LTFT

dreptroman · 07-26-2016, 02:13 PM

Dear All,

I am trying to determine whether I have a problem or not with the MHD Stage 1 + FMIC map.

I have had once a Cylinder 2 missfire and tried to log a short acceleration today..

http://www.datazap.me/u/dreptroman/l...0&mark=234-397

I am unsure how to read the ltft stft. I am under the impression that it shouldn't have been more than +- 10 but in my case it goes lower.

Can you help me diagnose any problems with the tune and/or engine components based on this log?

Thx

dreptroman · 07-27-2016, 06:07 AM

Bump

Sshec152 · 07-27-2016, 07:05 AM

STFT is a real time measurement showing how much fuel its adding or removing, LTFT measures how much fuel its adding or removing over a period of time. A negative percent means its removing fuel and a positive percent means its adding fuel. Generally youd like to see fuel trims at +/-10%. With all of that said i dont know how to read logs very well but it appears your LTFT are at 17% which would be cause for concern.

jtswole · 07-27-2016, 08:06 AM

You need to do a proper log first. WOT from 2k rpm to 6500rpm or so. In 3rd or 4th gear.

dreptroman · 07-27-2016, 12:30 PM

I ll log properly but have no space to do it till the weekend

) I can't just drive around the city with 130 mph lol so I can Log.

keep you posted

dreptroman · 07-28-2016, 11:43 AM

http://www.datazap.me/u/dreptroman/wot-targoviste

there it is

07-26-2016, 02:13 PM	#1
dreptroman Private 10 Rep 50 Posts Drives: 320d Join Date: Mar 2011 Location: Sofia iTrader: (0)	LTFT - Fuel Trim HELP diagnostic MHD Log Dear All, I am trying to determine whether I have a problem or not with the MHD Stage 1 + FMIC map. I have had once a Cylinder 2 missfire and tried to log a short acceleration today.. http://www.datazap.me/u/dreptroman/l...0&mark=234-397 I am unsure how to read the ltft stft. I am under the impression that it shouldn't have been more than +- 10 but in my case it goes lower. Can you help me diagnose any problems with the tune and/or engine components based on this log? Thx
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07-27-2016, 06:07 AM	#2
dreptroman Private 10 Rep 50 Posts Drives: 320d Join Date: Mar 2011 Location: Sofia iTrader: (0)	Bump
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07-27-2016, 07:05 AM	#3
Sshec152 Private First Class 41 Rep 160 Posts Drives: 2007 335i coupe Join Date: Jun 2015 Location: Delaware county iTrader: (0)	STFT is a real time measurement showing how much fuel its adding or removing, LTFT measures how much fuel its adding or removing over a period of time. A negative percent means its removing fuel and a positive percent means its adding fuel. Generally youd like to see fuel trims at +/-10%. With all of that said i dont know how to read logs very well but it appears your LTFT are at 17% which would be cause for concern.
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07-27-2016, 08:06 AM	#4
jtswole First Lieutenant 42 Rep 380 Posts Drives: 335i Join Date: Mar 2014 Location: FL iTrader: (1)	You need to do a proper log first. WOT from 2k rpm to 6500rpm or so. In 3rd or 4th gear. __________________ Cam only...
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07-27-2016, 12:30 PM	#5
dreptroman Private 10 Rep 50 Posts Drives: 320d Join Date: Mar 2011 Location: Sofia iTrader: (0)	I ll log properly but have no space to do it till the weekend ) I can't just drive around the city with 130 mph lol so I can Log. keep you posted
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07-28-2016, 11:43 AM	#6
dreptroman Private 10 Rep 50 Posts Drives: 320d Join Date: Mar 2011 Location: Sofia iTrader: (0)	http://www.datazap.me/u/dreptroman/wot-targoviste there it is
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