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Old 12-07-2011, 03:47 PM   #376
turboge
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I'm looking to switch out of the GTX3076R w/ .82 to the GTX3576R w/ .63 in hopes that I'll see some better flow from 24-30psi and better low end response. Right now the turbo appears to be out of breathe at around 28psi and 510-525whp. I'm also curious how the response on the new turbine will be in both .63 and .82 configs.

I had the car back on the dyno last week in hopes to see how the turbo would perform in colder weather at 30psi vs warmer weather at 28psi and was a bit disappointed.

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Old 12-07-2011, 03:56 PM   #377
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Something is wrong. I just tuned a GTX 30R at 30 psi and its full on at 3600 to 3700 rpm.

The .63 on the 35r is a horrible idea. That turbo requires the larger .82 full high power/boost. The turbo you are looking for is the new GTX 30R with the GT35R hotside. It was released at Sema.

C
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Old 12-07-2011, 03:59 PM   #378
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Clark - That's the turbo I was looking at replacing this one with. I'm also on stock TGV's and Stock Exh manifolds with unported 2.0L heads. What configuration was the GTX30 you had full boost at 3600?
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Old 12-07-2011, 04:01 PM   #379
Clark Turner
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stock 2.5 heads with a sleeved motor/pistons/rods. You need to get the heads cut. You are leaving ALOT on the table.
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Old 12-07-2011, 04:08 PM   #380
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Quote:
Originally Posted by Clark Turner View Post
stock 2.5 heads with a sleeved motor/pistons/rods. You need to get the heads cut. You are leaving ALOT on the table.
I figured as much, if I ever pull the heads off again I'll likely replace them with 2.5L heads and be done with it. So much for chamber matching and a bowl blend being close to 2.5L flow lol
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Old 12-07-2011, 04:24 PM   #381
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The 2.0 head/2.5 motor is in my opinion the worst combination you could have. I would rather have a 2.0. I have never tuned one I liked and that includes my own. You will get some telling you they made XXX and there is no problem ect. In reality, they just do not realize what they are missing.

C
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Old 12-07-2011, 04:55 PM   #382
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Turboge, Im really impressed you are able to maintain 30psi to redline. Are you jacking up the ebc duty cycle with rpm?
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Old 12-07-2011, 06:20 PM   #383
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Quote:
Originally Posted by Muckman View Post
Turboge, Im really impressed you are able to maintain 30psi to redline. Are you jacking up the ebc duty cycle with rpm?
Not at all, I'm using a .8bar spring in the WG and only running around 40% duty cycle flat to hit 30psi. This is on a grimmspeed EBCS with 1/4" nipples and vacuum lines.
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Old 09-29-2012, 10:23 AM   #384
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Quote:
Originally Posted by Clark Turner View Post
stock 2.5 heads with a sleeved motor/pistons/rods. You need to get the heads cut. You are leaving ALOT on the table.
Well, that's pretty good news for me. Is that an .82 hotside on the GTX3071? I am currently working on a GTX3071 .63 build w/ rotated intake mani/v-mount --- shooting for super fast spool. I know it will die off later on in the power band but I won't be in that region for too long. I can't wait to see how quick she spools
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Old 11-09-2012, 06:59 PM   #385
Irv Weissmanhowerton
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looking for a comparison between the gt3076 .82 vs the gtx3576 .82, vs gtx3076 .82
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Old 11-14-2012, 02:55 AM   #386
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Question to Jeff

I understand that gtx3076 .82 spool quicker than gtx3582 .63 and made same power up to 30psi but will the gtx3582 .63 perform better ( than gtx3076 .82 ) on

- bigger engines
- up to 35psi
- rev limiter 7000 approx

thanks in advance
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Old 11-14-2012, 10:12 AM   #387
Clark Turner
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.63 is way to small for any of the turbos for the 2.5 motor. The information is right on Garrets website for all to see. Anyone using the .63 is leaving serious power on the table.

C
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Old 11-15-2012, 09:04 AM   #388
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Quote:
Originally Posted by Clark Turner View Post
.63 is way to small for any of the turbos for the 2.5 motor. The information is right on Garrets website for all to see. Anyone using the .63 is leaving serious power on the table.

C
Thanks for replying me Clark
Most of the tuners also don't recommend .63 but why Garrets keep making them? for what cars ( engine cc ) ?

leaving serious power on the table? I thought we are talking about 30-40hp on top ( .63 vs .82 )
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Old 11-15-2012, 10:40 AM   #389
Clark Turner
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They make the .63 housing for lower flowing engines. The .63 is listed for 1.5 to 2.0 ltr engines. Or if you had two turbos on a V6 or V8 engine, You would want both turbos to have the small 63 housings.

C
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Old 11-15-2012, 11:45 AM   #390
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Quote:
Originally Posted by Clark Turner View Post
They make the .63 housing for lower flowing engines. The .63 is listed for 1.5 to 2.0 ltr engines. Or if you had two turbos on a V6 or V8 engine, You would want both turbos to have the small 63 housings.

