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Location:
Newcastle, NSW
Registered:
May 2004
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duel vvti 3sge question?
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Fri, 23 September 2005 23:24
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hey i just found out the 3sge in the altezzas run a duel vvti system making like 210 hp at the crank...now my question is, as ive been thinking about it for a while now...would it be 1.possible, and 2.worth it, adopting the duel vvti system from that and trying to get it to work in a gen 1 3sgte?
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Location:
Brisbane, Queensland
Registered:
January 2004
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Re: duel vvti 3sge question?
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Sat, 24 September 2005 00:46
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It'd be easier to turbo the beams engine after dropping the compression.
It wouldn't be a very easy head swap. Although you can always pioneer it if you really want too.
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Location:
Canberra
Registered:
July 2005
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Re: duel vvti 3sge question?
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Sat, 24 September 2005 03:26
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I wouldn't touch it to be honest. The VVT-i probably is actuated from oil pressure, and to start with you'd need to sort this out (dunno where it taps to). Then u gotta consider that a BEAMS 3S-GE is entirely different: 12.5:1 pistons, different cam profiles are the major ones. With this in mind, you need to consider that the VVT-i maps would non longer be relevant if installed on a 3SGTE, 'cos the pistons are lower compression and the cams are milder. You could make it work, but consider how much R&D Toyota puts into these things, and compare it to your budget. Can u afford countless hours on the dyno, and constantly purchasing new custom cam grinds?
It would be more fruitful to turbo the BEAMS engine with, say, 6 psi boost. But then again, it wouldn' have the top end of a high boost 3SGTE.
That's how I see it. I could be wrong, however, but don't let anyone stop you from doing something different. 
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Location:
Brisbane
Registered:
May 2002
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Re: duel vvti 3sge question?
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Sat, 24 September 2005 05:44
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What they said. The easiest solution would be to turbocharge the BEAMS engine, although there's no reason you couldn't use custom pistons to get the compression ratio down to a more turbo-friendly number (I'd go for 9.0:1).
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Location:
Tasmania
Registered:
May 2002
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Re: duel vvti 3sge question?
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Sat, 24 September 2005 06:19
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The oil galleries for the VVTi system are in the head, plus the valve switches. Plus I think the head is shapped to allow the larger VVT cam pulleys. So no, you can not just put a VVTi system on a engine that didn't have it. You would need to swap over the whole head at the very least. Unless you are very keen to re-engineer the whole thing and your Dad owns a machine shop.
Remember that VVT systems do not magicaly give more power. It would be easy to build a motor with fixed cams and sprockets that has the exact peak power as any VVTi /Vtec engine you can name. The difference is that this fixed timing engine may not idle as well, and low end torque may be slightly less.
And in many cases, its not too hard to get MORE power out of a VVTi engine by giving it different cams, even if you have to disable all the VVT stuff. Its just a matter of having the cams avaliable, or getting them made, then retuning with a suitable computer.
So for a 3S-GTE, forget VVTi, and think more about the turbo.
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