Which type of blower to choose...

[Matt300ZXT]

So I'm kinda tossing around the idea of blowing my SC400. I see the centrifugal types like the Vortechs with the fish bracket, and I see some with the roots style that takes the place of the upper intake manifold.

Is there a major price difference between all parts associated with either type or do they stay roughly the same? Also, any major pros or cons to one or the other? I mean I know both you'd have to tap the oil pan, run custom piping, etc, but just curious if there's something else I haven't thought of that makes one harder or easier to do than the other.

Also, which one would be more apt to produce that badass supercharger whine? :evil:

 

[-Nemesis-]

Generally speaking, a roots style is better at offering boost in low revs, but the vehicle will drive like it has a bigger engine, not like it has 'boost' as such. Too hard to intercool and lose efficiency at high boost/revs.

Centrifugal boosts up like a turbo and gives an intense top end rush, but little to no gains down low. Easy to intercool and can efficiently boost to any level.

Roots you need a full custom engine top, manifolds etc and the kit's aren't cheap.

Centri you need a fish bracket and some piping.

 

[Matt300ZXT]

Ok, wasn't quite sure about the real differences between the two. Thanks for the insight.

 

[stevechumo]

The easier way to boost the SC4 is with a centrifugal supercharger and the fish bracket. You can get it done within 2 days if you know how.

 

[JBrady]

The centrifugals (CF) make great top end power BUT...

The positive displacement (PD) superchargers make accross the range power. With a small 4 liter engine getting low end power is very helpful. CFs turn very high RPM (for a supercharger) whereas the PDs max out around 18k RPM. This does impact belt lift as the CFs are overdriven quite high.

The screw type PD superchargers have always claimed the highest adiabatic efficiency for a PD but the new Eaton TVS PDs are arguably as high.

Check out the links to the various blowers using the search feature.
Here is a good thread on the new Eatons.

http://lextreme.com/forums/showthread.php?t=11383

 

[ftruckn]

dont want to hijack but what L capacity are eaton m112's?

 

[kc95sc400]

I will argue (to the death!) that centrifugal chargers don't do much for low end. It's simply not true. The power is biased to the top end but there is plently of low end to go with it.

And, a vortech can be bolted on in a day. By far the easiest way to go and probably the cheapest as well. Just make sure to use a unit with counter clockwise rotation if you are using the fish bracket.

Just my couple of pennies.

KC

 

[spf_lexus]

I have a Procharger very similar to Kc95 and I will agree that I recieved a very noticable low end improvement to go along with the massive top end pull. because it's gear driven, even at idle it produces more air than naturally aspirated... not quite enough to show up on the boost gauge but since your engine is turning at around 1000+rpm the blower is still turning and still utilizing it's "step-up" gear ratio. So cruising around town and light-mid throttle gave much more power than before. Since it's mostly top end boost, you can keep it "off-boost" and easily save gas by driving under 3,000rpm. Getting up to 65mph merging on the freeway for a pull doesn't require much pedal. And then you have the knowledge that adding that 2/3 pedal will shoot you to 100+MPH in a couple seconds :burnout:



But what JBrady said is also true-

I would agree that the new Eaton TVS would be top dog. It is arguably as efficient as centri and has the streetable power band which makes for a more solid powerband. Downside is price as a manifold kit and a unit would cost thousands more than the fish.