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turbo questions

914 Views 5 Replies 4 Participants Last post by  Dakta, 
L
how hard is it to change the turbo?
and how much should i pay for a second hand one?
thanks.
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Dakta
Normally it's not a difficult job, removed one today though that was a bit of a battle as every nut and bolt I came across was seized :(

worst offender really is the downpipe, which isn't usually too bad to get off but if you can't raise the car high the amount of swing you can get with a suitably sized ratchet can be limited.
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G
If you are going to change the turbo, apparently the turbo from a 25 is better. Can you confirm Dakta??
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Dakta
It is indeed. There hasn't been any scientific testing of the theory (until now, that's why I've been removing one today, got a ZR unit to go in) but the compressor wheel on the later unit has a more desirable, better flowing trim.

One could suggest this is what (partially or in whole) makes the approx 10-15bhp gap between tuned sdi's and the later L series (135bhp max from an sdi, whereas we can tune the later ones up to about 150).



ZR - Stage 1 Hybrid - SDi (Left to right)

You can see the intermediate half-height fins on the rightmost compressor, they are much less visible on the leftmost unit.
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R
the 25/45/zr/zs turbo has a better compressor side from what i understand, but without increased fueling i cant see it making any difference bar cleaning up some of the smoke?

You will however require the downpipe from the later cars as the connection flange is different.
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Dakta
Yep you would.

Personally I wouldn't put too much effort into it, but if you're swapping the turbo anyway I'd have a gander for a later unit as it seems to be better.

You can also get away with the stock downpipe if you swap the exhaust housing for the turbo ;)
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