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Location:
Rocklea qld
Registered:
February 2003
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vr commodore/lexon. boosted engine?
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Thu, 03 November 2005 12:12
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just wondering if anyone knows how much boost the 3.8litre lexon/commy engines will handle safely. 5-6psi? and if the computer will handle that much?
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: vr commodore/lexon. boosted engine?
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Thu, 03 November 2005 12:14
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i hate to be a killjoy, but the lexcen motor is the normal commonwhore motor.
maybe ask on some of the commodore/holden forums?
you could also look the the US forums abotu the different versions (includign the bodgy supercharged one) and see what different parts they had in them?
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Location:
Montrose, VIC
Registered:
May 2002
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Re: vr commodore/lexon. boosted engine?
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Thu, 03 November 2005 12:55
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Guess I'll attempt to give you an answer before the bulk flaming starts 
Like any engine, you can give them a SMALL amount of boost, and the ECU for all versions is quite flexible for remapping (therefore, there's no excuse NOT to remap it properly!)
Check out the US forums and look for the old-school factory turbo verson, and check out some of the claims the yanks make about the potential of these engines...
Of course, I use the word 'engine' with the broadest possible definition...
I'll say no more 
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Registered:
July 2005
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Re: vr commodore/lexon. boosted engine?
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Thu, 03 November 2005 16:33
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i belive the SC14 goes on every bloody supercharged 3800 commowhore i see around here (im in adealide, 2 friends have superhcarged commodres, ones a vn the others a vt). a crap load of shops will have all the parts available (mounting hardware and pipes and belts) to do this.
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Location:
Campbelltown
Registered:
November 2003
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I supported Toymods
Location:
melbourne.victoria.austra...
Registered:
June 2002
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Re: vr commodore/lexon. boosted engine?
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Thu, 03 November 2005 21:56
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depending on the sort of life any vn/lexcen has had the 3.8 will handle 7psi with no issues - i've seen guys do this and make good numbers out of the things too (for a pushrod cast iron motor that is)
um, its like most things - push it and it will break. cam bearings walk in the EV6 onwards and can be a pain to fix (rebuild) but otherwise they're pretty strong.
plenty of different ppl are making turbo manifolds for them now - have a look on street commodores - they make mention of them.
CRS do make the supercharger kit which from memory is 1500 or so minus the charger and is lucky to push 2-3psi.
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Location:
Adelaide
Registered:
June 2003
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Re: vr commodore/lexon. boosted engine?
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Thu, 03 November 2005 22:27
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i think up to the vn you can swap in the vl cross member and the bolt up the rb series motor. not 100% sure of this though. i know it doesn't help your question but it dose make for a different conversion.
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Location:
Brisbane
Registered:
July 2005
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Re: vr commodore/lexon. boosted engine?
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Fri, 04 November 2005 03:00
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Dont use a series 1 VN Buik (how do u spell that) version. Has major problem with cam bearing setup, not sure on technicalities but something fucks up, no oil to bearing, bottom end bang. Tis common.
Series two has a restrictor in the inlet to the valley plenum coz too many grandpas complained about torque in the series 1. This will be mildly detrimental flow in any boosted application.
Older heads are better to work than ecotec shite from what i hear but i have not got any experience to back this up.
Other than that id say, like pretty much anything, boost it to 6 or 7 then pay close attention on the dyno & the road for a while see whats the weakest link before going any further.
If its a lexcen, please de-badge it!
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Location:
Brisbane
Registered:
July 2005
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Re: vr commodore/lexon. boosted engine?
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Fri, 04 November 2005 03:03
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Series two has a restrictor in the inlet to the valley plenum coz too many grandpas complained about torque in the series 1. This will be mildly detrimental flow in any boosted application.
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takes about 10 minutes to remove tho. Then this motor becomes on of the best base 3.8L for modding i am told.
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Location:
Toronto, Downtown
Registered:
September 2004
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Re: vr commodore/lexon. boosted engine?
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Fri, 04 November 2005 03:14
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if it breaks its not like its going to be hard to find another one those motors grow on trees
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Location:
Rocklea qld
Registered:
February 2003
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Re: vr commodore/lexon. boosted engine?
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Fri, 04 November 2005 12:41
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ive already got a turbo manifold and turbo. plus all the other things like boost controllers etc. ive got access to intercoolers for free and can do my own exhaust so its all gonna be basically cost free. i also have access to a dyno for $60 a hour and they can remap the v6 ecus to handle a bit of boost. the engine is in reasonably good condition and i dont see any reason (in theory) it wont handle the boost. ive heard very bad things about the ecotec engines so ill be staying away from that. just dont want to do all this and blow the engine due to it just wont handle it.
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