SAFC2 tuning question

silverstream · Sep 3, 2006, 09:56 PM

Hi all, I've had my SAFC2 installed.

The raw reading of the knock sensor is ~80 at idle, ~120 at 3500rpm and I've since calibrated it.

Armed with a APEXi Turbo Timer, Knock Sensor and my butt, i proceed with my butt tuning.

My NE points are:
800rpm, 1200rpm, 1600rpm, 2000rpm, 2600rpm, 3000rpm, 3600rpm, 4000rpm, 4600rpm, 5000rpm, 5600rpm, 6000rpm

Lo Th: 30%
Hi Th: 50%

First, I proceed with -10% at 800rpm, Lo Th and get about 5 to 10knocks and I adjusted it back to -8%.

Secondly, I proceed tuning the 1200rpm to 3000rpm Lo Th range.
Surprisingly, by adjusting to even -13% throttle, I am not getting a lot of knocks !
The max I get is ~70+ knocks if I use the peak reading.

The above varies a lot from the rest of the data I read, which hardly tune anything lower than 3000rpm.

Is the ECU compensating and overwriting my SAFC2 data reading, thus I am not getting any significant knocks in closed loop ?

However, I do find the car a bit perkier now for city-type stop-and-go traffic condition.

Any valuable advise ?

turbolarry · Sep 4, 2006, 12:16 AM

Quote:

Originally Posted by silverstream

Any valuable advise ?

Invest in some type of logger. The knock readings off a S-AFCII are not accurate.
http://www.evotuners.net/forums/showthread.php?t=315
Since you have the Apex TT you can do an old school tune off of the O2 voltages, but it is what it is... scroll down to Initial AFC Tuning (Low);
http://www.roadraceengineering.com/newafc.htm

SiCKlEyWiKeD · Sep 4, 2006, 12:36 AM

dude you are out of your freaking mind. put the settings back on zero and do not, I repeat DO NOT tune a freaking safc without a wide band or on a dyno. F'n newbs

cpoevo · Sep 4, 2006, 10:24 AM

Dude a v minimum you need to be able to log timimng and O2 voltage. I would never tune my car that way though. I would recommend a minimum of WB O2 and a way to log timing. Bad things can go wrong real fast, bad things go wrong even faster if you have no way of monitoring.

tony gibson · Sep 16, 2006, 09:42 PM

These guys are correct^^^ATLEAST a fucntional wideband...the ecu will pull timing long before the motor will blow while using an AFC...unless you are being ungodly stupid with the settings....Get a wideband and tune it for about 11.5 and below on pump gas. The more boost you run, the less timing the ecu will give you...and vice versa. Good luck.

Alex06 · Sep 18, 2006, 03:45 PM

FYI,knock reading on the SAFC is not very accurate.Go to a DYNO and tune with a WB.Good luck man!

xspsi4 · Sep 18, 2006, 04:20 PM

You should be ok with minus 8% although I would not push it any further with out a wb

EVOB23 · Oct 4, 2006, 09:30 AM

After a while it will come natural to tune the car with the afc

wickdaddy · Oct 13, 2006, 11:14 AM

i don't have an evo, but i have a turboed oz (no flames please lol) i have been reading up on tuning with my safc. I have a air/fuel guage, but it doesn't have the digital numeric numbers that i have seen on widebands... is this just a not as cool wideband, like do i need to have the numbers to properly tune or can i just go by the meter of rich and lean??

Blurr3dVision · Oct 27, 2006, 11:28 PM

Quote:

Originally Posted by wickdaddy

i don't have an evo, but i have a turboed oz (no flames please lol) i have been reading up on tuning with my safc. I have a air/fuel guage, but it doesn't have the digital numeric numbers that i have seen on widebands... is this just a not as cool wideband, like do i need to have the numbers to properly tune or can i just go by the meter of rich and lean??

No to tune properly you're going to need wideband. Narrowband o2 will not give you anywhere near enough of an accurate reading. Wideband isn't just a pretty gauge... Narrowband will give you Rich/Stoich/Lean and that's it for readings. Wideband will give you a much broder reading and much more accurate. A MUST for tuning without a dyno.

wickdaddy · Oct 28, 2006, 10:39 AM

Quote:

Originally Posted by Blurr3dVision

No to tune properly you're going to need wideband. Narrowband o2 will not give you anywhere near enough of an accurate reading. Wideband isn't just a pretty gauge... Narrowband will give you Rich/Stoich/Lean and that's it for readings. Wideband will give you a much broder reading and much more accurate. A MUST for tuning without a dyno.

icic well I guess that I am just going to have to maybe go out and eventually get a wideband if I am going to get my car tuned up totally. off the top of your head, do you know if the ECUflash program does the wideband readings? if it does than I might just get that cable!

Blurr3dVision · Oct 28, 2006, 11:30 PM

Quote:

Originally Posted by wickdaddy

icic well I guess that I am just going to have to maybe go out and eventually get a wideband if I am going to get my car tuned up totally. off the top of your head, do you know if the ECUflash program does the wideband readings? if it does than I might just get that cable!

No sorry I don't, I'm a srt-4 right now, awaiting the sale of the car so I can get an evo.

wickdaddy · Oct 29, 2006, 12:07 PM

Quote:

Originally Posted by Blurr3dVision

No sorry I don't, I'm a srt-4 right now, awaiting the sale of the car so I can get an evo.

oh duh... i probably should have looked at your profile

snailedhatch · Nov 16, 2006, 09:17 PM

tuning a FUEL controler without a wideband is a little silly dont ya think?

wickdaddy · Nov 17, 2006, 05:19 AM

i'm not sure what the guy was using when he was tuning my car. at that time, i wasn't real sure about tuning and stuff and just needed my car to idle decently... now i would like to get it totally dyno tuned...