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Old 07-11-2012, 07:48 PM   #1
arf80
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Default Logging for boost leaks

I'm currently running the Cobb Stage 2 map. Which parameters should I be logging for boost leaks? I'm assuming some combination of the A/F Correction and A/F Learning, as well as Calculated load. Thanks.
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Old 07-12-2012, 10:11 AM   #2
Cobb Tuning
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Quote:
Originally Posted by arf80 View Post
I'm currently running the Cobb Stage 2 map. Which parameters should I be logging for boost leaks? I'm assuming some combination of the A/F Correction and A/F Learning, as well as Calculated load. Thanks.
Intake tract leaks will generally appear as more extreme corrections in one or more of the A/F Learning 1 A, B, C, D values. You don't have to log these really - you can simply take a peak at them using the live data feature, even with the engine off (ignition on). But, you will need a good amount of driving (say enough to run through a full tank of gas) for them to populate accurately since you last reflashed a map, reset the ECU, or disconnected the car's battery (all of which clear the A/F Learning 1 and other learned parameters of the ECU).

A general rule of thumb for A/F Learning 1 is that they should be within +/- 5% with outside of +/-8% indicating a potential issue. The 08+ STi tends to have more extreme corrections (even when there isn't a problem), so the +/- 8% rule is more applicable there.

Boost leaks will tend to show up as extreme negative corrections (where you are losing metered air), while other leaks (where you are gaining above the metered air) will show up as extreme positive corrections.

Bill
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