Will an n/a benefit from SAFC?
Will an n/a benefit from SAFC?
02-04-05, 12:32 PM
#2
very sleepy!!
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from what i've been told and read here is the safc will help the n/a's. they said that by leaning the mixture a lil it'll respond better. if u're gonna turbo it u'll definately need it if u cant get the standalone ems. i'll try to find the link as i have one on the way and i'm burning rich as a ****. 
02-04-05, 12:34 PM
#3
HAILERS
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You can lean out the fuel mixture and get a crisper response and gain power on the 4 grand and up range.
You can enrichen or lean out the mixture at idle for a smoother idle.
Downside: You should have a wideband 02 meter to do this, which cost BIG BUCKS., or go to a local tuner at a dyno shop to do it for you, which cost not as much BIG BUCKS for just a one time go at it, but I'd bet you'll be going back again, so the cost won't be that cheap in the long run.
Those are just personal opinion so take it for what it's worth. There are other opinions out there that are probably a hundred eithty out from that opinion. I also have an opinion about their opinions.
You can enrichen or lean out the mixture at idle for a smoother idle.
Downside: You should have a wideband 02 meter to do this, which cost BIG BUCKS., or go to a local tuner at a dyno shop to do it for you, which cost not as much BIG BUCKS for just a one time go at it, but I'd bet you'll be going back again, so the cost won't be that cheap in the long run.
Those are just personal opinion so take it for what it's worth. There are other opinions out there that are probably a hundred eithty out from that opinion. I also have an opinion about their opinions.
02-04-05, 12:42 PM
#5
Locust of the apocalypse
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Actually, SAFC's are better for N/A's than they are TII's. On a modded TII, an SAFC is just a band-aid (hey, I used one too until i quirrelled up the money for a standalone).
N/A with open exhausts and intakes tend to run dog rich, i mean like down to 10:1 A/F at wide open throttle, especially above 5K. So when the ECU is operating in closed loop mode, its using a set map to dump fuel in by Rpm and Airflow, negating the O2 sensor input. You then use the SAFC to tel the ecu that its getting less air than it actually is, and it will then add less fuel, leaning out the mix.
Put a wideband on it to tune it though... My old s5 GTU seemed to fall on its face after about 5500 after i did the exhaust and intake mods. tThe wideband told me that it was in the low tens above 55k at FWO..... I leaned mine out to about 13.0 at FWO and that really kicked her back into gear!!!
Since i went to the darkside several years ago... i don't know what the correct A/F would really be for a N/A at high RPM under FWO... maybe someone else will come up with a good number for you to shoot for.
Whatever you do, don't just start taking fuel out without checking the A/F... Pinga ping ping ping.. ya know?!
N/A with open exhausts and intakes tend to run dog rich, i mean like down to 10:1 A/F at wide open throttle, especially above 5K. So when the ECU is operating in closed loop mode, its using a set map to dump fuel in by Rpm and Airflow, negating the O2 sensor input. You then use the SAFC to tel the ecu that its getting less air than it actually is, and it will then add less fuel, leaning out the mix.
Put a wideband on it to tune it though... My old s5 GTU seemed to fall on its face after about 5500 after i did the exhaust and intake mods. tThe wideband told me that it was in the low tens above 55k at FWO..... I leaned mine out to about 13.0 at FWO and that really kicked her back into gear!!!
Since i went to the darkside several years ago... i don't know what the correct A/F would really be for a N/A at high RPM under FWO... maybe someone else will come up with a good number for you to shoot for.
Whatever you do, don't just start taking fuel out without checking the A/F... Pinga ping ping ping.. ya know?!
02-04-05, 12:46 PM
#7
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Originally Posted by hondasuck
so someone with a moded motor like a street port it would be good for?
only drawback to the SAFC with modded N/A motors is that you don't get any timing adjustment.. but rotary timing is one of those things I'd rather leave to Dr. Dave at KDR....
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02-04-05, 12:47 PM
#8
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Originally Posted by igneouss
So an SAFC can lean out as well as add fuel to the mixture?
well, let me rephrase that..... its easier to take fuel out in general
if your setup requires a LOT more fuel... you are looking at upgraded injectors, fuel system, etc, and then you have to compensate for the stock ecu being set up for the stock components as well..
Last edited by YearsOfDecay; 02-04-05 at 12:52 PM.
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