*SOLVED* Inconsistent power output - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Lantanafrs2 · 09-18-2022, 09:17 PM

Cams sticking?

NoHaveMSG · 09-19-2022, 04:17 PM

Quote:

Originally Posted by Rako

new logs

warm idle
http://datazap.me/u/stix/warm-idle?log=0&data=4

normal driving
http://datazap.me/u/stix/normal-driving?log=0&data=4

From my limited knowledge nothing really stands out except for the way the ignition advance is fluctuating. I am not a tuner/tuning expert so I can't really comment on how normal that is. IAM is steady, LTFT look fine, AFR is following command, no knock correction.

I would think if it was an AVCS issue it would pop a code.

blsfrs · 09-19-2022, 08:58 PM

Quote:

Originally Posted by NoHaveMSG

From my limited knowledge nothing really stands out except for the way the ignition advance is fluctuating. I am not a tuner/tuning expert so I can't really comment on how normal that is. IAM is steady, LTFT look fine, AFR is following command, no knock correction.

I would think if it was an AVCS issue it would pop a code.

Would a bad crank sensor cause the timing to fluctuate?

NoHaveMSG · 09-19-2022, 09:02 PM

Quote:

Originally Posted by blsfrs

Would a bad crank sensor cause the timing to fluctuate?

Not sure. I am not even entirely certain it’s not normal. It just looks odd to me.

Rako · 09-19-2022, 10:17 PM

Yeah that's the thing, it looks normal for the most part..

Rako · 09-19-2022, 10:18 PM

Quote:

Originally Posted by Lantanafrs2

Cams sticking?

How can you tell?

Lantanafrs2 · 09-20-2022, 05:43 AM

Quote:

Originally Posted by Rako

How can you tell?

I think a data log should show it. Sticky cams were an issue early on.

makinen · 09-20-2022, 10:39 PM

Quote:

Originally Posted by NoHaveMSG

I would think if it was an AVCS issue it would pop a code.

There is a case that AVCS does not work but no code. It does not move even in the active testing in Techstream.

https://www.ft86club.com/forums/showthread.php?t=138803

Rako · 09-23-2022, 08:13 PM

Quote:

Originally Posted by makinen

There is a case that AVCS does not work but no code. It does not move even in the active testing in Techstream.

https://www.ft86club.com/forums/showthread.php?t=138803

Even if my logs show vvt enabled 1?

Rako · 09-23-2022, 08:28 PM

I just dropped my exhaust to check for restrictions just because I had a cat go bad once and thought debris might be stuck in the pipe but nothing there. Rode around with muffler disconnected and also nothing changed.

JohnH · 10-02-2022, 10:51 PM

I haven't read everything, so I hope its not a repeat.

I would put a different, mostly basic map. One that will work for your exhaust and intake for sure, but just a basic off the shelf map from the car.

Rako · 11-28-2022, 01:12 PM

UPDATE for anyone still interested

Flashed a stock 2017 ecutek map and I couldn't believe how much better the car ran. Even with the torque dip and all I have better acceleration and responsiveness and it's actually fun to drive again NOTE that I've ran 3 different tunes from 3 different reputable tuners (2 tuned it remotely and said everything looks fine) but all 3 have made my car run terrible before flashing the stock tune, which feels like an upgrade as crazy as it sounds. I'm positive the tunes aren't the problem and something else is f****** with me but what?

What gives?

I hope someone has a clue.

RToyo86 · 11-28-2022, 02:07 PM

Very odd. My car throttle feels significantly better tuned vs stock, along with overall powerband.

My tuner switched me over to a euro ROM when I tuned with ecutek. Cannot comment on the exact differences between USDM and EURO ROMs as I don't have the technical know-how. Dumbed down answer I was given is that it's less buggy.

