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Old 06-19-2008, 06:32 AM   #1 (permalink)
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Default VGT turbos

what do yall think about variable geometry turbos?
just planting seeds...
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Old 06-19-2008, 06:42 AM   #2 (permalink)
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Default Re: VGT turbos

Quote:
Originally Posted by numbertwo View Post
what do yall think about variable geometry turbos?
just planting seeds...
Several of us have already had this discussion. The limitations are discussed on page 2 of this thread.

KKK K26 or K27 Twin turbo setup on a 3.8L?

Basically, they are designed for the lower EGT of a diesel and won't hold up to the higher EGT of gas engines
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- Huge exhaust that serves no purpose but to make the car louder
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- A "performance intake"- a tube that feeds cold air to their engine usually located in areas of excessive heat (behind or on top of the engine)
- Most of these riced cars (a.k.a. rice rockets or rice burners) are imports; Honda Civics, Accords, Integras, CRXs, RSXs, Del Sols Mitsubishi Eclipses, Lancers, Subaru Imprezas, however there are some domestics such as Chevrolet Caviliers, Dodge Neons, Ford Focus; small, slow, economy cars designed specifically to go slow. Please note that some 3000gt's Supras, Skylines, WRX's and other higher performance imports are designed to go fast, and are therefore not always considered rice, but it really depends on the severity of the case.

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Old 06-19-2008, 06:50 AM   #3 (permalink)
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Default Re: VGT turbos

thanks, but from what I understand that some porshes use them
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Old 06-19-2008, 08:36 AM   #4 (permalink)
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Default Re: VGT turbos

Ask any of the guys at 3SX what I think about these things. Diesels be damned, I want my VGTs!!!
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Old 06-19-2008, 07:30 PM   #5 (permalink)
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Default Re: VGT turbos

Quote:
Originally Posted by numbertwo View Post
thanks, but from what I understand that some porshes use them
i believe i read an article a year or so ago about them. they are supposedly the first that are able to withstand the temps of a gas engine, but use some fairly expensive material to do it. hence why they are in porsche's and not much else.
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2003 Subaru Forester 2.5X, Blue, Sept. 2005, Daily Driver with 165 HP of Fury! At least it's AWD.


305 awhp, 325 awtq(BPU minus full catback exhaust)Mods at that time
13.02@104.67 (9bs, dp, fipk, 15.5 psi, bov, no cats, streetmax clutch, 1.77 60', decent conditions, full weight (even spare tire/jack)
13.09@105.08 (1.80 60', same conditions as above)
Beyond BPU: (meaning upgraded turbos/fuel/etc) before engine rebuild Mods at that time
12.38@113.00(20 psi, 110 octane, massive knock above 6k rpms)
12.41@115.10(ditto)
After Rebuild: Current Mods Dyno Tune by IPS
12.8@108 (12.5 psi dropping to ~11 @redline, 2.0 60', pump gas, my tune)
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Old 07-14-2008, 08:44 PM   #6 (permalink)
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Default Re: VGT turbos

Quote:
Originally Posted by spfan View Post
i believe i read an article a year or so ago about them. they are supposedly the first that are able to withstand the temps of a gas engine, but use some fairly expensive material to do it. hence why they are in porsche's and not much else.
wrong, chrysler/dodge were using these on production gasoline 2.2/2.5 four cylinder engins in the early EARLY 90s i believe (90 through 93-94 i believe) They were used on the dodge daytona and lebaron i believe.
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Old 07-14-2008, 08:58 PM   #7 (permalink)
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Default Re: VGT turbos

Yeah, you're thinking V->N<-T's, not VGT's. VGT is the proprietary name for the turbos used on Porsches. Yes, they're the same thing in theory, but VGT's are different enough to have their own set of patents (I believe a third party manufacturer designed them for Porsche)

They are, as far as I know, not available for sale outside of repairs for Porsches that had these turbos for their original equipment. I've only done some brief research into them (few hours worth), so you MIGHT be able to find them with more scouring, but at this point, your best (slim) bet is to find a trashed/totaled Porsche and buy them that way. In any case, it isn't going to be easy, or cheap. You're better off with DBB turbos and proven kits.
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Old 07-14-2008, 09:03 PM   #8 (permalink)
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Default Re: VGT turbos

vgt's aren't propritary. trucks have been using them for years. ever looked at a cummins turbodiesel?

i could be mistaken, but i'd bet that a whipple supercharger would still cost less than vgt's. and they'd probably still offer a better torque curve.
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Old 07-14-2008, 09:15 PM   #9 (permalink)
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Default Re: VGT turbos

Yeah you're right. The name itself isn't, but the design that allows them to work efficiently on a fuel injected combustion engine is. A diesel VGT is not the same as the ones that Porsche uses.
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Old 07-21-2008, 03:37 PM   #10 (permalink)
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Default Re: VGT turbos

it is also on some euro VW's but the existing configurations are not viable for our application.
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