dfseidel

Okay guys, what is the best methodology for tuning twins, I'm kinda hoping for a flowchart approach if possible. Something anyway that could address total pressure vs cold pipe pressure vs drive pressure and where you want your system to be and how to get there. Probably asking too much, but, as they say, hope springs eternal. Thanks all!

doug60

The way I under stand it , if the total is 60.
The big one (cold pipe) should read 28 pounds. The small one making 32.
Its not working harded because the big one is force feeding it.
And thats were the compounding takes effect.

In other words the small turbo should be making about 4 pounds more than the big one.

Thats how it was explained to me.
Hope this helps. Feel free to correct or expand on it.

dfseidel

Okay so I'm aiming for a touch less than half from the larger turbo as well as a drive pressure ratio no more than 1:1 ... So I assume I'm adjusting the wastegate on the smaller turbo, if the smaller turbo is making too much boost, then you open the wastegate sooner? Does that mean you adjust the acuator arm longer or shorter?