well thats on a turbocharged engine, with your Max, the timing table was developed for NA cars and the advance could increse more, not good for your supercharged motor.
That's good to know and explains some odd behavior I've been seeing lately. At WOT, though, when the ecu is in open loop, there is no correction attempt by the ecu, either with afr or timing, right?
If so, the idea then is to allow the ecu to control partial throttle operation by itself without any interference from the SAFC. So low throttle settings are kept zeroed out, and then the threshold value for transition from low to high settings should be set pretty high, say 80%, and then use SAFC high throttle settings to adjust when boosting at WOT.
The difficulty then may be in the 50-80% throttle regime where I do see boost developing, but can't effectively use the SAFC to lower afr. Fortunately that is an area that I can pretty much stay out of if I'm careful. At least for the type of driving I do.
Thats why I think the AFC is ok to use for a fine tuning device but when used to compinsate for larger injectors, etc, its sort of sketchy. Some people will argue all day about this but they also seem to be the guys that are blowing up all the time as well!
Mike
__________________
There can only be one Icy Hot Stunta, Don't Hate.
I'm going to make this a sticky for the time being. It'll stay open as long as it pertains to this subject.
keep in mind, I ran SAFC because JWT wasn't an option for me. It worked, but you always want to go with a better, more thorough option, full ecu replacement or eventually standalone (very expensive)
__________________
all dun grow'd up.
only real motored toy left:
'06 GSX-R 1000
'07 Harley V-rod night rod
I was running the SAFC and JWT ECU for about 6 months on my turbo'd 200. I even had it tuned on a dyno, but the car never ran right. I corrected lots of little problems and adjusted everything from timing, tps, spark plug gap to see if that was the issue. It finnaly came down to removing the SAFC. Once I did that the car ran 100% better, the idle was steady, the part throttle acceleration had no hesitation or hick ups, no backfiring and much better gas millage.
Now maybe I never had my SAFC tuned properly, and that may have been the issue, but I read all the posts and did lots of research, and it never worked for me. I wish it did, because the SAFC is one cool piece of hardware
Another question: will just having the SAFC connected, but with all the correction factors zeroed out, result in problems? Doesn't seem like it would, unless the very act of cutting the maf wire and routing the voltage through the SAFC is enough to significantly change the voltage the ecu eventually sees.
This is what I am wanting to know also. Since JWT ECU's are known to run rich could you just put a correction factor of -5% without having your car run like ass?
This is what I am wanting to know also. Since JWT ECU's are known to run rich could you just put a correction factor of -5% without having your car run like ass?
Its a misconseption that they run rich, they run less rich than stock. People who have that opinion don't have a wideband O2 meter.
Mike
__________________
There can only be one Icy Hot Stunta, Don't Hate.
I was running the SAFC and JWT ECU for about 6 months on my turbo'd 200. I even had it tuned on a dyno, but the car never ran right. I corrected lots of little problems and adjusted everything from timing, tps, spark plug gap to see if that was the issue. It finnaly came down to removing the SAFC. Once I did that the car ran 100% better, the idle was steady, the part throttle acceleration had no hesitation or hick ups, no backfiring and much better gas millage.
Now maybe I never had my SAFC tuned properly, and that may have been the issue, but I read all the posts and did lots of research, and it never worked for me. I wish it did, because the SAFC is one cool piece of hardware
Thankyou!!! This is the response I was hoping to see. I have been experiencing pretty much the same symptoms and experience as you ever since I got the JWT ecu. I've checked everything else, looks like it's time to remove the SAFC and see what happens.
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.
Linear Mode
