Can I swap to a Garett turbine housing?

dwdsm · 09-05-2008, 11:29 AM

Ok I'm going for more efficiency here so I was wondering if I could swap my Mitsu hotside with a garett. I have the SBR G-50 BB with the to4e compressor housing. SBR says it's a garett race 360 center section so I think it would be different then a 30R center section correct? While I'm at it I want to switch over to V-band if I can.

jusmx141 · 09-05-2008, 11:51 AM

It's absolutely possible....you'll just have to double-check your turbine wheel's specs to that of the Garrett's to find which housing will fit your wheel properly.

Your car hauls ass, by the way.

Burnett03 · 09-05-2008, 11:56 AM

Yes you can.. You need to figure out what exhaust wheel you have. I believe it's a Stage III which is a t31 76 trim. Aa buddy of mine has a brand new t31 76trim .68 garrett housing if you need one. You realize you need a new manifold and o2 housing now i assume right?

dwdsm · 09-05-2008, 01:21 PM

Quote:

Originally Posted by Burnett03

Yes you can.. You need to figure out what exhaust wheel you have. I believe it's a Stage III which is a t31 76 trim. Aa buddy of mine has a brand new t31 76trim .68 garrett housing if you need one. You realize you need a new manifold and o2 housing now i assume right?

yes I know.. I need a little more timing and I figure It's worth the flange, housing, and an O2.. See how much your buddy would want for it and if he has paypal to make it easy. I'll call garett to see if they have an all V-band hot side. here are the specs on the turbo from SBR.

Compressor Wheel Diameter 54mm
Compressor Wheel Inducer - 2.123
Compressor Wheel Exducer 3.000
Wheel Trim 50 Trim
Compressor Cover Inlet 3
Outlet Size 2
Bearing System Garrett Race 360 Center Section
Turbine Wheel Style - T31 (Stage III)
Turbine Wheel Inducer 2.559"
Turbine Wheel Exducer 2.229"
Turbine Wheel Trim - 76

I still wonder if it would be worth it but I'm happy with my car and just want to tweak it here and there.

dwdsm · 09-05-2008, 01:34 PM

Quote:

Originally Posted by jusmx141

It's absolutely possible....you'll just have to double-check your turbine wheel's specs to that of the Garrett's to find which housing will fit your wheel properly.

Your car hauls ass, by the way.

hey thanks! I drove like shit Wed at the track. was that you there? I can't find it here that's why I'm a little lost. TurboByGarrett.com - Turbochargers

Burnett03 · 09-05-2008, 01:45 PM

I've done a lot of research on this already.. The housing he has will 100% fit and work.. It doesn't however have a vband flange, it's a 4bolt outlet.. His email is domesticracing55@aol.com Tell him Ryan sent you. He has paypal. You can weld on a vband to it.

jusmx141 · 09-05-2008, 01:47 PM

I'm normally there every wednesday....my buddy runs a dark green '95 TSi AWD. Neither of my cars are done yet; although I'm finally caught up on work so it's time to pull the FWD back into the shop. It needs the least amount of work done, so I'd like to get it making passes down the track before the end of the year.

I believe all T31 wheels are the same spec, ball-bearing or not. If you scope out a couple different sites that offer Garrett-style turbos (PTE, Turbonetics, etc.) you'll find their wheels are the same spec as the one in your G50. Any T3 housing should fit as long as it's for the T31 wheel.

dwdsm · 09-05-2008, 01:47 PM

I e-mailed him. Thanks!
the only thing I don't know is what my current A/R is but I'll check when I get home.

dwdsm · 09-05-2008, 01:48 PM

Great info both of you thanks!

1992awdlaser · 09-05-2008, 03:00 PM

T31 Exhaust housing for StageIII (76 trim) turbine wheel: atpturbo.com

Convert it to v-band with this if you want. V-Band Adapter Module, Smaller 4 bolt (T31) 2.5" to 3" V-Band: atpturbo.com

dwdsm · 09-07-2008, 07:45 AM

Before I take the plunge, do you guys think this will help spool, and increase efficiency or am I wasting my time?

