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Originally Posted by turbo2nr
Scott, I read all that. It did not exactly say whay model. I'll take a guess.
So that is a http://turbobygarrett.com/turbobygar...S_739548_1.htmGT2860RS - 739548-1? Ballbearing, the larger "S"cover for higher flow.
I'm guessing you guys went with the smaller turbine housing, .63 A/R , since the engine is on the smaller side. I would have. Looks like a perfect match.  |
No no, not the .63 A/R. In the T2 housing it's too small for the NS111 turbine wheel which is the sweetheart of the 2860RS and up. In a mid or large frame turbo, the .63 (I.E. The old school T3 turbine housings) is much larger. Best way to reference these items is too look at the turbine flow maps on the website. That gives you an idea of overall exhaust flow and you will see the .86 and NS111 wheel is around the same as a .63 ar in the GT30 series which is a modern day version of the old school T3/T4 hybrid for the most part.
Garrett has done a million combinations these days based on all the hack it up mix and match "turbo houses" creating all the hybrids and such - Garrett decided to make their own hybrids to minimize the bastardization of their original designs as much as they could.
The GT28RS used to be had only one way. As the 739548-1 comes and with a .86 housing. That is what we are using. The original Garrett design. You can upgrade to the GT2871R models as well and they will swap out directly for the GT28RS. That small frame turbo maxed out will be able to support about 450crank or 400whp in the form of the turbo 743347-2 so there are plenty of upgrades in the small frame turbos to cover the run we would want in the Elise. Going to the medium frame turbos will do nothing but add expense and increase weight for this application.