The .48 a/r t3 housing is physically larger than the t25/t28 .49 and .64 a/r housings.The t25 and t28 are basically the same housing.The t28 would have both better response and more top end than the Z18 turbo.You can fit something like the super60 trim wheel to the z18 turbo and back cut the turbine wheel to give it more flow but i still wouldnt recomend running anymore than 20psi as it goes outside of the comp efficiency and you'll need to feed it a diet of thrust bearings or fit a 360 deg thrust.By the time you did all that you'd be better of  buying a t28 and fitting the smaller .49 a/r housing machined to suit.

David Costello wrote:

 I realise they're a T3 housingthat's why I said T28 'sized' housing, not T28 housingI was told the exhaust side on the Z18 turbo was really small and comparable in size to either the T25 or T28 one, but I forget which is all Dave
----- Original Message -----
Sent: Wednesday, June 25, 2003 9:58 PM
Subject: Re: Z18ET T3
 They have a t3 exhaust housing.

David Costello wrote:

A T3 from a Z18ET is a small T3 compressor housing and a T25 'sized' exhaust housing right? or was it T28 'sized' exhaust housing? Dave
 

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