Ls3 in YJ - JeepForum.com
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post #1 of 16 Old 11-21-2019, 05:14 PM Thread Starter
gsdrule
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Long tube headers in YJ with ls3

Hello Iím looking for information on anybody who has an LS motor in their YJ that is running long tube headers. I have a built Ls3 in my jeep and Iím running out of air. Just got it off the Dyno and I Need to be able to let the motor breath more.
Thanks

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Last edited by gsdrule; 11-21-2019 at 05:26 PM. Reason: Change title
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post #2 of 16 Old 11-21-2019, 07:17 PM
fishadventure
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Describe running out of air... that phrase doesn’t usually come in nearby a sentence about headers.

[size=ď3Ē]Shackles & D-rings are different things.
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post #3 of 16 Old 11-22-2019, 06:30 AM
Waternut
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I've got an LS in my Jeep and I'm familiar with the dyno tuning but never heard the phrase "running out of air". Usually when someone says the motor needs to breath more, they're talking about intake restrictions. Also very curious how they determined that your headers were the major restriction in the exhaust. Lastly, I haven't really heard of anyone in a full bodied Jeep say that a stock LS isn't enough power for them, much less an LS3. So what are you doing/trying to accomplish with this build?
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post #4 of 16 Old 11-22-2019, 06:44 AM
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What was your dyno numbers? Post up the graph...

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style intake
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post #5 of 16 Old 11-22-2019, 06:49 AM
fishadventure
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Maybe longer headers and a cam overlap overscavenging intake? I just don’t see that with tunable efi; scavenging doesn’t actually pull a vacuum, but too early injector firing I guess could dump a lot of fuel that could go out the exhaust and mess with the O2 sensor(s)?

I just didn’t understand the question.

[size=ď3Ē]Shackles & D-rings are different things.
Cranking IS turning over
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post #6 of 16 Old 11-22-2019, 07:47 AM
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Quote:
Originally Posted by fishadventure View Post
Maybe longer headers and a cam overlap overscavenging intake? I just donít see that with tunable efi; scavenging doesnít actually pull a vacuum, but too early injector firing I guess could dump a lot of fuel that could go out the exhaust and mess with the O2 sensor(s)?

I just didnít understand the question.
If he wants to optimize scavenging then 180 degree headers is where its at. Plus the sound of 180 degree headers on a v8 is rad. I doubt that packaging would fit though.

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post #7 of 16 Old 11-24-2019, 03:32 PM
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Is this a good time to input a joke about hood vents?
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Stop whining about the 'ride' - If your YJ ain't wrangling your soul free, then might I suggest you buy a stationwagon... at least you can fit all your bull**** in the back.
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post #8 of 16 Old 11-25-2019, 06:29 AM
fishadventure
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Originally Posted by bruinjeeper View Post
Is this a good time to input a joke about hood vents?
No.

OP apparently hasn’t come back, either.

[size=ď3Ē]Shackles & D-rings are different things.
Cranking IS turning over
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post #9 of 16 Old 11-26-2019, 05:59 PM
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He must have ran out of air
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post #10 of 16 Old 11-27-2019, 09:19 PM Thread Starter
gsdrule
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Quote:
Originally Posted by Dake View Post
He must have ran out of air
got it figured out
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post #11 of 16 Old 11-28-2019, 08:49 AM
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So don't just say you got it figured out - share what it turned out to be. This forum is all about sharing our info.
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post #12 of 16 Old 11-28-2019, 08:57 AM
JeeperDon
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I have no idea why someone would need that much power in a YJ.
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post #13 of 16 Old 11-28-2019, 10:11 AM
Joe Dillard
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You and/or your mechanic need to invest in a good set of these. Somebody probably has a Black Friday sale on 'em.

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post #14 of 16 Old 11-30-2019, 07:30 AM
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Originally Posted by JeeperDon View Post
I have no idea why someone would need that much power in a YJ.
ratty mud drags? pulling?
Nay, no, no- those guys are more like 1200-1500hp LOL

[size=ď3Ē]Shackles & D-rings are different things.
Cranking IS turning over
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post #15 of 16 Old 11-30-2019, 05:17 PM
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Since when does 370 wheel hp equal 528 engine hp? No way 158hp gets lost in the driveline. Realistically 60hp, so 430 engine hp. Still a good number, must be a blast to drive that thing, not arguing with that .


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