A/F Adjustment by VAFC or Fuel Pressure....Which is the safe and proper way.
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Honda-Tech Member
Joined: Feb 2004
Posts: 335
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From: Guam, USA, USA
A/F Adjustment by VAFC or Fuel Pressure....Which is the safe and proper way.
Ok, got an Innovate wideband hooked up and reading in the 11's in A/F.
Running a B16B, Toda A Cams, 2 ply head gasket, Toda header, Skunk2 IM, 65mm TB, AEM fuel rail, AEm regulator, Stock Type R injectors, Holley 255lph fuel pump, rechipped P28 ecu (JUN programming) and all the other bolt-on listed in my signature.
First of all don't remember the stock size of the JDM '98spec+ Type R engine, 240cc, 270cc or 290cc. Which is it? Too many numbers on HT.
Fuel pressure set at 48psi, with vacuum off. Timing at 16 degrees. Running very rich. I have a field vtec controller and have to set it at -20% to get about 13.8:1 A/F at idle.
Now it may not be the best to use the vtec controller to reduce A/F using high percentage deduction so I decided to lower the pressure.
Now I set it at 40psi with vacuum off and with about -11% on idle I get about 12.8-13.1 A/F.
Is it safe to go lower than 40psi on the regulator setting to like 35psi? I want to try and get better A/F without reducing so much percentage on the vtec controller. But I don't want to not have enough fuel pressure either.
The field vtec controller only can be adjusted in 1,000 rpm increments and for daily driving I just set it to around 13.1 for now.
1,000 = -11%
2,000 = -9%
3,000 = -9%
4,000 = -9%
Vtec engages at 5,400 rpm.
5,000 = -7%
6,000 = -7%
7,000 = -7%
8,000 = -7%
I have not pushed the car into the 5,000 rpm range yet. Want to find out if it would be safe to run the pressure around 35psi to 38 psi with vacuum off first. Don't want to cause and unnecessary problems.
Thanks for you inputs.
I want to try and get the best setting with what I have right now.
Running a B16B, Toda A Cams, 2 ply head gasket, Toda header, Skunk2 IM, 65mm TB, AEM fuel rail, AEm regulator, Stock Type R injectors, Holley 255lph fuel pump, rechipped P28 ecu (JUN programming) and all the other bolt-on listed in my signature.
First of all don't remember the stock size of the JDM '98spec+ Type R engine, 240cc, 270cc or 290cc. Which is it? Too many numbers on HT.
Fuel pressure set at 48psi, with vacuum off. Timing at 16 degrees. Running very rich. I have a field vtec controller and have to set it at -20% to get about 13.8:1 A/F at idle.
Now it may not be the best to use the vtec controller to reduce A/F using high percentage deduction so I decided to lower the pressure.
Now I set it at 40psi with vacuum off and with about -11% on idle I get about 12.8-13.1 A/F.
Is it safe to go lower than 40psi on the regulator setting to like 35psi? I want to try and get better A/F without reducing so much percentage on the vtec controller. But I don't want to not have enough fuel pressure either.
The field vtec controller only can be adjusted in 1,000 rpm increments and for daily driving I just set it to around 13.1 for now.
1,000 = -11%
2,000 = -9%
3,000 = -9%
4,000 = -9%
Vtec engages at 5,400 rpm.
5,000 = -7%
6,000 = -7%
7,000 = -7%
8,000 = -7%
I have not pushed the car into the 5,000 rpm range yet. Want to find out if it would be safe to run the pressure around 35psi to 38 psi with vacuum off first. Don't want to cause and unnecessary problems.
Thanks for you inputs.
I want to try and get the best setting with what I have right now.
Re: A/F Adjustment by VAFC or Fuel Pressure....Which is the safe and proper way. (DEMNTD1)
What basemap are you running on your ecu ?
It sounds like it is dumping too much fuel.
My advice, sell the afc, run crome, uberdata or hondata to tune your car
It sounds like it is dumping too much fuel.
My advice, sell the afc, run crome, uberdata or hondata to tune your car
Thread Starter
Honda-Tech Member
Joined: Feb 2004
Posts: 335
Likes: 0
From: Guam, USA, USA
Re: A/F Adjustment by VAFC or Fuel Pressure....Which is the safe and proper way. (mtber)
Yeah, I just inquired on a ecu from you. Via email. Signature should be same as my current setup info. Also building the 1.8L right now and should be done end of August or early September.
Crome, Uberdata, Hondata, AEM, etc. etc. etc. all sound great, but where I live on an island, we don't have any 1) tuners 2) shops 3) dyno. We did have a dyno, but not operational at this time, hopefully within the year it should be, I hope.
Currently just using a Innovate wideband to set A/F.
Got a rechipped ecu with JUN program.
Running a B16B right now, so i was planning on setting fuel pressure to 38psi no vacuum and additionally use the VAFC for A/F tuning.
Crome, Uberdata, Hondata, AEM, etc. etc. etc. all sound great, but where I live on an island, we don't have any 1) tuners 2) shops 3) dyno. We did have a dyno, but not operational at this time, hopefully within the year it should be, I hope.
Currently just using a Innovate wideband to set A/F.
Got a rechipped ecu with JUN program.
Running a B16B right now, so i was planning on setting fuel pressure to 38psi no vacuum and additionally use the VAFC for A/F tuning.
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