the 3sgte head difference, 2nd. vs. 3rd. Options

[frosty]

Alrighty,

I'm looking to perform the 5s-gte motor build-up and I'm trying to decide which gen. gte head to go with. I know the 2nd gen had the tvis system and the 3rd didn't. I also read on some guys page months ago (and now I can't find it) that the 3rd was a better casting. To me that didn't matter if the head is getting ported and polished, but I believe he said the 3rd already had larger ports. (he had both heads side-by-side for visual aid) Mainly I noticed the difference in the 2nd and 3rd is that the 3rd came with a slightly better turbo and different compression ratios (probably a more aggressively tuned ecu?). I asume that this is really the main contributing factor to the 50ish hp increase.

I just want to know if there is any real advantage of one head over the other.

I see that alot of member on here swap using the 2nd gen motor and have great success with it. Esspecialy with the ct26 turbo. I pretty much want about 250 to 300 whp as a daily driver and see that it's done with the full 2nd gen. 3sgte.

If there is no real huge advantage of one head over the other then I would go with the 2ng gen. due to it's easier to find, parts are also easier to find, and the fact that it's cheaper than the 3rd.

[JesterDC]

Go learn: http://www.mr2oc.com/showthread.php?t=864
This has already been discussed by much smarter people than you and I.
Also Turbulence in the Runners will screw power, in the combustion chamber you are correct, but in runners you want straight fast air, so I DON'T have it backwards, YOU just quote out of context.

This post has been edited by JesterDC: Feb 18, 2007 - 1:12 PM

[alltracman78]

This has already been discussed by much smarter people than you and I.

Maybe smarter than you bud, not necessarily me.
I reread the thread [already read it once].
Twice the 5S block was mentioned to be stronger. No proof, no references. One also claimed the 5S was aluminum......
Nothing else I posted was refuted [other than the 2 strength posts]. In fact, pretty much everything I mentioned was also mentioned there.
See my first sentence.....

I also saw a whole lot of questions, a few answers, and what has to be used to make it work.

So I'm not totally sure what your point was?

Also Turbulence in the Runners will screw power, in the combustion chamber you are correct, but in runners you want straight fast air, so I DON'T have it backwards, YOU just quote out of context.

You need to go back and read what you posted...

And to the 5SGTE guy, almost all flow benches will report better flow for bigger ports, but if the ports are to big for the engine to fill with air then you'll have turbulence->loss of torque->loss of hp, just fyi

Let's see
1-This thread is about HEADS [read the title in case you already didn't].
2-"Ports" are referenced to HEAD ports. If you're talking about intake manifolds, RUNNERS are referenced.
3-NORMALLY a flow measurement is referenced to a head. You mentioned nothing about manifolds.
4-The 2nd/3rd gen3sgte HEAD ports are what was specifically mentioned. While I did mention a intake manifold comparison, I don't know [and I clearly stated this] which flows more, or which has larger runners.