[FRS Justin]

Originally Posted by totopo

I don't think most people consider nitrous as naturally aspirated as the whole point is to bring more than atmospheric oxygen into the cylinder?

Just to do the math, to get 300hp out of a 2l engine... assuming you are an amazingly awesome (f1 grade) engineer and can get 210 PSI of BMEP out of the engine (haha), that would equate to a tq of 169 ft. lbs, so to get 300 brake hp you would need... 9300 rpm... hahaha... To get 300whp, with a loss of ~15% you would need... 10,700 rpm... hahaha... since peak hp is usually 15% less of peak tq you would realistically need to rev to 12,300 rpm...

Okay, so not possible on gasoline, so how about e85? I can't find any realistic numbers for e85... some paper claimed they got to 19 bar (275psi) of BMEP, but that's supercharged... In any event, to get down to a realistic level of ~9000 rpm, you would need a BMEP of 287 PSI or 19.8 bar (230 ft.lb of torque!!!)... don't think that's realistic...

Edit: In any event, it's kind of a moot point, the rods bear force, not power. So really, the limit isn't hp, the real limit IS the BMEP. So the reason NA hp doesn't always equate in terms of failures to FI HP is that FI boost TQ (BMEP) WAAAYYY higher than NA, and usually can't rev as high. So if the rods fail at 300 whp FI, you would need to see what their max tq is at, then that is the max tq you can hit on NA, which likely you'll never hit because it's na. In this respect nitrous can be seen more like FI, as it boosts your BMEP to rediculous levels.

Where did you find that formula? I've been looking for it in a online calculator. Thanks


Found it thanks again