trying first SD tune, surging/sputtering horribly...
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trying first SD tune, surging/sputtering horribly...
I set the P0103 to set MIL at first instance and walked through the HPTuners wideband tuning help file. The SES light showed on the dash this time (if you read my last post).
I have to pedal the car to even keep it running/idling with the MAF unplugged, and it's fighting for all it's worth sputtering and surging. If I let off the gas it will sputter to keep running and sometimes dies. Is this normal for my mods (or normal at all ?). Should I just drive it in SD and log data and hope the tuning progressively make the idle/drivability better ?
The log was about 10:1 on the wideband at idle startup - I think it's the 1.15x to the VE tables in the HPTuners help instructions that's pushing it so rich, I will try the same steps without that change today.
I am attaching a brief scan of it idling in SD mode.
Any help or tips would be greatly appreciated... This happen to anyone else ?
Thanks !
Rob (Bad30th)
I have to pedal the car to even keep it running/idling with the MAF unplugged, and it's fighting for all it's worth sputtering and surging. If I let off the gas it will sputter to keep running and sometimes dies. Is this normal for my mods (or normal at all ?). Should I just drive it in SD and log data and hope the tuning progressively make the idle/drivability better ?
The log was about 10:1 on the wideband at idle startup - I think it's the 1.15x to the VE tables in the HPTuners help instructions that's pushing it so rich, I will try the same steps without that change today.
I am attaching a brief scan of it idling in SD mode.
Any help or tips would be greatly appreciated... This happen to anyone else ?
Thanks !
Rob (Bad30th)
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Try reducing the VE table 1200, 800, and 400rpm columns by 10%, 15%, and 20% respectively - go down to 70 Kpa, and see if that doesn't get you closer so it will run enough to get you some good data.
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You want to work out your idle before you log the rest of the data. Using the steps in the doc your using, let the car idle until you get 50 or so counts at idle. Then take that data and apply it to your VE table. Will be a night and day difference after you apply the data.
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Originally Posted by foff667
did you upgrade to the 2 bar or 3 bar pkg?
Originally Posted by BLK02WS6
Try reducing the VE table 1200, 800, and 400rpm columns by 10%, 15%, and 20% respectively - go down to 70 Kpa, and see if that doesn't get you closer so it will run enough to get you some good data.
The new 71cc heads are really flowing a lot of air it looks like.
Originally Posted by TAQuickness
You want to work out your idle before you log the rest of the data. Using the steps in the doc your using, let the car idle until you get 50 or so counts at idle. Then take that data and apply it to your VE table. Will be a night and day difference after you apply the data.
I'm beginning to see a correlation between the rough idle in SD mode and the P0121 code. More air than VE thinks should be there ? I do have a 1/4" hole in the TB blade... I will log IAC counts to see where they are.
Thanks for the help guys, keep it comin' !!
Cheers,
Rob (Bad30th)h
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Originally Posted by ninobrn99
cant he just use 2.0 and create a RAF histogram to get his idle down? Thats what I did, then I did my ve.
Rob (Bad30th)