Fuel Managment Question
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S14Life
- Posts: 719
- Joined: Sat Feb 15, 2003 12:07 pm
- Car: b5 s4 stage 3, 2001 pathfinder, 91 s10
- Location: bay area
Fuel Managment Question
So I really have no experience with tuning the fuel system in cars, like the air/fuel ratio deals, like the greddy emanage and APEX'i SFAC and what-not, but I'd like to. I was wondering if the Emanage is very hard to use as a beginner or should I go with the APEX'i unit or something like that? The reason I ask is that I'm starting to buy performance **** for my SR and I'll be needed to upgrade my injectors and stuff soon and I would like to learn more about "tuning". Anyway, I know I'm a little hard to understand but I don't really know how to explainj it all. But anyway, what unit does the majority of NICO favor?
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Nismo_Freak
- Posts: 10314
- Joined: Wed Jul 24, 2002 10:42 pm
- Car: 89 Nissan 240SX
Apexi Power FC
Use a wideband 02 along with a knock meter and find an open stretch of road. Your first task is to calibrate the MAF and Injector sizing. Once that is set into the PFC, start the car and it will begin an auto-idle process. You can also correct this manually. The idle should smooth out in a few minutes.
Then you need to tune the car for light cruising loads. It's best to find a smooth flat surface of road and just cruise around. You should have a fair amount of ignition advance (increasing in RPM for the low map), with an A/F ratio of about 16:1 on off boost, light load cruising. If you wanna err on the safe side you can set your a/f to 14:1 at the cost of more fuel consumption.
Once you get the car to have a smooth transition between idle and the low map you can work on the high map. The high map is essentially your "on boost" (TPS voltage exceeds 40% usually) map. You should aim for ignition timing retarding about .75 deg's for every 1 psi of boost pressure and an A/F around 11.5:1 for the initial shake down. Once that is estabolished start working the A/F up to about the 12.5:1 area, which usually nets the best power production. On the top end you need to start creeping up the timing in the higher rpms to prevent misfiring. You might wanna step up the fuel enrichment towards 11.5:1 once you start increasing the timing. This also helps to cool the piston crowns somewhat.
Take this as advice, not as written word.
Use a wideband 02 along with a knock meter and find an open stretch of road. Your first task is to calibrate the MAF and Injector sizing. Once that is set into the PFC, start the car and it will begin an auto-idle process. You can also correct this manually. The idle should smooth out in a few minutes.
Then you need to tune the car for light cruising loads. It's best to find a smooth flat surface of road and just cruise around. You should have a fair amount of ignition advance (increasing in RPM for the low map), with an A/F ratio of about 16:1 on off boost, light load cruising. If you wanna err on the safe side you can set your a/f to 14:1 at the cost of more fuel consumption.
Once you get the car to have a smooth transition between idle and the low map you can work on the high map. The high map is essentially your "on boost" (TPS voltage exceeds 40% usually) map. You should aim for ignition timing retarding about .75 deg's for every 1 psi of boost pressure and an A/F around 11.5:1 for the initial shake down. Once that is estabolished start working the A/F up to about the 12.5:1 area, which usually nets the best power production. On the top end you need to start creeping up the timing in the higher rpms to prevent misfiring. You might wanna step up the fuel enrichment towards 11.5:1 once you start increasing the timing. This also helps to cool the piston crowns somewhat.
Take this as advice, not as written word.
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Nismo_Freak
- Posts: 10314
- Joined: Wed Jul 24, 2002 10:42 pm
- Car: 89 Nissan 240SX
Re: (S14Life)
PFC w/ Commander = $1200
and it's a plug and play unit.
Greddy Emanage = ~500 (w. all harnesses, etc.)
and you have to wire it in (read: butcher your harness, yet again)
PFC is the stronger of the two, and a more worthwhile investment.
and it's a plug and play unit.
Greddy Emanage = ~500 (w. all harnesses, etc.)
and you have to wire it in (read: butcher your harness, yet again)
PFC is the stronger of the two, and a more worthwhile investment.