The truth about the afc hack!!!!!!!
05-05-2003, 08:27 PM
#42
3.0 BAR
Join Date: Mar 2003
Posts: 21,479
Re:The truth about the afc hack!!!!!!!
Originally Posted by adler
No, i mean below 9.25 psi, I don't want to kill my engine 
I understand that the ECU won't give my engine any more fuel if the boost is above 9.25 psi, but what if the boost is 0-9.25 psi?
I understand that the ECU won't give my engine any more fuel if the boost is above 9.25 psi, but what if the boost is 0-9.25 psi?__________________
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05-07-2003, 04:39 PM
#43
1.0 BAR
Join Date: Mar 2003
Posts: 432
Re:The truth about the afc hack!!!!!!!
OK so if I decide to go with the AFC hack and take all precations like using 91 fuel, one level colder plugs, good sized intercooler and listen for detonation, I should be fine right? this is for 6-8psi on a D16Y7. What about using slightly smaller injectors like 350cc-400cc so that you don't have to go so far negative on the AFC? Will this work up to 7psi? will this work in getting closer to where the timing should be?
05-07-2003, 05:15 PM
#44
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Join Date: Mar 2003
Posts: 21,479
Re:The truth about the afc hack!!!!!!!
Yes you should be fine.
No, do not use smaller injectors. If you use smaller injectors the settings on the AFC will be higher, thus making the hack not work. Lets say with 450cc injectors you set the AFc at -40 all the way across. This will trick the ecu when you are boosting to think that everything is ok and not to send a cel. If you use say 350cc injectors, the settings on the AFC will be around -30 or lower all the way across. This will probably not be enough to trick the computer. Get a set ofd 450cc DSM injectors and you will be fine. Also, I would run 8 psi instead of 6. At 5-6 psi the AFC is advancing the timing to the full extent. 8 psi will be allot better.
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No, do not use smaller injectors. If you use smaller injectors the settings on the AFC will be higher, thus making the hack not work. Lets say with 450cc injectors you set the AFc at -40 all the way across. This will trick the ecu when you are boosting to think that everything is ok and not to send a cel. If you use say 350cc injectors, the settings on the AFC will be around -30 or lower all the way across. This will probably not be enough to trick the computer. Get a set ofd 450cc DSM injectors and you will be fine. Also, I would run 8 psi instead of 6. At 5-6 psi the AFC is advancing the timing to the full extent. 8 psi will be allot better.
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05-07-2003, 05:36 PM
#46
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Join Date: Mar 2003
Posts: 21,479
Re:The truth about the afc hack!!!!!!!
My car sees 6 psi for about a milisecond. Its like its not even there. As long as 6 psi is not your max boost.
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05-07-2003, 09:19 PM
#47
1.0 BAR
Join Date: Mar 2003
Posts: 432
Re:The truth about the afc hack!!!!!!!
true true....so if you ever want boost you have to go full throttle? no partial throttle cruising at 4-6 psi like when you use boost to go up a hill instead of downshifting. seems like those milleseconds of detonation would add up....but I was reading the other day that detonation is almost twice as likely to happen at low-mid RPM because at high RPM detonation doesn't have time to do it's bad stuff.
05-07-2003, 11:29 PM
#48
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Join Date: Mar 2003
Posts: 21,479
Re:The truth about the afc hack!!!!!!!
I have never been in that situation. We don't have any big hills around here. I have ran at about 1-3 psi sometimes just kinda cruising, but if I need any more power I just stomp on it. I'm not easy on my car. I either drive good or bad. Mostly bad. I can't detect any detonation anywhere. I'll check under a smooth low throttle run and see If I can hear anything. I doubt it. 
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06-11-2003, 09:52 AM
#49
1.0 BAR
Join Date: Dec 2002
Posts: 463
Re:The truth about the afc hack!!!!!!!
This is my set-up:
http://www.geocities.com/thermalfid16/VAFChack1.html
boosting 8psi and still at stock timing, no detonation. I do want to retard my timing a little bit. Any suggestion how far.....Dr Boost? I was told around .5 per 1 psi boost.
http://www.geocities.com/thermalfid16/VAFChack1.html
boosting 8psi and still at stock timing, no detonation. I do want to retard my timing a little bit. Any suggestion how far.....Dr Boost? I was told around .5 per 1 psi boost.
