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Rikyrat |
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#1
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Member ![]() ![]() Group: Members Posts: 58 Joined: 30-January 19 From: Phoenix Member No.: 22,844 Region Association: None ![]() |
EGADS, tuning my megasquirt fi system, is driving me nervous.
If anybody has and would wiling to share tune files with me, I would be very appreciative. As that would allow me to compare it with mine Thank you in advance |
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BeatNavy |
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#2
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Certified Professional Scapegoat ![]() ![]() ![]() ![]() Group: Members Posts: 2,924 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region ![]() ![]() |
(IMG:style_emoticons/default/agree.gif)
Good info from Jeff. From what I've heard alpha-N may be the way to go with ITB's. I actually ran Alpha-N on mine for a while (it's a stock 2.0 throttle body/manifold), and it ran pretty well. I just didn't seem to be getting a strong enough vacuum at idle to make idle fine-tuning possible. This is related to my second comment... ...don't put TOO much stock in type 4 AFR readings at idle. You MAY get something useful, or you may not, depending on a number of factors. I was crazy rich when my AFR showed crazy lean, and that had me chasing my tail with VE values and other settings for a long time. My point is use other inputs besides AFR at idle to determine the best tune. I should have trusted my instincts earlier. Yeah, tell us more about your setup. |
mightyohm |
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#3
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Advanced Member ![]() ![]() ![]() ![]() Group: Benefactors Posts: 2,277 Joined: 16-January 03 From: Seattle, WA Member No.: 162 Region Association: Pacific Northwest ![]() ![]() |
(IMG:style_emoticons/default/agree.gif) ...don't put TOO much stock in type 4 AFR readings at idle. You MAY get something useful, or you may not, depending on a number of factors. I was crazy rich when my AFR showed crazy lean, and that had me chasing my tail with VE values and other settings for a long time. My point is use other inputs besides AFR at idle to determine the best tune. I should have trusted my instincts earlier. This is true, if you have a cam with a lot of overlap your vacuum and AFR below a certain RPM will be unpredictable. I had a motor once with a hot cam that had very little vacuum below 2000 or 2500 RPM. It was difficult to get a good idle if I tuned by the numbers. The numbers might look "wrong" but if the motor idles and is otherwise happy you don't need to worry too much about it. It's just a matter of getting the motor to keep a steady idle, not bog down, not foul plugs. If the motor has a big cam it may never idle very well. My solution to this in the past has been to raise the idle speed and add advance at idle. Your motor might behave differently. If you have ITB's and you are running alpha-N then you can safely throw vacuum out the window... |
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