How about don't believe it don't post in it. Or if you wanna bet to see if it is true or not send money or know someone in Illinois send them my way. This is my post it was clean until some babies got mad I got more power. There are soo many faster S2Ks out there go have fun with their posts.

James D.

 

I'm getting dizzy trying to decipher some of these posts

 

We're not being babies.........We're telling you it is not possible to make those kind of numbers on 7 psi and if you take it somewhere else to get dyno'ed you will see that.

550cc injectors can't even flow enough fuel to support 400 whp.

 

I dont want to get too deep into this as I am skeptical also. But the civic guys with swaps are using the dsm blue top injectors, 440s I belive and are making350-375 at the wheels, I do not see how 550 wouldnt make 400 whp. I mean they would have to absolutely be maxed out, but its possible.

Maybe instead or lowering the compression he raised it and is running 6 psi on 13.5:1 compression.

 

Let me see here, stock injectors (360 cc) are good for a little over 300 whp. 550cc is 153% greater than 360, so 153% of, say 310 whp is 471 whp. And you can always increase the flow rating by increasing the baseline pressure.

Lets assume his baseline whp is 210 (2.2L at stock compression). So at 7 psi he is making 392 whp which equates to 26 whp per psi of boost. Thats definitely do-able with a full race manifold and 550 cc injectors. So whats all the fuss about? The dyno could have been reading slightly high, but, if so, not by much.

 

If he would have said it was at 9 or 10 psi with 650 or higher injectors then it would be believeable.

If you do the calculation he would need 95% duty cycle at about 85 psi fuel pressure to achieve those numbers with 550cc injectors and that is very very unsafe and unstable and those injectors will give up in no time. Remember you have to do the calculations with crank hp not whp. So........if he made 392 whp, thats about 470 crank with the 20% increase.

 

fperra...does a 3071 flow enough air at 7 psi to make that kind of power? Looking at the map on ATP's website I don't see that turbo flowing more than 35 cfm at a pressure ratio of around 1.6. On the other hand, the car in the video rips through whatever gear it's in very fast which would lead me to believe it's making very good power. With all the info given, it's just hard to make it all add up. In the end I don't care. I would be curious to see what that car traps in the 1/4 mile. I would think it should be over 115 mph given the power claimed.

 

That's another key factor for such low boost.........that turbo doesn't flow enough at that low of boost.

 

Whether its safe or not is for a different discussion. Whether you can make 392 whp on 550 cc injectors, I think you can. I believe someone on this board made 322 whp on stock, 360 cc injectors. Maybe that was at 100 % duty cycle, and maybe the 392 whp was at 100 % duty cycle. That too is for a different discussion. I have no reason to doubt his posted numbers. When someone takes his car to have it tuned and dyno'd, there is no reason to doubt the print out. Maybe the dyno is off a little, but variations from dyno to dyno are to be expected.

 

I don