Can't decide Centri/Pos Disp? (moved 2011)

[rsb5772]

I'm looking to force some air through my new '11 5.0, and I know the difference between the two, as far as where they make the power, but I'm not sure which would be best for me. My car isn't a daily driver, but not a race car. Driving easy, with the flow of traffic, I shift at about 2,500 rpm's, which makes me lean towards the centri chargers. Am I wrong in thinking that going that route would keep my milage about the same, (around 16mpg) due to it not making large amounts of boost at lower rpm's?

Any help would be great, and if you have one or the other, why you chose the type that you did. Thanks.

 

[retfr8flyr]

With normal driving the screw type will drive just like stock. The bypass valve in the blower will keep it from making boost unless you get on it. The gas mileage should be about the same with both blowers. If it were me I would go with the Whipple kit or a turbo. I'm not a real fan of Centri style blowers.


Earl

 

[cobra mike]

Fun on the street. Whipple or kb all the way. If your More drag strip oriented, centri, dosent hit the tires as hard.

Im a turbo guy myself. The feel of a turbo car can't be matched

 

[rsb5772]

Thanks for the input. I've been looking at the Procharger and KB Mammoth. One other question, which would be the better choice as far as upgrading later down the road, if I were to drop a build motor in. That is why I've been looking into the Mammoth. I've seen several write-ups on the centri blowers, but not as much on twin screws, the KB in particular. Thanks again. I think I have a problem. I've been selling all my other toys to add to my car. Once I sell my bike, I will be pressurized!

 

[cobra mike]

I know leathal is doing a 2.9 whipple on a 2011look into that. It will have alot more left in it for future mods

 

[rsb5772]

Yeah, I've read up on that thread, but it seems to be at a stand still until the mag featuring the build comes out. Also following one on the KB. I wonder why there doesn't seem to be anything about the two FRPP kits. So far, the Mammoth is most appealing, with option to upgrade the size of the blower, throttle body, and the intake/filter not sitting above the headers. I'm also going to talk to a local shop (Fastlane), about it, since I'll end up taking it to them to dyno tune it.

 

[Steedman07]

Coming from a centry guy......Go turbo...

 

[RectalRampage]

PD FTW!!!!!

A PD blower is best for DD, it will give you the best tilt-in driveability'.

 

[l337pirate]

I agree with the rectalrampage feller. PD is the way to go.

There have been many dyno's posted across the interwebs, that show some Cent blowers actually post lower torque number then stock at low rpms before it builds enough boost to counter the parasitic loss.

 

[Steedman07]

I agree with the rectalrampage feller. PD is the way to go.

There have been many dyno's posted across the interwebs, that show some Cent blowers actually post lower torque number then stock at low rpms before it builds enough boost to counter the parasitic loss.

Why are you worried about what happens at 2,000 rpm??

 

[RectalRampage]

Why are you worried about what happens at 2,000 rpm??

I may be going out on a limb here but...

Id imagine because the OP stated:

"'Im looking to force some air through my new '11 5.0, and I know the difference between the two, as far as where they make the power, but I'm not sure which would be best for me. My car isn't a daily driver, but not a race car. Driving easy, with the flow of traffic, I shift at about 2,500 rpm's, which makes me lean towards the centri chargers. Am I wrong in thinking that going that route would keep my milage about the same, (around 16mpg) due to it not making large amounts of boost at lower rpm's? "



Thus.. a PD blower will give him the tilt in boost he wants for his driving style if he needs it, and when hes off the throttle it wont.

A cent blower builds boost with RPM and can actually make less power then stock at such low revs.

Good day sir.

 

[l337pirate]

Why are you worried about what happens at 2,000 rpm??

Well if I usually drive easy, shift at 2500 rpms, but looking to add boost. I would want a type of boost that fits my driving style.

More conservative driving will benefit more from a positive displacement setup then a centrifugal. Just one of the many advantages of the PD over a centrifugal is that low end power and the tilt-in response.

The OP clearly stated that he wasn't building a race car. So the advantages that a cent blower would have aren't as advantageous for his situation. Seeing how the cent blowers are RPM dependent for power, it would force the OP to change his driving style to benefit from that kind of blower. The PD is clearly the better choice.

 

[07stangcs]

KB mammoth FTW!! Instant boost,better MPG and tons of room to grow. KB states this blower can support 1400 flywheel horsepower.

 

[RectalRampage]

Or whipple :-D

My problem with Kenne Bell is the kit's appearance... A lot of the components are way under machined and overall 'cheapened' - it gives a 'home depotish' build appearance to an otherwise expensive setup.

Both setups will be very comparable.

 

[96blowncobra]

cant help much for the 2011 but on my 05 with a 2.3 whipple i get 21mpg riding around town if i keep my foot out of it and i can roll in it and blow the tires off whenever i want.....

 

[l337pirate]

Or whipple :-D

My problem with Kenne Bell is the kit's appearance... A lot of the components are way under machined and overall 'cheapened' - it gives a 'home depotish' build appearance to an otherwise expensive setup.

Both setups will be very comparable.

Or a TVS.

On paper the TVS is more efficient then the twin screw until about 15-16psi of boost.

But the Roush charger suffers from the same problem as the KB. And it is aesthetically unpleasing.

The whipple/FRPP kit both look gorgeous IMO

 

[Bingo]

Of all the PD blowers, I'd get the Edelbrock.

 

[rsb5772]

Thanks again guys. I do like turbo set-ups, but I've already spent money on long tubes/x pipe/cat-back, so I'm going to leave that end alone. I didn't know much about the pd's bypassing the boost when not really on the throttle enough, which is one on my main concerns. Like I said before, I don't always need the pressure there. I am looking forward to seeing the "E-Force" when it comes out, and will compare it to the other pd units.

 

[Bingo]

I am looking forward to seeing the "E-Force" when it comes out, and will compare it to the other pd units.

It's been out for a while now and makes good power...better than most w/ low psi.

 

[RectalRampage]

Or a TVS.

On paper the TVS is more efficient then the twin screw until about 15-16psi of boost.

But the Roush charger suffers from the same problem as the KB. And it is aesthetically unpleasing.

The whipple/FRPP kit both look gorgeous IMO

I don't care much for paper, lets see the track results and power curves boasting its superior efficiency over that of the Whipple; then we will talk. I can draw you a pretty picture too and call it good.

Other things such as inlet restrictions will affect how 'efficient' that TVS setup really is. I also agree that its looks are not as appealing as the Whipple setup.

If I am dropping that kind of loot on a FI kit, I want it to fit the entire bill - looks/fit & finish, performance, and reliability; Whipple certainly has all of that covered currently from what I have seen.

If the TVS proves not to be anymore efficient then the 2.9L Whipple, I see no reason to purchase the TVS as the Whipple is capable of far more boost.

If it is discovered that this stock motor can handle 700-800 HP on meth/e85 daily driven, you are going to wish you did not buy that TVS.