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I aways have my MAF hole to the outside of the bend. I didnt test if clocking had an effect.
If your motor is running 14:1 at WOT, thats real dangerous and it could blow up with extended hard driving. 13.3 for just a little bit of the powerband is the leanest I would run and thats right on the edge.
Mike
My last dyno was 14.0:1 at the lower rpms and stayed solid at about 13.5:1 up top. I'm not sure it's really that lean though, I'm wondering if their probe was slightly out of adjustment as everyone else with the JWT VE program has been rich? This link shows my a/f ratio, that's with a test pipe and a probe in the tailpipe. http://www.g20.net/gallery/data/500/11vedyno.jpg
Should I grab one of the NISMO AFPR's from work and richen it up a few psi? I haven't had any pinging or anything?
This does make sense Mike. This would explain why our Red B14 ran so lean with a HS intake and JWT pop (only top half installed) with C1 cams. I am waiting for the ECU to come in to try again and see how it runs (maxima maf this time too).
If your motor is running 14:1 at WOT, thats real dangerous and it could blow up with extended hard driving. 13.3 for just a little bit of the powerband is the leanest I would run and thats right on the edge.
My last dyno was 14.0:1 at the lower rpms and stayed solid at about 13.5:1 up top. I'm not sure it's really that lean though, I'm wondering if their probe was slightly out of adjustment as everyone else with the JWT VE program has been rich? This link shows my a/f ratio, that's with a test pipe and a probe in the tailpipe. http://www.g20.net/gallery/data/500/11vedyno.jpg
Should I grab one of the NISMO AFPR's from work and richen it up a few psi? I haven't had any pinging or anything?
Yeah, you can't trust what the dynojet A/F meter tells you. No matter what everyone says, its not a ture wideband.
so 14.0 is running lean or rich? and any suggestion on which fpr to get?
Super lean for wide open throttle high load conditions. But your readings are probly from the dyno jet and not accurate.
SR20's with stock compression make the best power at 13.2:1 or so. This does not give you much safety margin. High compression SR's seem to like about 12.7:1 or so and hardly gain anything when you lean them out.
so 14.0 is running lean or rich? and any suggestion on which fpr to get?
Yes, you are running very lean. I'm surprised the shop didn't warn you of this. Get the Nismo Adjustable Fuel Pressure Regulator. Its a direct replacemnt for your stock one but it's adjustable. You need to raise the Fuel pressure. Better yet you could buy an apexi SAFC and have it tuned all across the board. the nismo will help for sure though. You can get it from MossyNissan.
Super lean for wide open throttle high load conditions. But your readings are probly from the dyno jet and not accurate.
SR20's with stock compression make the best power at 13.2:1 or so. This does not give you much safety margin. High compression SR's seem to like about 12.7:1 or so and hardly gain anything when you lean them out.
Mike
Quote:
Originally Posted by 97SE-R C2
Yes, you are running very lean. I'm surprised the shop didn't warn you of this. Get the Nismo Adjustable Fuel Pressure Regulator. Its a direct replacemnt for your stock one but it's adjustable. You need to raise the Fuel pressure. Better yet you could buy an apexi SAFC and have it tuned all across the board. the nismo will help for sure though. You can get it from MossyNissan.
How will i know about the right figure like the 13.2:1 Will the FPR have a guage that i would be able to read it from ? Should I still buy this FPR if I buy a CAI... wouldnt the CAI help the engine run a richer?
I currently have the AEM intake. I also have my battery under the passenger seat, so I noticed there is alot of room to make a straighter, shorter intake. I plan on making one as illustrated. What do you think of this Mike? Given that the rest of the setup includes HS gen 5 (6 if they make one) 10:1 JDM with a ported head and S4s
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So, is this saying the fuel map doesn't extend properly into this operating region or are the injectors a wee bit undersized, or what? Looks like I'll be eating some crow on this one. I've always pooh-poohed FPRs on mild cars.
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1990 Acura Legend LS, stock (so far)
1994 Nissan Sentra SE-R (original owner) w/ $tuff, converting to ITA (even more $tuff)
1998 Suzuki Bandit1200S w/ $tuff, W.W.B.O.C. #101
2002 Dodge Dakota tow beast, stock! RIP swwwinger
I currently have the AEM intake. I also have my battery under the passenger seat, so I noticed there is alot of room to make a straighter, shorter intake. I plan on making one as illustrated. What do you think of this Mike? Given that the rest of the setup includes HS gen 5 (6 if they make one) 10:1 JDM with a ported head and S4s
Short should have better top end, make it 3" and check to see the effect on the A/F ratio.
Here is my last Dyno.... 