C
Now that's interesting info
Why twin .63 works better than twin .82 on V6 and V8??
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Old 11-15-2012, 11:54 AM   #391
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A dissertation on turbine flow and dynamics is out of the scope of this perrin thread. I suggest you go to turbobygarrett.com and read the Turbo 101 information to get started. You can learn alot on that one website.

C
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Old 11-15-2012, 03:03 PM   #392
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Thanks for help Clark!
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Old 11-15-2012, 11:06 PM   #393
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Quote:
Originally Posted by FortMinor View Post
Now that's interesting info
Why twin .63 works better than twin .82 on V6 and V8??
With a 4-liter V motor, each turbo "sees" its own 2-liter motor.
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Old 11-16-2012, 07:01 AM   #394
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Quote:
Originally Posted by NSFW View Post
With a 4-liter V motor, each turbo "sees" its own 2-liter motor.
Is that means also that 4l V motor w/.82 turbos will have more lag than 2.5l car w/.82 turbo?
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Old 01-17-2013, 12:08 PM   #395
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Quote:
Originally Posted by Clark Turner View Post
The turbo you are looking for is the new GTX 30R with the GT35R hotside. It was released at Sema.

C

Any more info on this? Or are you talking about the gtx3576r?

Last edited by slowgenius; 01-17-2013 at 08:18 PM.
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Old 02-20-2013, 01:39 PM   #396
Irv Weissmanhowerton
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also want more info, all I could find was this :



in this thread on iwsti, page 14, but whole thread is about it, not sure of mods, fuel, or anything else, he has a few low boost plot above this one, pg 14

http://www.iwsti.com/forums/2-5-lite...stions-14.html

I would also like more info, not sure if its wrth swapping out my basically brand new 30r .82, for this, Id swap to v band on the down and uppipes to help the seal/ spool be as good as possible, & my block is now built for it, along with headwork cams and all I prob wont see many good gains with them on my 30r, 1700+ is alot without others being the guinea pig first
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Old 02-20-2013, 06:40 PM   #397
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Quote:
Originally Posted by Irv Weissmanhowerton View Post
also want more info, all I could find was this :



in this thread on iwsti, page 14, but whole thread is about it, not sure of mods, fuel, or anything else, he has a few low boost plot above this one, pg 14

http://www.iwsti.com/forums/2-5-lite...stions-14.html

I would also like more info, not sure if its wrth swapping out my basically brand new 30r .82, for this, Id swap to v band on the down and uppipes to help the seal/ spool be as good as possible, & my block is now built for it, along with headwork cams and all I prob wont see many good gains with them on my 30r, 1700+ is alot without others being the guinea pig first
Just bought a GTX3576. It will be tuned on a 06 sti within the next 2 months if you can wait that long.
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Old 02-20-2013, 07:14 PM   #398
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My prediction is 35r performance. 35r boost threshold and 35r power. The compressor maps look similar basically the same although the gtx30r wheel has to spin faster to produce the same results because it's smaller. So it may be that it actually lags slightly more on the 35r turbine than a 35r compressor would. Personally I'm going to run an HTA 3582 because they seem to have lower boost threshold than a normal 35r and make the same power.
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Old 05-15-2013, 04:45 AM   #399
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Quote:
Originally Posted by kakarot09 View Post
My prediction is 35r performance. 35r boost threshold and 35r power. The compressor maps look similar basically the same although the gtx30r wheel has to spin faster to produce the same results because it's smaller. So it may be that it actually lags slightly more on the 35r turbine than a 35r compressor would. Personally I'm going to run an HTA 3582 because they seem to have lower boost threshold than a normal 35r and make the same power.
That sounds like a logical conclusion; however the same could be said about the gtx3071. I have both the 63 and 82 housings and can tell you the response is better than the standard 3076. I have a friend with an 82 a/r 3076 and we routinely drive one another's cars and he comments all the time. I don't know if its worth the extra money however as we are within 200 rpm spool of one another at full throttle. The results are repeatable though.. Nothing mind blowing. My car feels livelier to 5 psi though as in pulling away from a stop. It's hard to quantify.

there's an evom comparo that shows the 3576 to spool faster than the gtx3076 which doesn't quite make sense since the 3076 has the smaller turbine wheel. I would love to see an actual Subaru comparison. I think the performance gain would be greater on our cars though as we typically benefit from the larger turbines.

Just a few thoughts. I feel the 71mm wheel is a better match for 60mm turbine for our cars than the new 76mm wheel is. I wonder if the 3576 is the same.
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Old 05-15-2013, 10:25 AM   #400
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Quote:
Originally Posted by reid-o View Post
That sounds like a logical conclusion; however the same could be said about the gtx3071. I have both the 63 and 82 housings and can tell you the response is better than the standard 3076. I have a friend with an 82 a/r 3076 and we routinely drive one another's cars and he comments all the time. I don't know if its worth the extra money however as we are within 200 rpm spool of one another at full throttle. The results are repeatable though.. Nothing mind blowing. My car feels livelier to 5 psi though as in pulling away from a stop. It's hard to quantify.
It has to do with blade speed ratio (i.e. wheel size matching) and inertia. Have a read:
http://www.motoiq.com/magazine_artic...p-details.aspx
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