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Old 02-24-2004, 03:21 PM   #1
Tedslowrx
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Default afcs on wrxs? HELP!

Hey hows it goin? i have a ques i hope someone loacl can help me out on i just got my S-afc 2 installed and my guy tried to tune it but he said the ecu jus kept bringing things back to normal so basiclly the afc was a waste of money so i was wondering if he didnt know how to tune it and i should jus go somewhere else or is the afc really useless? if anyone local knows how to tune the damn thing please let me kno
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Old 02-24-2004, 11:57 PM   #2
subiebill
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You should go to somebody who has an awd dyno and have them do a couple of runs and get it properly tuned by professionals. I have an afc II and it is making my car run lean and I am going to turbotrix to get mine professionally tuned. Look in your local forum to see who has a dyno and can tune the afc for you...
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Old 02-25-2004, 03:57 AM   #3
skywalker
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Your tuner is partially correct the ECU will learn over time but it still can be used to run things leaner, though you will need to reset your ECU every so often to keep the optimal tune.

They can be tuned, but reliablity on the tune is shortley lived as the ECU will adjust.

Better options are a relfash as this will adjust according to weather, elevation, and various other climates as the seasons change and where you drive.

Cheers,
Bill Knose
I-Speed USA
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Old 02-26-2004, 12:03 PM   #4
Rickyh
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I have had one for about a month and a half. I have had no trouble with the ecu learning around it. I can tell because when I switch to the stock map without correction the egt's are about 40 degrees lower. I have been using an egt to lean things out a bit(1-2%), and have had noticable results. I don't want to get too aggressive with it until I get a wideband. There are a few guys around here running them with success. There is a guy named Kenshiro who is running one with a vf22 and is getting low 12's. maybe your initial settings aren't right? Now I know that this isn't the optimal setup (utec would be better), but for 275 bux it is good enough for me. there was a post awhile back about someone making 300 whp with an safc, vf30 and STOCK FUEL SYSTEM!!! Whoever did that is begging for their motor to blow. I'll do a search for that post to see if I can get more info on it.
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Old 02-26-2004, 03:05 PM   #5
Tedslowrx
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thanks people i am afc illiterate =)
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Old 02-26-2004, 04:28 PM   #6
skywalker
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Quote:
Originally posted by Rickyh
I have had one for about a month and a half. I have had no trouble with the ecu learning around it. I can tell because when I switch to the stock map without correction the egt's are about 40 degrees lower. I have been using an egt to lean things out a bit(1-2%), and have had noticable results. I don't want to get too aggressive with it until I get a wideband. There are a few guys around here running them with success. There is a guy named Kenshiro who is running one with a vf22 and is getting low 12's. maybe your initial settings aren't right? Now I know that this isn't the optimal setup (utec would be better), but for 275 bux it is good enough for me. there was a post awhile back about someone making 300 whp with an safc, vf30 and STOCK FUEL SYSTEM!!! Whoever did that is begging for their motor to blow. I'll do a search for that post to see if I can get more info on it.
What octane was he on? If the octane is pretty good then he will probably be fine. Though if it is 91 you are probably right, the engine won't be lasting to long.

Cheers,
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Old 02-26-2004, 11:40 PM   #7
ilivas
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grab the greddy e-manage off froogle.com, it costs the same as the afc but is probably much better.
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Old 02-27-2004, 11:50 AM   #8
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The "guy" that tuned the SAFC needs some instruction. The ECU will only adjust for closed loop operation. If that adjustment or "trim" as people call it goes into a long term correction, that correction is applied to open loop fueling in a gross manner. Simple adjusting the "low" throttle map of the SAFC so very little AF correction is taking place is the first step. After this is complete the "high" throttle map in the SAFC can be set to adjust open loop fueling and the AFR's will remain constant. This also holds true for the Utec as the Utec manipulates MAF voltage the same way the SAFC does.

Dollars to donuts the Low and High throttle settings on the SAFC are incorrect for the WRX ECU and the person tuning the SAFC did not datalog and study AFR corrections when setting the Low throttle map.

Cya

Clark
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Old 02-27-2004, 06:39 PM   #9
Conduit
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What are the correct settings for Low and High throttle maps?
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Old 02-27-2004, 10:30 PM   #10
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I've been using 20 and 65. it seems to be working for me. Now i just have to get delta dash like you suggested and i can really do something with this thing
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Old 02-28-2004, 08:07 AM   #11
subiebill
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I am running too lean if I adjust the low and high throttle with the mods I have to 20 and 65 do you think that will eliminate my problem with my car. It isn't getting the proper air fuel ratio it needs cause the car stalls after starting it sometimes...
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Old 02-28-2004, 12:49 PM   #12
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will the ;car idle at all? If I were you I would set everything back to 0. i mean with no correction at any rpm point. see If that solves the problem.I would also check to see if the other settings are correct. it should be hot wire 20 in 20 out. if it does at least you will be able to drive normally . also, what mods do you have? keep in mind that i am in no way some sort of tuning guru, but i know what works for me and i know the base settings for my car.

Last edited by Rickyh; 02-28-2004 at 02:49 PM.
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Old 02-28-2004, 06:57 PM   #13
subiebill
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It idles rough sometimes as low as 595 when usually holds at 750 so you can feel the car start to go. I have it hotwire at 20 20 I also played with the ne points and the th points as described on a website I found to tune it but it still keeps acting up but I am gonna get it tuned after the up and dp. Right now I have a blitz intake, afc, rsm, borla cat back and up and dp on the way with hks evc V boost controller on the way...
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Old 02-28-2004, 10:17 PM   #14
Rickyh
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set all the ne points to 0 and reset the ecu. this should solve your problems if they are related to a bad tune on the safc.
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Old 02-29-2004, 09:53 AM   #15
subiebill
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how long should i disconnect the battery to reset it for a couple of hours and should i press on the brake to help move the process along a little faster...
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Old 02-29-2004, 11:11 AM   #16
Rickyh
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disconnect the battery, hold the brakes a fewseconds then reconnect it. it should take about 20 seconds max.
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Old 02-29-2004, 05:40 PM   #17
subiebill
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ok, thanks...
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Old 03-01-2004, 11:33 PM   #18
Tedslowrx
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unhooked the afc today car still idleing at 2k when i turn it on.......
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Old 03-18-2004, 04:22 PM   #19
GotWRX03
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shouldn't Hot Wire settings be on 12 IN & 12 OUT? at least that's what the updated data is HW 12 for the GD2.
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