Help me understand my log
Posted: Sun Apr 30, 2006 3:36 am
I have 04 USDM Forester XT, buy engine is essentially stage 2 STI (with vf39, sti tmic...etc)
Couple of things:
1) MAF sensor tells me the amount of volume of air coming into the intake independent of anything else right ? Does that mean that if in 3rd gear, 5000rpm, at 15.8 psi, if MAF is 250g/s, and in 4th gear at 5000 rpm at 16.8psi, also showing 250g/s, means that the power is the same at both cases ? And does this mean that in 4th gear, I'm essentially blowing hot air, since despite an extra psi in boost, I'm still getting the same MAF reading ?
2) My fuel trim #3 (long term fuel trim right ?) is showing -45 to -55, does this mean my car is running REALLY rich ? Which maps do I need to change to adjust this ?
3) My car's ecu is tuned for 91 octaine.. but I have 94 octane here.. boost seems to be max'ed out at 18psi on a vf39, so I don't want to go higher, but what else can I change to make more power, and take advantage of the 94 octane... advance timing ?
4) Lastly, is there an easy way to tell from my logs whether I have an intake leak or not ?
Couple of things:
1) MAF sensor tells me the amount of volume of air coming into the intake independent of anything else right ? Does that mean that if in 3rd gear, 5000rpm, at 15.8 psi, if MAF is 250g/s, and in 4th gear at 5000 rpm at 16.8psi, also showing 250g/s, means that the power is the same at both cases ? And does this mean that in 4th gear, I'm essentially blowing hot air, since despite an extra psi in boost, I'm still getting the same MAF reading ?
2) My fuel trim #3 (long term fuel trim right ?) is showing -45 to -55, does this mean my car is running REALLY rich ? Which maps do I need to change to adjust this ?
3) My car's ecu is tuned for 91 octaine.. but I have 94 octane here.. boost seems to be max'ed out at 18psi on a vf39, so I don't want to go higher, but what else can I change to make more power, and take advantage of the 94 octane... advance timing ?
4) Lastly, is there an easy way to tell from my logs whether I have an intake leak or not ?