I have the turbo off an RB25 on the ca18 in my 1200 or at least i thought i did. Have pulled it apart to put new seals in it and have found that it is a ball bearing turbo and it is perhaps bigger than i thought. It makes the original t25 turbo off the ca look minature. The funny thing is the bigger turbo starts boosting at about 2400 and has full boost at 2800 to redline. Any ideas where i could get the specks and model number for this turbo. And the exhaust flange is six stud instead of the usual 5.

The RB25's have a T3 sized roller bearing turbo, with a ceramic back wheel as for specs you'll have to wait till i get home and i'll check.

A photo would resolve the issue. It's probably a GT28 of an S14-JDM or S15 Silvia.

If it's on the standard manifold (with no mounting modifications), then it's a T25 series flange. It can't be a RB25 Turbo.

Chris

Even model numbers off the plate weill help.