Speed density extreme lean condition when starting off from a stop (9653 V7 SD rom)
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nor11384 (Dec 2, 2019)
#48
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Curious as to your findings so far. I was bored at lunch today so I was re-reading many old threads on similar subjects...even found the one where you were talking about this earlier and discussing the ***Warmup Enrichment vs Load and RPM table.
Btw, have you adjusted the two maf comp warmup tables and the warmup enrichment tables from the stock values?
Also, have you tried adjust the async and sync fpw tables at all? It seems like some people have had success with these tables, and if your issue follows what 03white saw, it appears that the sync fpw may be the issue.
Of course, when this exactly happens is important. If it's only when warmup up or even after completely warmed up, for example.
Also, out of curiosity, have you adjusted your IPW cranking/running (whatever they are named now) for your bigger injectors? I think all of the subject tables are in mrfred's advanced fuel control thread. That is just a great thread...has to be one of the best of all time ... I'm curious as to how you are getting on with this. If you're still having issues, I would like to suggest some things to try (if you haven't already).
Btw, have you adjusted the two maf comp warmup tables and the warmup enrichment tables from the stock values?
Also, have you tried adjust the async and sync fpw tables at all? It seems like some people have had success with these tables, and if your issue follows what 03white saw, it appears that the sync fpw may be the issue.
Of course, when this exactly happens is important. If it's only when warmup up or even after completely warmed up, for example.
Also, out of curiosity, have you adjusted your IPW cranking/running (whatever they are named now) for your bigger injectors? I think all of the subject tables are in mrfred's advanced fuel control thread. That is just a great thread...has to be one of the best of all time ... I'm curious as to how you are getting on with this. If you're still having issues, I would like to suggest some things to try (if you haven't already).
#49
Curious as to your findings so far. I was bored at lunch today so I was re-reading many old threads on similar subjects...even found the one where you were talking about this earlier and discussing the ***Warmup Enrichment vs Load and RPM table.
Btw, have you adjusted the two maf comp warmup tables and the warmup enrichment tables from the stock values?
Also, have you tried adjust the async and sync fpw tables at all? It seems like some people have had success with these tables, and if your issue follows what 03white saw, it appears that the sync fpw may be the issue.
Of course, when this exactly happens is important. If it's only when warmup up or even after completely warmed up, for example.
Also, out of curiosity, have you adjusted your IPW cranking/running (whatever they are named now) for your bigger injectors? I think all of the subject tables are in mrfred's advanced fuel control thread. That is just a great thread...has to be one of the best of all time ... I'm curious as to how you are getting on with this. If you're still having issues, I would like to suggest some things to try (if you haven't already).
Btw, have you adjusted the two maf comp warmup tables and the warmup enrichment tables from the stock values?
Also, have you tried adjust the async and sync fpw tables at all? It seems like some people have had success with these tables, and if your issue follows what 03white saw, it appears that the sync fpw may be the issue.
Of course, when this exactly happens is important. If it's only when warmup up or even after completely warmed up, for example.
Also, out of curiosity, have you adjusted your IPW cranking/running (whatever they are named now) for your bigger injectors? I think all of the subject tables are in mrfred's advanced fuel control thread. That is just a great thread...has to be one of the best of all time ... I'm curious as to how you are getting on with this. If you're still having issues, I would like to suggest some things to try (if you haven't already).
#50
Evolved Member
iTrader: (8)
If you are only logging 1-Byte pulse width, you will not see a lot of change in IPW when this is going on.
Figure injector dead time is ~0.7ms so your actual pulse width is around 1.8ms. 1-Byte resolution is 0.256ms so figure 0.256ms of variance on a 1.8ms actual IPW means your AFR can vary about 15% under these conditions yet the log will not show any change in IPW at all.
15% lean is 16.9:1 AFRs, as you can see, you can get an AFR that causes poor drive ability yet it might not show up at all when logging only 1-byte IPW.
Figure injector dead time is ~0.7ms so your actual pulse width is around 1.8ms. 1-Byte resolution is 0.256ms so figure 0.256ms of variance on a 1.8ms actual IPW means your AFR can vary about 15% under these conditions yet the log will not show any change in IPW at all.
15% lean is 16.9:1 AFRs, as you can see, you can get an AFR that causes poor drive ability yet it might not show up at all when logging only 1-byte IPW.
#51
Hmm, yeah that makes a lot of sense, I'll have to look into logging a 2 byte IPW and see what comes up. I'm sure the dead time on my FIC 1050's doesn't help much either, but I have to admit the more I play with the latencies the more they run just as smooth as stock.
#52
I forgot to update this from my previous posts...
Mr. Bradley is correct on the correction around the 100Load range, I adjusted my sensor VE up about 5% and it completely cleared out ANY lean issues I was having with the initial stop and start in first gear and improved the drivability and tip-in greatly throughout the rest of the range. I would count this thread as problem solved.
Thanks everyone for your input!
Mr. Bradley is correct on the correction around the 100Load range, I adjusted my sensor VE up about 5% and it completely cleared out ANY lean issues I was having with the initial stop and start in first gear and improved the drivability and tip-in greatly throughout the rest of the range. I would count this thread as problem solved.
Thanks everyone for your input!
#55
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old topic but I felt the need to necrobump. I was having this EXACT problem. Ihave been playing with the Sensor VE settings a bit. I got the lean condition to go away, only for it to run rich in the later gears. Then it was running rich in the later gears and lean in 1st gear, LOL. Anyway I think I ALMOST have it gone. It was a bit lean in 1st and a bit rich in 2nd. I made one more small adjustment and I'm about to test on my way to the gym.
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