Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB
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Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB (https://www.ft86club.com/forums/index.php)
-   Engine, Exhaust, Transmission (https://www.ft86club.com/forums/forumdisplay.php?f=8)
-   -   Normal LTFT?? (https://www.ft86club.com/forums/showthread.php?t=113619)

dillanp86 12-08-2016 03:16 PM
Normal LTFT??
 
My LTFT is constantly between -5 to -2. After the engine is warmed and I give it some WOT, it will flatline at 0.00 and MAYBE go up to 2.67ish. Just wondering if this is normal before going to OFT E85. Currently running stage one OFT. Car is bone stock besides OFT.
Thanks :)


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Kodename47 12-08-2016 03:21 PM
Quote:
Originally Posted by dillanp86 (Post 2810974)
My LTFT is constantly between -5 to -2. After the engine is warmed and I give it some WOT, it will flatline at 0.00 and MAYBE go up to 2.67ish. Just wondering if this is normal before going to OFT E85. Currently running stage one OFT. Car is bone stock besides OFT.
Thanks :)
Normal

dillanp86 12-08-2016 03:22 PM
Quote:
Originally Posted by Kodename47 (Post 2810981)
Normal


I love you thanks. E85 here I come


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theadmiral976 12-08-2016 03:23 PM
Generally speaking, your car is fine. LTFTs between -5% and +5% indicate relatively balanced fuel trims all things considered. Since you are hovering around -5% at idle, your car is running slightly rich (pulling fuel, hence the -%). At WOT, all fuel trims (STFT and LTFT) peg at 0% as the car switches from closed loop to open loop, so your observation is exactly as expected.

To be 100% sure of everything, we would need to know your STFTs as well. If they are wildly off, it could indicate a problem depending on the direction. Also good to know if you have any mods that affect air or fuel flow/metering or exhaust gas travel paths.

dillanp86 12-08-2016 03:25 PM
Quote:
Originally Posted by theadmiral976 (Post 2810985)
Generally speaking, your car is fine. LTFTs between -5% and +5% indicate relatively balanced fuel trims all things considered. Since you are hovering around -5% at idle, your car is running slightly rich (pulling fuel, hence the -%). At WOT, all fuel trims (STFT and LTFT) peg at 0% as the car switches from closed loop to open loop, so your observation is exactly as expected.



To be 100% sure of everything, we would need to know your STFTs as well. If they are wildly off, it could indicate a problem depending on the direction. Also good to know if you have any mods that affect air or fuel flow/metering or exhaust gas travel paths.


STFT levels are constant around -1 to +5. Nothing too crazy.


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Kodename47 12-08-2016 03:25 PM
Quote:
Originally Posted by theadmiral976 (Post 2810985)
To be 100% sure of everything, we would need to know your STFTs as well. If they are wildly off, it could indicate a problem depending on the direction. Also good to know if you have any mods that affect air or fuel flow/metering or exhaust gas travel paths.
Seeing as LTFT is set by the consistency of STFTs, I'm pretty sure we know what the STFTs are likely to be ;)

theadmiral976 12-08-2016 03:26 PM
Ah, sorry, didn't see your mod list. OFT maps generally cause a slight rich condition as they want to be safe to mitigate differences in fuel quality. Assuming your STFTs are +/-5%, everything is perfectly fine. :thumbup:

dillanp86 12-08-2016 03:26 PM
Help needed! Check engine light after weird traction lights.

https://r.tapatalk.com/shareLink?url...1&share_type=t


Can u guys check that? I posted last night about the same issue but out the wrong title and go 1 reply.


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theadmiral976 12-08-2016 03:27 PM
Quote:
Originally Posted by Kodename47 (Post 2810988)
Seeing as LTFT is set by the consistency of STFTs, I'm pretty sure we know what the STFTs are likely to be ;)
Yes, I agree that this is true assuming the STFTs are fluctuating in a reproducible manner based on throttle input and load. However, my understanding is that if there is a variable issue causing the STFT values to swing, the LTFTs may not reflect STFTs accurately. Maybe I'm wrong...

theadmiral976 12-08-2016 03:32 PM
Quote:
Originally Posted by dillanp86 (Post 2810990)
Help needed! Check engine light after weird traction lights.

https://r.tapatalk.com/shareLink?url...1&share_type=t


Can u guys check that? I posted last night about the same issue but out the wrong title and go 1 reply.


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Steve is very knowledgeable. I agree with his response: i.e. clear the codes and see if they return. If they do, your best bet is to go to the dealer (after flash back to stock). In terms of the OBDII connector, I don't remember off the top of my head, but I'm pretty sure that several pins are unused by OFT (hence they're missing in the OFT-side plug).

theadmiral976 12-08-2016 03:34 PM
Quote:
Originally Posted by dillanp86 (Post 2810987)
STFT levels are constant around -1 to +5. Nothing too crazy.


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Awesome! Looks good to me.:thumbup:

Tokay444 12-08-2016 04:14 PM
Generally speaking, anything below +/-8% is considered nothing to worry about.

guybo 12-08-2016 04:23 PM
Check your fuel trims at idle and 2500 RPM. You want them less than -/+10%. LTFT + STFT is your total fuel trim and that's what you want under 10.

Sel_brz17 05-07-2018 09:55 PM
MY Stft trim hovers arund -3%, which i think is fine.... myltft on the other hand hovers around -19% on idle and -15% while driving. I do believe its bc i got an injen intake on there. SHould i be worried? I really dont wanna take off injen intake but will do so if needed. What can happen if I continue to run my car at these readings? Thank you!


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