Stumble help please
#4
Slowest Progress Ever
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That photo says at 5855 RPM's your at 149 KPA and 13.459 AFR.
That means you're at about 7psi at almost 6,000 RPM's and you are wayyy too lean. You should be at around 12.0AFR, not 13.459. Richen it up some more. Is it detonating at that? Cause I'd think it should be.
That means you're at about 7psi at almost 6,000 RPM's and you are wayyy too lean. You should be at around 12.0AFR, not 13.459. Richen it up some more. Is it detonating at that? Cause I'd think it should be.
#7
Slowest Progress Ever
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I'm going to bed, but I will say this. If you're on the throttle and you see leaner than 12.5 at 7psi or more, take your foot off the throttle immediately. Take a mental note of what rpms you were at when it was that lean, and how much boost you were running and add fuel in that cell, then taper the cells around it. You shouldn't have 1 cell read like 120, and the one right under it read like 89. Keep them close to keep the table smooth. Tomorrow morning I will post example fuel ve tables, and get back at ya about corrections. Expect to see me around 10 eastern standard time...(7am) California time.
#12
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I still think it's too lean...I mean you're at 13.0 at that same RPM and MAP. Add more fuel in those cells and keep the surrounding cells within lets say 10 for now of the rest.
To add fuel to a bunch of cells at once, you can highlight a few cells at a time and click on the + symbol. Then you can type in the percentage to add and it'll take those selected cells up by that percentage.
To add fuel to a bunch of cells at once, you can highlight a few cells at a time and click on the + symbol. Then you can type in the percentage to add and it'll take those selected cells up by that percentage.
#15
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That first fuel table looks awful. I don't know if VE rolls off in your car like it does in mine, but it should probably look more like these:
![](https://www.miataturbo.net/attachments/build-threads-57/31226d1326085611-hustlers-driver-shame-thread-weird.jpg)
edit: This was a draft, its cleaner now.
older, before I fixed the intake valves:
![](https://www.miataturbo.net/attachments/megasquirt-18/28386d1321660943-why-fuel-being-pulled-my-top-end-thread-fuel-table.jpg)
It's generally a no-no if have anything but an increase in VE value from left to right, bottom to top, my car breaks this rule a little bit, but I call it "artistic license". With your revised fuel table, things are getting better and the duty-cycle line looks more reasonable, but you're still leaner than most of the NA cars I tune. Show us your AFR table, please.
![](https://www.miataturbo.net/attachments/build-threads-57/31226d1326085611-hustlers-driver-shame-thread-weird.jpg)
edit: This was a draft, its cleaner now.
older, before I fixed the intake valves:
![](https://www.miataturbo.net/attachments/megasquirt-18/28386d1321660943-why-fuel-being-pulled-my-top-end-thread-fuel-table.jpg)
It's generally a no-no if have anything but an increase in VE value from left to right, bottom to top, my car breaks this rule a little bit, but I call it "artistic license". With your revised fuel table, things are getting better and the duty-cycle line looks more reasonable, but you're still leaner than most of the NA cars I tune. Show us your AFR table, please.
#18
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You still need to fix that garbage fuel table.
Last edited by hustler; 01-18-2012 at 09:03 AM.
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