strange ve fuel table
2 Attachment(s)
I'm doing my best at making my car run better with megasquirt and i'm noticing my ve fuel table looks reversed from any other one i've seen. Higher values in low kpa/rpm and lower values in high kpa/rpm. Seems to be the reverse of what i'd expect. These values are what autotune is deciding and car run reasonably well. Any idea of what would cause this?
Only real issue is my car will stall if I let the rpms fall to fast. I believe it is an over run fuel cut issue, so i'm playing with that a little. |
The low RPM high kpa cells (900 rpm 85 kpa in your picture for example) are most likely due to a poorly setup accel enrichment. For example, when you stamp on the throttle AFR's go lean for a moment then recover. During that lean event, the auto tune thinks you need alot more fuel in those cells when you only need proper acceleration enrichment to help compensate for that amount of TPSdot/MAPdot.
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Originally Posted by ericsbestshot
(Post 1494330)
I'm doing my best at making my car run better with megasquirt and i'm noticing my ve fuel table looks reversed from any other one i've seen. Higher values in low kpa/rpm and lower values in high kpa/rpm. Seems to be the reverse of what i'd expect. These values are what autotune is deciding and car run reasonably well. Any idea of what would cause this?
Only real issue is my car will stall if I let the rpms fall to fast. I believe it is an over run fuel cut issue, so i'm playing with that a little. my idle cells are in the 60's and boost in the 120-150's. and climbing with more boost/load. not flat or dropping like you have. hows the AFR on the gauge? 11-12 in boost? 14.7 at cruise? |
So you recommend having accel enrichment turned on when using autotune? How would this fix the idle cells which are also just as high
afr gauge reads exactly how you'd want it to. It follows my afr table perfectly. |
This isn't the only recent thread about this.
And it does not involve accelerator enrichment. Accel enrichment should always be on. |
I understand AE is not the only thing at play here. I've read through the similar recent threads and it surpasses what little knowledge I have with MS. I'm paying attention though so that I can maybe offer help to the next guy when no one else bites.
I was only commenting on one specific area of his map. low rpm high load. That area looks just like how mine did before I dialed in my enrichments. Hence my suggestion. |
1 Attachment(s)
Everything looks okay from what I see. Not sure about the AE though.
I did notice your deadtimes are wrong for the ID1000s. They should be like this for 60 psi fuel pressure: Attachment 228629 |
thanks for the heads up with the dead times. I can't believe i've been running it incorrectly for so long. I wonder how much this could be messing stuff up.
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They were not crazy off, but getting them correct is pretty important. I learned that lesson years ago when my alternator went out and I drove briefly on ~12 volts. Hooooly shit did it run bad.
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Is this MS2 or MS3? The DT and voltage slope posted above do not match IDs published data at 3 bar. Where did these numbers come from?
ID1000 |
Originally Posted by Ted75zcar
(Post 1494590)
Is this MS2 or MS3? The DT and voltage slope posted above do not match IDs published data at 3 bar. Where did these numbers come from?
ID1000 my mistake, didn't catch the 60psi point. Sorry! |
I'm using a DIYPNP. I update the dead times and it changed a little. Car seems to run better. But req fuel still kinda funky looking. Any chance all this is caused my timing map? Does it look reasonable?
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Originally Posted by ericsbestshot
(Post 1495322)
I'm using a DIYPNP. I update the dead times and it changed a little. Car seems to run better. But req fuel still kinda funky looking. Any chance all this is caused my timing map? Does it look reasonable?
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Originally Posted by sixshooter
(Post 1494469)
This isn't the only recent thread about this.
And it does not involve accelerator enrichment. Accel enrichment should always be on. |
Although in my case my table isn't reversed it just doesn't look like most ve tables I see
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