Really stepped in it now

The blow off valve is on the intake side of the turbo ... it limits the boost PSI to a set pressure. Keeps the engine head gaskets intact :) It is not going to be effected by the change in exhaust.



Anyway, you just changed the muffler right? The exhaust is still going to be restricted by the smallest pipe ID. In order to realize more power, along with a bit more turbo lag, The whole exhaust piping needs to be replaced with a larger ID pipe exhaust system ... right from the turbo's hot side (down pipe all the way back). Sans this, you really haven't change much right now.

Thanks for the info on the blow off valve. According to Banks, even a little at the end translates into some at the turbo. It may just be meet but, I could swear that the turbos are a little snappier.

[ame="https://www.youtube.com/watch?v=2tZYJHtXG9s"]https://www.youtube.com/watch?v=2tZYJHtXG9s[/ame]

I also email Banks to see if the muffler would need a new tune or any issues with the valve. They told me that it wouldn't need a tune and the new blow off valves are electronic so reducing the back pressure even a little would not affect it.
 
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I hope the difference between a blow-off valve and a turbo wastegate are clear to our viewers. A blowoff valve dumps excess pressure from the intake, and a wastegate allows exhaust gasses to bypass the turbine wheel to prevent overspeed of the turbo.
 
You could also state the WG function as a (computer controlled) boost regulator.

Yes. In 1984 with the release of the SVO Mustang, we very "simply" controlled boost with a premium fuel switch on the dash that modulated the signal to the wastegate. There were just two boost levels, with a slow and stupid knock control system —- by today's standards. I've said before that knock control was the keys to the spark ignition engine kingdom.


Tom H.
 
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