I have a 406 sbc with a ATI procharger on it. Right now the supercharger picks the air up from above the exhaust. This is not ideal.

I have seen cars with superchargers where they pick up the air from the firewall/cowl area, where the wipers are.
I have two questions. How do they filter the air coming in? and How do they attach it to the firewall?

I have seen this in magazines, but never in real life.
Any ideas?
Tim

Keep in mind that centrifugal superchargers are very sensitive to inlet and outlet flow restrictions. One of the reasons why so many people just put a cone air filter on a centrifugal is because they want to avoid the "breathing through a straw" syndrome of remote mounted air filters - and that the less than ideal filter location above the exhaust is a better tradeoff.

Another forum member, Jody, had a big block blow through that LOST almost 200 horsepower from the use of a U shaped inlet tube to keep exhaust heat away from the air filter inlet! Like I said, centrifugals are very sensitive to this.

If you cut into your firewall above the parting line you can get fresh air from there. Then you would need to fabricate an air filter enclosure - I would still reccomend using a cone filter mounted on the supercharger inlet. Be sure to have a generous size firewall cutout to feed your hungry beast.

You have another issue that I'm wondering what your solution will be: the awkward location of the blower outlet vs the throttle body location. You could use the funky S/U shaped piece that most L98 centrifugal supercharger kits use. Unfortunately it is a less than ideal shape for flow. Remember that on a blower application it is possible to have a high boost psi reading without having terrific flow. Measured boost psi is just a measure of backed up flow, not actual airflow.

It will take a little fab work, but there is a solution: take the throttle body off the front of the intake manifold and mount it on the driver's side of the intake manifold. If you are not really going to race the car then it wouldn't be worth doing, but if you are planning to race then it would be very worthwhile.

Thomas

Well, I am glad you mentioned the U inlet. I was going to try the new GTO inlet that wraps around the SC and picks it up in front of the inner fender. I guess I will just use the cone directly on the SC for now.

I think I have my SC outlet to throttle body figured out. I am using a silicone 3" to 3.5" elbow and a 3.5" stainless 1D elbow to the LT1 elbow. I realize this is not the ideal solution, but with the added diameter, it should help some with the airflow.

Thanks,

Tim

The diameter is not the prime issue - the two severe supercharger outlet to throttle body bends, 1 90 degree and 1 - 180 degree, are real flow killers. In case you've never thought about it - air under boost collides with turns and makes a lot of turbulence which reduces the boost in the manifold. If the car is just a cruiser don't worry - but if the track is a prime destination, well you decide.

Thomas

i have run several cent. superchargers, and call me lucky, but have not seen a huge drop off of power with bends-DONT use flex hose on the intake side of the blower, it can collaps
i have used steel bends to reroute the filter away from the exhaust(see DEC. super chev maple grove coverage for an engine shot of one of my cars) on a s/b in my 71 chevelle, i routed the intake along the fender, down thru the inner fenderwheel and in front of the tire, and ran an oversize filter(also had an innercooler routed underneath) and still blew over 16lbs boost thru
the carb(10.50's @ 128 mph, 93 octane, 3815 lbs in street trim)p/s, p/b's, a/c, 383 s/b, D1B procharger(went low 9's with my nova, 415 s/b with F2, innercooled-then crashed-ouch) 110 octane