car's running pretty rich. If you notice on my third run where the a/f was a bit more lean, it made the most power. Looks like with a V-AFC, it well certainly(like other's have shown) make some more power. The car just made more power through out the entire range. I was told that 13-13.5:1 would be probably ok to run. Now I really want a VAFC. There's probably about another 5-8hp to be had across the entire range.

Car has exhaust, but we know it doesn't make power... so to me it might as well have been stock exhaust.

BTW, it was 90 degrees out there today. Yuck. There was another S2K chart that they showed me that was dyno'd in very early april, there was atleast a 20 degree temp diff. It's peak hp was only ~2-3 more than my chart. That car that said got new plugs and Royal Purple Racing 21 oil change right before the run. They say that this stuff actually make more hp, dyno proven... but since I haven't actually seen it myself... who knows.

-shing

 

Here are the numbers:




-Shing

 

How much the dyno at Carboy man?

 

$65 for 3 runs. Not too bad... I need to get a VAFC.

-Shing

 

Boy that sure is rich!!! RICH, RICH, RICH...

Most NA motors seem to like to be leaner than that at peak torque and then even leaner (but still very rich) as revs rise to peak HP. Past peak HP many motors like additional richness but not always. Perhaps Honda did this as a safety/longevity thing. Protect the exhaust valves or whatever. This won't affect emmisions ratings BTW since WOT is exempt from the smog laws since they assume that most of the time you are at steady cruise speeds. If you do lean out the car it will probaly be okay on the street longevity wise as long as you keep the injectors clean. I'd be more concerned about exhaust valve heat if you do 20-25 minute open track events in hot weather all the time. An EGT gage would be nice to hook up while you are dialing things in to make sure things don't go haywire. I wouldn't be at all surprised to see you pick up the amount of HP that you mentioned.

 

VAFC would be beneficial. A possible explanation is that the stock fpr is low with the ecu compensating by increasing fuel thoughout the rpm range. My car seemed to run rich when my adjustable fpr was dialed low; the power did increase throughout the power curve after I cranked the fuel pressure higher.

 

I think someone mentioned before that the stock FPR can vary +/- 5%? This could probably account for the fact that some cars make more dyno hp than other's. I'd bet that if we got a guage on it, most of the cars that made more HP would probably have a leaner mixture.

I think this could also explain why my exhaust is nice and dark... typical rich condition.

Assuming ideal/fixed fuel pressure, is it possible to say how much hp can be gained/lost per percentage point?

thanks,
-Shing

 

Shing, I went from max torque,hp of 129.9,196.5 to 137,201.5 by increasing the fuel pressure from 43 to 49.

 

Was your car running lean then?

-Shing

 

Shing, I don't know if it was running lean. I think still a little rich. The 49 is in lower spec range and the pipes still get a little sooty, although much much less than before.