Super AFC Tuning safc for n/a gas mileage
06-07-08, 11:53 PM
#26
1)Depends if you have a heavy foot or a light foot.
2)Because you are going to suck in more air and tell the TPS if you are WOT or just a tad on the throttle.
3)The % is for the low map while if you go over 50% you go in high map.
4)Yes you should, because for MPG to go up you want to be lightly on the throttle vs WOT the whole time and waste gas. 2 different maps low and high. I think of it as cruising for mpg or fast driving. (But thats why they give you 2 files to choose for afc2)
5)If you want mpg you want to tune during cruising. But if you want to make a better map for spirited driving then tune for WOT. Its because its 2 different modes. Normal and WOT.
Anyone correct me if I am wrong.
I have an s5 n/a, The highest % I have for taking away fuel is -10% I am making more power just by feeling. But afr are the best way to actually tune the engine with the afc.
2)Because you are going to suck in more air and tell the TPS if you are WOT or just a tad on the throttle.
3)The % is for the low map while if you go over 50% you go in high map.
4)Yes you should, because for MPG to go up you want to be lightly on the throttle vs WOT the whole time and waste gas. 2 different maps low and high. I think of it as cruising for mpg or fast driving. (But thats why they give you 2 files to choose for afc2)
5)If you want mpg you want to tune during cruising. But if you want to make a better map for spirited driving then tune for WOT. Its because its 2 different modes. Normal and WOT.
Anyone correct me if I am wrong.
I have an s5 n/a, The highest % I have for taking away fuel is -10% I am making more power just by feeling. But afr are the best way to actually tune the engine with the afc.
06-08-08, 10:56 AM
#27
Turbo Waggin
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My car is an s4.. and because of that ( having only 1 wide band TPS) the AFC picks up 100% throttle.. about 99% of the time.. there is no cruising at 30% for example.. foot on the gas means 100% throttle. LOL... That said..
1) where should it change over? IMO at 1%.. then theres no reason to mess with the lo- map.. ( except for idle) One map to look at makes it even easier.
2) ... ^
3) ..........^
4) ...............^
5) Shouldn't, in reality, the 2 fuel maps be quite similar.. ( you always hear this: a leaner afr will make your car faster.. AND.... a leaner afr will give you less fuel consumption because its economizing the fuel )
Problem with tuning the afrs to cruising, is that if you ever watch the wideband, WOT AFR's are always lower then cruising afrs.. So if i tune to cruising, and then go WOT.. the wideband shows the AFRs a lot higher then what i want.. almost into dangerous levels.. This is why tuning to WOT makes sense to ME.. that way, i never go over a dangerous AFR #
Funny how dependent the way a person tunes is based on s4 vs s5.. seems to make a huge difference.. But this is all my own logic... so it could be way off.
1) where should it change over? IMO at 1%.. then theres no reason to mess with the lo- map.. ( except for idle) One map to look at makes it even easier.
2) ... ^
3) ..........^
4) ...............^
5) Shouldn't, in reality, the 2 fuel maps be quite similar.. ( you always hear this: a leaner afr will make your car faster.. AND.... a leaner afr will give you less fuel consumption because its economizing the fuel )
Problem with tuning the afrs to cruising, is that if you ever watch the wideband, WOT AFR's are always lower then cruising afrs.. So if i tune to cruising, and then go WOT.. the wideband shows the AFRs a lot higher then what i want.. almost into dangerous levels.. This is why tuning to WOT makes sense to ME.. that way, i never go over a dangerous AFR #
Funny how dependent the way a person tunes is based on s4 vs s5.. seems to make a huge difference.. But this is all my own logic... so it could be way off.
06-09-08, 09:36 AM
#29
Turbo Waggin
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Im pretty sure thats just how the s4 tps works... if you've ever tried to adjust the tps on an s4.. you'd see that 1/4 turn of the cable linkage puts the tps at fully open. then you can keep turning a whole lot more. Weird, and gay.. but true.
zany huh? LOL..
05-20-09, 12:50 PM
#32
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I will provide a small success story for the SAFC users.
Have an 83 with an 89 n/a engine, full RB long primaries exhaust.
Installed the SAFC-II last fall, finally am driving it enough to get some results. I don't have a wideband so I'm just tuning by feel, and I wired the O2 sensor into the SAFC-II. Points of interest:
Cruising:
I set the low throttle to ~53% as that number is only exceeded on steep hills during cruising. Normal cruising for me is between 35-50%. Pulled out around 20-30% fuel throughout the cruising band (2-5k rpm). Fuel mileage has gone from 24-29 Imperial MPG.
WOT
High throttle maps starts around 65%. Harder to tune with only O2 sensor, really need a wideband. But couple things, can't take away fuel @ 3800 RPM and 5500 RPM.
Have an 83 with an 89 n/a engine, full RB long primaries exhaust.
Installed the SAFC-II last fall, finally am driving it enough to get some results. I don't have a wideband so I'm just tuning by feel, and I wired the O2 sensor into the SAFC-II. Points of interest:
Cruising:
I set the low throttle to ~53% as that number is only exceeded on steep hills during cruising. Normal cruising for me is between 35-50%. Pulled out around 20-30% fuel throughout the cruising band (2-5k rpm). Fuel mileage has gone from 24-29 Imperial MPG.
WOT
High throttle maps starts around 65%. Harder to tune with only O2 sensor, really need a wideband. But couple things, can't take away fuel @ 3800 RPM and 5500 RPM.
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