Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - Ignition drop at ~4500 RPM in 6 gear (JDL header + OFT Stage 2)

Zamor86 · 07-27-2023, 03:22 PM

Hey Everyone! (some of you might have seen this already on the OFT FB Group)

My car: 2013 Toyota GT86, manual, K&N drop-in, Mishimoto intake tube (with factory airbox), JDL catted UEL header, HKS Spec-L catback, OFT Stage 2 Tune (Stg-2-v4.03-LC-FSS-Z), running on premium fuel only (it’s “98 octane” here in Europe)

Issue: Experiencing temporarily reduced power at around 4500 RPM in 6 gear after installing the JDL header. No CEL, no codes, no other issues.

I did some data logging with my OFT tablet. Two pulls in 6 gear, one in 5 gear, and a 2000 RPM to redline in 3 gear:

[6 gear - pull 1]:
https://datazap.me/u/raven86/6-gear-...10-11-12-13-14

[6 gear - pull 2]:
https://datazap.me/u/raven86/6-gear-...10-11-12-13-14

[5 gear]:
https://datazap.me/u/raven86/5-gear-...10-11-12-13-14

[3 gear - 2K to redline]:
https://datazap.me/u/raven86/3-gear-...10-11-12-13-14

As you can see, the problem seems to appear only in 6 gear and it seems like what I'm feeling is a one second drop in Ignition Adv. (27 to 18).

The Advance Multiplier stays at 1 and FLKC is 0... I did two runs full throttle on 6th gear and the first time it happened at around 4400 RPM, the second time it was around 4200 RPM. Didn't happen at all with the 5th gear.

I experience no other issues when daily driving or tracking. When accelerating hard from standstill (or in lower gears in general), the car pulls beautifully and smoothly to the redline in every gear.

When I first noticed this:

- stock header = no issue
- stock header + Stage 1 OFT tune = no issue
- JDL catted UEL + still on Stage 1 OFT tune (briefly, right after installing the header) = started happening
- JDL catted UEL + Stage 2 OFT tune = still happening

So it seems like something happened after I installed the header.

Any ideas what it could be? Any additional parameters I should log maybe? Would also appreciate your opinion on the general behaviour of the engine with this setup. Anything I should be concerned about apart from that weird Ignition drop?

Thank you guys!

07-27-2023, 03:22 PM	#1
Zamor86 Junior Member Join Date: May 2021 Drives: 2013 Toyota GT 86 M/T Location: Poland Posts: 5 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Ignition drop at ~4500 RPM in 6 gear (JDL header + OFT Stage 2) Hey Everyone! (some of you might have seen this already on the OFT FB Group) My car: 2013 Toyota GT86, manual, K&N drop-in, Mishimoto intake tube (with factory airbox), JDL catted UEL header, HKS Spec-L catback, OFT Stage 2 Tune (Stg-2-v4.03-LC-FSS-Z), running on premium fuel only (it’s “98 octane” here in Europe) Issue: Experiencing temporarily reduced power at around 4500 RPM in 6 gear after installing the JDL header. No CEL, no codes, no other issues. I did some data logging with my OFT tablet. Two pulls in 6 gear, one in 5 gear, and a 2000 RPM to redline in 3 gear: [6 gear - pull 1]: https://datazap.me/u/raven86/6-gear-...10-11-12-13-14 [6 gear - pull 2]: https://datazap.me/u/raven86/6-gear-...10-11-12-13-14 [5 gear]: https://datazap.me/u/raven86/5-gear-...10-11-12-13-14 [3 gear - 2K to redline]: https://datazap.me/u/raven86/3-gear-...10-11-12-13-14 As you can see, the problem seems to appear only in 6 gear and it seems like what I'm feeling is a one second drop in Ignition Adv. (27 to 18). The Advance Multiplier stays at 1 and FLKC is 0... I did two runs full throttle on 6th gear and the first time it happened at around 4400 RPM, the second time it was around 4200 RPM. Didn't happen at all with the 5th gear. I experience no other issues when daily driving or tracking. When accelerating hard from standstill (or in lower gears in general), the car pulls beautifully and smoothly to the redline in every gear. When I first noticed this: - stock header = no issue - stock header + Stage 1 OFT tune = no issue - JDL catted UEL + still on Stage 1 OFT tune (briefly, right after installing the header) = started happening - JDL catted UEL + Stage 2 OFT tune = still happening So it seems like something happened after I installed the header. Any ideas what it could be? Any additional parameters I should log maybe? Would also appreciate your opinion on the general behaviour of the engine with this setup. Anything I should be concerned about apart from that weird Ignition drop? Thank you guys! Attached Images Last edited by Zamor86; 07-27-2023 at 04:54 PM.