Miss for the Mountains

Jhai

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Justin
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Finein74
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2021 Rubicon JL
Hi everyone first post!!!
Just moved to the Boulder area earlier in the year and just took delivery of a 21 Rubicon JL. 4dr, manual transmission. Already had a mopar 2” lift, 37” tires, regeared to 5.13, Borla ATAK Axle-Back Exhaust with Ceramic Black Tips…. Love the car.

My question is I drive up to Breckinridge almost weekly and the car does loose power due to the altitude. The reheating really helped as did the exhaust. Nervous with a cold air intake as the dealer shared that they get numerous check engine light issues with aftermarket air intakes.

so my question is what other mods can I make to get better performance I’m the mountains in 10,000’?

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JL MADDOG

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As a new JL owner you should understand that Jeep is NOT a car. So don't call it that again, understand? ;)

What engine do you have? A turbo would certainly help at those altitudes. With the regearing the additional weight of the wheel & tire combo should be overcome.

So a cold air intake, maybe a programmer and custom tune, would help.
 

InvertedLogic

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What issue are you having on I70? I don't have 37s, but my Gladiator Rubicon passes just fine with 4.10s and 35s and has no issues doing the speed limit or faster all the way to UT
 

pangmaster

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Congrats on the new Jeep!

Are you downshifting? To what gear? I’m on 35s and stock 4.10 and sometimes even on tiny Michigan hills I need to go down to 4th gear to stay at a reasonable speed. It’s worse at elevation.
 
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Jhai

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Ooooops. Definitely won’t slip on the Jeep car vernacular again. Haha. Thanks for the comments, education and support.

I have the 3.6L. On i70 heading towards the tunnel I have to down gear to third. Defiant was an issue before regearing and significantly better now but wondering what else I would go to.

there is a huge noticeable difference between boulders 5,000’ and Breckenridge’s 10,000’. I’m interested in towing a boat but not sure I’ll make it.

Sounds like options are
- cold air intake
- customer tuning
- Super charger

Does that sound right?
 

InvertedLogic

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Sounds about right.

However, if its still accelerating in 3rd, I don't see the issue per se. To the tunnel, my 8AT holds somewhere around 4000rpm at 70mph all the way up and I don't sweat it. My old TJ couldn't get past 60mph on that hill no matter what gear I was in and WOT :CWL:
 

kelvinator

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A fourth option could be to remove your mods and go back to the OEM configuration, if feasible.

I have the 2020 JLUR with 3.6L automatic, 35" tires, and a couple hundred lbs. of armor and wheel around Breckenridge and central CO with no loss of power. I topped Mosquito pass on Sunday at 13,100' with no issues. I share this to let you know that the factory setup is great at high altitude even with extra weight. I think one of your mods isn't playing nice, but which one?
 

guarnibl

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Ooooops. Definitely won’t slip on the Jeep car vernacular again. Haha. Thanks for the comments, education and support.

I have the 3.6L. On i70 heading towards the tunnel I have to down gear to third. Defiant was an issue before regearing and significantly better now but wondering what else I would go to.

there is a huge noticeable difference between boulders 5,000’ and Breckenridge’s 10,000’. I’m interested in towing a boat but not sure I’ll make it.

Sounds like options are
- cold air intake
- customer tuning
- Super charger

Does that sound right?
Switch to stock wheels and BFG KO2 ( 37”) — you will reduce your rotational mass greatly and that will be your biggest bang for your buck.

EOT

congrats on the Jeep!
 
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