Derf00

All depends, what is your ultimate goal for the car? Drag suspension would probably be best but would suck for daily driving, and daily driver suspension would suck for the drag strip on that beast. You can't have your cake and eat it too.

NYSE PONY

My goal is a daily driver that kicks butt and takes names on the street. I live in a relatively small town and with the SC that I am planning on using I should be close to "king of the hill" at least for a daily driver anyway. Just don't want to be embarrased - too many times- at the red lights in and around town.

sidmanic

The purpose of an after-cooler, inter-cooler, whatever, is to cool the air charge temp. That's it. That's why the SC's without an inter-cooler only run 5psi max because once you start increasing the psi on the compressor, the hotter the air charge will get and the greater the chance for detonation.
Another thing to point out is that a centrifugal blower only kicks in at WOT and only produces its max psi at the top of the rpm range, so when you are just cruising around town, you aren't sending any boosted air unless you got your foot in it. If you haven't done so already, you should consider running 4.10 gears or higher to take advantage of your blowers potential. Centrifugal's need high rpm to create boost.

sonicblue05

i think they are full time boost, just not peak till around 4000 as a roots type peaks at around 2900.

sidmanic

I guess the easiest way to find out would be to look at the boost gage during accel and see what it reads.

jbailer

As sonicblue05 said, centrifugal blowers boost all the time under load, not just at full throttle. The difference is they spool up like a turbo and don't hit peak power as quick. With a positive displacement, you are at full boost almost instantly. I believe that's why they call it positive displacement, it's almost like the engine's displacement is just that much more. You're right sidmanic, the best way to tell is log the boost on a 3rd gear pull. You'll see the boost climb. You'll also notice the torque climbs vs. with a positive displacement the boost is constant and the torque goes up very quickly. Also you could watch the boost gauge under partial loads.

Regarding the coolers, you're correct that they are both used to cool the charge temperature but the 2 definitely have 2 different affects. Cooling the charge before the air is compressed starts the process at a cooler temperature so as the air is compressed it is effectively that much cooler. The pressure to the intake manifold is just what was put out by the sc. Aftercooling will cool down the the heated air from the supercharger. Whenever you compress air it is heated. I believe the numbers are 70* at 8psi if it were 100% efficient. Imagine that air filling a container, then you cool that air. The volume of air doesn't change but there is less pressure because it is condensed. Therefore less boost pressure. I'm not saying that's bad, just the opposite, it's best to have cooler air going in. -Joe

clearym

The engine is one thing but the T-3650 is rated at 400 lbs of torque. If you're driving it hard a lot, with that much snot under the hood your Tranny will suffer as well.

sidmanic

I agree with everything you said although I think you misunderstood just the bit about inter-coolers. It seems that every company that manufactures superchargers has a different name for the part that cools the air charge. Doesn't matter what you call it, it does the same thing, more or less, whether its air to air or air to water. And positive displacement in regard to a supercharger mean that a given amout of air will be compressed for each revolution of the compressor. In my case, one revolution of the SC will compress 2.4L of air multiplied by the volumetric effecincy for the SC.