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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 07-08-2007, 09:27 PM   #1
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Default Garrett T25

S/N HJ16831W
P/N 465183-0008

T25 ar48 what can I expect from this turbine, how much boost can it handle and whot power levels?
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Old 07-08-2007, 11:47 PM   #2
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measure the inducer and exducer so I can the trim. But typically a t25 isn't going to get you more than 200-220rwhp.
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Old 07-09-2007, 09:38 AM   #3
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If you do not have the wheel size offhand, another useful bit of info would be what application it came from (DSM, Nissan)
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Old 07-09-2007, 10:08 AM   #4
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when i looked up that part number it looked like it was off a 90-98 Saab 9000 2.3L
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Old 07-09-2007, 12:46 PM   #5
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I think dets it, can I run something near 22psi on It with forged internals?
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Old 07-09-2007, 12:56 PM   #6
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it probably can't support 22psi (odd number)

can yuou provide any more information? the turbine A/R? can you measure the compressor wheel's inducer and exducer?

from my little bit of research, saab used the 55 trim compressor wheel:



you can see the max the compressor can flow is 20 lb/min, which is equilvant to 190-200BHP. (20 x 11.5 x .00916)

the max psi is can run at is 2.075PR or 16psi (2.075 X 14.7 - 14.7)
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Old 07-09-2007, 01:01 PM   #7
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maybe but if it is as small as i think running massive boost is not going to get you alot of power. most t25's wont go past 250whp at best and most t28's wont go past 300 whp. If i remember correctly you are making some decent power with your tsi setup are you not?
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Old 07-09-2007, 01:07 PM   #8
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MSQ is olmost done but head gasket blow and I need to replace it, maybe I can get good dill on carrilo con rods and wiseco pistons and with this setap 15psi seems poor, not redy to get a new turbo soon maby next year...
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Old 07-09-2007, 01:12 PM   #9
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what do you think of a high raving engine with a small turbo, do I need to change just walve springs to get to 8500-9000rpm?
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Old 07-09-2007, 01:14 PM   #10
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Yes valve springs and cams our stock cams wont flow very well at that RPM. Wait arent you solid lifter? that helps alot toda has stuff for you to run high revs
man you have been here a long time and have very little posts. I suggest posting will help your english and inturn will help us help you. just look at what it has done for a backwoods Kentucky boy. :gay: GL davor.
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Old 07-09-2007, 01:33 PM   #11
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LOL, I hawe hidraulic lifters from a GTX but can switch beck to solid I had before... will check for thet ****
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Old 07-09-2007, 03:04 PM   #12
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it would be a good turbo if you are say only need 17 lb/min at 9000RPM
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Old 07-09-2007, 05:33 PM   #13
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Quote:
Originally Posted by davor View Post
what do you think of a high raving engine with a small turbo, do I need to change just walve springs to get to 8500-9000rpm?
the higher the engine revs the more the turbo has to flow... reving higher will require a larger turbo.
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Old 07-09-2007, 06:51 PM   #14
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ok, then T28 is the way to go for 250rwhp before geting a 6speed treny...
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Old 07-09-2007, 10:25 PM   #15
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yeah, I'd look into something that can flow like the 2871
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Old 07-09-2007, 11:42 PM   #16
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I made 200rwhp at 13psi on a .48/.49 with a **** tune, so the turbo will easily do 220-230 on 13psi. If you intend to reliably rev to 8500rpm, you're going to need valve springs, rods, and oil pump gears.
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Old 07-10-2007, 08:24 AM   #17
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I hawe GTX rods, and rew to 8500 wos yust an idea... what do you think of T28 exhoust 0.64 air 0.6 for a 1.6 engine?
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Old 07-10-2007, 08:42 AM   #18
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Quote:
Originally Posted by davor View Post
I have GTX rods, and reving to 8500 was just an idea... what do you think of T28 exhaust 0.64 ar 60 for a 1.6 engine?
Might work how many PS are we talking. isnt that like a 2871 disco potato?
BTW for those who are more familiar with garret turbo's i put the qoute as it read's for me. dunno if i captured what davor was intending though.
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Old 07-10-2007, 08:56 AM   #19
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wont a turbo with fast spool thet is capable for 300rwhp
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Old 07-10-2007, 09:06 AM   #20
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then a gt28 is the deal unless you want to convert to all mitsubishi then a 16g would do it as well.
the chart looks pretty good it has the head room and good effeciency
http://www.turbobygarrett.com/turbob...R_707160_5.htm
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