GT2871r, .63 or .82 exhaust housing? (or gtx29/30)

[mrk1]

Originally Posted by mhiscott

Nice! Yes that's the exact turbo I have. I seem to remember there was some compressor fin damage or something. It's been years since I've looked a the turbo. Will grab some pics of it tomorrow, it's at my parents place.

The video sounds great. I loved the noise that turbo made on my ae86.

http://www.atpturbo.com/mm5/merchant...egory_Code=GTH

The above turbine housing would allow me to drop in the gt2860 in the spot where the 4854 is now with little to no changes. A strange note on the atpturbo page though...

T31 (T3) turbine housing with 4 bolt outlet. Fits turbine wheel found on GT28RS, GT2876R (GT25/40R) and all GT2871R turbos. Turbine housing A/R is Garrett T3 .63, or .82 A/R. Turbine flow rating of .63 A/R T31 is comparable to T25 flanged .86 AR.

The turbo currently has a t28 .63 ar housing. Seems they are suggesting the housing size difference between the t3 and t25 is significant even without the AR change.... I suppose I'd still get the .86 AR four bolt t3 housing to achieve similar performance to the v band tial housing you're running? Very nice housing btw. I wish I had went with a vband mani...

Lastly, as far as spool, in third gear from an off throttle roll, would you have full boost by mid 3k rpm?

Go with the .82 no one likes a turbo that falls off up top, yeah its certainly humming along nicely before 4k

[mrk1]

Originally Posted by mhiscott

A strange note on the atpturbo page though...

T31 (T3) turbine housing with 4 bolt outlet. Fits turbine wheel found on GT28RS, GT2876R (GT25/40R) and all GT2871R turbos. Turbine housing A/R is Garrett T3 .63, or .82 A/R. Turbine flow rating of .63 A/R T31 is comparable to T25 flanged .86 AR.

This makes perfect sense as AR is more of a ratio not a finite measurement.

[mhiscott]

Originally Posted by mrk1

This makes perfect sense as AR is more of a ratio not a finite measurement.

I suppose going from the t25 to the t3 housing, the radius would be similar, but the area of the inlet would be larger, and throw things out of whack for direct comparison.

I need to read up and understand how to decipher compressor flow maps. I should really make sure the math works on this first to ensure whatever I do go with matches up with the engine's sizing and goal power output so I can get the most efficiency possible out of the unit I choose.

Does precision not publish flow maps for their turbos? I'd like to compare what I end up going with against the 4854 I was running last season.

[mrk1]

Precision does not publish compressor maps, kinda a pain.

I did my research with the 28RS compressor map and was very pleased with what I saw. With out E85 I didn't want to buy to much turbo and have a bunch of capacity I could never use.

[mhiscott]

That is a bit of an annoyance. Strange they don't being such a large manufacturer...

I'll update later with some pics of my gt2860rs. I hope it's still use able.

[mhiscott]

Ok here are some pics of the gt2860rs I have. As I had thought there is some very minor dinging on a couple of the turbing wheel fins, and on one of the compressor wheel fins. Pictures below. If I remember correctly, I had run this for years on my AE86 with these small dings present and all worked fine.

What do you guys think?

Here's the turbo itself



Here's the compressor wheel. See the slight curve on the one fin at 9 o'clock.



Here's the turbine wheel. See the last few mm on the two fins at 6-7 o'clock

[86drift]

The 2860 is too small and wont hold boost to redline. Been there, done that.
I now run the GT2871R with 0.6 rear. Super responsive and holds boost til redline. You could go to the 0.8 rear housing without a problem and it'd make more power up top.

If it was a track car I'd go GT30, but the 28 is perfect for low boost street work.

[FRS Justin]

No shaft play, I say bolt it on!!!!!!!

[mrk1]

Originally Posted by 86drift

The 2860 is too small and wont hold boost to redline. Been there, done that.
I now run the GT2871R with 0.6 rear. Super responsive and holds boost til redline. You could go to the 0.8 rear housing without a problem and it'd make more power up top.

If it was a track car I'd go GT30, but the 28 is perfect for low boost street work.

My setup holds 12psi to redline just fine, I didn't have it put on the dyno chart but its pretty easy to watch my digital read out boost gauge while the guy was doing the dyno pulls.

[mrk1]

Originally Posted by mhiscott

Ok here are some pics of the gt2860rs I have. As I had thought there is some very minor dinging on a couple of the turbing wheel fins, and on one of the compressor wheel fins. Pictures below. If I remember correctly, I had run this for years on my AE86 with these small dings present and all worked fine.

What do you guys think?

Here's the turbo itself



Here's the compressor wheel. See the slight curve on the one fin at 9 o'clock.



Here's the turbine wheel. See the last few mm on the two fins at 6-7 o'clock

The big ticket he is that your already own this one. Why not swap out the turbine housing and give it a try

[mhiscott]

That is true... The exhaust housing I'll need will cost ~ 500 CAD shipped is the thing. If I have issues with it, I'm down that much cash against the price of getting a newer unit. I'm sort of torn on what to do atm. I've e-mailed Garrett some pictures to see what they suggest. The bends to the turbine wheel are more extensive than the compressor wheel. No idea how they got there really...

[mrk1]

Originally Posted by mhiscott

That is true... The exhaust housing I'll need will cost ~ 500 CAD shipped is the thing. If I have issues with it, I'm down that much cash against the price of getting a newer unit. I'm sort of torn on what to do atm. I've e-mailed Garrett some pictures to see what they suggest. The bends to the turbine wheel are more extensive than the compressor wheel. No idea how they got there really...

ATP has them for $249 USD, is the conversion that bad?

[mhiscott]

$249 usd + $30 shipping = 391 CAD + brokerage ~ $50 + 13% tax. $498 cad shipped to my door.

[rosol16]

Originally Posted by mhiscott

$249 usd + $30 shipping = 391 CAD + brokerage ~ $50 + 13% tax. $498 cad shipped to my door.

Or you ship it to one of us US members and then we ship it to you so you don't have to pay tax and brokerage. Or is that not a way around it? If so I'd be willing to do so for you provide you just pay for it all from your end