What is a GT67 turbo?

I'm looking to build a STS style setup a little at a time. I've seen the results with the 60-1 turbo, and would like to go to the next level since I already have a FMIC. It has been suggested that I use a GT67 turbo. I've tried to find information on these and there is very little.

The Garrett catalog goes from GT42 to GT60 and stops (these are big turbos- the GT60 is too big anyway). I also have been unable to find a compressor map for this unit.

After running my motor on the Dyno2000 program and plugging it's numbers into my TurboCalc program, based on flow numbers, I should have a 62-1 or a 56 trim GT42. I like the imporved technology of the GT turbos and they are not that much more expensive. However, the rear mounting will have some effect here, but I have to think the total flow remains the same regardless of where the turbo sits, i.e. 65# is still 65#, and if I put too small of a turbo on it, this is not a good thing. From what I've learned, I would be better off w/ a larger turbo & a smaller turbine A/R.

I have no specs whatsoever on the GT67.

Thanks for any help or info.

There is no such turbo as a GT67 - and if there was, that would be far too large to stick in the back of a car... I think they are actually commenting on the T67 turbo...

If they are referring to the T4 based T67 Turbo (and not the T3 based) these are some rough things I have on my hard drive:

Turbine is usually a P or Q trim w/.68 AR housing
Compressor is a 63trim 67mm wheel
Max flow I believe is roughly 70-75lb/min w/.70AR

Also a note is that placement of the head unit will dramatically effect output - dont make that mistake. Compressor maps that you find on the net are set for high pressure/ high temp inlets. As such you may not be physically able to spin the compressor that fast and thusly not capable of the same maximum flow or anywhere near the same efficiency. I'd say you shouldnt rely on any compressor map you find on the web for a given turbo... But thats just me. If they (STS) reccomend using some sized turbo, you'll have to do the calcs yourself and see what data you come up with or take their word for it - but there still isnt a lot of data on mounting turbos in the rear (As far as effects of output) goes.

Thanks for the info Geoff.

I got an email from STS & they gave me a really decent price on the setup.

I have a few questions, but it looks like they are within a few hundred dollars of what my cost would be to make my own, and it would be better to get it from them, so I will probably go that route.

I'm over the hump on my SES light issue with the knock sensor (have two black rubber marks on my driveway to prove it ;)), so I'm ready to Start Turbocharging Soon :D.

Geoff is correct on the T67. It is a standard garrett unit.

Jose

The T-67 is a large upgrade on the Buick 3.8 turbo's. Precision Turbo's website lists 4 different versions. They include a P-trim turbine, GTQ, and GTS. Available A/R's are from .68 to .96. Max hp is listed at 780.

Mike

John @ Limit Engineering (the same guy that identified the turbo I bought as a TP3801 vs a GT42) gave me some great info on this:
The GT67 turbocharger is an aftermarket unit that is built with a GT based compressor. The compressor is 81.50mm, 63 trim. It is a very good compressor as long as the boost is below 25 PSI. It has a maximum flow of 73 lbs/min. Normally it is driven with a 76 trim T4 turbine wheel. The compressor housing can be 3" inlet and 2" outlet or 4" inlet and 2 1/2" outlet. The turbine housing options are (all tangential), A/R .70, .84, 1.00, 1.15, 1.32 and 1.52.

I'm looking for 14-15 PSI for now, so this should do the trick.