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Old 04-11-2007, 01:35 AM   #1
Thermal
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Garrett T28 BB

Any good?
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Old 04-11-2007, 03:04 AM   #2
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For what car?
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Old 04-11-2007, 09:43 AM   #3
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For a 325i
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Old 04-11-2007, 10:24 AM   #4
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a good size for a 325, should have a quick spool and keep pulling to a moderate power level.
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Old 04-11-2007, 12:17 PM   #5
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looking at the compressor map it looks too small, even with just 8psi it goes off the map into the <65ish% efficiency zone.

I'd get a GT30R instead, thats what I'm goin with. Its more appropriately sized and capable of quite a bit more power for the future if you want it.

EDIT: I hope I'm looking at the right map, I'm guessing ur talking about a gt28r since u said T28r ball bearing, if I looked at the wrong map then I'm sorry my bad
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Old 04-11-2007, 01:02 PM   #6
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That's the same turbo they use for some of the Stage III A4 1.8T/2.0T kits. I personally think it's too small for a 325 as the T28BB is more ideal for 1.6-2.2L engines and is rated for 300hp (not sure if that's even whp).

From my understanding, you'e better off with a GT2871R or GT3071R. These turbos are good for roughly 340-360rwhp before they start becoming more inefficient. They will spool pretty quick as well as they'll most likely be used on a T2 flange. EDIT: But you do have the option to size it with a T3 flange which will allow give you the option to run it with an external wastegate and future turbo upgrades i.e. GT30R, GT35R, etc.

What is your power goal? Determining this will usually make it easier to determine the proper turbo sizing rather than picking a turbo and maxing it out, for instance, to find out how much whp you'll put down.

Is this going to be used with some kit or are you piecing a setup together?
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Old 04-11-2007, 01:11 PM   #7
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Quote:
Originally Posted by PedroBMW
looking at the compressor map it looks too small, even with just 8psi it goes off the map into the <65ish% efficiency zone.

I'd get a GT30R instead, thats what I'm goin with. Its more appropriately sized and capable of quite a bit more power for the future if you want it.

EDIT: I hope I'm looking at the right map, I'm guessing ur talking about a gt28r since u said T28r ball bearing, if I looked at the wrong map then I'm sorry my bad
Hey Pedro, there is such a thing as a T28BB:
http://72.14.205.104/search?q=cache:...lnk&cd=1&gl=ca

I too think the GT30R is a good choice, but as I said if he doesn't want to push more than 360whp, the turbos I suggested are a pretty good size for that kind of power vs. a GT30R which although has a higher flow capacity, will not be as responsive. But if cost is not a factor, I'd jump on the GT30R just for more flexibility down the road to increase power.
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Old 04-11-2007, 06:57 PM   #8
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however i agree with what you guys said, this guy hasnt given us any other information regarding well... anything. on a stock 325 the 28 will be fine, if you choose the right sizewheel, if he wants to do some engine work etc etc than his choices become greater.


edit-actually after looking at the compressor maps myself i think that the gt30 will be a better choice. it will be a bit laggy but will leave more room for improvement in the future.
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Old 04-11-2007, 09:27 PM   #9
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Quote:
Originally Posted by Furious
edit-actually after looking at the compressor maps myself i think that the gt30 will be a better choice. it will be a bit laggy but will leave more room for improvement in the future.
told ya, its off the map, even with low boost.

I wouldn't consider a GT30R on an e36 laggy, with the .82 a/r turbine I've read ppl seeing 12psi on an s52by 2800 rpms with it. There is a .63 a/r turbine available which I'm thats I'm plannin to get, not sure when full boost would be seen but using this other as a reference I'd say close to 2000 rpm for sure. I wouldn't call that laggy at all IMO. Either way I'll let you know how it goes in a few months

Also a GT30R is capable of up to like 500whp using the .82 ar, its a shchweet turbo for these motors.
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Old 04-11-2007, 10:13 PM   #10
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at 12psi its playing with fire a stock motor will pop in jsut a matter of time. the .82 is the best choice, i would not consider the 1.06 on a 325
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Old 04-11-2007, 11:52 PM   #11
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Quote:
Originally Posted by Furious
at 12psi its playing with fire a stock motor will pop in jsut a matter of time. the .82 is the best choice, i would not consider the 1.06 on a 325
I said .63 not 1.06

and this guy really hasn't described what hes lookin for with his build, he might be lowering the compression via a headgasket or pistons.
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Old 04-12-2007, 01:29 AM   #12
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Quote:
Originally Posted by PedroBMW
I said .63 not 1.06

and this guy really hasn't described what hes lookin for with his build, he might be lowering the compression via a headgasket or pistons.


no you missunderstood, i was looking at if from the 1.06 standpoint, it was my mistake.
but yes this guy hasnt described what he wants. so really this is all worthless dribble he migth as well get a turbonator
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Old 04-16-2007, 01:00 AM   #13
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Quote:
Originally Posted by Furious
no you missunderstood, i was looking at if from the 1.06 standpoint, it was my mistake.
but yes this guy hasnt described what he wants. so really this is all worthless dribble he migth as well get a turbonator
Turbonator FTW GB? lol
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Old 04-16-2007, 03:18 AM   #14
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i should sell mine that i got for free.
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