20hp, 20lb-ft Recipe for 4.0L Engine - THOUGHTS? - JeepForum.com
 
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post #1 of 6 Old 10-03-2012, 03:54 PM Thread Starter
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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post #2 of 6 Old 10-03-2012, 05:24 PM
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.

The road goes on forever, the party never ends....
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post #3 of 6 Old 10-04-2012, 02:08 PM Thread Starter
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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post #4 of 6 Old 10-04-2012, 02:29 PM
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.

84 xj 350tbi, sm465, 203/205, 60/70. links and other junk.
what size sawzall blades does it take to fit 40's?
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post #5 of 6 Old 10-04-2012, 05:17 PM Thread Starter
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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post #6 of 6 Old 10-04-2012, 07:30 PM
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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