Knocking on OFT V4.01 Stage 2+ E85 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Detroiter · 05-09-2018, 11:30 AM

Hi everyone, I am having issues with knocking on part throttle running the OFT Stage 2+ e85 V4.01 tune. Full throttle seems to have no issues but around half throttle in mid RPM I am having some decent knock that caused my IAM to drop. Last summer I was running the V2 E85 tune with no knocking at all. Would this knock be caused by changes to the tune to be more aggressive? Or would it more likely be the fuel? It doesn't seem to me like the ethanol content is that low due to the fuel trims being within the +-10% range.

https://datazap.me/u/detroiter/oft-s...e?log=0&data=1

Lincoln Logs · 05-09-2018, 12:18 PM

I have started to notice the same thing on v4.03 Stage 2+ E85 as well, I hadn't noticed at first since most of my logs were on the dyno right after flashing. I think some timing might need to be removed from the transient throttle table.

Wayno · 05-10-2018, 06:30 AM

Openflash provide you all the files required to open and compare both in romraider.

Yoshoobaroo · 05-11-2018, 02:44 PM

@Shiv@Openflash

Have you guys seen this on other cars?

Weigaldo · 05-29-2018, 10:06 AM

I had a mid-range issue with IAM dropping on 93 and am experiencing it still on E85. It does coincide with insane rasp between 3.5K-4.5K RPM. Would a harsh metallic resonance register with the sensors as knock potentially? If I shift below 3.5K or accelerate WOT through it, no issues. If I accelerate through 3.5K to 4.5K slowly, it see it affect my IAM.

Jasonb · 05-29-2018, 12:48 PM

I get occasional random knock as well with the v4.03 k00c stage 2+ tune as well using 93. Sometimes drops IAM, sometimes it's just a small amount of FLKC. It usually climbs back to 1 very quickly though. Not sure if false knock or too aggressive of a tune. I'm pretty sure I did have a case of false knock that I'm pretty sure I fixed cause even with higher octane it was still showing random knocks. But I still do get the occasional random knock.

Weigaldo · 07-20-2018, 04:57 PM

Just an update, I haven't had any more issues with IAM dropping under normal daily driving. What I have noticed after a few long trips is my car does not like highway speeds, specifically anything above 70 MPH. If I drive in 6th, it drops between .7-.8 IAM. If I keep it in 5th, it drops between .8-.9 IAM. If I slow down to 60-65 MPH, no issues in either gear really.

steve99 · 07-20-2018, 08:04 PM

Quote:

Originally Posted by Weigaldo

Just an update, I haven't had any more issues with IAM dropping under normal daily driving. What I have noticed after a few long trips is my car does not like highway speeds, specifically anything above 70 MPH. If I drive in 6th, it drops between .7-.8 IAM. If I keep it in 5th, it drops between .8-.9 IAM. If I slow down to 60-65 MPH, no issues in either gear really.

adjust the closed loop fueling to be a little richer in the load rpm range your getting knock

05-09-2018, 11:30 AM	#1
Detroiter Senior Member Join Date: Feb 2017 Drives: 2014 Scion FR-S Monogram Location: Michigan Posts: 215 Thanks: 149 Thanked 126 Times in 83 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Knocking on OFT V4.01 Stage 2+ E85 Hi everyone, I am having issues with knocking on part throttle running the OFT Stage 2+ e85 V4.01 tune. Full throttle seems to have no issues but around half throttle in mid RPM I am having some decent knock that caused my IAM to drop. Last summer I was running the V2 E85 tune with no knocking at all. Would this knock be caused by changes to the tune to be more aggressive? Or would it more likely be the fuel? It doesn't seem to me like the ethanol content is that low due to the fuel trims being within the +-10% range. https://datazap.me/u/detroiter/oft-s...e?log=0&data=1 __________________ 2014 Scion FR-S Monogram Raven OFT Stage 2 UEL E85 \| Tomei UEL Headers \| Catless FP \| Greddy Revolution RS Catback \| HKS Air Filter \| Toyota Badge Swap

05-09-2018, 12:18 PM	#2
Lincoln Logs Senior Member Join Date: Dec 2016 Drives: #337 2017 Toyota 86 Location: San Diego Posts: 225 Thanks: 32 Thanked 241 Times in 114 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I have started to notice the same thing on v4.03 Stage 2+ E85 as well, I hadn't noticed at first since most of my logs were on the dyno right after flashing. I think some timing might need to be removed from the transient throttle table. __________________ Sean Thomson \| Instagram: @the_drivers_perspective / YouTube: The Driver's Perspective Back To Basics Toyota 86: STX & 86 Cup Street Build

05-10-2018, 06:30 AM	#3
Wayno Senior Member Join Date: Apr 2014 Drives: Toyota 86 GTS Location: Australia Posts: 1,129 Thanks: 453 Thanked 895 Times in 424 Posts Mentioned: 211 Post(s) Tagged: 0 Thread(s)	Openflash provide you all the files required to open and compare both in romraider. __________________ rom downloads, information and examples Toyota 86 GTS OFT - Guide To Dialling In OTS Base Tune OFT - Example Alternate Maps for AT, 98RON, E85, MAF Scales

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05-29-2018, 10:06 AM	#5
Weigaldo Senior Member Join Date: Nov 2015 Drives: 2016 Steel AT FRS Location: Chicago Posts: 114 Thanks: 25 Thanked 26 Times in 20 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I had a mid-range issue with IAM dropping on 93 and am experiencing it still on E85. It does coincide with insane rasp between 3.5K-4.5K RPM. Would a harsh metallic resonance register with the sensors as knock potentially? If I shift below 3.5K or accelerate WOT through it, no issues. If I accelerate through 3.5K to 4.5K slowly, it see it affect my IAM.

05-29-2018, 12:48 PM	#6
Jasonb Senior Member Join Date: Jul 2017 Drives: 17 Series Yellow BRZ Location: Wilmington, NC Posts: 190 Thanks: 20 Thanked 47 Times in 40 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I get occasional random knock as well with the v4.03 k00c stage 2+ tune as well using 93. Sometimes drops IAM, sometimes it's just a small amount of FLKC. It usually climbs back to 1 very quickly though. Not sure if false knock or too aggressive of a tune. I'm pretty sure I did have a case of false knock that I'm pretty sure I fixed cause even with higher octane it was still showing random knocks. But I still do get the occasional random knock.

07-20-2018, 04:57 PM	#7
Weigaldo Senior Member Join Date: Nov 2015 Drives: 2016 Steel AT FRS Location: Chicago Posts: 114 Thanks: 25 Thanked 26 Times in 20 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Just an update, I haven't had any more issues with IAM dropping under normal daily driving. What I have noticed after a few long trips is my car does not like highway speeds, specifically anything above 70 MPH. If I drive in 6th, it drops between .7-.8 IAM. If I keep it in 5th, it drops between .8-.9 IAM. If I slow down to 60-65 MPH, no issues in either gear really.

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