20hp, 20lb-ft Recipe for 4.0L Engine - THOUGHTS? - JeepForum.com
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Unread 10-03-2012, 04:54 PM   #1
seattle_yj
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20hp, 20lb-ft Recipe for 4.0L Engine - THOUGHTS?

Wondering if you guys saw this article in JP magazine the other month. It talks about squeezing an extra 20 HP and 20LBs Torque out of the 4.0L

What do you guys think? Experiences with the mods mentioned? Cost/Benefit ratio?

article is here: http://www.jpmagazine.com/techarticl...eep_4l_engine/



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Unread 10-03-2012, 06:24 PM   #2
wgirvine
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Baloney. They didn't do before-and-after dyno runs, so they have no idea if those mods increased or even decreased hp/torque. Without data, they're just guessing.
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Unread 10-04-2012, 03:08 PM   #3
seattle_yj
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The more I think about it, if your doing mods like this against a 10 - 20 year old engine, you might as well save up and do a Chevy SB swap. The cost is about the same and you will end up with a better power plant that you can mod more cost effectively down the road.
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Unread 10-04-2012, 03:29 PM   #4
ltrail
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Agreed, the butt dyno always reads higher since you 'want ' to know you just wasted all that money on hp gains. In theory on a fresh engine, or one will lower miles it would produce a decent gain. Header, intake, high flowing cat, decent muffler, then some injectors, and TB to liven up the extra airflow. THink of the dolar spent?
Flowmaster/magnaflow $75+
Header $500
Intake $100
Cat $75
Piping $50
Injectors $100
TB 62mm????

Now you have spent enough on a tired engine to have almost rebuilt the darn thing.
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Unread 10-04-2012, 06:17 PM   #5
seattle_yj
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I didn't realize when I first posted but the TB 62mm is 400 some dollars just on its own. That alone right there kills the idea. The stock one is 60mm so I'm pretty skeptical that the added 2mm is going to made a difference.
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Unread 10-04-2012, 08:30 PM   #6
PowderPusher
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Quote:
Originally Posted by seattle_yj View Post
I didn't realize when I first posted but the TB 62mm is 400 some dollars just on its own. That alone right there kills the idea. The stock one is 60mm so I'm pretty skeptical that the added 2mm is going to made a difference.
hell take the stok one out and bore it yourself with a dremel. then do some fine sanding and ploishing and you got a 62mm tb. dremel costs $60 prolly.
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4.0 , hp gains , more horse power , more power , more torque

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