Thread: 4BD1T Turbo Sizing and Performance Prediction.

Pretty sure it does, its all combined into one outlet unlike judo's which has two pipes going into one

Originally Posted by Vern

Bench test, do you think I have a pressure tester let alone a bike pump laying around.

Hook a hose up to your mig regulator. Controllable pressure source and gauge all in one

Steve

The Canadian with the same turbo on his 4BD1T in an auto 80 series cruiser is running 18psi and cool EGT. Getting to 100km/h in under 20 seconds.

He's got head gasket issues (aftermarket gaskets *shudder*) so won't be winding it up for a while.

Originally Posted by Dougal

That's a big red flag. It should be zero psi or very close to it with the wastegate open.
Is the lever free to move the flap open?

What does the wastegate open at on a bench test (use a bike or hand pump and pressure gauge).

Ok I disconnected it again, hitting 12 psi through the gears

Originally Posted by Vern

Ok I disconnected it again, hitting 12 psi through the gears

Oh and the waste gate turns 90degrees

I have a random question. What kind of muffler do you have? 3" exhaust right?

Originally Posted by Vern

Ok I disconnected it again, hitting 12 psi through the gears

Originally Posted by Vern

Oh and the waste gate turns 90degrees

This is weird. Mine has no boost with the wastegate open. But I also have a boost compensator so no boost means I get fuel suited to no boost. I can only pull 650C without the turbo which is just enough to maintain 100km/h at 2000rpm.

Is your 12psi at high rpm or under load cruising?

12psi going up theough the gears, 5psi cruising, 10psi under load at 100.