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Location:
NSW - Blue Mountains
Registered:
June 2004
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Question - VVT-i engines
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Thu, 01 December 2005 10:18
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Just a quick question about VVT-i in the BEAMS 3S, does it have limited mods that can be done while keeping it N/A form without stuffing up the VVT-i system?
From what I read on bill sherwoods site, this is what it sounded like anyway, might have misinterpreted it though, was kinda half asleep when I was reading it.
If this is true what mods can be done that wouldnt stuff the system up, im guessing better air filter, less restrictive exhaust, maybe port polish, higher comp pistons?
Just interested in finding out a bit more about these beams 3s.
cheers
chris
[Updated on: Thu, 01 December 2005 10:23]
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: Question - VVT-i engines
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Thu, 01 December 2005 11:21
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VVTi engines are amenable to the same benefits that all NA engines benefit from - improved intake, headwork, camshafts, compression, and exhaust.
It just so happens that some VVTi engines are already in a reasonably "high" state of tune so clowns with little understanding of the complexities of these engines are probably going to make things worse when they start toying with them. Combine that with the limited number of aftermarket ECUs that can adequately deal with continuously variable valve timing and most people put the whole thing in the too hard basket.
You just have to be a bit smarter about things - people have been screwing a lot more hp than standard out of the BEAMS 3SGE.
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Location:
NSW - Blue Mountains
Registered:
June 2004
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Re: Question - VVT-i engines
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Sat, 03 December 2005 01:47
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I thought camshaft work/mods would mainly be a disadvantage to the vvti system? I'm just trying to find out what can be done without having to find an aftermarket ecu that can be correctly tuned to the vvti system but also still add a bit of extra kw. It's just im wondering about the cams and other headwork mainly.
| gianttomato wrote on Thu, 01 December 2005 22:21 |
It just so happens that some VVTi engines are already in a reasonably "high" state of tune so clowns with little understanding of the complexities of these engines are probably going to make things worse when they start toying with them.
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Thats why im trying to find out about the beams before i decide on whether i should go for a genII or III or for a RWD (blacktop   )beams for a later conversion, so i dont turn out to be one of those clowns.
What would other peoples choice be....
Gen II
Gen III
Or Beams 3S-GE
It would be a street car, no over-the-top mods, kept N/A, might see 1/4 maybe even track once in a while, more of a fuel efficent but will still have decent power for when the foot gets a bit of lead in it .
cheers
chris
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Location:
Canberra
Registered:
July 2005
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Re: Question - VVT-i engines
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Sat, 03 December 2005 02:47
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As far as engine choices go, you'd be losing out, money wise, if you got a gen II/III up to BEAMS spec. Consider also that you would only be competing with the top end power of the BEAMS engine, since the VVT-i fills out the low-midrange.
Cams are one of the primary power upgrades for the BEAMS 3S-GE. If you are clever, you can retain VVT-i, thus having the same low range torque curve, but an improved top end. TRD makes some trick bits, but other than that, you'd have to consider custom parts. It seems the TRD extractors are the biz, so they would be a worthy investment.
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: Question - VVT-i engines
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Sat, 03 December 2005 03:15
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| CoronaC wrote on Sat, 03 December 2005 12:47 |
I thought camshaft work/mods would mainly be a disadvantage to the vvti system?
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Depends what you are trying to achieve. VVTi can help fill the "hole" that big cams leave in the bottom end - mind you, "bottom end" in a highly modified 4 cylinder might be 4000 rpm. The main issues are really with regard to valves clashing with the piston or each other depending on what is advanced or retarded and at what time (that depends a bit on valve angle etc).
My recommendation would be a BEAMS dual VVTi 3SGE if budget extends. With 200 hp, it should be plenty lively.
The head does benefit from porting (you'll understand if I don't divulge too much here). As for what size cams to use with the standard ECU, chat to some of the larger cam guys (Tighe, Wade, Kelford) and also check the profiles available from TRD.
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