saitrix

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.

gospeed81

iTrader: (51)

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.

turbomclovin

you shouold be fine and that should spool on your car.

gospeed81

iTrader: (51)

start here if you really want to learn:

Compressor Flow Maps and Calculations

saitrix

gospeed81,

Thanks , seem to be struggling to find anymore info though. :( Will carry on looking.

gospeed81

iTrader: (51)

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.

saitrix

Yeah, also what parts are the important bits to measure? I may know someone who has as broken one.

gospeed81

iTrader: (51)

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

sixshooter

iTrader: (12)

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.

Rafa

iTrader: (22)

Damn Shooter; as usual, you not only post good pics but good info!

BTW, I owe you big time with the coolant reroute info!

saitrix

Awesome, thanks for that!

gospeed81

iTrader: (51)

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.

saitrix

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.

saitrix

Looks like it cannot flow enough for my engine that turbo. Was worth a try.