Injector fuel trim multiplier
Thread Starter
Instructor
Joined: Jun 2004
Posts: 190
Likes: 0
Injector fuel trim multiplier
Long story short, after putting a new cam and other goodies into my 94 lt1, I had the computer reprogrammed by mail. Needless to say, I was dissappointed when I went from a 13.2 with only header, exhaust, 3.73 and 1.6 rr to a 14.1 (slower than stock!). So I finally got tuner cat and am looking around at the values that were on the computer. The injector trim multipliers off idle were as follows:
1 0.00
8 0.47
4 1.06
3 1.05
6 1.05
5 1.00
7 1.05
2 1.00
As far as I can tell with my math background (limited), the number 1 injector will never be cycling (number x 0=0). However, with my computer background (more or less none) this seems like far too obvious of an oversight to be a mistake. Any input would be greatly be appreciated.
As a side note, when I just got my car smogged (failed 5 times even after new cats) the left bank was far dirtier than the right (no crossover pipe in the exhaust).
1 0.00
8 0.47
4 1.06
3 1.05
6 1.05
5 1.00
7 1.05
2 1.00
As far as I can tell with my math background (limited), the number 1 injector will never be cycling (number x 0=0). However, with my computer background (more or less none) this seems like far too obvious of an oversight to be a mistake. Any input would be greatly be appreciated.
As a side note, when I just got my car smogged (failed 5 times even after new cats) the left bank was far dirtier than the right (no crossover pipe in the exhaust).
Safety Car
Joined: Dec 2002
Posts: 3,655
Likes: 24
From: Charleston SC
I agree that #1 was an over site but I would question #8 as well. Hey I am not a tuner but I did saty at a Holiday inn last night. JK but I looked at 7 bins with similar set ups to yours and all the injector trims are around 1.00 with some a little lower (.9x) and some a little higher 1.0x but not one of them is lower then .8x
Drifting
Joined: May 2003
Posts: 1,730
Likes: 1
From: Charlotte NC
St. Jude Donor '05
Originally Posted by skunklookingcar
Long story short, after putting a new cam and other goodies into my 94 lt1, I had the computer reprogrammed by mail. Needless to say, I was dissappointed when I went from a 13.2 with only header, exhaust, 3.73 and 1.6 rr to a 14.1 (slower than stock!). So I finally got tuner cat and am looking around at the values that were on the computer. The injector trim multipliers off idle were as follows:
1 0.00
8 0.47
4 1.06
3 1.05
6 1.05
5 1.00
7 1.05
2 1.00
As far as I can tell with my math background (limited), the number 1 injector will never be cycling (number x 0=0). However, with my computer background (more or less none) this seems like far too obvious of an oversight to be a mistake. Any input would be greatly be appreciated.
As a side note, when I just got my car smogged (failed 5 times even after new cats) the left bank was far dirtier than the right (no crossover pipe in the exhaust).
1 0.00
8 0.47
4 1.06
3 1.05
6 1.05
5 1.00
7 1.05
2 1.00
As far as I can tell with my math background (limited), the number 1 injector will never be cycling (number x 0=0). However, with my computer background (more or less none) this seems like far too obvious of an oversight to be a mistake. Any input would be greatly be appreciated.
As a side note, when I just got my car smogged (failed 5 times even after new cats) the left bank was far dirtier than the right (no crossover pipe in the exhaust).
I dont' know who did your tuning but its possible they moved some tables around. Some guys do this in an attempt to hide there work and you can tell they've done this because the bin will looked scrambled.
Other than that it could be a programming glitch. After all, these computers aren't guarenteed to take the program 100% correct 100% of the itme.
I would contact who ever did your tune.
Thread Starter
Instructor
Joined: Jun 2004
Posts: 190
Likes: 0
Thank you FD2BLK and ALVIN for your responses. I don't think the bin is scrambled since all the other tables I looked at seemed reasonable. Maybe I will contact my tuner again, although every other time I contacted him, he flat out denied that there would be anything wrong with the tune, and told me there was something else wrong with my car (never suggesting me to send any data so he could possibly help). So, after I couldn't find any faults, I took it to several shops, who also found nothing wrong with any sensors or components of the fuel system. Since I was confident at that point that there was a programming glitch, I ponied up and bought a laptop and the necessary software.
