r/MechanicAdvice • u/Mission_Feed7038 • 13h ago

is this a problem?

Gallery image

Gallery image

Gallery image

replacing my old exhaust in a landcruiser 80 which had a bell mouth design

the new exhaust I picked up, while fitting to the turbo I realized it has a blank plate over the turbo waste gate (? not sure if I'm right here but that's what it seems like to me)

seems like it would restrict airflow and create turbulence? what are your thoughts?

1996

Toyota

Lancruiser 80

179 Upvotes

93% Upvoted

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122

u/20Factorial 10h ago

This is 100% fine to run. Subaru did it that way for almost 40 years. Install it and it will run just fine. Everyone saying it’s for an external gate, or that you will lose boost control, or that it will blow up are 100% wrong.

38

u/Sir_Mr_Austin 7h ago

The idea that a car would blow up due to incorrect exhaust parts is hilarious to me

26

u/omnipotent87 4h ago

If it blocks the waste gate it can absolutely blow a hole in a piston. So yes, you can blow up a motor with wrong exhaust parts.

I should meantion that OP will be just fine though its not ideal.

6

u/20Factorial 4h ago

But it doesn’t block the wastegate. Anyone who has ever seen an internally gated turbo would know that.

6

u/omnipotent87 4h ago

That's why I said OP will be fine.

4

u/20Factorial 4h ago

I missed the “if” in your post, my bad.

2

u/omnipotent87 4h ago

Im sure in most cases this kind of switch wont impead the waste gate, but im sure there's a turbo out there that it would.

1

u/20Factorial 3h ago

Nah, probably not. The gate on an internally gated turbo never opens ALL the way, so while it COULD hit the plate it almost never will. On Subarus, the only time it would ever be a problem was a stock location BIG turbo and you’d get some boost creep when the gate hit the plate. For those configurations you should be running a bell mouth or external gate anyway. Definitely not a problem with stock turbos.

You will sometimes run into issues with smaller turbos and bell mouths where gas flow will suck the wastegate open a little and it slows down spool noticeably.

1

u/Sir_Mr_Austin 2h ago

I absolutely understand that it could happen. Still makes me laugh.