Ooof. Lots of inaccurate information in this post...
1) Centri kit with A2A intercooler and components will weigh almost identical to a PD blower....
2) A centri kit will not grow in efficiency to 8,000 rpm.... it will depend on the blower, inlet path, heads, cam profile, etc etc
3) Hard to keep on boost? Fundamentally you dont understand how the blowers work... centri builds to peak psi towards redline. Higher you spin (again based on variables) the more boost you will get....
4) Saying a PD blower is hard to drive and get traction is beyond ignorant. It’s borderline stupid. Look at graphs of the average 550-650whp P1X/Maggie/Whipple on an LT motor...they are very similar even torque curves. At a certain point they both will need stickier tires... as far as launching, again, at a certain point the Centri’s will need a converter to aid that....
5) Sounds like your friend needs better tires or driving lessons on how to launch a manual car on a non-prepped surface. Either way too many variables to use in an argument of power adders.
6) Your example of upgrading is confusing. Upgrading to a bigger blower also usually comes with the requirement of changing from a 6 rib to a 8 (preferably 10 rib if you are making real power on decent sized blower.) and upgrading cooling options. Also the bracketry is different depending on what kit you start with. Also to address your “one and done” comment about the PD blowers: the 2.3 Maggie, Whipple 2.9, Magnuson 2650, and Edelbrock 2650 have ALL hit 900+whp and the bigger units going easily over 1000+... so yes one and done but 90% of buyers won’t ever need/fund more than 800...
Ultimately each blower setup will need the same steps as you increase power: better belt wrap/grip options/better cooling/better supporting components to push more power. Look at your ultimate power goal and decide from there.
Quote:
Originally Posted by DorkMissile
It comes to application and what you want to do with the car.
In summary:
PD adds a lot of air at lower RPMs, and are most efficient at 5k RPM and under. There is just limitations on how well the impellers can grab ahold of air and squeeze it. More rotating mass, more components, more weight than Centri.
Centri units don't grab the air well under 3000, but once they do they grow in efficiency until 7500-8000rpm (well beyond GenV small block RPM).
If you have a manual car, i would lean more towards PD as you will spend more time in it's power band, but with an auto you will have an easier time keeping the power in it's sweet spot. I have a centrifugal on a M6 and unless you are doing wide open pulls, it is hard to keep it on boost.
PD sound great, and they make a small block feel like a big block. The technology gap is bringing the point in which PDs fall off and Centrifugals start operating is getting narrower, but PDs are really hard to drive and get traction.
Have a friend with a 09 Z06 with a Maggie (many other mods) who is near 800 wheel, and he plays hell getting any kind of grip on the street. When my car was N/A I could murder him out of the hole, but at about the 1/8th he would be next to me and running away. Now that I have the Centrifugal my car launches near identical to stock, but it would take a mile or more for him to catch me (I am 700 wheel).
Sometime people also overlook upgrading down the road - for my setup if I wanted to go from a Novi 1500 to Novi 2000 or a Vortech head unit, it is take off the belt, remove 4 bolts and swap the units. PDs are pretty much a one and done situation.
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