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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 01-21-2009
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AIR FLOW AND EXHAUST

i put a k and n air intake on my truck and a new muffler with 2 2" holes for dual pipes but i dont have the pipes on it, it is cut at the muffler, i am wonderin if it is too much air flow and if i am possibly losing power instead of gaining it
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Old 01-21-2009
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Your not going to gain noticeable hp.
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Old 01-22-2009
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Too much air flow???? I dont think that is nessicarily a bad thing lol.. But yea you wont notice much..
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Old 01-22-2009
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Originally Posted by 04BlackFX4 View Post
Too much air flow???? I dont think that is nessicarily a bad thing lol.. But yea you wont notice much..
Yeah it could be, if you run like 4" piping you would have no back pressure.
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Old 01-22-2009
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Oops, i didn't see that, i thought more air flow as in more air in the engine from the k&n is what he meant.
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Old 01-22-2009
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it wont make a difference
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Old 01-22-2009
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You won't see much improvement in MPG. I basically did the same thing you did except I'm runnung a gibson Dual exhaust out the back, and I haven't seen any noticable change in MPG.
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Old 01-22-2009
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ok now i more back pressure better or no?
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Old 01-22-2009
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Quote:
Originally Posted by Jp7 View Post
it wont make a difference
Really? Gas engines need back pressure right? Or am I just lost here?

Yes, you're losing power by letting your exhaust exit right from your muffler and not running any kind of tailpipe.
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Old 01-22-2009
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ok now i more back pressure better or no?
You want close to the same, I think atleast.
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Old 01-22-2009
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ok now i more back pressure better or no?
Yes you will get better low-end power, which means a better response when you mash that skinny pedal.
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Old 01-22-2009
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You're not going to notice any real difference with just a CAI and exhaust. Sound, yeah, but not a whole lot of power.

2 and a half inch piping is the biggest I would go on a Ranger. As Trent said, the bigger you go, the more back pressure you'll lose, which means you'll lose power.

If you want power, you can get a computer chip, and it may give you a noticeable increase, but gaining more horsepower can get expensive.
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Old 01-23-2009
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There's no advantage to "back pressure" in an exhaust system. You get more power by being able to get more air into the engine than stock and exiting it with no restrictions. Unless there's a measurable restriction on your intake that the K & N removes, you won't get any more power as you won't be getting more air into your engine to consume.
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Old 01-23-2009
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its all about the sound, not the performance!
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Old 01-23-2009
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You have to have some back pressure in an exhaust system on a NA motor to promote exhaust scavenging. You can't just run 5" pipe header pack. You will lose a lot of low end power.
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