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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 08-22-2022, 03:18 AM   #15
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Originally Posted by Hydropkd View Post
Oh, yea it's 4k in every gear and if you don't change gears it will die and the tach gets stuck on 4k

Ok definitly sounds like limp mode, however that mode is usually trigfered by a fault in one or more of the cars systems and that generally trigfers some error codes in ECU and some dash lights like trac/vsc steering or CEL


if you got none of those lights im guessing is due to a tuje feature like launch or flat foot shift triggering or the tune itself has a rev limit mode that active, hence no associated cel lights
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Old 08-22-2022, 11:09 AM   #16
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Oh, yea it's 4k in every gear and if you don't change gears it will die and the tach gets stuck on 4k
My tuner, unbeknownst to me, enabled flat foot shifting. When driving, engine would not rev. Sometimes 4500, sometimes 5500. Data logs showed the ign timing would drop to 0* It was fine at lower rpms and it worked perfectly when the tuner drove it.


@AussieBRZ may be on the right track. Another Aussie genius, @steve99, suggested fft was enabled. The next time I drove the car, I noticed that I would unconsciously, very lightly, rest my foot on the clutch before shifting. When I kept my foot off the pedal, it revved to 7300. The tuner disabled fft and my car and I are living happily ever after.


The disable switch is very sensitive. It will turn off the cruise control with even the slightest pressure on the clutch.



Check that you are not touching the clutch. If that's ruled out check the clutch pedal switch.
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Old 08-22-2022, 10:05 PM   #17
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No change in tach when pulling back the cruise switch
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Old 08-23-2022, 11:37 AM   #18
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That is pretty odd, everything on a pre-facelift car should interchange. Does it run fine otherwise?

Without being able to see the live data, I don't think we are going to be able to help. You need a shop with a way to look at the live data via something like techstream.
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Old 08-23-2022, 06:58 PM   #19
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Runs fine otherwise, seeing what I can do about a data log, will post it when I get it
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Old 08-23-2022, 06:59 PM   #20
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Would a bad o2 sensor do what I have without a code?
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Old 08-23-2022, 07:44 PM   #21
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Quote:
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Would a bad o2 sensor do what I have without a code?

Not likely.
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Old 08-23-2022, 08:04 PM   #22
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Did you change the crank reluctor wheel?
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Old 08-23-2022, 08:34 PM   #23
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Did you change the crank reluctor wheel?
It's the same on pre facelift cars. Didn't change until 17'+. The early cars can't read the facelift reluctor and vise vera.
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Old 08-23-2022, 11:36 PM   #24
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It's the same on pre facelift cars. Didn't change until 17'+. The early cars can't read the facelift reluctor and vise vera.
Oh right - thanks for clarifying
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Old 09-06-2022, 10:52 PM   #25
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Changed fuel injectors and spark plugs, and o2 sensor. Here is a log.
Attached Images
File Type: pdf FR-S Log 8-31-22.pdf (89.3 KB, 24 views)
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Old 09-07-2022, 10:14 AM   #26
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Changed fuel injectors and spark plugs, and o2 sensor. Here is a log.
You might want to switch your log to Datazap.me.

Last edited by blsfrs; 09-07-2022 at 01:26 PM.
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