Trucho-951

Very exciting thread, good luck, may the boost be with you...

Dave951

The lasting impressions from driving the car are profound and IMO the power levels that are obtainable are definitely within the "OH ****!!" category. Or at least that's what all my passengers say. The GT30R does take longer than the K26 to spool up but still is within my definition of acceptable. I think of the K26 as a rubber mallet and the GT30R as a sledgehammer. Certainly you can swing the mallet quicker but it doesn't hit very hard, while a sledgehammer takes a little longer to pick up and deliver but hits hard as hell. Another note is that spool times could be reduced slightly by using the anti-surge inlet instead of the standard at the cost of overall output.

The installation had its woes as most do when dealing with this level of complexity. Additional modification to the crossover pipe need to be done to allow it to reach the turbo since the GT sits higher then the K26. And you need to be creative in your routing the coolant pipes to the center section of the turbo. That being said though I wouldn't have done it any differently if I could do it over again (except having a larger budget to buy and install more go fast parts at the same time). Too many great lessons were learned by doing this installation to ever wish it never happened. Though when variable turbine turbos become more readily available and affordable I don't know if I'll be able to refuse.

Pauerman

Dave,

You mention that your 30R isn't equipped with anti-surge, are you referring to the compressor housing? Didn't your 30R come with the 4" port shrouded compressor housing? I thought that the port shroud was used to prevent or decrease the chance of surge.

BTW, great info on your install. Thanks for the pic of your adapter.

Chris White

Nice write up, pretty much exactly the same set up that I am using on the 3.1 16v engine (except the I went with the stage 2 headers).
Should be fun!!!!

Dave951

My terminology was a little off, but what I meant is that my GT30R does not have a ported shroud, instead mine has the standard shroud (Like Porschefile's GT35R pictured). Your thoughts on its purpose are correct. Though a properly sized turbo for a given application shouldn't require this additional feature.

Honeywell / Garret says:

A Ported Shroud compressor is a feature that is incorporated into the compressor housing. It functions to move the surge line further to the left by allowing some airflow to exit the wheel through the port to keep surge from occurring. This provides additional usable range and allows a larger compressor to be used for higher flow requirements without risking running the compressor into a dangerous surge condition. The presence of the ported shroud usually has a minor negative impact on compressor efficiency.

Porschefile

Compressor surge housings by themselves do not decrease spool times. Actually, in most cases they technically increase spool by ~100-300rpm or so.

Premier Motorsp

Why the monster sized oil line?

Chris Cervelli
Premier Motorsports

Dave951

You are correct. I don't know where I drew that incorrect conclusion from especially with the fact that surge housing decreases overall compressor efficiency. (Insert emoIcon with a dunce cap).

333pg333

I'll be interested in your tuning pursuits with the standalone.

Porschefile

The stainless braided exterior is pretty generously sized, though internally it is not quite that size. At the moment I am not sure exactly what size restrictor was used, however it is an AN restrictor threaded into the oil port inlet.

Here is a shot of the turbo mount part of the center section since some of you asked:

Duke

BTW I just want to add in that this thread is great...
I got a "very" similar turbo for my project last year but the engine won't be finished until this spring.
Will be great to compare the results with other GTBB-big-boy-brothers

What are the plans for the rest of the engine? Stock displacement? Stock 4-2-1 headers? What cam? What EMS?

Porschefile

Thanks Duke. If you don't mind my asking, what kind of turbo are you going with, and do you have a specific power goal in mind?

My plans for the rest of the engine is to MAKE UP MY MIND! I'm so indecisive much of the time, and there are just too many routes to take with a project like this. I've considered a 2.5 16v, 2.8 stroker or bore 16v, and a 3.0 16v (S2 motor). Ultimately, I've come to the conclusion that I do want to at least use a 16v head (preferrably the S2 from what my research has shown). Judging by what a few others have said, apparently the 16v heads flow some insane cfm numbers. That by itself doesn't mean much, though I have some theories related to this topic that I will get into a bit later. Before too long I'm going to hopefully buy an S2 head, have it flow benched and go from there. Because I want to go with a 16v head, and because of the power level I'm looking for, ideally I will have some custom cams made for the specific setup. Also, I'm planning on going with an AEM engine management. I'm going to eventually go with the SFR Stage 2 headers.

RolexNJ

Kool. Let's finally get some hard data for the public! Why not flow a S2 versus a 968 head and go from there on the project? I'd love to see the differences. What are your RWHP expectations again, now with a 16V head too? And lastly, be forwarned, the SFR Stage 2 Headers "will" shift that curve a bit. Fact, not fiction my friend. I look forward to hearing some concrete data from your findings.

Cheers,

Porschefile

My horsepower expectation hasn't really changed. I mainly want a 16v head to be able to hold power better on the top-end as well as to be more efficient so I won't have to run as much boost and to take better advantage of higher rpm. I'd like to flow both heads, however that's quite a few thousand $$ for just a couple heads and just to flowbench. I'll do what I can, but I'm not made of money. I completely understand about the stage 2 headers, though I feel the improvements would be necessary considering the power level I want.

RolexNJ

You would fool me with those nice list of cars you have down below?