I have a mate with a garrett T3 turbo with a .61 exhaust after ratio which he no longer requires. I Was wondering if these turbos are well suited to the td42 engine, and also would it be worth getting the exhaust housing changed to .82 ratio if I purcahsed the turbo. Any comments would be greatly appreciated.
cheers
cuzza
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T3 suitability
Remember that the "T3" specification is merely a cartridge size - compressor / turbine housings and wheels can be just about any combination of the above.
T28 and T03 are roughly similar in cartridge size (the T28 being slightly larger) - the T28 is typically used on RB25's as used in the Skylines - but this does not mean it's suitable for a TD42.
the .61 A/R is a good start in calculating suitability for the application - but this is only half the picture; you still need compressor sizing in order to calculate potential and max flow based on your engine size & determine if it's right for your application.
T28 and T03 are roughly similar in cartridge size (the T28 being slightly larger) - the T28 is typically used on RB25's as used in the Skylines - but this does not mean it's suitable for a TD42.
the .61 A/R is a good start in calculating suitability for the application - but this is only half the picture; you still need compressor sizing in order to calculate potential and max flow based on your engine size & determine if it's right for your application.
If it's worth doing - it's worth doing to excess ...
I would suggest that this A/R is a bit small for a TD42 - although that's not to say it wouldn't WORK - anything will work ... just a matter of how well!
Really for a TD42 you should be aiming for something around the .55 --> .8 range A/R on the turbine to achieve a good all round boost performance - tuned more toward the top end (from 2000 onward) - the larger the A/R, the more heat & gas it takes to spool i.e. higher RPM's - then it needs to be matched with the correct compressor.
The relatively small A/R will probably give you very fast spool up at low revs, then will run out of go before peak torque is achieved (around the 2-3000 RPM).
Compressor for a TD42 - from memory is the T3 Super 60 trim compressor ideally?
There is a reasonably good site in terms of calculating compressor trim etc here:
http://www.turbominivan.com/tech/turbo201.htm
And it's in terms even I can understand!
Really for a TD42 you should be aiming for something around the .55 --> .8 range A/R on the turbine to achieve a good all round boost performance - tuned more toward the top end (from 2000 onward) - the larger the A/R, the more heat & gas it takes to spool i.e. higher RPM's - then it needs to be matched with the correct compressor.
The relatively small A/R will probably give you very fast spool up at low revs, then will run out of go before peak torque is achieved (around the 2-3000 RPM).
Compressor for a TD42 - from memory is the T3 Super 60 trim compressor ideally?
There is a reasonably good site in terms of calculating compressor trim etc here:
http://www.turbominivan.com/tech/turbo201.htm
And it's in terms even I can understand!
If it's worth doing - it's worth doing to excess ...
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