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

[Vteckidd]

Not bad numbers if its a straight LS motor. Thats about right power wise.

Your compression is too low, thats why the numbers are lower that normal, youll have to run more boost to get the same numbers as everyone else running 9.5:1

throw a thinner headgasket on it!

[Goinfasterthanu]

Not bad numbers if its a straight LS motor. Thats about right power wise.

Your compression is too low, thats why the numbers are lower that normal, youll have to run more boost to get the same numbers as everyone else running 9.5:1

throw a thinner headgasket on it!

Yea i wouldnt have made it so low but it is what it is.... Over all im happy with it and it WILL be running more boost soon... And yea theres no porting , cams or anything...... Anything you can think of thatll help it a lot.. I would like to drop the revhard a/c compatable mani.... Anyone know a way to get a filter on the turbo with this mani???

[2Fast4Radar]

Anyone know a way to get a filter on the turbo with this mani???

I would highly suggest trying to get a quality filter on the turbo. Over the years the Supra guys have shown what happens what you run with just a screen netting over the turbo - particulate from the air impacts the compressor wheel and causes pitting over time. I'd make it work somehow - if you're at the track making a few passes that's one thing, but driving it around on the roads all the time is something I wouldn't want to do with just a screen unless you just don't care about the turbo.

[2Fast4Radar]

Your compression is too low, thats why the numbers are lower that normal, youll have to run more boost to get the same numbers as everyone else running 9.5:1

throw a thinner headgasket on it!

8.5:1 is low for a turboed car? Are you serious?

I have 8:1 compression and the highest I would ever go would be 8.5:1. Detonation and knock suck!

[KevinT707]

8.5:1 is low for a turboed car? Are you serious?

I have 8:1 compression and the highest I would ever go would be 8.5:1. Detonation and knock suck!

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.

[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.....