Thread: 4BD1T Turbo Sizing and Performance Prediction.

Originally Posted by Judo

Let me know if this answers all your questions... Measured as exact as I could, but better not quote me down to the millimetre!

Overall length:




compressor in: 2" (altho strangely it measures to 55mm? My silicone hose that SQUEEZES over is definitely 2" tho).
compressor out: 2"

The adjustable actuator means you can take it apart and change the spring for a different rating. So depends at what pressure you are planning to set your waste gate, depends on which spring you want with it.

You can easily rotate the compressor housing where the actuator bolts on. It definitely won't work at "any" rotation though, as I know with the position I have rotated my compressor to, the actuator bracket no longer works. I think there is limited positions you can adjust it to. So depends on your configuration...

Justin, any chance you could put vernier across the widest part of the intake? I want to use my 3" cobra style bend so will need to get an adapter ring machined up to slide over the intake, which I think I will just glue in place. It will make the plumbing much easier for me. That way I should have all the parts sitting here ready, I hope.
Damien

Originally Posted by Vern

Justin, any chance you could put vernier across the widest part of the intake? I want to use my 3" cobra style bend so will need to get an adapter ring machined up to slide over the intake, which I think I will just glue in place. It will make the plumbing much easier for me. That way I should have all the parts sitting here ready, I hope. Damien

Ok, you want a more exact number of my 55mm?

would be good. would rather a loose fit than one that doesn't.

Just noticed this last night - should I be concerned...?

Originally Posted by Vern

would be good. would rather a loose fit than one that doesn't.

Measured it many times. Most times it was 56.0x with the largest being about 56.1mm although that was probably my inaccuracy. If you're glueing the piece over it, 56.1mm should fit and be pretty snug.

Edit: Depends how much room you want for glue, I guess another fraction couldn't hurt... you won't fit much glue in 0.05mm! Up to you.

Thanks justin. Should have all the bits togethor mid next week. Hopefully on and running that weekend😊

Originally Posted by isuzurover

Just noticed this last night - should I be concerned...?

Cracked wastegate seat? Yeah it's common. You'll be losing a bit of boost. Get a new housing and you'll be good for another hundred thousand km or so.

Originally Posted by Dougal

Cracked wastegate seat? Yeah it's common. You'll be losing a bit of boost. Get a new housing and you'll be good for another hundred thousand km or so.

Common in 4BD1T applications in general or just in the case of Isuzurover's particular turbo?