TooMuch03
New member
I hate to state facts but a compound set will only be as powerful as the size of the low pressure turbo. A non VGT same size as a low pressure turbo on the compound running by it's self will produce more power than a compound set at W.O.T. A big VGT turbo will a lot of flow will give you the best of both, acting like a compound quick spooling and the power of a single non vgt turbo.
While this is true that compounds will only be as powerful as the lp turbo can support, it is also true of single turbos. They can only make as much power as the compressor can support. Furthermore, you can run a larger turbo in a compound setup than you can in a single set up. How many guys are running a single 80mm turbo? Very few if any, but many people with compounds are using at least that size for the lp turbo. The other advantage to compounds, or the procharger system, is that you can increase boost pressure above what either turbo is capable of on its own. At a point, based on the rpm and displacement of the engine, the only way to increase airflow is with higher boost psi.
Don't get hung up on the number, the turbo will be able to support 1200rwhp, but I didn't mean on fuel only. I have crunched the numbers and the numbers say that a 6.0 highest rwhp on fuel only is under 900rwhp if you can get enough air and fuel into it. The calculations were based off the cubic inch and set efficiency of the engine it's self.
Honestly, IMO, stating what a turbo can support on fuel and nitrous doesn't mean much. In theory, if you have enough spray and fuel, you can make 1200hp without a turbo at all. Also, FWIW, I just checked the highest HP fuel only PSD thread on here, Matt Moroni did 942rwhp with his 6.0, and that is what I found without doing any other digging.