Any long-time Magnuson 3.8 users..? - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 19 Old 08-12-2019, 08:54 AM Thread Starter
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Any long-time Magnuson 3.8 users..?

Hello. I have a 2007 JK Rubi 2-door, 3.8L 6-speed that I bought new. It has very low mileage (36,000) because I use my other vehicle as a daily driver and because I modified the JK for mild rock-climbing (4 inch lift, 37 inch tires). It actually goes 'OK' because of the 4.10 gears and 6-speed tranny, but getting on the freeway can be a little dull. Been thinking about a HEMI swap, but I really can't justify the $30k for something I don't drive much. Been thinking about the Magnuson/3.8 Kit for some time now, but know the 3.8 doesn't have that strong of a bottom end.

I was wondering if there's any long-time users of the Magnuson on the 3.8...?

Mileage? Comments?

Much appreciated.
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post #2 of 19 Old 08-12-2019, 11:00 AM
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im curious as well. original owner of a 09 JKUR 6spd 3.8. it only gets about 2000 miles a year. love to add more power too especially on the highway. been going back and forth with a Ripp or Magnuson.

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post #3 of 19 Old 08-13-2019, 06:20 AM
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maybe I can lend a related-topic addition to the OPs question by including a question I've recently wondered ; what is the recommendation for upgrading a candidate engine but one w/ higher mileage.
I have always assumed you'd wanna SC as new an engine as possible,right? Do folks add one to a rig w/ 75k on it ?

just curious and always wondered.



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post #4 of 19 Old 08-13-2019, 07:52 AM
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Originally Posted by j3ff3ry_j33p View Post
maybe I can lend a related-topic addition to the OPs question by including a question I've recently wondered ; what is the recommendation for upgrading a candidate engine but one w/ higher mileage.
I have always assumed you'd wanna SC as new an engine as possible,right? Do folks add one to a rig w/ 75k on it ?

just curious and always wondered.

Normally I would say yeah boost a low mileage engine over a high mileage one but Im currently at ~75K supercharged miles on my 3.8 and thing runs like a champ (knock on wood) so who knows whats right??? Boost it and see if she holds. If she doesnt, time for an LS
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post #5 of 19 Old 08-13-2019, 09:10 AM
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Originally Posted by Sallita View Post
. . . JK Rubi 2-door, 3.8L 6-speed . . . 4 inch lift, 37 inch tires. It actually goes 'OK' because of the 4.10 gears and 6-speed tranny, but getting on the freeway can be a little dull. Been thinking about a HEMI swap, but I really can't justify the $30k for something I don't drive much. Been thinking about the Magnuson/3.8 Kit for some time now, but know the 3.8 doesn't have that strong of a bottom end.

I was wondering if there's any long-time users of the Magnuson on the 3.8...?

Mileage? Comments?

Much appreciated.
I'd re-gear the differentials to 4.88:1 or 5.13:1, then see if you "need" more oomph.
Best bang for your buck, IMO.
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post #6 of 19 Old 08-13-2019, 06:21 PM
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I'd re-gear the differentials to 4.88:1 or 5.13:1, then see if you "need" more oomph.
Best bang for your buck, IMO.
Showed many people with M3's best bang for the buck was a regearů..
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post #7 of 19 Old 08-14-2019, 05:47 AM Thread Starter
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Showed many people with M3's best bang for the buck was a regearů..
The question wasn't about regearing. I get regearing, especially with an automatic. I'm running a 6-speed, so regearing isn't as critical. I actually like the 37's with 4.10 gears as I don't have to shift from first gear at 10MPH like I did with 32" tires.

Still wondering if there's any long time users of the Magnuson on the 3.8. The reason I ask is Magnuson is selling the Kit for $4k now. I've heard they are depleting stock and aren't going to be manufacturing the 3.8 Kit anymore because those motors are nearly 10 years out of production.
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post #8 of 19 Old 08-14-2019, 10:16 AM
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Originally Posted by j3ff3ry_j33p View Post
maybe I can lend a related-topic addition to the OPs question by including a question I've recently wondered ; what is the recommendation for upgrading a candidate engine but one w/ higher mileage.
I have always assumed you'd wanna SC as new an engine as possible,right? Do folks add one to a rig w/ 75k on it ?

just curious and always wondered.

No experience with the Mag kit but I installed my Ripp with alt pulley at 69k and now have around 98k iirc. Only issue I had was destroying the stock cats and causing random multiple cylinder misfires from the upstream cat material blocking exhaust flow in the downstream cats. Put the Ripp headers on and all has been well.

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post #9 of 19 Old 08-14-2019, 10:41 AM
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No experience with the Mag kit but I installed my Ripp with alt pulley at 69k and now have around 98k iirc. Only issue I had was destroying the stock cats and causing random multiple cylinder misfires from the upstream cat material blocking exhaust flow in the downstream cats. Put the Ripp headers on and all has been well.


RIPP headers. How are those things working out for you? So got the puff puff of a cracked manifold and leaning towards these replacements.


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post #10 of 19 Old 08-14-2019, 11:12 AM
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RIPP headers. How are those things working out for you? So got the puff puff of a cracked manifold and leaning towards these replacements.


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Worked out great until I gained a bunch of down travel during the ton swap. My only complaint is that the crossover should be behind the trans cross member. My driveshaft hits it when my driver side droops and pulls it out of that clamped joint. I'm actually going to go see an exhaust shop about rerouting it behind the cross member today. If you do get them, absolutely bathe your stock header bolts in pb blaster for like a week prior, I'll be surprised if you get them out without snapping at least one off. I snapped the rear most one on the driver side and just left it.. No way I was going to finagle that thing out. That was about three years ago. Both of my stock headers were cracked btw. Nice design jeep...

as to the OP, I think depleting stock should say something in itself. Tuning and user interface might be something to consider as well.
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post #11 of 19 Old 08-15-2019, 11:18 AM
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The question wasn't about regearing. I get regearing, especially with an automatic. I'm running a 6-speed, so regearing isn't as critical. I actually like the 37's with 4.10 gears as I don't have to shift from first gear at 10MPH like I did with 32" tires.

