clearing up performance myths
06-05-2012, 02:32 PM
#1
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Year: 1998
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clearing up performance myths
Here is a good link with dyno results proving what will actually wake up your
tired 4.0
http://www.jpmagazine.com/techarticl...ies/index.html
tired 4.0http://www.jpmagazine.com/techarticl...ies/index.html
06-05-2012, 05:42 PM
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Originally Posted by Drewjharper1900
Thats intresting about the 99+ intake.
06-05-2012, 06:16 PM
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I posted it mostly to show throttle body spacers are a scam on a fuel injected motor, and that a programmer and a cai are not gonna give your xj 50HP.
06-07-2012, 04:58 AM
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Tb spacer seems to help with low end and at least from my expirence intakes help a lot. Not 50 horse but that an exhaust and a tb spacer makes a really noticeable difference, for me at least. Maybe ten horse if I were to guess maybe less than that. But there's definatley a noticable difference.
06-07-2012, 05:12 AM
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article is stupid and pointless. they have the only 4.0 i've ever seen a writeup on that actually lost power from swapping to the newer style intake. i would never believe hp claims on mods, nor would i spend a fortune trying to increase power on this tractor motor. if i wanted to make it fast, i woulda started with a 5.9 zj. i'll spend my money on suspension mods and making my rig capable
06-07-2012, 09:29 AM
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article is stupid and pointless. they have the only 4.0 i've ever seen a writeup on that actually lost power from swapping to the newer style intake. i would never believe hp claims on mods, nor would i spend a fortune trying to increase power on this tractor motor. if i wanted to make it fast, i woulda started with a 5.9 zj. i'll spend my money on suspension mods and making my rig capable
I couldn't agree more!
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06-07-2012, 09:35 AM
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I have the 99 up horseshoe intake and I could feel the diff in the seat of my pants. I read that article in my issue of JP awhile back and laughed.
06-07-2012, 09:42 AM
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Just about the only way to get a good power increase is either to stroke or blow it, TB spacers and chips are just about worthless on these.
06-07-2012, 09:43 AM
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Ive done jeeps with over the top engines and all they do is break. Give me a 4.0 that runs like a sewing machine and ill be happy, so will my jeep! Lol
06-07-2012, 09:44 AM
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Originally Posted by letsgomuddin
Just about the only way to get a good power increase is either to stroke or blow it, TB spacers and chips are just about worthless on these.
06-07-2012, 10:01 AM
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06-07-2012, 10:02 AM
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Originally Posted by letsgomuddin
Id LOVE a diesel in mine, although mine sounds like one at idle!