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What controls A/F ratios at higher loads?

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Old Apr 13, 2011, 12:06 AM
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What controls A/F ratios at higher loads?
What contols A/F ratios at higher loads? When my engine goes from vacuum through 0 psi into boost, she goes *very* lean and will start to knock badly if I leave my foot in it. Its a fueling issue and I'm at the point where I don't know where else to look.

Thanks mates!
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Old Apr 13, 2011, 12:31 AM
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post up logs and your rom. that will help get your issue resolved
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Old Apr 13, 2011, 01:18 AM
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Original fuel pump?
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Old Apr 13, 2011, 02:32 AM
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lean spool
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Old Apr 13, 2011, 02:54 AM
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Originally Posted by evo8426
post up logs and your rom. that will help get your issue resolved

Thanks for the help. I can post up the rom, but it knocks too much to properly do any sort of pull... Anything more than about 20% throttle will make her lean out. Mods are GT3076r, gsc 1 cams, wally 255, 880cc injectors.
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Old Apr 13, 2011, 02:55 AM
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Originally Posted by todd6027
lean spool

Nah, I wish.
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Old Apr 13, 2011, 04:09 AM
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Check the vacuum line on the fuel pressure regulator. Fuel pressure may not be increasing with boost like it should be.
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Old Apr 13, 2011, 05:51 AM
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Originally Posted by scrivs
Nah, I wish.
take out some timing and richen it up if everything else is ok fpr lines etc
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Old Apr 13, 2011, 06:08 AM
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Originally Posted by recompile
Check the vacuum line on the fuel pressure regulator. Fuel pressure may not be increasing with boost like it should be.
+1
definitely sounds like the vacuum line fell off.
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Old Apr 13, 2011, 02:48 PM
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Vacuum lines are good, fpr is new... Boost leak test ok...
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Old Apr 14, 2011, 04:11 PM
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Check your injectors and fuel pump grommet.
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Old Apr 14, 2011, 10:41 PM
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Is your fpr adjustable? did you adjust it?
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Old Apr 20, 2011, 12:41 AM
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Originally Posted by 3K
Is your fpr adjustable? did you adjust it?

No, its a new oem fpr
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Old Apr 20, 2011, 11:54 AM
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Originally Posted by todd6027
lean spool
Originally Posted by scrivs
Nah, I wish.
Does that mean that leanspool is enabled or disabled?
Maybe you should post a log along with your maps so we can get a better picture of what's going on.
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Old Apr 20, 2011, 11:59 AM
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what was changed before this issue occurred?
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