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Old 11-21-2006, 05:17 PM   #22
Jon [in CT]
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Member#: 2992
Join Date: Nov 2000
Chapter/Region: NESIC
Location: Connecticut, USA
Vehicle:
02 WRX Sedan
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Quote:
Originally Posted by jaxscuby View Post
well the injector scale always had head room from
the factory. this way if you went static you still had
40~50cc of fuel left.

Ecutek, showed pinks to flow 500, when we know they flow ~540 to 550.
sti yellow side feed to flow 498, when we know they flow ~540 to 550.
wrx dk blu top feed to flow 500, when we know they flow ~540 to 550.

so you can see the trend and summize.

back to st / lt fuel trim.
maf scale table in ecutek, to check st
activate the table trace the cursor, double check
with deltadash for the percentage and adjust.
The injector scale from the factory tells the ECU how long it must inject fuel to match one gram of air intake to achieve a stoichiometric A/F ratio. If you know your fuel's specific density and stoichiometric A/F ratio, then you can convert that time scale factor to a cc/min flow. It appears to me that the factory engineers used reasonable estimates for those two unknowns. I have no idea how EcuTeK arrived at the conversion factor they use for the injector scale.

There's no reason to change MAF scaling when the only physical change is new injectors.
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