Thread: Turbo arrived in the mail

Exactly the same part # as the old one here in my spares box.
As for the exhaust, it sits over a neck which bolts to the exhaust manifold. But there must be other ways to acheive it.

Originally Posted by DeeJay

... how does the exhaust pipe match up to the flange ...

Here is a pic. The spigot (top right) fits inside the recces in the turbine outlet and the piston rings seal it up.

nice one. What is the hot side A/R?

Originally Posted by rar110

nice one. What is the hot side A/R?

0.89

Originally Posted by Dougal

0.89

I thought these motors had a turbo with an A/R of about .49 or something otherwise be too slow to spool up. Maybe not.

Originally Posted by rar110

I thought these motors had a turbo with an A/R of about .49 or something otherwise be too slow to spool up. Maybe not.

The high A/R is what may allow them to be free floating (no wastegate).

A smaller A/R will allow faster spool up, but require a wastegate.

[QUOTE=Dougal;1038167]0.89

Correctomonde.




Other numbers are.



Plus a .48 in the outlet neck.




David

Originally Posted by rar110

I thought these motors had a turbo with an A/R of about .49 or something otherwise be too slow to spool up. Maybe not.

The turbo I'm running is from a nissan bluebird CA18DET.
It has exactly the same compressor (outside of housing looks different, but same geometry and wheel) but a 0.49 A/R exhaust housing with a smaller turbine wheel and wastegate.

It's got more low end boost than I can use (17psi at 1400rpm makes it rumble). I'm currently getting a 0.64 A/R exhaust housing modified to fit. Just to see how it goes really. Maybe trade off some unusable low end for more mid range.

The mods are to make it fit the bolt pattern on the old IHI manifold. It needs the holes slotted by about 3mm. Once that's done the port matches up quite well.