Maybe somebody can shed more light on the difference. @tomm.brz ?

tomm.brz · 11-28-2022, 05:49 PM

Bugs are related to racerom patch applied to >17 US oem map, so an unpatched rom as his doesn t have problem

i think it s case is that he just doesn t like the tunes he got from those tuners, and maybe the were not objectively well done

oem tunes are very refined under 3000 rpm, and it s very much easy to mess up with smoothess and bogging down at low rpm if you don t spend time to improve it

10-02-2022, 10:51 PM	#25
JohnH Professional wrench Join Date: Jun 2020 Drives: 2020 BRZ ST RS Location: BC Canada Posts: 114 Thanks: 57 Thanked 37 Times in 28 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	I haven't read everything, so I hope its not a repeat. I would put a different, mostly basic map. One that will work for your exhaust and intake for sure, but just a basic off the shelf map from the car. __________________ 2020 BRZ Sport Tech RS World Rally Blue '18 TS Suspension, camber bolts, custom align Perrin intake pipe, custom airbox/cold air Gruppe-S UEL header/overpipe Wayne Rom Stg 2 tune

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09-18-2022, 09:17 PM	#15
Lantanafrs2 Senior Member Join Date: Jan 2018 Drives: 2013 frs red Location: South Florida Posts: 3,517 Thanks: 2,520 Thanked 3,088 Times in 1,654 Posts Mentioned: 6 Post(s) Tagged: 1 Thread(s)	Cams sticking?

09-19-2022, 10:17 PM	#19
Rako Member Join Date: May 2020 Drives: 2023 GR86 M/T Location: Chicago, Illinois Posts: 31 Thanks: 9 Thanked 9 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Yeah that's the thing, it looks normal for the most part..

09-23-2022, 08:28 PM	#24
Rako Member Join Date: May 2020 Drives: 2023 GR86 M/T Location: Chicago, Illinois Posts: 31 Thanks: 9 Thanked 9 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I just dropped my exhaust to check for restrictions just because I had a cat go bad once and thought debris might be stuck in the pipe but nothing there. Rode around with muffler disconnected and also nothing changed.

11-28-2022, 01:12 PM	#26
Rako Member Join Date: May 2020 Drives: 2023 GR86 M/T Location: Chicago, Illinois Posts: 31 Thanks: 9 Thanked 9 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	UPDATE for anyone still interested Flashed a stock 2017 ecutek map and I couldn't believe how much better the car ran. Even with the torque dip and all I have better acceleration and responsiveness and it's actually fun to drive again NOTE that I've ran 3 different tunes from 3 different reputable tuners (2 tuned it remotely and said everything looks fine) but all 3 have made my car run terrible before flashing the stock tune, which feels like an upgrade as crazy as it sounds. I'm positive the tunes aren't the problem and something else is f****** with me but what? What gives? I hope someone has a clue.

11-28-2022, 02:07 PM	#27
RToyo86 Senior Member Join Date: Mar 2018 Drives: 17 Asphalt 86 Location: Ottawa Posts: 2,167 Thanks: 1,708 Thanked 2,206 Times in 1,128 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	Very odd. My car throttle feels significantly better tuned vs stock, along with overall powerband. My tuner switched me over to a euro ROM when I tuned with ecutek. Cannot comment on the exact differences between USDM and EURO ROMs as I don't have the technical know-how. Dumbed down answer I was given is that it's less buggy. Maybe somebody can shed more light on the difference. @tomm.brz ?

11-28-2022, 05:49 PM	#28
tomm.brz Senior Member Join Date: Jan 2017 Drives: brz 2017 hksv2 Location: italy Posts: 2,196 Thanks: 500 Thanked 1,067 Times in 775 Posts Mentioned: 65 Post(s) Tagged: 0 Thread(s)	Bugs are related to racerom patch applied to >17 US oem map, so an unpatched rom as his doesn t have problem i think it s case is that he just doesn t like the tunes he got from those tuners, and maybe the were not objectively well done oem tunes are very refined under 3000 rpm, and it s very much easy to mess up with smoothess and bogging down at low rpm if you don t spend time to improve it

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