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Message: [QUOTE="wetnsloppy4x, post: 238982, member: 395"] I can't explain the math involved to come up with the answer you are looking for El. What I can tell you is to start with a horsepower goal. From there you can calculate the air mass is needed to reach that horsepower goal. That's the easy part. From there you need to figure out how much fuel you need to make use of that air at an acceptable A/F ratio. That's where I think the math gets a little trickier. Check out this link from Garretts website--->[url]http://www.turbobygarrett.com/turbobygarrett/mass_flow_rate[/url] It will give you an idea how the air requirements are calculated. It talks about gas engines but the basics are similar. If you poke around I think there might be some info on how to factor in fuel as well. I don't have time to dig for it right now but I think it might be there somewhere. [/QUOTE]

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