Which Turbo to Use?

[Norm K]

Can you tell me if this FS:Garrett GT3071R Turbo turbo would be adequate for a good-weather-drive-it-on-nice-weekend-days 1980 930?

It would replace the stock 3LDZ and would be installed along with a new headers, Borla Muffler and (probably) Leask WUR. Following fairly soon will be an upgraded intercooler. My ultimate performance-level aspirations are fairly conservative; somewhere in the 400/hp range, which I think it attainable with the mods I'm looking at(???).

On the turbo subjet though, I've puzzled and puzzled til my puzzler was sore, but it seems the more I read the less certain I am as to which direction to go. Given current budget constraints, I'm leaning toward going the local Craigslist route where, not surprisingly, there is a dearth of direct-fit options.

I'm fine with fabbing a new bracket and (within reason) a little tin cutting and oil line adapting if it means I don't have to shell out $1,500-$2,000 right now.

I'm new to the whole NA thing so I could really use a little help.

Thanks!

Norm

[Tippy]

I believe a few peeps here have used the GT30 with success. My only reservation would be the .63AR on a T3. Boost will be with gas pedal (very quick spooling) I'd imagine but it may be severely hp limiting on top end.

[herman maire]

I think the turbo on my engine is a modified garrett GT35. The Gt35 has been used in a lot of high HP builds.

You should also consider RarlyL8 (active member on these forums) for your CIS and WUR mods and needs.

[Norm K]

Originally Posted by herman maire

You should also consider RarlyL8 (active member on these forums) for your CIS and WUR mods and needs.

Yup, I've spent a fair amount of time reading Brian's posts. Pretty sure even he recommends the Leask WUR but if he has a more cost effective (as well as being an effective option) way to go maybe he'll chime in here.

I've found several references indicating that the 1980 ROW CIS should be sufficient in trying to reach 400hp (combined with the WUR, headers, Borla muffler, and (soon, I hope) a Rarly8 intercooler. Before installing any of these, a good AFR meter will be in place, as well as a where-the-clock-is-now boost gauge.

[mooney265]

Originally Posted by nkowi

Yup, I've spent a fair amount of time reading Brian's posts. Pretty sure even he recommends the Leask WUR but if he has a more cost effective (as well as being an effective option) way to go maybe he'll chime in here.

I've found several references indicating that the 1980 ROW CIS should be sufficient in trying to reach 400hp (combined with the WUR, headers, Borla muffler, and (soon, I hope) a Rarly8 intercooler. Before installing any of these, a good AFR meter will be in place, as well as a where-the-clock-is-now boost gauge.

Go ahead and pick up a good set of CIS gauges, too... And practice using them...

[Bisimoto]

Norm,
The GT3071 has a 53.1mm inducer, and looking at the compressor map, it supports about 47 lbs/min. This would reach your 400hp goals, but with so many China imitations out there, make sure you are purchasing from a reputable dealer.
The 35R bumps up to a 61mm compressor and can support up to 600+hp.

I, however, prefer the Turbonetics brand of turbos, and they can be customized to your setup. My Blue 911 runs 61mm billet units, and can be had at a cost effective price. Feel free to PM me for details. Thanks.

[Norm K]

Looks like I'll be going with the tried & true K27. Thanks for the deal, Philip, I can hardly wait to replace the 3LDZ!

Norm

[speeed racr]

Bisimoto What clutch do you use? for that power?

Originally Posted by Bisimoto

Norm,
The GT3071 has a 53.1mm inducer, and looking at the compressor map, it supports about 47 lbs/min. This would reach your 400hp goals, but with so many China imitations out there, make sure you are purchasing from a reputable dealer.
The 35R bumps up to a 61mm compressor and can support up to 600+hp.

I, however, prefer the Turbonetics brand of turbos, and they can be customized to your setup. My Blue 911 runs 61mm billet units, and can be had at a cost effective price. Feel free to PM me for details. Thanks.

[Raceboy]

If one looks for a very efficient compressor with superb spoolup and does not want to sell kidney for a GT/X series Garrett, I wouldn't use anything but a nice Holset HX40 Super with #16 twin-scroll turbine housing.
And it is actually better than GT30R or GT35R.

The blue line is Holset HX40, red is GT3076R.

[Bisimoto]

Originally Posted by speeed racr

Bisimoto What clutch do you use? for that power?

It is a custom unit, comprising of a 6 puck, semi-metallic disc, unsprung, with a heavy duty single diaphragm presure plate. Thanks.