Exactly that. But the 450 was at 13.8 and at 8000rpm.

 

It's not very likely a log manifold would even come close to that on 10 psi because they aren't very efficient manifolds.

Also, I'd like to see that dyno of the Full Race doing 450 whp on 11 psi. It's probably more around 410 on 11 psi. I believe Fperra's setup is Full Race and he did 502 whp at around 16 psi and that's with a built head.

 

Just for a referance to timing. I'm running 8psi right now. Before I had it tuned, I was running my old supercharger map, which had max timing of 17.5 degrees. That with a af of 12:1 made 291HP. After my tune, I was running 11.5:1 AF with 20 degrees of timing. Adding that 2.5 degrees netted me 19HP for a max of 310hp. Now if I was to lean it out a bit and run say 12-12.5:1, I would probably get another 5-10hp but I like to live on the safe side. And FYI, 20 degrees is a lot of timing for a FI F20c.

I'm not going to call BS on this thread though. This is an example of why not...

He claims 400hp at 10psi. I have 310hp on 8psi. If he is running on a dyno pack add 10% to my dyno I'm now at 340ish. The two extra psi, now I'd be sitting at 370ish. How lean is the car running? If it's at 12.5:1 add another 10 to 15, putting me at 385ish. How's the weather? If the air is dense and cold, add another 10-15 over what I originally dynoed at (Mine 310 was made on a 95* day in FL). That's over 400 now. There are so many factors in dynoing a car that you can't really call someone out just because the numbers sound high.

 

run conditions were 69.59F at 10pm at night

the air fuel ratio is 11.7-11.8

also, as arnold said, we worked off of aa 10lb spring, soo the psi levels could have been anywhere from 10-12psi

I have a girl stopping by later so she can take the dyno sheet home with her to scan it.

I'm not trying to proove any points or shut people down, just thought i would post some numbers that we achieved. I didn't think it would cause so much drama. I kinda regret even making this post now but i'm not a mod and i can't delete it. All i can say is the car is fast, twice as fast as it was s/c with a much better power powerband

 

OOOPS. You got it there SPOOLIN. It was 448 at 13.8psi and at around 8000rpm. They did not take the car to 9000. I will have new dyno numbers to throw around in about a week and they will be at 8psi and at 11psi. Sorry for the confusion.


-Chris

 

I disagree with this. The F20c can safely take a lot of timing. More than most engines. I'm running 28 degrees at 8 psi and 21 @ 16 psi.

I don't think anyone doubts that he made 400+ whp on a dynojet. What everyone doubts is that he made it at 10psi. No boost gauge and no datalog, who knows what the psi is. Running a 10 pound spring doesn't mean 10 psi. How accurate is the spring, and how much boost creep was there? The only real way to measure the psi level is with a datalog. Boost gauges are not that accurate (+ or - a couple of psi).

 

I meant to say that 20* is alot for a stock compression motor. At 9:1 you can run more timing with less chance of detination.

 

I made 315 at 6.6 psi on a Comptech SC. With 9.4 I made 370 at 7,400 rpms. If you kept the curve going it would of hit somewhere around 400hp by 8,100 at approx 10.6psi. I had map sensor issues and could not take it any higher as we all know the stock map sensor cuts out at like 10.2.

 

I agree with Fperra,

I think it can be done, what I don't think is that it was 10 pounds. Just because it was a 12 pounds spring doesn't mean thats what it was. I have a 8 pound spring from Cody on my Lovefab kit, and the car see's 9.5 pound spikes at times when I run open Downpipe. I am guessing that he is seeing atleast 12 pounds, and that his timing is VERY aggressive.

Also the gauge you use is important. My buddy's Autometer said I was running just shy of 8 pounds. I have another gauge I hooked up that said it ran a little over 8 all the way. Now I have the Defi BF imperials, and that thing reacts so fast you can see the little spikes of all of .5 of a pound you could never see before, and while the car is usually at just a hair over 8 when the exhaust is hooked up, the car can spike to over 9 if the exhaust is unhooked.

SO ANYWAY. Like Fperra said, untill I see a dyno, or log I am guessing he is seeing atleast 12 pounds of mani pressure.

J. R.

 

I highly doubt it.