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


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Old 07-20-2013, 05:55 PM   #1
elefunkd
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stock BR-Z, much detonation during shifts: tune?

I only have 2000km on my completely stock BR-Z. Since new, I noticed a brief moment of detonation while completing a gear-change.
This happens as the clutch is engaged and throttle re-applied, just as the engine is loaded again.
It happens when making quick gear-changes and semi-aggressive driving, while shifting just after the first torque peak, around 4k/rpm.

Do any/all of the available tunes address this issue? It is driving me nuts.
I now religously use sunoco 94 fuel which has not helped this issue.

Thanks!

-Thomas
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Old 07-20-2013, 06:53 PM   #2
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You, good sir, need to get into the dealer ASAP and get your direct injectors checked. Keep out of hight RPM and avoid shifting quickly. Don't mean to scare you, but it could be somewhat serious. You catch it before serious damage is done, you will be golden
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Old 07-20-2013, 08:01 PM   #3
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Woah... sounds serious. I will make an appointment asap.
Has anyone else experienced something to that effect?
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Old 07-20-2013, 08:32 PM   #4
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Quote:
Originally Posted by elefunkd View Post
Woah... sounds serious. I will make an appointment asap.
Has anyone else experienced something to that effect?
Search DI Failure and you will find plenty threads regarding this emergin issue :happy0180:
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Old 07-20-2013, 08:36 PM   #5
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Quote:
Originally Posted by elefunkd View Post
Woah... sounds serious. I will make an appointment asap.
Has anyone else experienced something to that effect?
Welcome to the forums! Crappy way to come in, but thankfully, you will find a lot of useful information
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Old 07-20-2013, 10:46 PM   #6
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OP-

Not saying it's this issue, but it's worth informing yourself about what your symptoms could be:

http://www.ft86club.com/forums/showthread.php?t=36129
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Old 07-21-2013, 03:01 AM   #7
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Quote:
Originally Posted by elefunkd View Post
I only have 2000km on my completely stock BR-Z. Since new, I noticed a brief moment of detonation while completing a gear-change.
This happens as the clutch is engaged and throttle re-applied, just as the engine is loaded again.
It happens when making quick gear-changes and semi-aggressive driving, while shifting just after the first torque peak, around 4k/rpm.

Do any/all of the available tunes address this issue? It is driving me nuts.
I now religously use sunoco 94 fuel which has not helped this issue.

Thanks!

-Thomas
They all do it. The 'di failure' paranoia threads is dealt with by an updated calibration, however that won't resolve the 4k RPM tip-in det you're talking about. Most of the doom mongers won't know the difference though and will mislead you.

I wouldn't worry about it. Try not slipping the clutch during shifts.
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Old 07-21-2013, 04:31 AM   #8
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Quote:
Originally Posted by ft_sjo View Post
They all do it. The 'di failure' paranoia threads is dealt with by an updated calibration, however that won't resolve the 4k RPM tip-in det you're talking about. Most of the doom mongers won't know the difference though and will mislead you.

I wouldn't worry about it. Try not slipping the clutch during shifts.
Weird. My car doesn't detonate at high RPM's and shifting fast. I am hardly a "doom monger" as I don't drive the car enough in the manner needed to cause any sort of DI failure, so it is not a concern for me. But if the OP is truly getting detonation, that is NOT normal on any car.
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Old 07-21-2013, 08:08 AM   #9
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Detonation is not a normal condition in any engine. Ever. Unless its a diesel.
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Old 07-21-2013, 10:33 AM   #10
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How do you know it was knocking? Are you sure you're not just hearing driveline noise? Do you have ECUtek logs showing the knock?

Quote:
Originally Posted by jamesm View Post
Detonation is not a normal condition in any engine. Ever. Unless its a diesel.
I wouldn't say it's "desireable" condition, but it's certainly a normal one. Just about every modern engine runs on the edge of knock under certain conditions because that gives the best fuel economy. And knock isn't an all-or-nothing thing. There are degrees of severity.
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Old 07-21-2013, 11:39 AM   #11
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I am 100% certain it is detonation, and under the aforementioned conditions, it is quite pronounced and unmistakable.

As I would like to flash the ecu soon, my dilemma is such: should I take it to the dealer before flashing the ecu? Or try a flash that has a modified Transient Ignition Retard Table, IF there is such a flash available.

And aside from detonation at the aforementioned conditions, I haven't heard it happening any other time.
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Old 07-21-2013, 12:12 PM   #12
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So to clarify: when driving the car very aggressively (up-shiftin @ or near rev limit, there is no audible detonation.
Only when accelerating moderately and shifting quickly just past the first torque peak.

Not exactly certain at what rpm, but I will make a mental note to check next time I drive,
but certainly nowhere near rev limit, nor at WOT.

If there is a tune that addresses this issue, I will skip the dealer visit and deal with it by flashing the ecu with said tune, as this is something I would like to do in the near future.

Thanks for the responses!

-t
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Old 07-21-2013, 12:18 PM   #13
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let the dealer check first..

it seems like its a DI issue and trust me you can blow your engine...

go to the dealer and tell them about it and ask them about the update ECU calibration
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Old 07-21-2013, 12:18 PM   #14
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a tune will prevent this issue for cars that never had an issue before, but if you already have the issue, it wont help as ur DI might be damage already
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