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Old 05-01-2009, 01:58 PM   #1
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Default Will this turbo work ok?

Hi,

I was thinking about using a T25 for my turbo on my 1.8 and I just thought of a cheap car to take it off. In the UK you get the Rover 220, 420, 620 and 820 all with the same 2.0 turbo engine, with the turbo being a T25. I have had a search and couldn't find any info on here, but I have found the specs for the wheels on a parts website. I don't know how to interpret the numbers though so if possible is anyone be able to tell me whether it has suitable specs?

Compressor Wheel, Garrett - TB2555

Many thanks.


Edit - Trying to find turbine wheel as we speak, also found out the A/R which is 0.49.

Last edited by saitrix; 05-01-2009 at 02:13 PM.
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Old 05-01-2009, 02:04 PM   #2
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If you really want to know...find and plot a compressor flow map.

Find the map, calculate what your flow rates are for 3000rpm and 7000rpm for a given pressure ratio(whatever you plan on running) and draw a straight line connecting those two points. If this line "goes through the center of the island" you're fine as long as the upper rpm point isn't against a surge line, in some really low efficiency, or a really high compressor wheel speed.
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Old 05-01-2009, 02:05 PM   #3
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you shouold be fine and that should spool on your car.
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Old 05-01-2009, 02:06 PM   #4
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start here if you really want to learn:

Compressor Flow Maps and Calculations
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Old 05-01-2009, 02:16 PM   #5
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gospeed81,

Thanks , seem to be struggling to find anymore info though. :( Will carry on looking.
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Old 05-01-2009, 02:18 PM   #6
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Yeah, I did a quick look, didn't find a whole lot.

If you can't find it, find something with the same trim numbers and turbine in a T25 (should be damn easy) and work off of that.
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Old 05-01-2009, 02:22 PM   #7
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Yeah, also what parts are the important bits to measure? I may know someone who has as broken one.
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Old 05-01-2009, 02:33 PM   #8
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It almost looks like a T2 in size...kinda small, but some of us still go fast with small turbos ;P

You would also want to measure the turbine wheel inducer and exducer.

Then look for a map with those wheel sizes in a T25 housing. Here's a start:

Turbo Size Comparison
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Old 05-01-2009, 02:59 PM   #9
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Come with me if you want to live.


Turbo Size, A/R and Trim
Post #1 and post #8 have good info and good links.
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Old 05-01-2009, 03:13 PM   #10
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Quote:
Originally Posted by sixshooter View Post
Come with me if you want to live.


Turbo Size, A/R and Trim
Post #1 and post #8 have good info and good links.
Damn Shooter; as usual, you not only post good pics but good info!

BTW, I owe you big time with the coolant reroute info!
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Old 05-01-2009, 03:17 PM   #11
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Quote:
Originally Posted by sixshooter View Post
Come with me if you want to live.


Turbo Size, A/R and Trim
Post #1 and post #8 have good info and good links.
Awesome, thanks for that!
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Old 05-01-2009, 04:32 PM   #12
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holy ****...finally found it

http://www.not2fast.com/turbo/maps/t25_55_saab.gif

Now follow sixshooters instructions and get some PR plots on there, see what you can run, and if it breaths all the way to redline.
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Old 05-02-2009, 05:41 AM   #13
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Woah did not expect to find that. Is the T025 = TB25? Sorry I am not brilliant with the code numbers. I will do that later today and see how it is.
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Old 05-05-2009, 09:14 PM   #14
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Looks like it cannot flow enough for my engine that turbo. Was worth a try.
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