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Old 04-05-2012, 06:47 PM   #1
infernometallicSS
 
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Positive Displacement vs. Centrifugal

So I'm going to supercharge my 2012 L99, just wanting to hear some opinions on the type of supercharger they would go with, or have gone with. I am running on a stock bottom end so won't be running a lot of boost about 7-8 psi. I'm wondering about power down low with a centri. Obviously a centri doesn't pack the low end punch like a pd.
If there is anyone in the Phoenix area that has either type of blower that wants to give me a ride along, please let me know. I am going back and forth between the two types.
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Old 04-05-2012, 06:55 PM   #2
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I run a centri and love it and will always do so. They are beastly with rpms above 4000 and insane at 5000-6500. I will never go PD, YMMV

I recommend a PD for a street driven ride because it is instant gratification when using the right foot. The centri is pretty much useless below 3000-3500. It just depends on you goals, and based on what you typed, i think a Whipple will make you very happy
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Old 04-05-2012, 06:59 PM   #3
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Just depends on where you like your power at. Both are fun but mine sees the street alot more than the strip so I like the PD for the street, instant torque as soon as you step on it. PD's are probably harder to hook at the strip but I love my whipple and all the fun that comes with it!!!
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Old 04-05-2012, 07:56 PM   #4
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They're both awesome and quite frankly if you run a wastegate on the centri it will do a great imitation of a PD blower down low and run away from it like a scalded dog on the top end.
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Old 04-05-2012, 08:30 PM   #5
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My car is more of a "for fun" car. I take it to the track sometimes. But I have a feeling I would love that blast of power down low. But really I don't know cause I havent seen either.
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Old 04-05-2012, 10:20 PM   #6
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I have plenty of torque down low....I just installed a Procharger on mine. All the Supercharger systems are awesome in my book. I chose the Centri for the fact of the installation along with the mid to top end charge and there aren't any cooling lines, extra water pumps etc to deal with. I too thought long and hard about it, but made the correct choice for my application. IMO, the RPMs come up fast enough where all the talk about no torque down low etc is out the door.
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Old 04-05-2012, 11:15 PM   #7
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I have ridiculous torque Down low with my d1 procharger. Pulls very hard for only being around 9.5 lbs of boost or so. It's easier on the valve train. Not an instant hit of torque and lose top end power as rpms climb like a pd blower.

This thing just keeps on pulling and doesn't stop till you ease off the gas. I am very impressed with the linear power as it kicks in.

I recommend centrifugal all the way
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Old 04-05-2012, 11:39 PM   #8
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My plan was to build a stout street car only, no intent to run on the track. I wanted all the grunt I could get from idle to around 4500 rpms. Now, at times I go above this but not all that often.

Because of this, and after asking about the same thing you just did, and getting hundreds of good recommendations, I went with the maggie on my L99 and I could not be happier.

I have heard that the Centri blowers are similiar to turbo units, they start building boost at higher rpms then the PD blowers but they will continue to build boost right up till the limits of the rpm ranges. For this reason, for a strip car, the centri blowers would probably be best.

I have also heard they are easier on a stock engine. If your really hard on your car with a stock bottom end, the PD blowers will probably be the hardest on your stock bottom end.
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Old 04-06-2012, 12:57 AM   #9
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Have you done an ls3 conversion?

If you want to make any type of real respectable power out of the L99 swap over and put a blower cam. At 8lbs my tvs2300 is throwing out 620rwhp.
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Old 04-06-2012, 07:57 AM   #10
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Quote:
Originally Posted by camslambam View Post
Have you done an ls3 conversion?

If you want to make any type of real respectable power out of the L99 swap over and put a blower cam. At 8lbs my tvs2300 is throwing out 620rwhp.
No LS3 converstion done as of yet. I'm still up in the air with that one too. Lol.
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Old 04-06-2012, 09:01 AM   #11
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If your going over 550 RWHP, I think you will probably need to do the LS3 conversion, or if your looking to run at high RPMs alot. If for street use only, and you will stay under 550 HP, the stock valvetrain will probably be fine from what I have been told.
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Old 04-06-2012, 09:04 AM   #12
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Dyno of my car with a PD blower (TVS2300)
Area beneath the curve says it all. Instant 'holy shit' anywhere you want.

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Old 04-06-2012, 10:18 AM   #13
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Quote:
Originally Posted by EvoWake View Post
Dyno of my car with a PD blower (TVS2300)
Area beneath the curve says it all. Instant 'holy shit' anywhere you want.


Whats going on with your car above 5500 rpms? Are you having some belt slippage issues? I hear this is common with the Maggie on upper RPM levels, what belt are you using?
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Old 04-06-2012, 11:26 AM   #14
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Centrifugal all the way. The no torque down low argument is total bs and a gimmick to get you to buy a heat pump, I mean positive displacement blower. I know on this site that's what the majority go with but you can beat having a Procharger. The Centri will run cooler, make enough torque for you to have fun and allow you to get traction while maintaining constant power, the power won't fall off as the rpm's climb, it doesn't stress your motor like a PD blower, etc. I could go on and on but I'm having a blast with my Centri so don't get caught up in the overrated lack of torque down low argument.

This is on 7lbs with a D-1SC on a LS3 with no headers or meth
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