Maft Pro Lean during boost

[TomFraser]

I have my maft pro tuned almost perfectly and one of my last issues is that under "HIGH" (MAP of 130 and higher) when boosting (even 1PSI), AFR will be about 11-12 for a couple seconds of boost, then it suddenly drops to below what the meter can read (10) and if I continued to hold the throttle it would hit fuel cut.

This does not happen when in MID and boosting, only HIGH and I have up to 4 seconds of boost before the drop to 10 happens

Are some of my setting possibly messed up? I will post them all tonight when I can hook up the car's laptop to the internet

I'm only boosting to 9psi so the fuel pump/440s should not have any issues, right?

I haven't touch AFR tracking at all so that might be some of my issue,

 

[lewis15498]

I have my maft pro tuned almost perfectly and one of my last issues is that under "HIGH" (MAP of 130 and higher) when boosting (even 1PSI), AFR will be about 11-12 for a couple seconds of boost, then it suddenly drops to below what the meter can read (10) and if I continued to hold the throttle it would hit fuel cut.

This does not happen when in MID and boosting, only HIGH and I have up to 4 seconds of boost before the drop to 10 happens

Are some of my setting possibly messed up? I will post them all tonight when I can hook up the car's laptop to the internet

I'm only boosting to 9psi so the fuel pump/440s should not have any issues, right?

I haven't touch AFR tracking at all so that might be some of my issue,

The issue isnt your car or the MAFT Pro mate, its you. You got it backwards, your running rich not lean. an AFR is A:F not F:A fuel is always 1 so when you go from 12:1 to <10:1 that means that your getting <10 parts of air to 1 part of fuel, i.e. too rich. Because you thought it was too lean im guessing you tried to add more fuel, making it even richer, and didnt realize it b/c you were beond your widebands range. Go back and lean out your fuel and you should be fine. BTW dont go beond 12:1 @ WOT cuz you will risk going kaboom, you might want to do some more research on AFR tuning before you take another stab at it, because if you had made this mistake in the opposite direction you would have likely trashed your motor.

 

[lewis15498]

If your wideband is hooked up to your maft pro im pretty sure it has autotune capability. Might be something you want to look into.

 

[sneakypete]

there is no autotune capability on the maftpro. you can set your desired AFR at wot per rpm via the wot settings. the hi load adjustment is for fine tuning the wot settings.
-pete

 

[grimreaper]

"wot tracking" should be the fine tune portion. Use "user tune" to get wot close and let the tracking do the rest. I highly suggest you monitor timing as you can very easily pull a LOT of fuel with everything combined (mainscale+ user tune+ wot tracking).

100-130 kpa is that weird range where the ecu is still in closed loop usually. be careful boosting here until you force a safe af ratio. Mine is 14-15 af ratio with out tuning...