Fuel Pressure
staholdn
10-27-2001, 02:42 PM
I have installed a CAI, and JWT S3 cams. Do I still have the correct fuel pressure? Does the ECU correct for more air and adjust the pressure or do I need to instal a regulator? If so does the B & M Command flo fit the SR20 or do we need a different regulator (which one?). My air/fuel ratio gauge reads between lean and the top side of rich but never really rides in the rich side. I know this is o.k. but would I benefit from increasing the pressure or would this be a waste of time and money?
G-Forces
10-27-2001, 07:48 PM
No it fine don't dick around with it you'll end up fscking something up. :) The stock ECU can compensate just fine.
P10DET
10-27-2001, 10:52 PM
Originally posted by staholdn
I have installed a CAI, and JWT S3 cams. Do I still have the correct fuel pressure? Does the ECU correct for more air and adjust the pressure or do I need to instal a regulator? If so does the B & M Command flo fit the SR20 or do we need a different regulator (which one?). My air/fuel ratio gauge reads between lean and the top side of rich but never really rides in the rich side. I know this is o.k. but would I benefit from increasing the pressure or would this be a waste of time and money?
Don't waste your money. Adjusting your fuel with pressure is the ghetto way to do it. The SR20 uses a hot wire MAF and will adjust for additional airflow, unlike the MAP system in Honduhs and some other cars.
Sorry to be the one to tell you this, but air/fuel gauges are a total waste of money. They are not sensitive enough for tuning and can even screw with the ECU reading the O2 sensor.
I agree with Jason all the way.
I have installed a CAI, and JWT S3 cams. Do I still have the correct fuel pressure? Does the ECU correct for more air and adjust the pressure or do I need to instal a regulator? If so does the B & M Command flo fit the SR20 or do we need a different regulator (which one?). My air/fuel ratio gauge reads between lean and the top side of rich but never really rides in the rich side. I know this is o.k. but would I benefit from increasing the pressure or would this be a waste of time and money?
Don't waste your money. Adjusting your fuel with pressure is the ghetto way to do it. The SR20 uses a hot wire MAF and will adjust for additional airflow, unlike the MAP system in Honduhs and some other cars.
Sorry to be the one to tell you this, but air/fuel gauges are a total waste of money. They are not sensitive enough for tuning and can even screw with the ECU reading the O2 sensor.
I agree with Jason all the way.
G-Forces
10-28-2001, 09:20 AM
Well, the air/fuel meters/sensors that are worth it are HELLA expensive! I was looking at getting a 5 wire air/fuel meter...$1000. Damn I don't need it that bad.
Caribbean NISMO
10-29-2001, 04:11 PM
I installed an autometer pro-comp air fuel ratio guage and fuel pressure guage in my P11 this weekend .Whats that about the air/fuel ratio guage screwing with the cars ECU readings.
G-Forces
10-29-2001, 04:21 PM
Well if I remember correctly you need to tap into the stock O2 sensor to get the reading for the A/F meter right?
Apparently when you tap into the wiring harness with a wire you change the reading that the ecu sees...it changes slightly, enough that you probably won't notice a difference but you won't be running at peak performance. I would be better to leave the stock O2 sensors alone and buy another seperate sensor to measure a/f ratios. However the narrow band or 3 wire sensors are not very good for tuning and the 5 wire or wide band sensors are freaking expensive. :(
Apparently when you tap into the wiring harness with a wire you change the reading that the ecu sees...it changes slightly, enough that you probably won't notice a difference but you won't be running at peak performance. I would be better to leave the stock O2 sensors alone and buy another seperate sensor to measure a/f ratios. However the narrow band or 3 wire sensors are not very good for tuning and the 5 wire or wide band sensors are freaking expensive. :(
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