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Go Back JeepForum.com > Models > Jeep Wrangler Forums > JK Wrangler Technical Forum > Might be an old question but thought I would ask.

Clayton Off Road WJ Long Arm Kits!Baseline 4x4 Lifetime Warranty 4340 Chromoly Axle Shaft KiClayton Off Road - JK Prototype Gas Tank Skid

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Unread 07-25-2014, 09:04 AM   #1
bdhinkson
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Might be an old question but thought I would ask.

So I am brand new to the forum and to the Jeep life. Just bought a 2010 JKU and was curious what ya'lls thoughts were on upgrading the air intake and exhaust. Searching through it looks like these mods seem to be a waste, so I wanted to know if my money was better spent somewhere else.

Thanks!

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Unread 07-25-2014, 09:36 AM   #2
jwmbishop
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For the most part - unless you change compression ratio, Cam profile/timing, valve size, cylinder head port shape/size, intake runner shape/size, ignition timing and fuel curve (last two controlled by computer algorithms) all of which determine the engines volumetric efficiency - changing intake and exhaust has negligible effect over the entire torque curve. It may have an effect to say the amount of torque at 3100 is increased but the amount at 2800 is decreased - no real gain and no way to measure it - seat of pants is NOT reliable because other senses (sound smell etc) effect your opinion (sounds faster and smells leaner so must be right?).

AND we drive at 1100 to 3500 - that range works best with small diameter (thus higher air velocity) intake. Increasing the size of the intake has the same volume of air moving much slower - less effective at lower RPMs. Just compare a 360 magnum head to a 360 head - the magnum makes more torque sooner than the 360 - and the ports are noticeably different!

If you have a 1/2 pipe supply a faucet with a 3/4 inch hose attached - would you get more flow by hooking a 1" hose to it? NO - same gallon per hour, as the faucet (just like the compression ratio, cam profile/timing, port shape and volume) is the limiting factor.
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Unread 07-25-2014, 10:42 AM   #3
bdhinkson
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Thanks for the detailed response! Having used those items in the past on other vehicles, I thought I would ask. Looks like I will be using those funds towards towards better off-road experience. Thanks again!
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Unread 07-25-2014, 06:05 PM   #4
HappyTrails
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Quote:
Originally Posted by jwmbishop View Post
For the most part - unless you change compression ratio, Cam profile/timing, valve size, cylinder head port shape/size, intake runner shape/size, ignition timing and fuel curve (last two controlled by computer algorithms) all of which determine the engines volumetric efficiency - changing intake and exhaust has negligible effect over the entire torque curve. It may have an effect to say the amount of torque at 3100 is increased but the amount at 2800 is decreased - no real gain and no way to measure it - seat of pants is NOT reliable because other senses (sound smell etc) effect your opinion (sounds faster and smells leaner so must be right?).

AND we drive at 1100 to 3500 - that range works best with small diameter (thus higher air velocity) intake. Increasing the size of the intake has the same volume of air moving much slower - less effective at lower RPMs. Just compare a 360 magnum head to a 360 head - the magnum makes more torque sooner than the 360 - and the ports are noticeably different!

If you have a 1/2 pipe supply a faucet with a 3/4 inch hose attached - would you get more flow by hooking a 1" hose to it? NO - same gallon per hour, as the faucet (just like the compression ratio, cam profile/timing, port shape and volume) is the limiting factor.
In other words....NO!
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Unread 07-26-2014, 05:54 AM   #5
HAFICON
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Quote:
Originally Posted by HappyTrails View Post
In other words....NO!
Exactly.. *L* However there is nothing wrong with ditching the oversized stock muffler for something smaller and adding a snorkel.
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