Fuel trims when tuned (EuroCharged)
08-27-2016, 10:54 AM
#1
Super Member
Thread Starter
Fuel trims when tuned (EuroCharged)
Hey all,
wondering if someone can chime in and confirm a few things for me:
1. What is the correct range LTFT for a stock car? +/-5%, correct?
2. How about with a tune? Can anyone tell where LTFT's should be with a tune? Specifically Jerry's (EuroCharged) mail-order tune?
3. And everywhere i look i hear different things about this. Does +5% LTFT mean car is running rich so ECU is pulling fuel back OR is +5% mean car is running lean so ECU is adding extra fuel?
Im totally stock with the EC mail-order tune and my LTFT are +4% to +4.5%. Wondering if im running a bit lean or rich and if this is normal considering i have a tune.
Thanks in advance!
wondering if someone can chime in and confirm a few things for me:
1. What is the correct range LTFT for a stock car? +/-5%, correct?
2. How about with a tune? Can anyone tell where LTFT's should be with a tune? Specifically Jerry's (EuroCharged) mail-order tune?
3. And everywhere i look i hear different things about this. Does +5% LTFT mean car is running rich so ECU is pulling fuel back OR is +5% mean car is running lean so ECU is adding extra fuel?
Im totally stock with the EC mail-order tune and my LTFT are +4% to +4.5%. Wondering if im running a bit lean or rich and if this is normal considering i have a tune.
Thanks in advance!
08-28-2016, 12:37 PM
#2
Super Member
Thread Starter
Hey all,
wondering if someone can chime in and confirm a few things for me:
1. What is the correct range LTFT for a stock car? +/-5%, correct?
2. How about with a tune? Can anyone tell where LTFT's should be with a tune? Specifically Jerry's (EuroCharged) mail-order tune?
3. And everywhere i look i hear different things about this. Does +5% LTFT mean car is running rich so ECU is pulling fuel back OR is +5% mean car is running lean so ECU is adding extra fuel?
Im totally stock with the EC mail-order tune and my LTFT are +4% to +4.5%. Wondering if im running a bit lean or rich and if this is normal considering i have a tune.
Thanks in advance!
wondering if someone can chime in and confirm a few things for me:
1. What is the correct range LTFT for a stock car? +/-5%, correct?
2. How about with a tune? Can anyone tell where LTFT's should be with a tune? Specifically Jerry's (EuroCharged) mail-order tune?
3. And everywhere i look i hear different things about this. Does +5% LTFT mean car is running rich so ECU is pulling fuel back OR is +5% mean car is running lean so ECU is adding extra fuel?
Im totally stock with the EC mail-order tune and my LTFT are +4% to +4.5%. Wondering if im running a bit lean or rich and if this is normal considering i have a tune.
Thanks in advance!
08-28-2016, 11:02 PM
#4
08-28-2016, 11:17 PM
#5
Super Member
Thread Starter
Did some more data-logging today. Seems like the car leans out more with the AC on... I cant figure that one out... How does the AC have anything to do with fuel trims...
With AC off im showing LTFT +3%. Within 5 mins of AC being on, jumps upto +4%. Shut AC off, falls back to 3% within 5mins. Weird...
Also, bank 1 seems to pretty consistently be +0.5 to + 1% higher than bank 2. They even out for a while but then bank 1 goes back to being more positive most of the time. Never saw bank 2 be more positive. I drove for 3 hrs (140 miles), outside temp 85-90*F.
Does this sound like normal behavior and numbers? If anyone out there is tuned and wouldnt mind doing a little data-logging, id appreciate it big time. Just dont want to go chasing my own tail if this is all normal.
Thank you!
With AC off im showing LTFT +3%. Within 5 mins of AC being on, jumps upto +4%. Shut AC off, falls back to 3% within 5mins. Weird...
Also, bank 1 seems to pretty consistently be +0.5 to + 1% higher than bank 2. They even out for a while but then bank 1 goes back to being more positive most of the time. Never saw bank 2 be more positive. I drove for 3 hrs (140 miles), outside temp 85-90*F.
Does this sound like normal behavior and numbers? If anyone out there is tuned and wouldnt mind doing a little data-logging, id appreciate it big time. Just dont want to go chasing my own tail if this is all normal.
Thank you!
08-28-2016, 11:28 PM
#6
All normal
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09-15-2016, 04:45 PM
#8
Super Member
Thread Starter
Is it not concerning that i never see it go towards the richer side? Its ALWAYS in the +, meaning slightly lean.
I just want to chase down a vacuum leak if there is one, on the other hand, i dont want to go on a wild goose chase if there is no vacuum leak.
Lastly, can my vacuum readings tell me if ive got a vacuum leak somewhere? What should i be seeing at idle?
I just want to chase down a vacuum leak if there is one, on the other hand, i dont want to go on a wild goose chase if there is no vacuum leak.
Lastly, can my vacuum readings tell me if ive got a vacuum leak somewhere? What should i be seeing at idle?
Last edited by V-AMG; 09-16-2016 at 03:37 AM.
