Effectiveness of RAM induction?

[Bruce]

they are able to manipulate the nder hood air flow alot more then the
average Joe, since they don't have to worry about snow, or heavy rain.
There is a Mopar book that shows the design elements of a forward opening
scoop which in MO is far different from ram air.
Bruce


----- Original Message -----
From: "Don Berry" <donbe at MICROSOFT.com>
To: <diy_efi at diy-efi.org>
Sent: Friday, October 12, 2001 2:46 PM
Subject: RE: Effectiveness of RAM induction?


> The Pro Stock drag races have done significant testing in this area -
> Warren Johnson in particular. Their conclusion was that the increased
> drag offset any gains in ram effect.
>
> -----Original Message-----
> From: Diehl, Jeffrey [mailto:jdiehl at sandia.gov]
> Sent: Friday, October 12, 2001 11:26 AM
> To: 'diy_efi at diy-efi.org'
> Subject: RE: Effectiveness of RAM induction?
>
> 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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