Right now, if you want a T4 35R, you have two choices; ATP, and Precision.
According to Garrett, here is the difference.
ATP; ATP mimics the Garret internal geometry, and does so with a T4 footprint. So, if you like the 35R to spool the way it does in a T3, but want a T4 manifold, this will get you the closest (AR for AR).
Precision; Precision has their own design, supposedly, the turbine housing has been modified to better match the better flow potential of the T4 footprint(AR for AR). So, if you are looking for a little more top end, and probably a little slower spool, Precision may be for you.
All of the above is based upon conversations at the Garrett booth, and not ATP, or Precision, so take at for what it is worth. Obviously, choices of AR are limited, so look at that as well. Carl

 

Well at least they said nothing about what I have going.

 

Talk to us Actually, I believe you have previously mentioned what you are working on. I look forward to seeing more success for you, and your company, Regards, Carl

 

I went to Garrett's booth this weekend as well, and asked about the 35 turbo all they had was the 28? and 40 ... I belive... and I told them I had one on order, they asked me from who, I replied from A-Spec Tuning, and they just looked at me puzzeled... so I guess you're not very famous @ Garrett Zero R

-DC

 

I'm not too worried, I hopefully will have stuff in hand by the end of January I want something that gives pretty close response to the 35R with more top end we will see what comes up.

 

Go Sean Go

 

This is funny, because when I asked one of th reps about a 35r with a t4 footprint he had no clue. Maybe I got one of the second string reps?

 

End of Jan !? So what am I getting in Mid Jan !? Second Hand Junk !?

 

keep in mind at the garrett performance booth, most the people working it actually work for precision. precision gt35R is what im running.

 

Do Tell... Why do you say that, and why, is the contact info for the gentleman I talked to at Garrett, not Precision? I never heard any of the guys there recomend a shop by name, other than if asked about a particular shop. Who exactly at the booth at JGTC this past weekend works for Precision(name please)? What AR, and footprint are you using, and on what car? Not that I do not believe you, just curious. Thanks, Carl

 

haha, It is cool. I am new to the rx7 forums. I run a GT35R w/ .63ar T3 Precision 5 bolt turbine housing. It is on a honda. I've always been an RX7 fan and lately I've been thinking more and more about getting one.

As for my statement in the post above; Precision is considered a "garrett performance distributor." One of 5. If the booth is man'd by the same people who man it for the Nopi/NHRA racing circuit & SEMA(which I assumed it was) then probably half of those people helping out are precision employee's. The goal at the events is to promote and represent garrett turbos. They will point you towards a distributor depending on what you need or your location. Did you happen to talk to Jim, Harry or Rod?

 

I did not talk to any of those guys, I know Harry(through conversations), and have talked to Jim before. The guy I talked to mainly was Brian Reigner. All the other guys seemed to defer to him on more difficult technical questions. Anyway, after talking to them, looking at their cut-aways, and getting explanations for the problems some have encountered with the DBB, I feel alot better about talking the tech side of these turbos. One other interesting point was that none of the guys would make the statement; "A DBB GT turbo will spool X RPM faster than its journal bearing counterpart" The differences I am aware of real world tend toward 250-300 rpm difference. Most times, people are either not running the GT wheels or housings on their journal bearing turbos(so it's not really apples to apples), and that is why the street perception is that DBB is 400rpm, or more faster than its journal bearing counterpart. Actually, the Journal bearing alone from an engineering standpoint is a more efficient bearing than a BB. I suspect the advantage actually comes from other efficiencies that are allowed when using the BB assembly. Happy Holidays, Carl

 

Cool, usually the Precision guys are there to help with technical assistance since most of the garrett people are sales/marketing. Brian is a good guy too. I talked to him at sema for a bit. I definitly agree w/ you on the benefit's of ball bearing; It's not just about quicker spool but its about turbine efficiency too. I've never done a back to back test between journal or bb, but I trust in the theory of how it works so thats good enough for me.