AM
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Don't listen to him... he doesn't know ANYTHING about turbos. I would guess about 6 psi but it really depends on the turbo set up. My car did somewhere between 290 and 300 RWHP at 6 psi with the Speedcraft set up.
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05-15-2003, 05:48 AM
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Here's an easy way to calculate it yourself...
A 14.7 PSI increase will mean a doubling of power, so 480 hp at the crank. We lose about 17% through the drivetrain (240 hp at the crank down to 200 hp at the wheels), so if you want 280 at the wheels, you need about 335 at the crank. 335 is a 40% increase, so you need about 5.9 psi (0.4 bar) of boost to accomplish that.
Granted, don't forget that 6 psi is at the TB, so if you're running with an intercooler or other such power draining device, take that into account.
A 14.7 PSI increase will mean a doubling of power, so 480 hp at the crank. We lose about 17% through the drivetrain (240 hp at the crank down to 200 hp at the wheels), so if you want 280 at the wheels, you need about 335 at the crank. 335 is a 40% increase, so you need about 5.9 psi (0.4 bar) of boost to accomplish that.
Granted, don't forget that 6 psi is at the TB, so if you're running with an intercooler or other such power draining device, take that into account.
05-15-2003, 06:05 AM
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Originally posted by MacGyver
Here's an easy way to calculate it yourself...
Granted, don't forget that 6 psi is at the TB, so if you're running with an intercooler or other such power draining device, take that into account.
Here's an easy way to calculate it yourself...
Granted, don't forget that 6 psi is at the TB, so if you're running with an intercooler or other such power draining device, take that into account.
Technically that would make a 2 bar (28psi) F20C a 720 HP at the crank monster, ~650? at the wheels? Yikes. I only say this because I'm a few weeks away from 2 bar and I doubt I'll be hitting 650 at the wheels.