Still wondering if there's any long time users of the Magnuson on the 3.8. The reason I ask is Magnuson is selling the Kit for $4k now. I've heard they are depleting stock and aren't going to be manufacturing the 3.8 Kit anymore because those motors are nearly 10 years out of production.
I drove a Magnuson Charged 3.8 6 speed before I bought my Ripp, it wasn't bad, it belonged to a friend I wheel with. I can tell you from many "freeway on ramp competitions" my stock JKR 3.8 6 Speed on 35's with 4.88's was faster to 70 than his supercharged JKR 3.8 6 Speed on 35's with 4.10s by about 1/2 a Jeep length.

-The mechanical advantage of gears has a far greater impact on performance than the supercharger.
-If you hate shifting so often skip a gear or two.
-I installed my RIPP at 90K and have 112K with no issues at all, checked compression before and after, all is well, Jeep runs great.
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post #12 of 19 Old 08-18-2019, 11:31 AM
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Originally Posted by Sallita View Post

Still wondering if there's any long time users of the Magnuson on the 3.8. The reason I ask is Magnuson is selling the Kit for $4k now. I've heard they are depleting stock and aren't going to be manufacturing the 3.8 Kit anymore because those motors are nearly 10 years out of production.

where do you see the magnuson 3.8 for $4K? its no longer on their site


edit: found it! its on their site for $3995

09' White JKU Rubicon with some stuff

Last edited by Chris85xlt; 08-18-2019 at 11:43 AM.
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post #13 of 19 Old 08-20-2019, 07:50 PM
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I looked at these and coming from the coyote, voodoo, and LT4 boost gains... i just couldn’t justify the money for such little improvement. I regeared to 5.13 and it helped tremendously around town, but not on the highway for passing where i need it most.

If i had a pentastar, I’d do forced induction in a heartbeat and it might just be a turbo. Our motors and my tranny(yall all manual it seems) are just kinda black sheep.


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post #14 of 19 Old 08-30-2019, 11:33 AM
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4wheel parts has the Magnuson 3.8L SC for $3995 and with the current promo code u can knock off additional 10% off.

Magnuson website says the 3.8 SC is discontiuned

09' White JKU Rubicon with some stuff
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post #15 of 19 Old 09-19-2019, 04:49 PM
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The question wasn't about regearing. I get regearing, especially with an automatic. I'm running a 6-speed, so regearing isn't as critical. I actually like the 37's with 4.10 gears as I don't have to shift from first gear at 10MPH like I did with 32" tires.

Still wondering if there's any long time users of the Magnuson on the 3.8. The reason I ask is Magnuson is selling the Kit for $4k now. I've heard they are depleting stock and aren't going to be manufacturing the 3.8 Kit anymore because those motors are nearly 10 years out of production.
Hemi swap is closer to $8k than $30k, but since you already know everything I dont even know why you are here.
seriously. listen to the folks that know. your shitty gears are 80% of your problem. this is from a dude that had a RIPP and now has a hemi. Start in 2nd its its so inconvienent...or buy an auto.
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post #16 of 19 Old 09-19-2019, 06:32 PM
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post #17 of 19 Old 09-19-2019, 07:41 PM
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I actually like the 37's with 4.10 gears as I don't have to shift from first gear at 10MPH like I did with 32" tires.
FYI, I have 4.88s and 37s and I shift out of first at 20+ MPH regularly.
Was on 35s when I went to 4.88s, would prefer 5.13s or 5.38s for 37s.

20 MPH in 1st on 37s w/ 4.88s = 3954 RPM
20 MPH in 1st on 37s w/ 5.13s = 4156 RPM
20 MPH in 1st on 37s w/ 5.38s = 4359 RPM

To accelerate optimally, don't shift early - the 3.8 has squat below 2500 RPM.
If I'm lookin' to get cookin', I'll upshift at 4500-5000+ RPM.

Even with a blower, the 3.8 needs to rev a bit to make decent power.
Forced induction won't come close to giving you V8 torque down low.


Food for thought. Real-world results. Hope this helps.

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post #18 of 19 Old 09-20-2019, 07:44 AM
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Even with a blower, the 3.8 needs to rev a bit to make decent power.
Forced induction won't come close to giving you V8 torque down low.
"decent power" is subjective but my dyno graphs say otherwise. I have an auto so all the pulls started around 3K but the difference over stock was immediately huge.


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post #19 of 19 Old 09-22-2019, 11:24 AM
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i ordered the magnuson supercharger but they are no longer available. I ended up with a Ripp with a pretty hefty discount. its currently sitting on the floor of my garage cause im still pondering if i should really install it or not. A $8k Hemi or LS would be more ideal but can it still pass CA smog? i heard some rules had changed recently making it more difficult to pass.


im running 37x13.5r17 Toyo M/T's with 4.56 gears and it seems fine. the initial acceleration from a stop does strain the clutch a little more then if i was running 35's but doesn't rev out as quick. i like shifting around 3200rpms. 6th gear works as long as the road is fairly flat but cruising in 5th gear isn't an issue either.
i think a bit more power across the board mainly to get to and from trails would be great, so maybe SC'er will be ok?

if i decide to regear, might be time for all new axles and just go 40's

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Last edited by Chris85xlt; 09-22-2019 at 11:46 AM.
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