1992awdlaser · 09-07-2008, 07:50 AM

I doubt there will be any difference in spool at all. It will be capable of a little more power though. It will also make it so you have less chance of knocking since it isn't as restrictive.

dwdsm · 09-07-2008, 12:32 PM

I could use a little more timing and I figured a little more across the board would help spool slightly.

Burnett03 · 09-07-2008, 12:57 PM

Bigger housings spool a bit slower but make more topend because they are less restrictive.

delta448 · 09-07-2008, 01:27 PM

Be sure to post up the results you see after you do the switchover. I'm sure I'm not the only one who'd love to see what exactly the difference really amounts to.

dwdsm · 09-07-2008, 07:12 PM

Quote:

Originally Posted by Burnett03

Bigger housings spool a bit slower but make more topend because they are less restrictive.

If the a/r is the same wouldn't the housing flow the same? I figured the volute would be the only difference. A garrett volute is way more efficient then a mitsu half volute.

jusmx141 · 09-08-2008, 10:39 AM

The a/r greatly effects how the turbo spools as well as it's flow characteristic.

Garrett has a good writeup to help describe a/r:

"Turbine A/R - Turbine performance is greatly affected by changing the A/R of the housing, as it is used to adjust the flow capacity of the turbine. Using a smaller A/R will increase the exhaust gas velocity into the turbine wheel. This provides increased turbine power at lower engine speeds, resulting in a quicker boost rise. However, a small A/R also causes the flow to enter the wheel more tangentially, which reduces the ultimate flow capacity of the turbine wheel. This will tend to increase exhaust backpressure and hence reduce the engine's ability to "breathe" effectively at high RPM, adversely affecting peak engine power.

Conversely, using a larger A/R will lower exhaust gas velocity, and delay boost rise. The flow in a larger A/R housing enters the wheel in a more radial fashion, increasing the wheel's effective flow capacity, resulting in lower backpressure and better power at higher engine speeds.

When deciding between A/R options, be realistic with the intended vehicle use and use the A/R to bias the performance toward the desired powerband characteristic.

Here's a simplistic look at comparing turbine housing geometry with different applications. By comparing different turbine housing A/R, it is often possible to determine the intended use of the system.

Imagine two 3.5L engines both using GT30R turbochargers. The only difference between the two engines is a different turbine housing A/R; otherwise the two engines are identical:
1. Engine #1 has turbine housing with an A/R of 0.63
2. Engine #2 has a turbine housing with an A/R of 1.06.

What can we infer about the intended use and the turbocharger matching for each engine?

Engine#1: This engine is using a smaller A/R turbine housing (0.63) thus biased more towards low-end torque and optimal boost response. Many would describe this as being more "fun" to drive on the street, as normal daily driving habits tend to favor transient response. However, at higher engine speeds, this smaller A/R housing will result in high backpressure, which can result in a loss of top end power. This type of engine performance is desirable for street applications where the low speed boost response and transient conditions are more important than top end power.

Engine #2: This engine is using a larger A/R turbine housing (1.06) and is biased towards peak horsepower, while sacrificing transient response and torque at very low engine speeds. The larger A/R turbine housing will continue to minimize backpressure at high rpm, to the benefit of engine peak power. On the other hand, this will also raise the engine speed at which the turbo can provide boost, increasing time to boost. The performance of Engine #2 is more desirable for racing applications than Engine #1 where the engine will be operating at high engine speeds most of the time."

I wouldn't choose a housing with too big of an a/r at the risk of adding too much lag....unless, of course, you used Nitrous or had a 2.4 stroker.

Boosted98gsx · 09-08-2008, 10:47 AM

you're going to see more of a benefit dumping some race gas in that thing and upping the boost to 28-30psi than changing the manifold / turbine housing of the turbo. You're on the frontside of it's boost / airflow graph.

dwdsm · 09-08-2008, 01:17 PM

Quote:

Originally Posted by Boosted98gsx

you're going to see more of a benefit dumping some race gas in that thing and upping the boost to 28-30psi than changing the manifold / turbine housing of the turbo. You're on the frontside of it's boost / airflow graph.

Your right but I want to squeak out the best pump gas car I can. If I did anything I'd do meth injection.. I don't know I'll think about it would the little timing and possible higher air/fuel be worth the 185 bucks for the housing? I should of just went with the FP3052 in the first place and I wouldn't have this problem.