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Old 07-16-2015, 10:44 AM
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How does altitude effect the 2.5l

Okay, for starters I'd just like to say we all know the 2.5l engine is unbreakable, but kinda turns into a steamy pile of crap on the highway and hills. regardless, when I was camping over the four I noticed the engine was boggy even going down hill. I can normally get rolling over 70 on flats and downhill and not have any worries, but up in the hills I had a hard time getting the thing up to 60 on flat land and down hill(I normally do 70 on the freeway between home, work, and school). What cold have put that much hurt on the engine? In first through third it was an absolute trail beast, but on the roads it just crapped out. Was it alititude? Was it the low octane gas(85)? Once we to out of the hills it acted normally, 70 the rest of the 100 mile journey home.

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Old 07-16-2015, 10:49 AM   #2
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I would say a mixture of the low octane fuel and thin air(less oxygen to burn) lowered your already abysmal horsepower. I've recently gotten my 2.5 to do 70, now I'm starting to think it may not be so horrible on the highway, although I haven't taken it there yet.

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Old 07-16-2015, 11:06 AM
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Like I said, I do 70 on the highway with no troubles except for this one time. I forgot to mention: I'm on stock suspension and gears running 31x10.50 A/T tires.(probably not helping my uphill case, it still gets me where I want to go)
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Old 07-16-2015, 11:39 AM   #4
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Altitude affects all engines, the less you have to lose, the more you will feel it. The fuel injection will help on fuel mixture, but nothing can correct the loss of power at high altitude.
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Old 07-16-2015, 11:50 AM   #5
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If you were above sea level by any significant amount, your engine will have less oxygen available to mix with your fuel. That means less horsepower.

You said it was fine before and after the trip, I'd say higher elevation is your culprit.
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Old 07-16-2015, 12:55 PM   #6
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Quote:
Originally Posted by VTAK8k View Post
If you were above sea level by any significant amount, your engine will have less oxygen available to mix with your fuel. That means less horsepower.

You said it was fine before and after the trip, I'd say higher elevation is your culprit.
Agree 100%. Been there, done that with, multiple vehicles. V8s less noticeable loss than I4s. Turbocharged 4 was good uphill in the Rockies. FI rotary engine in a light 1985 RX7 noticebale drop in power, not as much as a 4cyl drop in heavier YJ. 4 cyl 1995 Nissan 4x4 pickup really sucked. I was being passed by semis uphill.
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Old 07-16-2015, 01:20 PM   #7
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I've been on a number altitude trips, even a V8 will make much less power at 12,000 feet. Physics and chemistry dictate how much power you can make, and the 2.5 is already really weak. About the only thing you can do about it is forced induction.

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