Safc rpe reads 450, but stack tach reads 1000 pls help

[nick]

Hi guys. So I bring my car to crappy tire to do an oil chance,but after the oil change may car starting to run like crap. I won't go more than 3000 rpm and i notice that may safc is reading 450 rpm but my stack tach rads 1000. What could be the problem. The guy who did my oil change got fired today coz of what he did.

My cay is 1g with 2g mas. I think the guy ho did the oil change change my safc setting pleae help.

 

[4Lurker4]

Hi guys. So I bring my car to crappy tire to do an oil chance,but after the oil change may car starting to run like crap. I won't go more than 3000 rpm and i notice that may safc is reading 450 rpm but my stack tach rads 1000. What could be the problem. The guy who did my oil change got fired today coz of what he did.

My cay is 1g with 2g mas. I think the guy ho did the oil change change my safc setting pleae help.

Well if he disconnected the battery for anything (who knows he might of) it restarts the SAFC so you need to reprogram it. Or it could be what was discussed on this thread.

http://www.dsmtuners.com/forums/tuning-engine-management/406585-safc-2-newbie-questions.html

Hope that helps.

 

[nick]

thank you for the replay. What settinh should i put for
1 Hi- THRL
2 Lo- THRL
3 TH-POINT
4 DEC. AIR

 

[4Lurker4]

Well it'll depend on your injectors so you'll need to dial them in. Don't have 750s myself. although technically you shouldn't be running a SAFC only (unless you have a chipped ecu or a GM MAFT and have that dialed in collaboration with the SAFC). 650cc is the best an SAFC can tune

Best thread for high/low settings
http://www.dsmtuners.com/forums/tun...82204-initial-s-afc-settings-high-low-2g.html

As for general workings of the SAFC to get you to know what you're using (not sure if you were the original one to tune it)

http://www.dsmtuners.com/forums/articles-tuning-ecu/105569-how-safc-works.html

 

[nick]

I don't have any kind of logger right now so I just need the basic set up so i can get the car running a bit better till i get my wide band install. I only have the stack injector . Thanks again for the help

 

[4Lurker4]

No problemo,

http://www.dsmtuners.com/forums/newbie-forum/274055-safc-ii-stock-injectors-fuel-pump.html

Specifically this quote

Ok, there are two setting groups on the afc. One is throttle point, the other is air correction (which is what fools the ECU into adding more or less fuel).

Set the corrections to 0% on both the HI and LOW ranges. Set the throttle points to 30Low/80Hi and you'll be right until you upgrade your injectors and pump to take advantage of the light show you just installed

Found a better link for ya for later tuning (when you put bigger injectors)
http://www.roadraceengineering.com/newafcsetting.htm

 

[nick]

if I have a 2g mass on my 1g car the correction's will still be the same?

 

[4Lurker4]

if I have a 2g mass on my 1g car the correction's will still be the same?

Scratch what I said, your ecu will see less air due to the change (even though there is more air going in, making it run lean), for that you'll need a logger

http://www.dsmtuners.com/forums/articles-tuning-ecu/58403-definitive-piggyback-tuning-guide.html which is the tech page on tuning SAFCs

I've been doing a bit of reading on your issue, some guys have ran the stock injectors with a 2g mas with no issues, yet most at least upgrade to 550s to compensate for the air difference. You could compensate for that air with the SAFC, but you'll need to tune it yourself, some say the difference is 17% others 25%. Reason why I can't give you a definitive answer. Maybe someone else on here can help from first hand experience with this set-up.

http://www.dsmtuners.com/forums/newbie-forum/333433-2g-1g-maf-questions.html (air changes from 1g to 2g mas)

Can't tell you for sure since I don't run a 1g, sorry couldn't be more help

 

[nick]

No! Thank you for helping me. So let say 17 to 20% difference, where do you ad-jut that?