Turbo gods Help! Turbo Rebuild Mismatch

[Sailor96]

So I went for a autoX'ing event, after the finish of the first go the turbo bearing went.

I have a new CHRA that i'm testing from "Turbo Rebuild Limited" as their standard 270 degree bearing variant, as they offer an uprated 360 degree one as well specifically for the GTIR.

When I took the old one apart two things happened, one the housing had multiple cracks tracing around the CHRA turbine housing seal ring and interior, and the housing is a 0.64A/R. The turbo that was in there is not standard and I believe it's from a S15 T28 turbo (as its PN 14411-91F00 suggests).

The CHRA I received was meant for a GTIR and wouldn't fit the with the turbine housing I had on hand, so I bought a genuine garrett T25 turbine housing with a 0.86A/R IWG.

However I just tried assembling it back together and find it also is not the right size. The CHRA turbine side flange is much smaller than that of the turbine housing I have and the trim must not be the same as the turbine will not clear the housing completely ( though it is very close)

Can anyone point me in the direction of what specific housing I need??

I've attached some pictures to show the difference in the OD of the CHRA turbine size and the ID of the Housings' flange for reference

TIA

 

[Sailor96]

I've come to realize the ball bearing and journal turbine housing use different diameters and the standard is only 4 bolts not 6.

 

[Cathode]

This sounds like a right ball-ache. I hope you get this sorted out. You know more about this than I do.

 

[Sailor96]

I wouldn't go that far only took a few hundred bucks to figure that information out. Honestly I had no idea that there was a non standard turbo installed until I received the new housing and it wouldn't fit the CHRA. I figured it was the same as standard, not some S15 turbo replacement jobbie. Curious how different the car will feel with the "actual" standard sized turbo as I feel like it might have been a restriction

That's what moneys for though, I'll wait for the parts to get here and at the same time build the other engine up since I just got parts back from the machine shop. Who knows, maybe I'll beat the postage man to it and have a built motor in before it arrives

 

[fubar andy]

Just buy a new off the self turbo.

A nice GT2871RS (0.68 or .82) will be fine, change over the housing from the S14 version they will sell you and install the GTIR housing you should already have.

Here in the UK, Owen Developments is where I ordered my turbos, but they always come with S14 intake housing. (because GTiR "doesn't exist")
It'll make good power and will run well on the car.

I've recently ordered the GTX2871 Gen2 version, but the housing is larger and the cold side housing from the older 2871RS won't fit the new GTX turbo.

I'm in the process of custom making a manifold/spacer to fit the GTX, as it rubs against the gearbox housing, which is a pain in the arse!

If WHP isn't you main goal, a 2871RS will be fine for your needs...

 

[Sailor96]

Just buy a new off the self turbo.

A nice GT2871RS (0.68 or .82) will be fine, change over the housing from the S14 version they will sell you and install the GTIR housing you should already have.

While buying an off the shelf turbo is enticing, dropping 1300usd on something that is soon to be replaced seems... impractical. Thing is, I'm building an engine that already has PSR2871 (G25-550 Clone) dedicated to it. In the meantime I'd like to have it running and driving without double dipping in my bank account

Like I mentioned, I don't already have the GTIR turbine housing. It's out of an S15 that was swapped in by the previous owners hands. Which is the problem because I'd already gotten a CHRA for the standard turbo