Well i went FI .........

[Goinfasterthanu]

Well I'm running 10.5:1 pistons with Ferrea flat face valves so my compression is between 10.5-11 and I'm running tons of nitrous on 93 octane with no problems. It's not boost but it's still FI.

Well i have to step in here... Nitrous is fine with hi compression... All hi compression car with a good nitrous setup will own on a drag strip!! Boost is fine with hi compression but the further up in compression goes the more likely it will det... You can keep it in check with good tuning .. Now nitrous will yeild 50 hp on 10:5:1 or 8:5:1 on the same shot , it isnt effected{sp?}like boost is by compression..... Its also not FI kevin... there is no forced air...hehe

[nash8]

Nitrous is kinda FI, but not really. You are forcing more air (actually nitrous oxide which is still a gas), but you don't really gain horsepower from the increase in cylinder pressure like you do with a turbo/SC, you gain the power because of the higher combustion ratio of N20.

So technically you are forcing more of something into the combustion chamber, it's just not air.

But you are totally right on the CR/nitrous thing. Since you arent really increasing the cylinder pressure by that much, running nitrous doesn't really cause detonation in high compression motors. You just gain more power by getting better combustion.

Where did all this talk of high compression ratio is better for boost start. I've never heard that before in my life. It just doesn't make sense to me whatsoever. More boost>higher compression ratio 100% of the time. If that's not true than there's a lot of evo, supra, dsm, sti and various other t/c vechicle owners that have been doing things totally wrong for a long time by lowering CR to run more boost.

[Goinfasterthanu]

Nitrous is kinda FI, but not really. You are forcing more air (actually nitrous oxide which is still a gas), but you don't really gain horsepower from the increase in cylinder pressure like you do with a turbo/SC, you gain the power because of the higher combustion ratio of N20.

So technically you are forcing more of something into the combustion chamber, it's just not air.

But you are totally right on the CR/nitrous thing. Since you arent really increasing the cylinder pressure by that much, running nitrous doesn't really cause detonation in high compression motors. You just gain more power by getting better combustion.

Where did all this talk of high compression ratio is better for boost start. I've never heard that before in my life. It just doesn't make sense to me whatsoever. More boost>higher compression ratio 100% of the time. If that's not true than there's a lot of evo, supra, dsm, sti and various other t/c vechicle owners that have been doing things totally wrong for a long time by lowering CR to run more boost.

I agree... I was just saying in the sense that nitrous wont bring you into even 1psi of boost.. But in a sense it is just wont ever bring you out of 0vac like true FI... All on how you look at it.....