cablebandit

iTrader: (37)

gotta consider intercooler and piping restrictions as well *** exhaust. Everyones setup is a little different but with enuff ls1 cars with FI, you can make some generalizations.

2000 Tran Zam

iTrader: (2)

superchargers seem to be pretty linear regarding the way power increasese per rpm...

uncle ray

i think he meant linear as in horizontal, like a completely flat line.

thats what electric motors do. example: at 1 rpm they make peak torque, an dit doesnt drop off at all no matter how fast it spins (until it suffers heat soak of course)

superchargers ramp up boost with rpm, so you start with a low torque number and gain more power with more rpm.

nz12's

iTrader: (4)

uncle ray, uncle ray, uncle ray............you said in another post you knew nothing of this spray stuff we we're talking about, then you publish hp and torque numbers???? Sounds like we need to get together and see how she pulls against this "LOW BOOSTIN" turbo? I didn't know those bottles came from the factory????

Louie83

iTrader: (3)

Your friends need to take a physics lesson.

PSI = Pounds per square inch

Let's try and make an easy comparison. We are at sea level where the PSI is about 14.7. There is a penny on the ground and a frisbee. The air pressure on both of them is 14.7 pounds per square inch, but the frisbee has a lot more square inches than the penny. So even though they have the same pressure per area, the frisbee has a lot more area, so there is a lot more total air pressure on the frisbee than the penny.

Same thing with engines. You have a 1 liter engine and a 6 liter engine, both with an extra 1 pound per square inch of pressure shoved in them. The total amount of air shoved in the 6 liter engine is much greater than the total amount of air shoved in the 1 liter engine, and therefore the total power increase will be much greater.

uncle ray

yeah... me either! it must be a wednesday car!!!
once i get the tune dialed in ill come out and see if i cant destroy something new on the car!!!

boostinsteve

You just cannot say that you will make a certain amount of power for a certain amount of boost. One turbo might give you 10hp per pound of boost while another will give you 20hp. Boost is simply the restriction to flow. That is what a flow differential is. Power comes from flow, and some turbos flow more than others. That is why there are compressor maps, so that you can see how much boost you need to make to get a certain amount of flow (power) and at what efficiency. Same thing can be said about a supercharger. And, one system can make a lot more power than the same setup on another car, there are just too many variables (tune, exhaust backpressure, intercooler and associated piping, condition of motor, just too many to list). In the end, it starts with how much power the engine made to begin with, and the turbo and the specifics that are picked to go a long with it.

black blur

I think the number your friends were trying to give is 7% gain for every pound of boost. This is true because your n/a engine is basically running off the 14.7 psi atmospheric pressure, assuming you are at sea level. If you add 1 pound of pressure you are basically running off 15.7(14.7 atmospheric and 1 boost). This means you will move more air through your engine which we all know means more power. THEORETICALLY you can calculate this increase in power to be 15.7/14.7 minus 1 which is about .07 or 7%. The problem with all these calulations is that they don't take into acount backpressure(if its turbocharged) or the hp it steals from the crank(if its supercharged). Also the increase in temperature from compressing the air(can be minized by intercooler) and decrease in the air flow efficiency (due to more air being pushed through), along with many other factors.

What all that means is 7% per pound of boost is what you gain before you start subtrating all the other factors.

red beast

I concur with the other members on this board....your friends are stupid and you need new ones....

KissMySSo1

iTrader: (2)

Every motor is diffrent. My motor will make less then 400rwhp on motor alone. Yet it makes over 800rwhp with just 10lbs of boost

Drewstein

I picked up 70rwhp with 2psi in 100deg weather so I would say they're full of ****.

LittleRedZ

iTrader: (5)

i gain roughly 25rwhp pre pound of boost