Sunday, November 28, 2010

2JZ-GE and 2JZ-GTE Differences

In my ealier post, I had put the photo of the Toyota 2JZ-GTE head set gasket photo for viewing purpose, the photo is the same item on this post, but in this post I will try to put some the fact of differences between the 2JZ-GE and 2JZ-GTE engine.

First, I wish to pick up a comment by one of the Supra Forum which it difference the 2 type engine performances as below,

They have different compression ratios. The 2JZ-GE is about 9.6:1 as compared to the 2JZ-GTE at 8.5:1. The 2JZ-GE can run a turbo, but you won't be able to run as much boost because of the higher CR pistons. Your effictive CR will climb faster. With about 9psi boost an 8.5:1 engine will have an effective CR of about 13.7:1 and a 9.6:1 motor will have an effective CR of about 15.5:1. In terms of how the engine will respond the higher compression NA motor will not like more boost. The NA motor will however make better low end TQ. Which in the real world of daily drivers is preferable to a laggy boosted to hell dyno queen.

My general recomendation on which motor to go with is this:

If you are doing a mild build then go with the 2JZ-GTE. It will cost less than rebuilding the 2JZ-GE for boost.

If you are doing a major build in which you have to replace the internals to handle more power then finding a rebuildable 2JZ core is the way to go. If you can't find one then get a 2JZ-GE, strip it, and build it up.

And at my side, let see what is the differences on the engine gasket.

First the 2JZ-GE cylinder head gasket thickness is about 0.4mm while the thickness of cylinder head gasket for 2JZ-GTE is 1.35mm, another differences is their design of exhaust manifold and intake manifold are difference, so the gasket will be difference as well.

2JZ-GE is mainly for model like Supra, Aristo and Crown like JZA80 and JZS13# while 2JZ-GTE is mainly for Lexus GS300 Turbo on JZS

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