Safc Help Wont run Unless +25%
10-08-04, 08:09 PM
#1
Boosting Again
Thread Starter
Safc Help Wont run Unless +25%
first of all i know this should be in the safc section but no one goes there and most people who have safcs are 2nd gen people so please dnot move this thread.
ok now back to what im saying. i finally got my car to run right with 550s in primary. timing is all set, but car will not run good unless safc is set +25% from 1200-3800. if i set it at zero it will hesitate mad from 1k-3k. but at +25%it runs fine. i herd you CAN'T add fuel with an safc only take away. if so then why does it allow you to + at all? adn if you cant add fuel what is +25% doing to my car. is it bad to run it at +25% for primary nijectors? i dotn intend on keeping safc to long. i need to figure out which standalone i want first. but thats another deal. this is my daily driver so i need to to run right.
ok now back to what im saying. i finally got my car to run right with 550s in primary. timing is all set, but car will not run good unless safc is set +25% from 1200-3800. if i set it at zero it will hesitate mad from 1k-3k. but at +25%it runs fine. i herd you CAN'T add fuel with an safc only take away. if so then why does it allow you to + at all? adn if you cant add fuel what is +25% doing to my car. is it bad to run it at +25% for primary nijectors? i dotn intend on keeping safc to long. i need to figure out which standalone i want first. but thats another deal. this is my daily driver so i need to to run right.
10-08-04, 09:02 PM
#2
Wait................What?
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Sure you can add fuel... by maxxing out the injectors... say stock the injectors are running at 55 percent duty cycle.. you can increase pulse width to say.... 65 percent duty cycle... but once you reach full duty cycle, you can't add more fuel.
10-09-04, 12:36 AM
#3
I wish I was driving!
Originally Posted by gergrx7
first of all i know this should be in the safc section but no one goes there and most people who have safcs are 2nd gen people so please dnot move this thread.
ok now back to what im saying. i finally got my car to run right with 550s in primary. timing is all set, but car will not run good unless safc is set +25% from 1200-3800. if i set it at zero it will hesitate mad from 1k-3k. but at +25%it runs fine. i herd you CAN'T add fuel with an safc only take away. if so then why does it allow you to + at all? adn if you cant add fuel what is +25% doing to my car. is it bad to run it at +25% for primary nijectors? i dotn intend on keeping safc to long. i need to figure out which standalone i want first. but thats another deal. this is my daily driver so i need to to run right.
ok now back to what im saying. i finally got my car to run right with 550s in primary. timing is all set, but car will not run good unless safc is set +25% from 1200-3800. if i set it at zero it will hesitate mad from 1k-3k. but at +25%it runs fine. i herd you CAN'T add fuel with an safc only take away. if so then why does it allow you to + at all? adn if you cant add fuel what is +25% doing to my car. is it bad to run it at +25% for primary nijectors? i dotn intend on keeping safc to long. i need to figure out which standalone i want first. but thats another deal. this is my daily driver so i need to to run right.
10-09-04, 12:49 AM
#4
Boosting Again
Thread Starter
t2, i dotn know what other details you want, btu before i had 720s in primary adn car would run but it didnt run well. so i switched 550s in primary adn wouldnt run at all. so i messed with timing, adn finally got it right. adn a friend of mine who is helpign with my car set safc at this today and it works. but i dotn konw if it should be like this or not.
10-09-04, 01:22 AM
#5
I wish I was driving!
Originally Posted by gergrx7
t2, i dotn know what other details you want, btu before i had 720s in primary adn car would run but it didnt run well. so i switched 550s in primary adn wouldnt run at all. so i messed with timing, adn finally got it right. adn a friend of mine who is helpign with my car set safc at this today and it works. but i dotn konw if it should be like this or not.
Any idea what your fuel pressures look like?
10-09-04, 10:14 AM
#7
Engine, Not Motor
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Are you SURE your AFM type is set correctly on the S-AFC? I had these exact symptoms when my S-AFC spontaniously changed to HOTWIRE type AFM while driving. Quite scary. Thought my engine blew. 
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10-09-04, 01:23 PM
#9
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I had similar problems caused by a badly wired fuel pump. Check your fuel pressure.
Worst case, just remove the safc. It should be fairly easy to unplug it from the harness and jumper the afm in and afm out pins.
Worst case, just remove the safc. It should be fairly easy to unplug it from the harness and jumper the afm in and afm out pins.
10-09-04, 05:43 PM
#11
I'm a boost creep...
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Originally Posted by poor_red_neck
Sure you can add fuel... by maxxing out the injectors... say stock the injectors are running at 55 percent duty cycle.. you can increase pulse width to say.... 65 percent duty cycle... but once you reach full duty cycle, you can't add more fuel.
Last edited by NZConvertible; 10-09-04 at 06:05 PM.
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