Newbie Q's... Turbo differences?

[Aussie Oi]

Gday all.Ive tried searching here and reading through countless posts, but im very new to turbos so im struggling to make sense of much.

The story... (Feel free not to read this bit)A couple of mates and I recently purchased a ute fitted with a CA18DET for some off-road racing.

It was breaking down not long after spooling up, and we knew the turbo was tired, but took it for a run, then parked it.

Next day... Checked for fault codes, changed coil packs and fired it up, ran it for a little while and it started putting out the most impressive cloud of white smoke ive ever seen.

Started pulling shields and stuff off and found the air line which was meant to open the wastegate was broken...

That explained the breaking down once it cut fuel with too much boost.

Anyways, checked out the turbo and it was leaking oil into the exhaust... The impressive smoke problem.

My questions...

I cant even figure out what the hell this turbo is. I assume a T25 purely based on that seems to be what they had standard. Any easy ID ways?

Ive gathered a T25 or T28 is fine to bolt on to replace the old turbo. Are they all watercooled?

Is there any advantage to running a T28 on what is primarily a stock motor?

What is this AR number all about?The old turbo had AR48 stamped on it, and i had a look at another T25 which had AR80..?Whats better or worse or acceptable to run?

Are there any differences between T25's aside from some having a flange on the turbine inlet?

Any other helpful hints you could throw at me would be much appreciated too.

Cheers.

[Liquid_Neon]

white smoke? thats usually coolant bud.

bigger turbos wont have anything to do with white smoke or breaking up under boost.

A stock CA has a small T25, so your right about that.

[zombieslider]

the 48 was the stock t25 turbo, idk what the ar 80 came off of but its not a srt25 which is 60 which is what i would suggest replacing yours with itll bolt right up theres a couple explinations on here of how to do it. Heres a link to explian the a/r http://www.moddedmustangs.com/....html

oil burns a blue smoke f.y.i.

[float_6969]

IDK why, but oil smoke can look kinda white-ish when it comes out of the turbo like that. Don't ask me why, but it does it sometimes.

You have a stock CA turbo on there. I would try to source one from an SR20DET. They are a good replacement and make decent power. You'll actually be able to run LESS boost and make the same power as the turbo you have now, and very little change in lag. The stock turbo is infamous for being undersized.

[Aussie Oi]

Thanks for the replys guys.Interesting link zombieslider, that explains it well.

As for the white smoke ive found a bit of oil will burn blue, but a s*** load of oil will tend to burn white. This starts out with blue, then turns to white as it warms up more, so i think it is oil rather than coolant.

The other turbo i mentioned is off a redtop SR20DET apparently, but as i said has an AR of 80.Would you think this was too high to use? We probably need boost a bit lower in the revs rather than all up top.

[mbmbmb23]

Thanks for the replys guys.Interesting link zombieslider, that explains it well.

As for the white smoke ive found a bit of oil will burn blue, but a s*** load of oil will tend to burn white. This starts out with blue, then turns to white as it warms up more, so i think it is oil rather than coolant.

The other turbo i mentioned is off a redtop SR20DET apparently, but as i said has an AR of 80.Would you think this was too high to use? We probably need boost a bit lower in the revs rather than all up top.

.80 A/R is correct for the compressor side on an S13 SR turbo. The S14 SR has a .60 A/R, either will work for you and be an upgrade over stock.

[Aussie Oi]

Thanks mbmbmb23.

I might grab that .80 then and give it a whirl, and hopefully we dont need excessive rpm's to run it.

Cheers.

[float_6969]

Just make sure that is the compressor's AR, not the turbine's.