tooter's manifold adventure... - Toyota Yaris Forums

xnamerxx · 08-16-2012, 10:03 PM

I don't wanna hijack much but this was the explanation that was given to me by a TRD engineer.

When the heads are bolted onto the block the block would distort, and when the heads would be unbolted the block would remain distorted, and since its a race engine it was all built to a specific tolerance and it couldn't be machined or it would go out of spec.

You also have to remember these engines were build for IMSA racing so they only need to last for a 24hr race and then they would be replaced. Those motors could make an insane amount of power from a 2.3l reliably but for some reason they have turbo failure issues so you either get lucky or you have a motor that cooks after a short period of time.

In case you were wondering they make 900+hp at 31psi only problem is they sound terrible not a nice sounding engine.

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08-16-2012, 10:03 PM	#11
xnamerxx 0-60 in slow Drives: light blue liftback Join Date: Aug 2009 Location: so cal Posts: 926	I don't wanna hijack much but this was the explanation that was given to me by a TRD engineer. When the heads are bolted onto the block the block would distort, and when the heads would be unbolted the block would remain distorted, and since its a race engine it was all built to a specific tolerance and it couldn't be machined or it would go out of spec. You also have to remember these engines were build for IMSA racing so they only need to last for a 24hr race and then they would be replaced. Those motors could make an insane amount of power from a 2.3l reliably but for some reason they have turbo failure issues so you either get lucky or you have a motor that cooks after a short period of time. In case you were wondering they make 900+hp at 31psi only problem is they sound terrible not a nice sounding engine.