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Join Date: Dec 2006
Location: Chalfont, PA
Posts: 93
Which turbo? Need some help with T4 vocab.

Thanks to fellow pelicaners, i learned that my manifold has a t4 flange.

Now the next question is: which t4 for my motor?

I have a 2.7 that's been totally updated and has never had thermal reactors (was delivered in '74 with an 11 blade fan and the early exhaust). It has S pistons (8.5:1), case savers, studs, carrera chain tentioners, Tbitz fuel injection MSD 6, etc. I just bought a SS intake manifold for it. Other wise stock.

Where should i start with a turbo? I've read "Maximum boost" so I have a pretty good basic understanding of the lingo and what A/R ratios are.

I get confused with the "trim" part of garrett termainology.

Looking for decent midrange punch more than huge top end power.

Any ideas?

Thanks.

pat

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'74 911 options delete no sunroof. lowered, swaybars, tie bar, braided brake lines, corner balanced, "s" gauges, 993tt seats, Momo wheel and knob, 993 mirrors, blacked out window trim, H4's, short gearing, S pistons, stand alone EFI, other stuff.
Old 05-09-2009, 11:20 AM
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Any help out there?
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'74 911 options delete no sunroof. lowered, swaybars, tie bar, braided brake lines, corner balanced, "s" gauges, 993tt seats, Momo wheel and knob, 993 mirrors, blacked out window trim, H4's, short gearing, S pistons, stand alone EFI, other stuff.
Old 05-11-2009, 05:15 PM
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What is your HP goal? What octane fuel will the car run on?

Perhaps something like a GT3076 .70 A/R T4.
Old 05-11-2009, 06:05 PM
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Looking for 250hp +/- on high grade pump gas. I did some reading and understand the "trim" aspect now.

You mean .70 A/R exhaust right?

I've looked at the new turbo's (there's tons of info on Garrett's site about the new stuff), but i'm hunting for a used turbo. Not ready to drop $750-$1,000 on a new one yet.

The old ones don't have the easy nomenclature.

What's comparable to the Gt that you listed?

Thanks.

pat
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'74 911 options delete no sunroof. lowered, swaybars, tie bar, braided brake lines, corner balanced, "s" gauges, 993tt seats, Momo wheel and knob, 993 mirrors, blacked out window trim, H4's, short gearing, S pistons, stand alone EFI, other stuff.
Old 05-11-2009, 06:09 PM
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Join Date: Dec 2006
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How about a K26 from a 951?

I can make the flange adapter.
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'74 911 options delete no sunroof. lowered, swaybars, tie bar, braided brake lines, corner balanced, "s" gauges, 993tt seats, Momo wheel and knob, 993 mirrors, blacked out window trim, H4's, short gearing, S pistons, stand alone EFI, other stuff.
Old 05-11-2009, 06:20 PM
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Get a stock 3LDZ from a 930- somebody has to have one laying around- that will be enough for you power goals and won't break the bank. If you want some more power later on- go with a GT-35R with a .63 T-4 hot housing- that should make her spool up real well. I am not 100% sure that they make a .63 in a T-4 flange though...
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86' 930/GT-40R Sold
94' Rustang GT daily (long gone)
2008 C6/Z51 Corvette
Old 05-12-2009, 05:14 AM
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I think what you are dealing with is a manifold built for one a Thompson/Rayjay turbo of the late 60s early 70s. In the industry we call these "on center" turbine housings because the foot was located in the centerline of the shaft (the other connections are unique also but can be easily adapted to). Garrett picked up this turbo and even engineered a T4 to this outline but it’s truly not worth the effort.
Kris' advice is really spot on. Buy a used 930 factory take off headpipe and 3LDZ. The 3LDZ was obsolete when first installed on these engines back in 1975 but the "outline" is still supported with modern product. Get you motor running under boost first then finesse the hardware if you wish.
These projects are a lot of fun and in many ways cheap if you do a lot of shopping on Pelican, eBay and Craigslist.

Old 05-12-2009, 06:37 AM
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