joeym4130
15+ Year Contributor
- 296
- 2
- Dec 8, 2003
-
philly,
Pennsylvania
Hey guys, i hope you can help give me advice on what to do!
This may be long, but i hope it can give a most accurate description so i can be pointed in the right direction:
Heres a quick story, I bought i in the winter and I ran it all winter with 8psi just cause whos gonna boost in the snow! haha. Over the winter I've added some things to the car and never turned the boost up until today. A week ago a horrible thing happened however, I was driving the 6 hour drive home from school and my dad drove 3 hours while i slept and apparently he stopped for gas while i was sleeping and put 89 in it!!
So i logged it then and there was no knock and good timing so i figured the 89 was good for the 8psi. I ran the tank out and filled up with 93 again today. ahhh! 
So now i wanted to up the boost with my 93. Heres todays events:
I did a base run with the boost @ 8psi (3rd gear, 93octane, MMcd to log). On my o2, i got average of .92v and 18deg timing. Once i hit around 5650RPM, my o2s went to .94 and timing to 20, which was my max timing advance. No knock.
The next run i increased boost to about 13psi and tried again. My o2 were down a bit, average of about .88-.90 and my timing was all over lowest 11deg, highest 16deg, and i was getting a lot of knock counts (peak knock was a 19 count
). I quickly turned the boost down.... 
Finally i set the boost at 10psi and tried once more. This time i had a steady o2 of .91 the o2 did not move at all, it was truely .91 the entire RPM range, and a nice steady timing curve of 18deg almost steady. I had 3 instances of a 1-count knock, only occuring in the lower-to-mid RPM range. As the RPMs climbed, the knock lessened. This is where i left it for now until i know what to do. My fuel trims upon stopping the logging was FTRL-101.5%, FTRM-91.4%, FTRH-104.6%
Another Question i had, is why in every gear at full boost does the MAFS stay maxed at 1603.9Hz? Is that just the max air my engine can intake at 10psi?
I found it weird that the knock usually occured the most at medium RPMs around 4000-5000 and that my FTRM was only at 91.4%. I'm unplugging the battery and am going to have the ECU relearn everything, I'm hoping that the problem was that the ecu changed all the trims upon getting the 89octane, and is messed up with those med trims. How long does it take to re-learn? I was going to let it idle for about 10mins to learn the low, then just cruise for a half hour and let it do its thing. My friend said I might need a bigger fuel pump, but I dont see why, I have read about guys doing more mods then me and not needing a pump!! Let me know what u guys think. I have a 3" exhaust on the way and want to make sure i can actually enjoy it
Here are my mods so u dont have to look for them:
91 Talon Tsi
Joe P. MBC
K&N open element filter
3" Intake pipe
DejonTool hard IC piping
Balance Shafts Removed
Ported Ex. Manifold
Ported turbine housing
This may be long, but i hope it can give a most accurate description so i can be pointed in the right direction:
Heres a quick story, I bought i in the winter and I ran it all winter with 8psi just cause whos gonna boost in the snow! haha. Over the winter I've added some things to the car and never turned the boost up until today. A week ago a horrible thing happened however, I was driving the 6 hour drive home from school and my dad drove 3 hours while i slept and apparently he stopped for gas while i was sleeping and put 89 in it!!
So i logged it then and there was no knock and good timing so i figured the 89 was good for the 8psi. I ran the tank out and filled up with 93 again today. ahhh! So now i wanted to up the boost with my 93. Heres todays events:I did a base run with the boost @ 8psi (3rd gear, 93octane, MMcd to log). On my o2, i got average of .92v and 18deg timing. Once i hit around 5650RPM, my o2s went to .94 and timing to 20, which was my max timing advance. No knock.
The next run i increased boost to about 13psi and tried again. My o2 were down a bit, average of about .88-.90 and my timing was all over lowest 11deg, highest 16deg, and i was getting a lot of knock counts (peak knock was a 19 count
). I quickly turned the boost down.... Finally i set the boost at 10psi and tried once more. This time i had a steady o2 of .91 the o2 did not move at all, it was truely .91 the entire RPM range, and a nice steady timing curve of 18deg almost steady. I had 3 instances of a 1-count knock, only occuring in the lower-to-mid RPM range. As the RPMs climbed, the knock lessened. This is where i left it for now until i know what to do. My fuel trims upon stopping the logging was FTRL-101.5%, FTRM-91.4%, FTRH-104.6%
Another Question i had, is why in every gear at full boost does the MAFS stay maxed at 1603.9Hz? Is that just the max air my engine can intake at 10psi?
I found it weird that the knock usually occured the most at medium RPMs around 4000-5000 and that my FTRM was only at 91.4%. I'm unplugging the battery and am going to have the ECU relearn everything, I'm hoping that the problem was that the ecu changed all the trims upon getting the 89octane, and is messed up with those med trims. How long does it take to re-learn? I was going to let it idle for about 10mins to learn the low, then just cruise for a half hour and let it do its thing. My friend said I might need a bigger fuel pump, but I dont see why, I have read about guys doing more mods then me and not needing a pump!! Let me know what u guys think. I have a 3" exhaust on the way and want to make sure i can actually enjoy it
Here are my mods so u dont have to look for them:
91 Talon Tsi
Joe P. MBC
K&N open element filter
3" Intake pipe
DejonTool hard IC piping
Balance Shafts Removed
Ported Ex. Manifold
Ported turbine housing
