Turbocharger or Supercharger for my '99 4.0L inline 6 JK - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 7 Old 09-09-2017, 12:23 PM Thread Starter
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Turbocharger or Supercharger for my '99 4.0L inline 6 JK

I've become obsessed with getting every bit of power i can out of my baby.

My father runs a garage, i have discounts on parts, loads of equipment and tools to use, and car lifts.

I want to do as much fabrication as possible to reduce the cost. I just want to know, which would be better for an inline 6 4.0L AX-15 transmission Jeep Wrangler TJ.

p.s. Ballpark for me the barebones lowest cost of doing such a thing?
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post #2 of 7 Old 09-09-2017, 07:02 PM
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V8 swap would be better.


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- 37 Irok's - 4.88 - Detroit/OX -
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post #3 of 7 Old 09-09-2017, 11:47 PM
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@j3ff3ry_j33p .This one's for you pal.

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Originally Posted by thedirtman View Post
Running 37's as a daily driver is dumb
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post #4 of 7 Old 09-11-2017, 02:17 PM
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Intercooled turbo with boost controller to bring boost on low - if you have no smog laws. Add some water/methanol injection to that plus tune with more timing. If you choose the right water/methanol injection kit and set it up right, you can bring on more timing at a lower RPM. timing is where you get HP in a tune, more so than AFR. You have to back off the stock timing with FI anyway. An intercooler gets you some of that back. WMI gets you more back. Get that tune for higher octane gas too, like 93 or 94 if it is readily available. Yeah, V8s are cool too.
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post #5 of 7 Old 09-11-2017, 02:25 PM
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Originally Posted by White13JKUR View Post
Intercooled turbo with boost controller to bring boost on low - if you have no smog laws. Add some water/methanol injection to that plus tune with more timing. If you choose the right water/methanol injection kit and set it up right, you can bring on more timing at a lower RPM. timing is where you get HP in a tune, more so than AFR. You have to back off the stock timing with FI anyway. An intercooler gets you some of that back. WMI gets you more back. Get that tune for higher octane gas too, like 93 or 94 if it is readily available. Yeah, V8s are cool too.
For his '99 4.0 jk

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Originally Posted by thedirtman View Post
Running 37's as a daily driver is dumb
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post #6 of 7 Old 09-11-2017, 09:18 PM
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I have a low mileage '94 YJ 4.0l HO up with my folks house in N. Georgia which once they no longer use it for " getting off the mountain in bad weather " I have been savin for one of these. Banks Sidewinder...

So, minus the WMI, (only since I haven't researched the h2o-methanol cooling he is the expert subject matter guy on around here )I'd agree with @White13JKUR and turbocharge it...

The option of running it stroked can mitigate cost yet still provide a noticeable chunk of midrange torque and power from the strong blocked i6 if the turbo cost is prohibitive...Golen 4.2 and 4.6 strokers are known to be much punchier than the 4.0l itself ...

@coilrod . I caught the thread title SNAFU the OP made , heh ...it occurs about once a year around here that threads like this get posted; " my 1989 JK 4liter ,straight six blahblahblah..."




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Last edited by j3ff3ry_j33p; 09-11-2017 at 09:31 PM.
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post #7 of 7 Old 09-19-2017, 05:11 AM
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unless this OP, too, is like the others recently who've joined for but a single question and never to be heard from again, if that is not the case , mr. @Marky5mark4 , I noticed this on a GenRight's closeout section ystrdy


https://genright.com/products/scat-s...-0l-yj-tj.html






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