2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

94 3.0 4x4 XLT headers and Cold Air Intake

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Old Jan 30, 2022
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FordfknRanger's Avatar
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From: Yuma Arizona
94 3.0 4x4 XLT headers and Cold Air Intake

Saw a video on YT channel name is The VulcanVideo titled: Modded 3.0 Ranger Update.

I wanted JBA Headers like his long tube but maybe because mine is 4x4 that's not possible and I can't find them. Jegs has shorties so I guess that would work.

Also can't get a decent Cold Air intake and I hear they don't work well with that setup for the increased HP. But they do sound good.
Any leads on a good one? Thank You!!!

Any Recommendations. Not much stuff for the 3.0 1994 and below. I get it. It's old. But man, the options are rough.
Truck registered in AZ so no Need for California compliance. ​​​​​
 
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Old Jan 31, 2022
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RonD's Avatar
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Welcome to the forum

Just a heads up on the 3.0l Vulcan engine
This was Designed as a high RPM engine
Most engines make best torque/power at 2,500-2,900 RPM
3.0l Vulcan makes best torque/power at 3,500-3,900 RPM
So you need to "drive it like a rent mule", lol
Get those RPMs up and keep them there, that's what it was DESIGNED for
It got the nick name "3.slow" because people didn't know about its design so drove it at 2,500-2,900RPM and complained about no power, of course it has no power at those RPMs, it would be like driving another engine at 1,500-1,900RPMs


All fuel injected Rangers, 1986 and up, came with a cold air intake
The air filter box has a tube that pulls air in from in front of the rad support, behind the grill

If you are pulling in air from INSIDE the engine bay then its not a cold air intake..............is it

Air flow noise, when you roll down your window a bit at 60MPH you now hear a noise that wasn't there before, why?
That's from air turbulence, air is no longer flowing smoothly around the cab, so noise

3rd party air intakes "sound cool" because they cause turbulence, and this reduces power, it ain't much of a reduction so the "cool" factor wins out for many people
But know the facts going in, intake air noise is "bad", means its restricted in some way




Don't have a 3.0l Ranger so can say on the headers but 2WD or 4WD shouldn't matter

All factory exhaust manifolds are "tuned" since the 1960's
They are called Scavenging exhaust systems
Its a science and an "art", lol
Lots of info you can read on whats involved on Scavenging exhaust

Basics are
When an exhaust valve opens the exiting exhaust "pulse" has a velocity set by the size of the exhaust port and the pipe it enters
As that pulse travels down the smaller pipe it gets to the "collector", which is a larger pipe
Basic physics is when a fast moving flow of anything goes from a smaller tube into a larger tube it creates a PRESSURE drop, that's important

So exhaust manifolds(headers) are tuned by size and length of smaller pipe and size of larger pipe(collector) and the engine size/displacement
There are 3 basic, off the shelf, "tunes" for exhaust manifolds
Low RPM
Mid RPM
High RPM

The velocity of the exhaust Pulses in the manifold cause a Lower Pressure in the collector to build up
This lower pressure SUCKS exhaust out which leaves more power on the Crank because its not PUSHING the exhaust out, so Scavenged free power for the engine
The design of the manifold decides when the lowest pressure occurs in the RPM band, low, mid or high
Most people opt for low RPM, faster off the line power
Factory manifolds are almost always mid RPM
Racing manifolds are high RPM

And just FYI
Factory scavenging manifolds are where the MYTH of back pressure came from
People would put "free flow"(larger pipe headers) on their engines
Then go for a drive..............."WTF!!!!!, I lost power?????"
So concluded, wrongly, "This engine must need back pressure"
What they did was to lose the factory tune that got them that extra scavenged power
No 4-stroke engine runs better with back pressure

Even a dragster, or any single tube open exhaust for each cylinder, are "tuned" by size and length of that tube to create a lower pressure at a specific RPM
 

Last edited by RonD; Jan 31, 2022 at 12:10 PM.
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