UCUTEK AFR issue on the 2017+ BRZ/86 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Vloood · 01-22-2020, 06:15 PM

Ever since I went SC roughly six months ago on my 2018 brz, I've noticed that the AFR actual ( air to fuel ration ) has never matched up with the AFR target ( the set parameter by the tuner ). I contacted Delicious tuning, and they said this is a knows issue, and they have been working with ECUTEK to fix it; that was three months ago...delicious tuning and ECUTEK never made a public announcement about the issue I had to find out myself.

Regarding why the issue is happening, I wasn't told much, except for that some new code that was added to the 2017+ brz and 86 ECU that courses a sensor in the car to not accurately read AFR.

Has anyone experienced this? I've been kind of in the blue, and they haven't been telling me much about when it will be fixed.

If you have a 2017 brz/86 go look at your AFR and see if this is affecting you.

MotoX16 · 01-22-2020, 07:22 PM

I'm turbo'd on a 2017 with ecutek and I'm not sure what issue you're talking about. My afr's bounce around a few tenths but that's normal

Vloood · 01-22-2020, 07:24 PM

Quote:

Originally Posted by MotoX16

I'm turbo'd on a 2017 with ecutek and I'm not sure what issue you're talking about. My afr's bounce around a few tenths but that's normal

Who is your tuner though? delicious tuning?

86MLR · 01-22-2020, 07:25 PM

Turbo 86, 98 RON, Ecutek, no issues at all.

Tuned at Pulse Racing.

I believe there is some black magic with the port and DI injectors, I recall them talking about it, but, I really don't care about the finer art of tuning as long as it works.

MotoX16 · 01-22-2020, 07:26 PM

Quote:

Originally Posted by Vloood

Who is your tuner though? delicious tuning?

HRI

tomm.brz · 01-22-2020, 07:36 PM

post a log maybe so we can understand?

86TOYO2k17 · 01-22-2020, 08:00 PM

Yup, best place to start with potential tuning issues such as this is getting a log of the issue. Then working from there.

Vloood · 01-22-2020, 08:03 PM

Quote:

Originally Posted by tomm.brz

post a log maybe so we can understand?

This is what I got.

Vloood · 01-22-2020, 08:05 PM

Quote:

Originally Posted by 86TOYO2k17

Yup, best place to start with potential tuning issues such as this is getting a log of the issue. Then working from there.

Here is a log.

tomm.brz · 01-23-2020, 02:04 AM

Usually one uploads logs on datazap.me account and links it

tomm.brz · 01-23-2020, 02:49 AM

There is something very wrong in this tune, or your car

+20% of CL fuel correction and still 14 AFR during WOT pull

Either a leak somewhere or a problem with fuel delivery or a shitty tune

steve99 · 01-23-2020, 06:24 AM

What version of ecutek racerom is your tune ? If your running a 2017+ car then you want to avoid racerom version 10.x completly run latest version 11.1 or go back to vetsion 9. Version 10 on the 2017+ had many bugs, and even quite a few on pre 2017 cars.

Fred E · 01-23-2020, 07:33 AM

Quote:

Originally Posted by steve99

What version of ecutek racerom is your tune ? If your running a 2017+ car then you want to avoid racerom version 10.x completly run latest version 11.1 or go back to vetsion 9. Version 10 on the 2017+ had many bugs, and even quite a few on pre 2017 cars.

This is very likely the culprit. One of version 10's bugs was this exact issue of massive positive CL fuel correction value under WOT and huge negative fuel trims in in idle/cruise conditions with a very lean (16+) target AFR, like the ECU was actively trying to run as lean as possible.

thinkV · 01-23-2020, 09:39 PM

Have you spoken to HRI about this? what did he say?

01-22-2020, 07:25 PM	#4
86MLR Senior Member Join Date: Aug 2018 Drives: 2002 VX Commodore SS LS1 Auto Location: Sydney Posts: 2,203 Thanks: 500 Thanked 2,185 Times in 1,111 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	Turbo 86, 98 RON, Ecutek, no issues at all. Tuned at Pulse Racing. I believe there is some black magic with the port and DI injectors, I recall them talking about it, but, I really don't care about the finer art of tuning as long as it works. __________________ Disclaimer: This post represents the official views of the voices in my head at the time of posting. http://www.ft86club.com/forums/showthread.php?t=133311 I'm only here for the biscuits

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01-22-2020, 07:22 PM	#2
MotoX16 Senior Member Join Date: Jan 2019 Drives: 2017 Subaru BRZ Location: Minneapolis, MN Posts: 199 Thanks: 62 Thanked 95 Times in 54 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I'm turbo'd on a 2017 with ecutek and I'm not sure what issue you're talking about. My afr's bounce around a few tenths but that's normal

01-22-2020, 07:36 PM	#6
tomm.brz Senior Member Join Date: Jan 2017 Drives: brz 2017 hksv2 Location: italy Posts: 2,207 Thanks: 502 Thanked 1,070 Times in 778 Posts Mentioned: 65 Post(s) Tagged: 0 Thread(s)	post a log maybe so we can understand?

01-22-2020, 08:00 PM	#7
86TOYO2k17 Senior Member Join Date: Jan 2018 Drives: 2017 toyota 86 Location: PNW Posts: 2,131 Thanks: 336 Thanked 1,188 Times in 781 Posts Mentioned: 16 Post(s) Tagged: 0 Thread(s)	Yup, best place to start with potential tuning issues such as this is getting a log of the issue. Then working from there.

01-23-2020, 02:04 AM	#10
tomm.brz Senior Member Join Date: Jan 2017 Drives: brz 2017 hksv2 Location: italy Posts: 2,207 Thanks: 502 Thanked 1,070 Times in 778 Posts Mentioned: 65 Post(s) Tagged: 0 Thread(s)	Usually one uploads logs on datazap.me account and links it

01-23-2020, 02:49 AM	#11
tomm.brz Senior Member Join Date: Jan 2017 Drives: brz 2017 hksv2 Location: italy Posts: 2,207 Thanks: 502 Thanked 1,070 Times in 778 Posts Mentioned: 65 Post(s) Tagged: 0 Thread(s)	There is something very wrong in this tune, or your car +20% of CL fuel correction and still 14 AFR during WOT pull Either a leak somewhere or a problem with fuel delivery or a shitty tune

01-23-2020, 06:24 AM	#12
steve99 Banned Join Date: Dec 2013 Drives: FT86 Location: Australia Posts: 7,998 Thanks: 1,035 Thanked 4,988 Times in 2,982 Posts Mentioned: 598 Post(s) Tagged: 2 Thread(s)	What version of ecutek racerom is your tune ? If your running a 2017+ car then you want to avoid racerom version 10.x completly run latest version 11.1 or go back to vetsion 9. Version 10 on the 2017+ had many bugs, and even quite a few on pre 2017 cars.

01-23-2020, 09:39 PM	#14
thinkV Member Join Date: Mar 2018 Drives: BRZ Turbo Location: Australia Posts: 50 Thanks: 0 Thanked 13 Times in 11 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Have you spoken to HRI about this? what did he say?

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