For I don't want to bud in anyone others thread.
I must be missing something bold, but if stock 310cc @ 90% duty and 10.5 afr give it stock 210-220 whp , how come ppl "maxin out" 1000cc for 500whp ? at 7 afr that is?

Thanks

 

7 AFR? what?

Because compressed air, right? Is that what you're asking?

The amount of fuel required to 'detonate' a compressed air charge is significantly greater than naturally aspirated applications (the 220whp figure you quoted)

My apologies if I've misinterpreted your question...

 

NA engine draws 18 lbs/min of air. I see people make 500whp at ~ 20psi boost (=42 lbs of air)

4*1000cc*100%/10.5/60 = 6.3 lbs of fuel/min (when "maxed out")

=> 7 arf

 

People making 500whp or moretypically run e85.

E85 get 30% worst fuel economy.

For example 1000cc injectors on stock fuel pressure max out at about. 600-650whp on gas like 91/93 octane, 100octane, c16,q16 race gas. This is considered gas

On e85 1000cc injectors max out at about 450-500whp.

I also average 20mpg on 91 octane but only average 13-14mpg on e85.