Quick, cheap and effective air intake mod

Where on the firewall is is connection ???

Originally Posted by 2500cummins

DM,
You can blame me for that one, thats my original list I posted on TDR. I had my JD dealer cross the fleetgaurd # for a price and thats the # he gave me, sorry.
I'll order one up next week and see what I get

:jump:

Thanks Man Let us know what you get

DM

[illflem]

Originally Posted by

Where on the firewall is is connection ???

You fold back the firewall insulation towards the driver's side. On the metal firewall you'll see where the metal is double to support the hood hinge. Holesaw a hole the same diameter as your hose so that the hole is though the single layer of metal with the edge of the hole up against the double layer.
Drill the same size hole in the back side of the airbox. Stick the tubing in, the spiral wire in the tubing will hold it in place, no need for clamps, glue, etc.
Leave the stock opening in the side of the airbox open.

Before


After

__________________
Bill
'95 2500 4wd auto
'95 3500 5 speed heavy hauler
Not stock

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Last edited by illflem : 01-22-2006 at 12:10 PM.

[Gary - K7GLD]

Keep in mind, that while Bill's approach WILL provide an excellent source of increased outside airflow using a STOCK filter and housing, it WILL NOT provide additional VOLUME of airflow in the same class as the BHAF.

Not an issue on stock, or slightly modded engines, as this thread was originated to address - but WOULD likely be an issue on more serious bombing levels if it was considered a substitute in efficiency for a BHAF.

__________________
White '02 Quad cab, NV5600, GAUGES! Comp, Walbro, DTT SS intake, Rip's 4 in. exhaust, Don M's 1.6's, DSS, Frantz oil bypass & fuel filters, Amsoil air filter, MOBILE Ham Radio-IC-706, 600 watt amp, '88 Kit 24 ft. 5er, 418 HP/978 Tq., 24 ft KIT 5er.

Thanks for the info How much air comes threw the hole you cut in the firewall??

DM

[illflem]

Originally Posted by

Thanks for the info How much air comes threw the hole you cut in the firewall??

DM

If I'm catching your drift right you're asking how much air comes into the cab.
Answer is none, the hole only leads to the intake area in the grill under the wipers.

I'm pulling around 400hp with an aFe drop in filter without pulling the minder down, plenty of air makes it though a drop in.

__________________
Bill
'95 2500 4wd auto
'95 3500 5 speed heavy hauler
Not stock

Not quite .... The hole in the firewall is suppose to force air from the windsheld whiper area in to the engine compartment ????

how much air is flowing out of your hose @ 55 mph

a guess.......

a lot ???

[illflem]

Originally Posted by

Not quite .... The hole in the firewall is suppose to force air from the windsheld whiper area in to the engine compartment ????

how much air is flowing out of your hose @ 55 mph

a guess.......

a lot ???

I don't have the means to measure it, better to ask Scotty

__________________
Bill
'95 2500 4wd auto
'95 3500 5 speed heavy hauler
Not stock

enough to matter ????

[MUDDY]

it is bound to help. bills ideere is a good one so i think ill sacrifice a few inches of my stinky slinky and cut a hole in the cowl and box :thumbsup

__________________
for IDAHO discusion and events check www.idahobombersforum.com

[Gary - K7GLD]

Originally Posted by

enough to matter ????

Not enough PRESSURE to blow yer nose with! In a related thread I started over in the TDR, a fella who likes actual testing and data over theory and guesses - sorta like ME - found that at normal freeway speeds, he registered 1/2 column inch of water - the thread is HERE:

http://turbodieselregister.com/forum...8&page=1&pp=40

and the specific post about pressure testing is here:

Gary sez:

SO, where do all those radical claimed power improvements with the ducted intake systems come from? If it isn't actual cooler air, well, damn, it must be that vast amount of pressurized air from the cowl area, right?

We'll see!

It's rather easy to install a water-column sensor down in the cowl area where the air intake mods usually drill that access hole, and get the ACTUAL down the road pressure buildup - and then we'll see how much pressure there REALLY is down there to "pressurize" the engine intake tract...

So, all you critics get your objections and preconceived notions ready, and line up for the NEXT round!
QUOTE]

Gary, a few years back I had performed the above prescribed tests using two MAP (Manifold Absolute Pressure) sensors and a simple volt meter with correlating readings charts and conversion charts from Pascal to PSI.

The first (#1 sensor) was installed in the cowl area where the air is drawn from for the cowl type system. The second was mounted in the intake tract ahead of the filter (dirty side). As I did, you should also find that you'll consistently see, at all road speeds nearly zero pressure readings in the cowl area (a few spikes of pressure (.5) but nothing sustained). Additionally, under light boost levels (6PSI and above) a slight negative pressure (vacuum) from this sensor (about those of the small pressure spikes (.5-3/4 but a bit more measurable during a boost condition). This will also be supported by actual vacuum levels measured by the #2 sensor in the dirty side of the intake tract (this reading will be consistently about 4PSI lower than a boost gauge installed in the intake manifold and level off just before boost starts to level out (drop)).

These tests were performed first with the HVAC system in the off position, next in vent mode and third in recirculation mode on the A/C cycle.

Using a cowl induction system (CIS)* that utilized only the 4.5” cowl hole, I theorized that the HVAC system with its series of vacuum operated doors do not allow for a good enough seal to actually hold pressure in the cowl area also the seal around the cowl and CIS area is not enough to hold back pressure.

Secondly, with a CIS that uses both a cowl hole and factory fender hole you cannot sustain pressure due to the obvious factory hole leaking it by. So basically, with either system the air flow to this area was pushed out of the area through numerous leaks including those not related to the HVAC system. Fresh air? YES, Ram air: NO! Louder turbo whine: YOU BET YA! More than my family could tolerate during extended towing.

SO, if you consider HIS testing, along with my own in that thread, how effective do YOU think "Cowl induction" really is, vs simply improved filtering under the hood?

ME? I'll take a simple underhood BHAF, at mods in the 400-500 HP range, and consider it plenty...

__________________
White '02 Quad cab, NV5600, GAUGES! Comp, Walbro, DTT SS intake, Rip's 4 in. exhaust, Don M's 1.6's, DSS, Frantz oil bypass & fuel filters, Amsoil air filter, MOBILE Ham Radio-IC-706, 600 watt amp, '88 Kit 24 ft. 5er, 418 HP/978 Tq., 24 ft KIT 5er.

Wow good stuff there gary ,,,,

With "the Products" availible under this type of apopliction ytou would think that there would be a steady flow of air coming threw the Firewall hole from the windshield area.

Obvisously you have already been there done that

Ill do some of my own testing if I can fit my boy under there ..........