I think that's mostly due to the compressor efficiency which will affect temperature out which was assumed constant in the super ghetto PR * NA HP equation. Just use that to get a ball park idea of HP per Psi but compressor maps are the way to go but it sounded like reading compressor maps were beyond the scope of the OP.

 

Anyone asked what fuel (Pump vs E85) and ignition timing he's running?

 

Doesn't matter. All engines pretty much make the same power at the same boost pressure regardless of other variables. It's called dynamic linearity. You can't argue with science.

 

Took the words straight outa my head...........from yesterday

GET OUT OF MY HEAD CHARLESSSSSSSS

 

Here is an overlaid dyno plot of 2 different setups at 8psi. This is why you can't compare.



Exact same MAP, 50ft/lb difference.

 

That's like, your opinion, man. Post some numbers to back it up.

 

Can you explain this further? Or were you just joking.

Even the same car, same boost, same setup, makes drastically different power/torque with different ignition timing. I'll be running 16psi at 7000rpm from a c30-94 rotrex... are you saying I'll make 350whp regardless of my ignition timing, fueling, altitude? That doesn't seem right. Not trying to argue, just curious.

Thanks

 

 

It's more than just efficiency. Its bigger and moves more air. A gt40 will move way more air than a 2554. At the same psi. Even if they are both perfectly efficient.

 

 

 

I don't know how I ended up down the rabbit hole to this thread, but this picture needs to come back into the limelight.