questions on the newer 99+ intake
03-30-2010, 11:11 AM
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Year: 1997
Model: Cherokee
Engine: I6
questions on the newer 99+ intake
97 XJ sport. I'm going to bore my Throttle body soon to 63mm and was thinking about putting the newer intake on as well. I've heard from so many people its an awesome upgrade and i've heard from alot that you lose low end torque (which isn't what i want) but i wouldn't mine it staying the same with low end and gaining top end. Before i buy one i just wanted to verify some stuff with it from people that have done it and maybe had DYNO results....
03-30-2010, 12:33 PM
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Year: 1998
Model: Cherokee
Engine: 4.0L HO
Over at jpmagazine they lost 5hp on the dyno after installing the late intake on a '98 XJ.
'99-Up Horseshoe Intake
Myth: According to that great wealth of information that is never wrong, the Internet says you'll get a 5-30hp gain thanks to the '99-up 4.0L's swooped, equal length runners and larger plenum volume.
Our Thoughts: While a free-flow intake manifold can deliver more power, it's only going to allow as much air to flow as the cylinder head and camshaft will call for. Upping the intake runner volume too much will cause the intake charge to lose velocity, killing low- and mid-speed power and torque. On a '98-earlier engine running a stock camshaft and unported cylinder head, it's wasted effort.
Claimed Gains: 5-30hp
Actual Gains: 5hp loss on Trasborg's '98 XJ (Project Mileage Master)
http://www.jpmagazine.com/techarticl...ies/index.html
'99-Up Horseshoe Intake
Myth: According to that great wealth of information that is never wrong, the Internet says you'll get a 5-30hp gain thanks to the '99-up 4.0L's swooped, equal length runners and larger plenum volume.
Our Thoughts: While a free-flow intake manifold can deliver more power, it's only going to allow as much air to flow as the cylinder head and camshaft will call for. Upping the intake runner volume too much will cause the intake charge to lose velocity, killing low- and mid-speed power and torque. On a '98-earlier engine running a stock camshaft and unported cylinder head, it's wasted effort.
Claimed Gains: 5-30hp
Actual Gains: 5hp loss on Trasborg's '98 XJ (Project Mileage Master)
http://www.jpmagazine.com/techarticl...ies/index.html
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