I'm in the market for a manifold and a couple of the units I have looked at are not equal length. I am using a turbo with a divided housing.

I am concerned that two different runner lengths may cause back pressure to vary between the two rotors, in turn creating different AFRS and EGTs for each rotor. From what I understand the shape of the pipe (bends ect) is primarly what determines backpressure, so I don't expect the variation to be significant, but I'd still like proof.

Any thoughts/experiences?

 

I am interested in doing this as well, but XS told me my cast iron manifold would crack if I installed EGT probes.

 

Wow, that's crazy.
We've installed EGT probes and drilled through the stock pieces, and it's way thinner than the XS cast unit.


-Ted

 

Has anyone measured EGTs on each runner of an equal length exhaust manifold?

I have heard that a wide variance between front and rear EGTs on the 3rd gen is due to poor lower intake design.

I have seen "airflow balancer" in another member's must have mod list for 3rd gens and had a respected builder tell me of this phenomenon as well.

 

What's the problem with the lower intake manifold?

We're fighting a weird phenomena on a 13BT running an FD UIM, and I can't tune out these weird hesitations at around 2kRPM.  I keep swearing it's some weird intake resonance...


-Ted

 

What's the problem with the lower intake manifold?

We're fighting a weird phenomena on a 13BT running an FD UIM, and I can't tune out these weird hesitations at around 2kRPM.  I keep swearing it's some weird intake resonance...


-Ted