Balance Tubes On Exhaust Manifolds

[TwinTurboM3]

What is the advantage of using a balance tube for connecting the exhaust manifolds of a twin turbo system?

[mad082]

i don't know much about them but i would say that it is to make it so that both turbos are working the same. if you have 1 cylinder that is working a bit less that the others then the turbo on that cylinder will be spinning slower than the turbo on the other 3 cylinders.

that's my guess, but i admit i could be WAY off the mark with this one.

[Beer Baron]

generally used to elimate 'shuffling' and possible boost surge issue.

[mad082]

what is shuffling?

[TwinTurboM3]

yes, what is shuffling?

[infamous_t]

what is shuffling?

I would think 'shuffling' refers to pressure/airflow bouncing between the two turbos.

[R31Nismoid]

Compressor surge in other words.

I think Gav is using it on his GT-RS setup.

For the most part, you shouldnt need it.

[tacker]

ok dumb question to follow:

How would balance pipes on the exhaust help with turbo shuffle on the inlet side?

Seen N/A engines with balance pipes to help with the exhaust scavenger theory on L6 engines, but if that would work on a turbo engine i am not sure.

Ok second dumb question to follow:

Are the balance pipes before or after the turbo?

[GeeTR]

Shuffling occurs on the inlet side, but there’s only a turbocharger separating intake and exhaust 

Maybe having a balance pipe on the exhausts limits the chance of either turbo pushing more air then the other. It would kill the timing / separate pulses though. Noticed the new BMW twin turbo I6 doesn't have any exhaust balancing... and it just won international engine of the year.

More common, is the balance pipe on the intake side, between AFM and comp covers.