JCviggen

Did you ever weigh your car btw? To be honest over 60mph, certainly over 100mph the weight starts to matter less as it all gets to be about wind resistance. Your numbers are about the same as mine did on the stock engine and 320whp, how much to add for the weight is a big guessing game. My 2 ton barge with 440whp is only as fast 62-124 as my 850 was with 320 so the weight penalty is still significant at those speeds. Above 130 though it's no contest. If we put your car in the middle it might have been doing 380 at the front wheels, but I think it's a bit closer in weight to the 850 than to the Audi.

To be honest even with a big turbo like that there's no reason to rev far beyond 7600 with the setup you have. It's not going to make peak power at 8+ grand. It's nice for shits and giggles to rev it really high but it's hardly worth focusing on from a performance point of view. The last logs you posted I would guesstimate you were in the 330-340whp region based on acceleration times, difficult to extrapolate engine power from that with any kind of precision but it shouldn't be close to maxing out those injectors except where the available valve open time becomes really short at the very top.

I actually see your dyno info in your sig now, was that in fwd mode? If so my guesstimation would probably be close.

lookforjoe, on 29 January 2012 - 08:17 PM, said:

I can't remember, how high does FP go up for you at boost? Maybe you should get an adjustable regulator. If your injectors actually flow 710cc at 3 bar then you shouldn't hit 80% at the power levels we could guess you were making, unless we're talking about insane rpm points - if that's the case I'd rather just up the duty cycle at 8000rpm than size them specifically for that.

Well it doesn't. It changes a bit though. That's why i'm not suggesting 600.

The methanol guys use massive injectors...the others running 1000cc+ I would suspect are over 700 or planning to go there. If Hussein is staying with M4.4 I'd keep injector size as modest as possible, it's awfully picky about big injectors. I mean cars have done over 280 at the wheels with 350cc stock white Bosch injectors...320whp on my old engine was maxing out 410cc injectors. The math suggests 700cc injectors should deliver 500whp worth.