[FATTEMUNK]

Originally Posted by Swagger

1. Try driving or riding in two cars that are PD & Centri with comparable power.
2. Decide how you like your power, do you want a initial power hit that flattens and holds thru the power range, then falls off a bit at the top. Or do you want a the feeling of making more and more power the faster you go. The surge of power as I call it.

In my opinion having time in both cars thats the feeling I get from them. Many will argue they are equal or comparable. I personally do not find that to be true, I find that they have very different styles. For my taste I am building a 416/F1A 6spd 1LE specifically for roll racing, Mexico runs and so on. I want the power in the mid and upper range, I want that linear surge that keeps building up. This is very much a personal preference. Get some rides and then make a choice bro. Each blower will get you there, ultimately the Centri cars make more power if you want the BIG numbers. But again take a ride in each before making a choice

Your build is one I'm keeping a very close eye on. It's very similar to what I am planning with the 416 and a big blower. Just trying to figure it out which one. I also think your idea is a great one. I'll def try to find some cars in the bay with both blowers and see what fits me. One of my problems with centri blowers is the whoosh sound when you are crusing and the bypass is open. Anyway to eliminate that? Don't mind it when I accelerate and let off but all the time it will get irritating. I don't know if I can wait till the end of june/July for the 2650 though. Procharger it might be.

[Swagger]

Originally Posted by FATTEMUNK

Your build is one I'm keeping a very close eye on. It's very similar to what I am planning with the 416 and a big blower. Just trying to figure it out which one. I also think your idea is a great one. I'll def try to find some cars in the bay with both blowers and see what fits me. One of my problems with centri blowers is the whoosh sound when you are crusing and the bypass is open. Anyway to eliminate that? Don't mind it when I accelerate and let off but all the time it will get irritating. I don't know if I can wait till the end of june/July for the 2650 though. Procharger it might be.

Thank you bro, Race Proven is coming along and should be done next week. Fingers crossed...

As the whoosh sound (which I love LOL) that street sweeper sound as I call it LOL. Its usually happening when you are off the throttle. Or at very light throttle, going up a gear makes it go away. In my Vette the Novi 1500SL was loud LOL so I would creep home at 2 or 3am at 25mph in 4th gear LOL. I'm usually a savage and ride around making noise for fun scaring people and pets LOL

[FATTEMUNK]

Can a centri be driven comfortably in traffic or commute? I have read people much more prefer the PD for a daily.

[Swagger]

Originally Posted by FATTEMUNK

Can a centri be driven comfortably in traffic or commute? I have read people much more prefer the PD for a daily.

With either blower you don't really notice it from a power standpoint without decent throttle tip in. The centi setup depending on the unit will have some whistle associated to it at idle and the whoosh you mentioned sometimes. But from a drivability standpoint provided the tune is on point, it will drive very much like stock until its asked not to LOL

[KingLT1]

Originally Posted by FATTEMUNK

Can a centri be driven comfortably in traffic or commute? I have read people much more prefer the PD for a daily.

They both will drive the same out of boost...Where you will notice PD advantage is when you are in a higher gear and step in the throttle...the TQ from the PD will let you just pull from any gear without needing to down shift. When I drove my brothers C7 Z06 I could just floor in 6th gear from 50 mph and it would just take off....that is what makes PD blowers soo much fun on the street.

[Turbo_RORO]

Originally Posted by toohighpsi

All you need to do is post engine MAP data from a 1/4 mile pass and you'll see the differences. A centrifugal will normally post a higher peak power number than a PD (because of the squared boost curve), but it will need to in order to have similar performance - a quick comparison of the MAP data during an accel run will show you why.

Well here is what I have to offer. This is a 1/8 mile pass not a 1/4 as I don't have a 1/4 mile track near me. You can see the MAP dip as TM kicks in. But before that you can see that the "boost curve" is not much different than yours. Now I will credit it to the fact that do launch in 2nd gear and have a stall converter in it. But that is my point. If I can leave the line making 5 psi and within 2000 I have 15 the torque will feel "instant". A proper setup, and fast car is more important to me than feel. And I will bet there is no more "instant" feel than leaving the line with 5psi and a 75shot kicking on in 100 RPM.

[toohighpsi]

Originally Posted by Turbo_RORO

And I will bet there is no more "instant" feel than leaving the line with 5psi and a 75shot kicking on in 100 RPM.

That's only until you ride in a car that has 18-19 psi instantly when leaving the line .

Not really enough data there to make any sense of it, need Throttle and RPM along with MAP to show an acceleration.

[FATTEMUNK]

Originally Posted by toohighpsi

That's only until you ride in a car that has 18-19 psi instantly when leaving the line .

Not really enough data there to make any sense of it, need Throttle and RPM along with MAP to show an acceleration.

I like the PD having the same boost at all rpms, unlike a turbo or centri, but there is alot more pressure on the engine all the time then right? Is running lets say 15psi through a motor on a 30 min commute vs the 5psi that scales to 15psi with the centri gonna effect the reliability?

[toohighpsi]

Originally Posted by FATTEMUNK

I like the PD having the same boost at all rpms, unlike a turbo or centri, but there is alot more pressure on the engine all the time then right? Is running lets say 15psi through a motor on a 30 min commute vs the 5psi that scales to 15psi with the centri gonna effect the reliability?

Boost is only there when demanded. At cruise with a PD SC, the bypass valve is open and the rotors are spinning in a vacuum created by the engine, which allows it to have the least power consumption as compared to any other SC type. This is one of the reasons PDs are favored by most all OEM manufacturers.

[Joe's_cool_1le]

I thought I read some where the LT1 has fairly thin cylinder walls. Any truth to that?

[KingLT1]

I would not be concerned being several are running low 10's to high 9's on the SBE. Yea if you do a mile long pull ring gap becomes a issue, but Most of the ones blowing up are from improper tuning and running the fuel system on the ragged edge. These engines with proper fuel supply and tuning will handle some power.

[Camaro Dude]

Originally Posted by toohighpsi

Boost is only there when demanded. At cruise with a PD SC, the bypass valve is open and the rotors are spinning in a vacuum created by the engine, which allows it to have the least power consumption as compared to any other SC type. This is one of the reasons PDs are favored by most all OEM manufacturers.

Ηmmm interesting, I did not know this..

[laynlo15]

My Camaro gets 23-25 mpg on the hwy but it also ran close to 138 roll racing and I've run almost 137 in the real quarter mile. I've run a couple P1's and D1's at the track and have handled them pretty easily, an F1 is a different story. I've not run one of those yet with similar mods. We have a few F1's that will run in the high 8's at over 150. Those should roll race pretty dam good. This year with my additional HP I should run 140 plus.

[Cerberos]

I think that under 1000 hp PD or centri will get the job done. Now on the Op particular situation i think a waste gated big centri will be the most flexible.

All of the superchargers can outflow your stock fuel system, the stock F1a will probably do it on the stock gearing, putting a wastegate can keep it on a boost level your car can handle as it is right now, and will allow you to grow later on.

It will aslo allow you to have a race only, race fuel only setting and a pump fuel setting.