I am thinking about making my setup a blow through MAF setup. I was thinking of moving the throttle body back onto the manifold and then putting the MAF right in front of the throttle body. Here is my concern:

If you dont have any restriction (throttle body blade) in front of the supercharger, it is going to be pulling a lot more air through the supercharger. Will this affect anything other than having an air filter that needs to be cleaned more often?

I am thinking of:

-hotter sc casing temps. because it is constantly compressing a larger volume of air pulling through a 2.5" opening as compared to the throttle blades ~0.125" hole

-more engine load because of the same reason above e.g. that it is compressing a large volume of air as compared to when the throttle body was in front of it.

need input from you smart guys Thanks

 

do you have any links to current examples of this type of setup?

 

kind of lost
you saying you want to take the throttle body and maf from in front of the whipple and put them on the manifold, which would put it after the whipple.

 

Moregrip, I was trying to find some examples of this being done somewhere but to no avail. I'm not saying waste some time looking it up for me, but if you happen to get board and find any info post it up dude btw congrats on moderator. gees I need to get on here more


Mjgjr72, yup exactly what you said

 

how? doesn't seem like it would fit.

 

I am remembering every roots/screw application I have ever seen and I picture them all with the throttle body before the supercharger.

I guess this could just be equated with a turbo or centrifugal sc. application where the t.b. is placed post boosted air.

I'm thinking of other things that I would have to do to accomodate the move. These include: one way check valve on pcv...

 

DenaliHD, I would have to move the hammer on the t.b. inboard about an inch to clear the truck water pump neck. This is easy though as there is enough room on the stock t.b. shaft to do this. This is about the most difficult part I can think of, but even doing that is easy.

 

What kind of benefits so you expect to see?

Driveability?

The way I see it now, is that after a WOT run and you shut that throttle blade closed, you have no need for a blow off valve, as the compressor has nothing to compress due to the restriction of the TB blade imposing a vacuum on the intake tract.

I could see that having the TB blade closer to the cylinder heads might have a benefit. The engine would see the demand sooner, as there would be a large column of compressed air ready to move right into the cylinders. But then you would need a BOV to vent the air that would be jammed up in the piping and intercooler.

Feel free to correct me if I am off.

 

Fandango you are right. I guess I should have prefaced this with my goals. I am after better air metering, therfore fueling, by moving the maf. I cannot however just move the maf to post boost but leave the t.b. where it is. In this scenario the pcv system air would be getting metered and then throwing things off.

This is more of a daily driving issue than a WOT issue I am trying to solve. WOT is the easy part to tune for. Daily driving...not so easy.

 

If you we're to construct such a set-up it would have to incorporate a large by-pass valve to recirculate the charge. Without it the charge would load the blower up and stall the engine at idle. A twin screw might not stall but it still would build up a ton of heat and make a lot of noise. Which by the way is also why a blow off valve wouldn't work, too much constant noise. Over all it's not a good idea, that's why nobody does it more than once. Find someone who can tune it and you'll be much better off.

By the way I've been building, tuning, and racing positive displacement supercharged Thunderbirds for about ten years now so I'm not just blowing hot air.

Vernon