Effectiveness of RAM induction?

[Diehl, Jeffrey]

That seems fair.

The car in question is an MR-2, which is a mid-engine rear drive, Toyota 4
cyl.  In factory trim, the engine is transverse mounted on the passenger's
side and the TB is in the center.  From the TB, the intake makes 2 90 degree
accordion bends and enters a flapper-type Air Flow Meter.  From the AFM, it
has a 1 foot long tube that leads to the air filter box.  From the air
filter box, there is a tube which traverses the width of the car back to the
passengers side, up the rear quarter panel to a vent in the side of the car
behind the passenger's door.  All told, about 15 feet of intake tube.  My
car sucks air through a damned STRAW!

On common intake mod for these cars calls for removing the 2 90 degree bends
and mount the AFM to the TB and the air filter to the other side of the AFM.
Now the air filter is inside the engine compartment and is sucking HOT air.
Remember this car is mid engine and there is no real way to cool the engine
compartment.  This modification is known to produce 5hp on an engine with
only 112 before.

Now here is what I'm planning to do...
>From the TB, I'll go through a hot-wire MAP.  I'll have to build a circuit
to make the MAP look like the AFM for the ECU.  From the outside side of the
MAP, it's going to trumpet out to about 8"x6" and bend up toward the top of
the engine compartment.  This 8x6 intake box will come up through the engine
hood, where the air filter will mount.  Then I'm going to have a duct, which
is hinged over the rear window.  This duct will continue from the air
filter, up and over the rear window.  I'm toying with the idea of having the
duct trumpet out yet some more to about 6" height and 36" wide, right above
the passenger compartment.

I think this system will remove most of the restriction present in the other
systems.  It will get cold air.  Depending on the thermal qualities of the
material used, (ceramic coated?) I should minimize the amount of ambient
engine compartment heat that gets transferred to the air.  I've also opened
the system up quite a bit, instead of having to breath through a tube/straw.

So, if I build this system, should I see any RAM effect.  I drive down the
street at 30mph and stick my hand out the window and feel my hand pushed
back.  At the TB, the air is traveling at about 55mph @ wot.  But at the end
of the trumpet, the intake are is only traveling at a fraction of this
speed.  I should see ram benefit at above this speed, right?

Thanx for any input.
Mike Diehl,
'87 MR-2, 7age, Dual Pipes, hand-bent header.
'96 4-Runner, Bone stock.
'90 Corolla, Disguised as a Geo Prism!


> -----Original Message-----
> From: Bruce [mailto:nacelp at bright.net]
> Sent: October 11, 1999 9:00 AM
> To: diy_efi at diy-efi.org
> Subject: Re: Effectiveness of RAM induction?
> 
> 
> 
> So many different versions of what people call Ram Induction, 
> you'd have to
> mention exactly what your talking about.
> Bruce
> 
> 
> 
> From: "Diehl, Jeffrey" <jdiehl at sandia.gov>
> Subject: Effectiveness of RAM induction?
> > How effective is ram induction?  I've heard claims as high 
> as 25%.  I've
> > also heard people say that it's only effective at 150mph...
> > Care to discuss it?
> 
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