What do these LTFT's mean for my car?

reefer_bob · 08-04-2005, 07:35 AM

Bank 1 Idle: -1.5%
Bank 1 WOT: -4.7%

Bank 2 Idle: -1.5%
Bank 2 WOT: -5.5%

Stage 1 MTM, X-1 racer Intake, 91 octane, Lemitweaked.

RSAVIPER · 08-04-2005, 07:44 AM

DAP@EPL · 08-04-2005, 07:54 AM

Negative LTFTs mean that the car is correcting for rich conditions at idle/part throttle.

The Bentley manual says anything within +/- 4% is fine but chiptuning and intake modifications will affect fuel trims so I think as long as you are within +/- 10% you are ok.

The car can correct up to +/-25%, at which point it'll throw a system too rich/lean DTC.

-Dave Pramanik

DAP@EPL · 08-04-2005, 07:56 AM

reefer_bob · 08-04-2005, 08:41 AM

PSmalls::DoggieStyle · 08-04-2005, 09:20 AM

Mike2kS4 · 08-04-2005, 09:43 AM

PSmalls::DoggieStyle · 08-04-2005, 09:44 AM

Mike2kS4 · 08-04-2005, 09:59 AM

PSmalls::DoggieStyle · 08-04-2005, 10:00 AM

Most cars I've seen with AMS are right around negative 4.x-5.x%

edit....

And stop calling it AMS/ABT, jackass. Get it through your thick skull that it's not ABT...not even a little bit! <ctrl 7 infinite times>

08-04-2005, 07:35 AM	#1
reefer_bob AudiWorld Super User Account #: 45294 Join Date: Oct 2002 Posts: 14,334	What do these LTFT's mean for my car? Bank 1 Idle: -1.5% Bank 1 WOT: -4.7% Bank 2 Idle: -1.5% Bank 2 WOT: -5.5% Stage 1 MTM, X-1 racer Intake, 91 octane, Lemitweaked. __________________ Reefer_Bob. AIM: reeferbob R.I.P. Matthew Ammon aka O.W. Kenobi

08-04-2005, 07:44 AM	#2
RSAVIPER AudiWorld Senior Member Account #: 85203 Join Date: Dec 2004 Posts: 693	From what i understand, those are pretty good. __________________ AWE K04 kit, EVO Intake, Labree DPs, ASP Tru-dual exhaust, H&R springs, B&M SS, 18" ADR M-Classics, M3 lip spoiler, RS4 motor mounts, APR snub, RS4 clutch, RS4 intercoolers, Forge DV's, E-codes. My Website

08-04-2005, 07:54 AM	#3
DAP@EPL Audiworld Sponsor Account #: 6924 Join Date: Jun 2000 Posts: 19,700	Looks fine. Negative LTFTs mean that the car is correcting for rich conditions at idle/part throttle. The Bentley manual says anything within +/- 4% is fine but chiptuning and intake modifications will affect fuel trims so I think as long as you are within +/- 10% you are ok. The car can correct up to +/-25%, at which point it'll throw a system too rich/lean DTC. -Dave Pramanik __________________

08-04-2005, 07:56 AM	#4
DAP@EPL Audiworld Sponsor Account #: 6924 Join Date: Jun 2000 Posts: 19,700	Out of curiosity, do you know what your LTFTs were before the X-1 racer intake? __________________

08-04-2005, 08:41 AM	#5
reefer_bob AudiWorld Super User Account #: 45294 Join Date: Oct 2002 Posts: 14,334	Nope, but when I do my testing, I will re-set, and do some extended driving... __________________ Reefer_Bob. AIM: reeferbob R.I.P. Matthew Ammon aka O.W. Kenobi

08-04-2005, 09:20 AM	#6
PSmalls::DoggieStyle Elder Member Account #: 69223 Join Date: Jan 2004 Posts: 30,257	2nd, although I never heard the +/-4% Bentley thing before.

08-04-2005, 09:43 AM	#7
Mike2kS4 Elder Member Account #: 38083 Join Date: Jun 2002 Posts: 12,096	It means you most-likely added fuel w/lemmi and probably made your car faster ;) Fine. __________________ 2002 S4 Avant, 6spd. Bone stock. <a href="http://www.autospeed.us"> </a> Caveat: Any advice I express regarding potential tuning and such is purely informational. If your knowledge and abilities are not up to the task, no amount of advice can assist.

08-04-2005, 09:44 AM	#8
PSmalls::DoggieStyle Elder Member Account #: 69223 Join Date: Jan 2004 Posts: 30,257	Hmm, why do you say that? Those seem like non tweaked chipped LTFTs to me....

08-04-2005, 09:59 AM	#9
Mike2kS4 Elder Member Account #: 38083 Join Date: Jun 2002 Posts: 12,096	AMS/ABT? I normally see AMS at around 2.. and that's at sea-level. __________________ 2002 S4 Avant, 6spd. Bone stock. <a href="http://www.autospeed.us"> </a> Caveat: Any advice I express regarding potential tuning and such is purely informational. If your knowledge and abilities are not up to the task, no amount of advice can assist.

08-04-2005, 10:00 AM	#10
PSmalls::DoggieStyle Elder Member Account #: 69223 Join Date: Jan 2004 Posts: 30,257	Normally? How many have you seen? edit :) Most cars I've seen with AMS are right around negative 4.x-5.x% edit.... And stop calling it AMS/ABT, jackass. Get it through your thick skull that it's not ABT...not even a little bit! <ctrl 7 infinite times>

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