Blown Engine

[kombatlion]

We have the aem fail safe logs, will that work?

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[Dephective]

It's better than nothing lol. Not sure what all that logs, but AFR would definitely be a good thing to look at during the boom.

[Luckrider]

Originally Posted by woode

Weird, I would have thought the stock fueling would have ran out well before you were able to squeeze 350+ WHP out of it. I guess the meth helps out a lot.

If it isn't the meth, I have heard you can overrun the DI to get more fuel. I wonder if the wideband scaling was off making it look like it runs this rich. That could have caused the system to show rich while really running dangerously lean leading to detonation and ultimately a motor that is no longer happy. This is all 100% speculation of course.

[xwd]

People have broken rods with good tunes at less than 350WHP. In the end if you want that kind of power you have to pay to play and part of that is likely building a bottom end. Just like most of the WRX/STi guys build blocks because of stock piston failures, the norm at some point will be for FA20 owners to replace the rods.

[King Tut]

Originally Posted by kombatlion

We have the aem fail safe logs, will that work?

Post them up. Any chance you had the RPM hooked up as well?

[ramiram1984]

Repairable by a machine shop

[nelsmar]

If te closed loop timers were not adjusted properly then the turbo could have spooled up and the engine could have leaned out while the timers were still ticking. Also how was the meth controlled? There is a lot involved in tuning these cars. And a lot that can go wrong! Who was the tuner? I would talk to the tuner for insight. Keep in mind motors do break. Not all motors are the same.

[kombatlion]

I will get the data and post it up, also I will reques a data log from my tunner just to be safe! Thanks guys!

[DBW]

I don't think its rods that let go first. I feel the pistons are failing where the wrist pin attaches. Once this fails the rod is free to move about which why we are seeing so much damage on the tops of the blocks when this happens. I have seen many rod failures and most of the time the damage to the block is minimal.

[fast_dude]

If these motors don't blow over time, won't they wear out quicker under the excessive load barrier that has been created by the tune?

[FR-S Matt]

Originally Posted by fast_dude

If these motors don't blow over time, won't they wear out quicker under the excessive load barrier that has been created by the tune?

There's people boosted on over 30-40k miles. I think it's more along the lines of:

A) Make sure your tune is really good, and running in safe ranges.
B) Maintain your car and FI system well.
C) Check fluids, check fluids, check fluids.

[Ryan P]

Originally Posted by fast_dude

If these motors don't blow over time, won't they wear out quicker under the excessive load barrier that has been created by the tune?

Yes, the minute you stray from the factory engineered product you are shortening the life of the motor. There is no such thing as free lunch.

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[andrew20195]

Originally Posted by Dephective

The only difference between our block and the FA20DIT factory turbo motor from subaru is different pistons. They opted for a lower CR to be safe.

The rods are different as well.

[Scalzo]

Originally Posted by Dephective

No, this motor does not have forged rods. Yes, this motor was built for high-er stroke speeds. You happen to be missing a few keys points as to other variables that engine internals see outside of just the torque produced by the combustion process, as well was the overwhelming empirical evidence of literally thousands that are boosted on stock internals.

Applying conventional thinking, yes this motor doesn't like boost. Understanding the many benefits of DI, you will start to see why we can make power reliably with boost. The cooling effect on in-cylinder temperatures that DI provides keeps both the piston head cool, and helps prevent detonation. This is especially important at the 12.5:1 CR that we have. Another thing people would say is a disaster for boost. Quite the opposite. Having that high CR allows us to spool much larger turbines with our measly 2.0L, and make some decent torque with much lower PSI. There are many more variables to factor in. The only difference between our block and the FA20DIT factory turbo motor from subaru is different pistons. They opted for a lower CR to be safe.

As for the OP, I very rarely blame a kit for engine failure unless the install was suspect. The real question is, why are you running stock fueling at 350whp? Tuning, especially with adding in the Meth variable, would be my first guess for the root cause of failure. Sure rods just give out sometimes. But tuning is absolutely key to boost reliability. Without having logs, there's no way to know though.

couldn't agree more.
I was at 298whp and the stock fueling wasn't enough/ fuel pump either.
had to upgrade those. but damn meth injection too?