I am looking at a powerdyne supercharger (I know a lot of you are going to say to use a bell or any roots type charger) but i am looking at simplicity to install. unless you have experiance with both or know someone that has ran both i would like to hear pros and cans of both.

Is this going to increase power that I will notice? I am going to run the 5-6 psi in hopes that I can still run on 90 octane gas. Around here 90 octane is the cheapest so i really want to run as high of boost on that octane.

Will I have to convert to mass air? or will a chip work?

will a aftermarket intercooler thats mounts in front of the radiator going to give any noticible power increase?

I also dont want to have any hood clearance issues.

 

any of you know if a roots or screw type will fit under the hood of a 92 f-150 302?

 

There are three types of superchargers: Roots, twin-screw and centrifugal. The main difference is how they move air to the intake manifold of the engine. Roots and twin-screw superchargers use different types of meshing lobes, and a centrifugal supercharger uses an impeller, which draws air in. Although all of these designs provide a boost, they differ considerably in their efficiency.

The Roots superchargers are usually large and sit on top of the engine. They are popular in muscle cars and hot rods because they stick out of the hood of the car. However, they are the least efficient supercharger for two reasons: They add more weight to the vehicle and they move air in discrete bursts instead of in a smooth and continuous flow.

Twin-screw superchargers more efficient, but they cost more because the screw-type rotors require more precision in the manufacturing process. Some types of twin-screw superchargers sit above the engine like the Roots supercharger. They also make a lot of noise. The compressed air exiting the discharge outlet creates a whine or whistle that must be subdued with noise suppression techniques.

Centrifugal superchargers are the most efficient and the most common of all forced induction systems. They are small, lightweight and attach to the front of the engine instead of the top. They also make a distinctive whine as the engine revs up -- a quality that may turn heads out on the street.
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Anytime you add boost you have to get a dyno tune (in my opinion). Too many variables to just throw on a supercharger and run 90 octane gas without seeing all the facts (wide band O2, EGT and so on).

If you have speed density now I think you are going to need a mass air system. I don't think the speed density computer would be able to compenstate just for the massive change in air flow.

An aftermarket intercooler is a very good investment. They will give you a denser, cooler air charge which helps make power.

Hope it helps.

Supercharger info taken from http://auto.howstuffworks.com/supercharger.htm

Toohey

 

thanks for the info. I was planning on doing the Mass air conversion just waiting on a computer the wide band O2 would also by added. do you know if there is a big difference between a Centrifugal and screw type with where is makes its power in the rpm range? I have seen a lot of other post that say a Centrifugal doesnt give good low rpm power but a screw does?

 

I don't think there is a difference, boost is boost. I would look at it as 5psi is 5 psi no matter how you get it. But I'm not 100% sure.

 

There is a Very big difference were a cent blower and a screw blower make there power.
If you want good of the line power. you want a screw blower.
A cent blower will start making power over 3000 RPMs.
I would not recommend any cent blower for a truck,,,but that's me. I want my power and I want it NOW,,,lol.
My first blower set up was 5 psi and it called for 93 octane! I don't think you can run a blower on 90.Not a good idea!

 

Do you konw where i can find a chart that shows before blower HP and TQ curve and after blower HP and TQ curves. For both the cent and screw?

 

Here ya go.
If you look at my chart. You will see that my twin screw has a vary flat curve and it hits max HP very fast!And holds it on across the chart.
The cents will have a curve that starts out low but builds up in the higher rpm rang.

 

thanks that gives me some good info do you know if a bell will fit under the hood without any probs?

we are leaving for a week and will be talking to dad more about it so if i have any more questions i will post when i get back.

thanks

 

Most any kit will fit under your hood!
Whatever you do.Make sure the kit is intercooled!! Had a K B kit That was not intercooled and did not like it.Without an intercooler it made way to much heat!

My truck was faster with a intercooled little M90 kit at 5 psi then it was with a non intercooled KB at 8 psi on a built block with ported heads and high performance cams.

 

There are no positive displacement kits availble now for a 87-96 trucks (that I know of), unless you plan on building your own.