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


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Old 06-12-2013, 03:57 AM   #239
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What you mean by you can hear it detonate?
Detonation usually makes a pinging sound (sort of like a small ringing bell) which you can hear when you step on the throttle (not lift the throttle).
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Old 06-12-2013, 07:30 AM   #240
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What you mean by you can hear it detonate?
Detonation usually makes a pinging sound (sort of like a small ringing bell) which you can hear when you step on the throttle (not lift the throttle).
You are confusing Pre-Ignition with Detonation. Pre-Ignition (a/k/a Knocking) occurs when there are hot spots in the combustion chamber from either carbon deposits or too hot a sparkplug range. It is annoying but largely non-distructive. It's sounds like pinging.

Detonation is erratic combustion that occurs in the compression stroke. It is destructive. A "mild" case will cause head gasket or sparkplug failure. A severe case will bend connecting rods or destroy pistons. It too sounds like pinging, but it also feels like the power has been cut in half...like someone has tied a 2,000 pound weight to the bumper.
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Old 06-12-2013, 07:41 AM   #241
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I don't think this is directly related to shifting. I've seen this problem first hand on a friends BRZ, and he has never shifted aggressively. Never tracked the car, either. He has a stick, though.
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it is related to shifting. After I put my headers on, I can hear the car detonate when I lift throttle over 6k rpm or so. Couldn't hear it before.
Not necessarily. Your case, perhaps. But not always.
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Old 06-12-2013, 09:31 AM   #242
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>:[ no more power mods til this crap is figured out.
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Old 06-12-2013, 09:47 AM   #243
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It is figured out. What's wrong with you people? Desperate for something to chat shit about?
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Old 06-12-2013, 09:49 AM   #244
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It is figured out. What's wrong with you people? Desperate for something to chat shit about?
Im not sure if u are being sarcastic or serious
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Old 06-12-2013, 10:42 AM   #245
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It is figured out. What's wrong with you people? Desperate for something to chat shit about?
What's your deal, dipstick?

Let me amend my statement: no more power mods until SUBARU acknowledges there is a problem and INSTATES a fix for vehicles that have been out in the wild that do not have a fix from the factory.

Thank, please GFY.
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Old 06-12-2013, 10:49 AM   #246
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@OrbitalEllipses Please explain to us all what relevance engine power has to do with a transient det problem?
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Old 06-12-2013, 11:55 AM   #247
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If I remember correctly, someone also mentioned bad fuel as his cause for seal failure (which usually would be taken care of by a knock sensor and should not cause any parts to melt away).
Anyway, I guess one question would be if there was a single case of seal failure after they installed this ROM revision?
http://www.ft86club.com/forums/showthread.php?t=37411
However, since most people have this ROM revision not installed, the probability of finding one with a seal failure would be very slim, even if there was still a chance of dealing with detonation after installing this ROM revision (since so far much less than 1% of all cars seem to be affected by this problem).

Btw, how would one get to this ROM revision anyway? Does one need to go to a dealer and specifically ask for it? Do they even know about this problem on a global level?

PS: Increasing power requires an increase of pressure in the combustion chamber and since p*V = n*R*T, going FI does at least increase the risk of detonation.
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Old 06-12-2013, 11:55 AM   #248
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@OrbitalEllipses Please explain to us all what relevance engine power has to do with a transient det problem?
While this most likely has nothing to do with power mods, I tend to agree with @OrbitalEllipses . It is a major pain, having to fight Toyota (in my case) because I have exhaust, or intake, or tune. The first thing they want to do, is blame the mods.

Having to remove these mods before taking it to a dealer, becomes painful too. I am looking to go FI, but am holding off as well. Not because I think these mods will accelerate the issue. I just don't want to deal with warranty work being denied because they don't know what's going on. I personally would rather Toyota/Subaru get things fixed/corrected, before I continue with my power mods.

EDIT: And just to be clear, I have had this issue. The dealer blamed my intake tube, and denied warranty. I had to fight them, and they eventually got the okay from Toyota to rip into it further. They quickly found 2 bad injectors/collars which were replaced under warranty. Had I known it would be such a fight with them over the intake, I would have removed the stupid thing before taking it in.
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Old 06-12-2013, 12:10 PM   #249
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@OrbitalEllipses Please explain to us all what relevance engine power has to do with a transient det problem?
Exactly what @TemeCal said...warranty consideration. TSB don't mean squat to an unfriendly dealership. Given the chance to deny warranty claims, they will deny the claim as it's their favorite thing to do.
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Old 06-12-2013, 12:45 PM   #250
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I don't believe "it is figured out" can honestly be said yet. A culprit has been identified, yes, but the failing part in question I don't believe is a particularly good design. Seal failure for a variety of reasons is entirely possible.
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Old 06-12-2013, 12:51 PM   #251
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My check engine light has come up a few times, and from time to time I can smell gas fumes from the engine compartment.

So I called my dealer, theres no TSB on there system for this. But the SM told me to bring it in Monday to have it checked and get it fixed right away so I guess well see what happens/
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Old 06-12-2013, 12:57 PM   #252
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in for a good read later.
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