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Unread 05-05-2013, 12:14 AM   #1
zRoxxah
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1996 ZJ 
 
Join Date: Apr 2013
Location: Tucson, Arizona
Posts: 176
Quick Horsepower Gains

What the title says...share with us some methods or secrets you have done to squeeze a little more power out of your ZJ. I know our frames can't handle that much of an increase but it would be nice to get some more distance on those kids with the civics...joke. Also I "Coulda had a V8" since I have the 242
I plan on throwing a straight pipe in there and maybe do a light overhaul..clean the throttle body, sludge removal, rebuild etc.

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Matte Black '96 ZJ 4.0
IRO 3.5" Benchmark Lift, Bilstein 5100's, 31x10.5x15 Westlake SL369 A/T's, Moog Super Trail Boss SS, KOR Rad Support, Chopped-up Front Bumper
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Unread 05-05-2013, 02:19 AM   #2
Mickey_D
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Location: 40 3'42.36"N 112 2'16.73"W, Utah
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There are several, but none of them are cheap. All the cheap ones are completely ineffective.

One of the most effective (and coincidentally one of the most expensive) for your 4.0 is to stroke it.
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1953 Willys M100 trailer Tagalong
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Unread 05-05-2013, 10:26 AM   #3
ratmonkey
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1997 ZJ 
 
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without head work, stroker, or forced induction the 4.0 doesn't respond to mods very well. intake, exhaust, injectors, bored tb, and a header only really amount to under 20hp on these things.
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'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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Unread 05-05-2013, 02:06 PM   #4
underpowered
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1998 ZJ 
 
Join Date: Nov 2005
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e-fans and AC delete may free up a bit of HP but the 4.0 will never been a speed demon in a ZJ.
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Unread 05-05-2013, 03:13 PM   #5
PolkaPower
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1998 ZJ 
 
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Look through here. Some projects and ideas to keep you busy maybe http://jeep4.0performance.4mg.com/
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Unread 05-05-2013, 10:07 PM   #6
dnuccio
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1995 ZJ 
 
Join Date: Jul 2012
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a fairly easy way to get more horsepower is to buy a 5.2 ZJ
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Unread 05-06-2013, 12:12 AM   #7
just_urd
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^^ there's always that....
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Unread 05-06-2013, 09:27 PM   #8
Mickey_D
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1997 ZJ 
 
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Location: 40 3'42.36"N 112 2'16.73"W, Utah
Posts: 6,793
Or the ever elusive 98 5.9L ZJ...
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1953 Willys M100 trailer Tagalong
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