Anyone blown a stock boosted motor yet?

[evo4g63]

Originally Posted by GotBRZ1691

That's the numbers as they are now. Sure te percentage is a lot less. I'm not in the financial situation where I could even face a risk of 5% of blown motor. I could pay to set it up right but can't pay to replace a block.

And I'm sure there are people who have done the set up correctly and had a time and support mods and still lost their motor.
I will play when I have the money to pay. Until them playing it safe.

You sir deserve a cookie. Unlike most you tend to understand that blowing a motor can happen taking the FI plunge.

[BRZPDX]

Its like raw dogging girls. a lot of bads can happen, but most of us come out ok.

[AZFA20]

Not to scare people but the cam timing (VVT) failures are a real issue in the FA20 and they are hit and miss. I consider it essentially a silent killer. It happens at random and often without the driver ever knowing its occurring. If you're acute to the issue you can hear it happen in the exhaust note. Most commonly I have found it to be the exhaust cams. The ECU literally looses control of the cams and they can and do float throughout their range out of sync from one another. By the time the CEL is set it has already been doing it for a while. In every instance I have personally worked with, the OCVs have been at fault. Worst part is they all test electrically good so the only way to know is to either know what to listen for ALL the time OR logging the cams always OR toss the cam codes which sadly if that happens it has been already doing it for a while haha. They always have slight deviations but what I am talking about becomes massive deviations haha. To make matters worse Both Toyota and Subaru know about it and there has been zero revisions of any of the suspected components responsible for this sometimes catastrophic issue.

Here is one of them I have logged doing it with NO CEL triggered (eventually it did). Exhaust cam #1 is the floater although exhaust cam #2 was havimg issues as well.

THIS ONE = BAD


Here is what they should be doing. This is AFTER me making repairs to an FA20 exhibiting the example I logged above.

THIS ONE = GOOD

[King Tut]

Originally Posted by evo4g63

@King Tut "Boom" add me to the list

Shoot me a PM with the details.

[King Tut]

Originally Posted by AZFA20

Not to scare people but the cam timing (VVT) failures are a real issue in the FA20 and they are hit and miss. I consider it essentially a silent killer. It happens at random and often without the driver ever knowing its occurring. If you're acute to the issue you can hear it happen in the exhaust note. Most commonly I have found it to be the exhaust cams. The ECU literally looses control of the cams and they can and do float throughout their range out of sync from one another. By the time the CEL is set it has already been doing it for a while. In every instance I have personally worked with, the OCVs have been at fault. Worst part is they all test electrically good so the only way to know is to either know what to listen for ALL the time OR logging the cams always OR toss the cam codes which sadly if that happens it has been already doing it for a while haha. They always have slight deviations but what I am talking about becomes massive deviations haha. To make matters worse Both Toyota and Subaru know about it and there has been zero revisions of any of the suspected components responsible for this sometimes catastrophic issue.

There is no doubt that this is an issue. I sometimes worry if changes to the VVT maps in EcuTek or going to extremes with the cams are contributing to the failures.

[BRZPDX]

So what exactly does the exhaust sound like if the VVT is failing? lately, I've noticed my car sounds more UELish although my header is a EL design. we used BRZedit, so I don't think we messed with the VVT.

[evo4g63]

Originally Posted by King Tut

Shoot me a PM with the details.

I saw your pm. I'll get back to you on that shortly.

[AZFA20]

Originally Posted by BRZPDX

So what exactly does the exhaust sound like if the VVT is failing? lately, I've noticed my car sounds more UELish although my header is a EL design. we used BRZedit, so I don't think we messed with the VVT.

That is essentially exactly what it sounds like when the VVT is out of sync. The further separation from being in sync the more it will sound like a UEL. Not to say this is what is happening in your case but if it were me I would log your cams asap.

They become most noticeable when idling but it can be heard just cruising along. Under full load and acceleration it's harder to audibly hear, especially because it can sometimes come and then go very quickly. This can happen both intermittently or constantly.

Originally Posted by King Tut

There is no doubt that this is an issue. I sometimes worry if changes to the VVT maps in EcuTek or going to extremes with the cams are contributing to the failures.

I have to admit this has crossed my mind too but it happens in totally stock cars too so its pretty inconclusive.

[Frs300]

Originally Posted by AZFA20

That is essentially exactly what it sounds like when the VVT is out of sync. The further separation from being in sync the more it will sound like a UEL. Not to say this is what is happening in your case but if it were me I would log your cams asap.

They become most noticeable when idling but it can be heard just cruising along. Under full load and acceleration it's harder to audibly hear, especially because it can sometimes come and then go very quickly. This can happen both intermittently or constantly.



I have to admit this has crossed my mind too but it happens in totally stock cars too so its pretty inconclusive.

what exactly is the cause

[AZFA20]

Guys I am getting blasted with PMs on this subject as I assumed I would but instead of responding to everyone's PMs do you feel this subject should be made as a new thread in the main "Forced Induction" forum? That way I can address everyone's questions as best as I can so that everyone can see the info. I know not everyone checks this particular thread so it may be more beneficial to create a new one. Let me know what you think.........

[King Tut]

Originally Posted by AZFA20

Guys I am getting blasted with PMs on this subject as I assumed I would but instead of responding to everyone's PMs do you feel this subject should be made as a new thread in the main "Forced Induction" forum? That way I can address everyone's questions as best as I can so that everyone can see the info. I know not everyone checks this particular thread so it may be more beneficial to create a new one. Let me know what you think.........

I would create one, while it may contribute to blown stock motors, it needs it's one thread.

[BRZPDX]

Originally Posted by AZFA20

That is essentially exactly what it sounds like when the VVT is out of sync. The further separation from being in sync the more it will sound like a UEL. Not to say this is what is happening in your case but if it were me I would log your cams asap.

They become most noticeable when idling but it can be heard just cruising along. Under full load and acceleration it's harder to audibly hear, especially because it can sometimes come and then go very quickly. This can happen both intermittently or constantly.



I have to admit this has crossed my mind too but it happens in totally stock cars too so its pretty inconclusive.

Thanks for the reply, this is concerning. The UEL like sound is only when accelerating from a stop on very low rpm. Cruising, and after the initial acceleration from stop, it sounds like a normal EL.

I am going back to my shop to plot some shit. My correction on the AFR while idling, it seems to vary depending on if I have my AC/Fan blowing but it is around 14 and 16. It actually varies a lot. This car does funky things when the heat/cool fans are on. When I turn off the fans, it idles smooth as butter.

If the VVT is going out, is that something you can fix with a tune? Or does replacing it fix the issue? It seems like the issue will come back if only replacing the VVT from OEM..

Fucking boost issues.

[SmsAlSuwaidi]

No holes in my block but my heads are most likely toasted or something.

[Dipstik-sportech]

Headgaskets