I've tried to dig up this info, but I read in a magazine that the Yellow Drifting Z (I'm sure you've all seen this yellow/black Z it's run by some guy that's famous blah blah blah professional racing blah blah blah . . . ) and it said he had the APS TT kit and it uses GT25R Ball-Bearing Turbos.

So they are GT25R's? I asked Peter from APS and he said he didn't know the specs.

Thanks

 

peter from APS is lying to you. They think they're being crafty by keeping the specs secret, but they're ordinary Garret cartridges, wheels, and housings.

 

I heard they were GT25/35 Hybrids. From another source, they were GT2871R's

Any thoughts?

 

GT2871s seems to be the generally accepted truth. Although I have heard APS makes their own compressor housings so I'm not sure what the A/R on the compressor is...

 

With certainty, the cartridge for the ST setup is a standard, off-the-shelf gt35r (aka gt3582r) cartridge ($970 shipped from AGP Turbo).

Can't ever seem to find any documentation on the housings, however.

 

The Single Turbo kit uses a larger Turbo then? Interesting they would do that . . .

First of all we need to find the housing for the Twin Turbo kit . . . . compressor is probably (like 99.99% certain) custom-made to APS specs. as well

Thanks guys.

 

I know my turbos from the extreme kit are the GT71R hybrids.

 

Going by the trend . . . GT35R housing hybrid for the Single Turbo . .

GT71R Hybrid for the Extreme kit . .

If the normal TT kit uses smaller Turbos than the single, I'd say something like a GT25R Hybrid? Using the housing of a larger Turbo . . .

Thanks for all of your help. I hope to crack this mystery soon.

 

The Extreme kit has larger turbos. No GT2871R turbo configurations I saw in Garretts catalog can flow the 800 HP of air APS is talking about... I think those are larger. Of course no ones until they tell us..

 

Ditto on the gt2871. For the hp numbers they claim at 16 psi gt25 just to small.

 

hm...that info was from Sam@GTM.

 

You did mean GT2871Rs right? It could be a GT3076R but theres no way its a 2871R. All three configs of that unit flow less than 50 lb/min. The only 2871 are that comes close is the 56 trim unit. But that only flows to 46-47 lb/min. Compressor map attached. APS claims over 50 lb/min of flow each:

The smallest unit Garret makes that flows 50 lb/min or more is the GT3076R. Not even the GT2876R or 3071R will come close... GT3076R map attached also..

 

thanx for the info. From the specs it does look like the extreme kit has to flow more than that...

 

It would have to or the APS power numbers are way off. I have a feeling the regular twin kit is some form of 2871R. But the Extreme kit has to be 3076Rs or larger...

 

hm...here are a couple actual pics though...

 

Hmm I don't see any turbos in Garretts catalog with the same A/R config on the compressor and turbine side that flows over 50 lb/min. They could be using a smaller compressor housing and machining it out but that would be weird. it would increase the A/R of the compressor no doubt. Still the highest flowin GT28XXR compressor Garrett makes is only efficient to 48 lb/min. Not over 50. If someone measured the inducer and major diameter we would know for sure.

 

Are we now talking about the Extreme kit? If someone could please clarify thanks.

 

And have you yet seen any APS equiped car make over 700WHP which would equal 800CHP? Nope..Not even APS has done it with their standard turbos..

 

I assume the 800hp claimed flow capability is, of course, subject to the flow capability/restrictions of the heads, intake piping and intercooler... So it makes sense that you can't take full advantage of the full airflow capability of the turbo.

That said, I pretty sure someone was a shade over 700whp on stock APS turbos, marluci (sp?).

 

We actually have two discussions. The charts I posted are what I thought were the standard kit and my guess on the Extreme kit compressors. But the housings don't match any out of box config Garrett has. Not that they aren't the units as they could have new or custom compressor housings. Although the housings appear to be out of box Garrett units..