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Go Back   SR20 Forum > What's New > Technical Information Library > Turbo Guides



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Old 11-12-2004, 05:08 PM   #1 (permalink)
TUNED200
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HOW TO: Hybrid T25 to T28

........
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Last edited by TUNED200 : 11-26-2006 at 05:46 PM.
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Old 11-13-2004, 12:01 PM   #2 (permalink)
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Quote:
Originally Posted by Rob
awesome write up..should be a sticky
Thanks. Andreas Miko told me of this set up, and i believe with a good clutch and 3" turbo back, my old car would have ran 12.3-12.5 @ 113-116mph. The car was crazy fast.
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Old 11-14-2004, 03:11 PM   #3 (permalink)
chimmike
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i don't understand the point of this if you have a good t28 to use......
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Old 11-15-2004, 04:06 PM   #4 (permalink)
TUNED200
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Quote:
Originally Posted by chimmike
i don't understand the point of this if you have a good t28 to use......
A t28 will not fit on a BB manifold, so this is a cheaper way for BB people to upgrade to the T28's larger wheels without buying a new manifold, down pipe, intake pipe, etc.
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Old 11-15-2004, 04:41 PM   #5 (permalink)
trinispeed
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humm interested so how does it compare to an actual T28 is the power compariable between the t28 and the hybrid T25/T28. Which one spools faster and has more pull and all the other questions that come up when doing such a comparison.

trini
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Old 11-15-2004, 04:54 PM   #6 (permalink)
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Quote:
Originally Posted by trinispeed
humm interested so how does it compare to an actual T28 is the power compariable between the t28 and the hybrid T25/T28. Which one spools faster and has more pull and all the other questions that come up when doing such a comparison.

trini
To be honest, i have no clue on how well a BB DET with T28.5 pulls. Mine pulled hard, alot harder than the 12.7 1/4 mile time showed. A true T28 will be a better option, but with the extra cost, the hybrid set up is good, With a boost controller, it doesnt have mush more lag than a t25. I never had the wastegate set by a pro, I just eyeballed it and used a boost controller to dial it in. If i would have had it set, it would probley spool more like a T25. It still spools fast and makes power to what I felt like was 7K+ rpms. It didnt fall off like the T25 did.


I no longer own the car.
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Old 11-15-2004, 10:49 PM   #7 (permalink)
trinispeed
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any more comment on the comaprison btw T28 and a T25/T28 hybrid.

Time to clear the air


trini
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Old 11-15-2004, 11:41 PM   #8 (permalink)
sr20det808
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if i have a manual boost controller set at 11 psi with a t25, and say i were to do this swap... would it still be set at 11 psi after everything is put back together? also, could the 370's handle 11 psi on this setup?
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Old 11-16-2004, 02:10 AM   #9 (permalink)
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I am not sure at 3 bar, but at 4 par fuel pressure it would work for sure.

later,Jon
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Old 11-16-2004, 05:24 AM   #10 (permalink)
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Did youhappen to the the amount of clearance allowed between the wheel and the compressor housing?
-Josh
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Old 11-16-2004, 09:33 AM   #11 (permalink)
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Quote:
Originally Posted by TUNED200
To be honest, i have no clue on how well a BB DET with T28.5 pulls. Mine pulled hard, alot harder than the 12.7 1/4 mile time showed. A true T28 will be a better option, but with the extra cost, the hybrid set up is good, With a boost controller, it doesnt have mush more lag than a t25. I never had the wastegate set by a pro, I just eyeballed it and used a boost controller to dial it in. If i would have had it set, it would probley spool more like a T25. It still spools fast and makes power to what I felt like was 7K+ rpms. It didnt fall off like the T25 did.


I no longer own the car.
Did you have any other mods on your car that could possibly make it 12.7? I'm thinking of doing this so I save money. Ever get it dynoed to see how many WPH it was running? And one last question.. what did you run the 1/4 mile with the T25? Just want to see the difference.
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Old 11-16-2004, 04:39 PM   #12 (permalink)
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so the only thing from the T25 you use is the compressor side (milled out) and the wastegate, I should do this this winter and have a little upgrade for spring
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Old 11-16-2004, 06:38 PM   #13 (permalink)
vSpeX_07
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the car sure is fast cause i bought the car from tuned200! i have it set 11psi on low and 14psi on high on a dual mbc. it boost right after 3k and bam it hauls. good setup and i always get complement from the dsm guys how this thing is a beast!
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Old 11-18-2004, 09:40 PM   #14 (permalink)
TUNED200
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Quote:
Originally Posted by Egg_Sauce01
Did you have any other mods on your car that could possibly make it 12.7? I'm thinking of doing this so I save money. Ever get it dynoed to see how many WPH it was running? And one last question.. what did you run the 1/4 mile with the T25? Just want to see the difference.
It had S3's. but the car was fast without them. I would have bet money the car would have went 12.3-12.4 in the 1/4 with a stiff enough clutch.
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Old 11-20-2004, 08:38 AM   #15 (permalink)
TUNED200
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Quote:
Originally Posted by TUNED200
It had S3's. but the car was fast without them. I would have bet money the car would have went 12.3-12.4 in the 1/4 with a stiff enough clutch.
It had S3's, as well as 4Bar 370's with a miko bored maf.
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Old 11-24-2004, 09:12 AM   #16 (permalink)
trinispeed
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ok now i am going this route, i have decided. Now do i need a perfectly good t28 or can i use one with busted seals?

Also where do i send this to be done and how much am i looking at to complete this hybrid.

trini
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Old 11-24-2004, 03:08 PM   #17 (permalink)
Tomcat5678
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I don't think you really need a new T28, you could just rebuilt the one you have.
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Old 11-27-2004, 12:26 PM   #18 (permalink)
TUNED200
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Quote:
Originally Posted by Illicon2003
I second that
Its called reading. If you know much, you would know that a T28 WILL NOT fit on a bluebird manifold. The hybrid T28 will. If you run a true T28 with GTIR manifold, you will need a new downpipe as well. This is a option to upgrade to a T28 without changing the manifold and downpipe and intercooler pipes.

Last edited by TUNED200 : 11-27-2004 at 12:28 PM.
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Old 11-27-2004, 12:28 PM   #19 (permalink)
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Quote:
Originally Posted by Tomcat5678
I don't think you really need a new T28, you could just rebuilt the one you have.
this is true. It does not require a new T28. Any GTIR T28 will work, but you do not want to use one until its been rebuilt or is in good working condition.
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Old 11-27-2004, 01:31 PM   #20 (permalink)
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I always thought it was bad to port out turbo housings due to the possibility to really screw up the turbo's effeincy.
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