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post #1 of 21 (permalink) Old 10-26-2007, 08:59 AM Thread Starter
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altitude sickness fj style

Driving thru Colorado I experienced something strange, I have a 6mt and in high altitudes the fj is EXTREMELY sluggish, I had it floored in 4th gear and couldnt get over 55 MPH. Forget about 5th or 6th gear, the engine would almost die. also you loose the whomp sound from the CAI up there. As soon as we came down from the summit everything went back to normal. I wonder if it would of got better if we stayed up there for a long period of time. Let the engine computer mabey get time to compensate or do you yhink its always like this.

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post #2 of 21 (permalink) Old 10-26-2007, 09:15 AM
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Re: altitude sickness fj style

I had a 2001 Tacoma, when I went up North into the mountains I noticed a huge drop in torque and horsepower, didn't change much when I would spend an entire week at altitude. So, I traded that one in and got an identical truck 2004 Tacoma, with a supercharger installed after delivery, TRD. It had no noticable variance when I went up North, but I usually drive under boost with my heavy foot and all.

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post #3 of 21 (permalink) Old 10-26-2007, 09:48 AM
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Re: altitude sickness fj style

Generally it's called Physics.

I remember after riding motorcycles for years in Colorado, my first trip to visit a friend in Cali, OMG the power increase was incredible.

Quick search, the only formula I could find was:

BHP Loss = [Elev (ft) x 0.03 x BHP(at sea level)]/1000

So, here is what you'd get on a few of our passes here in Colorado:

Pass_____Altitude____FJ HP
Paved:
Vail______10666_____162.52
Loveland__11990_____153.03
Berthod___11315_____157.87

Unpaved:
Imogene__13114_____144.97
Mosquito__13186_____144.46

yes, you *might* feel a differnce... lol, try a lower gear! do you know it will go 60 in 3rd gear? You get used to driving that way out here.


Edit: Sorry about the underscores, but how the heck can you format a table on here? I guess I could embed a weblinked PDF, that seems like a long way to go to get stuff lined up!!!

Last edited by 5280FJ; 10-26-2007 at 09:53 AM.
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post #4 of 21 (permalink) Old 10-26-2007, 12:25 PM
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Re: altitude sickness fj style

mike, what that hell were you doing in colorado? Man I wish i had that luxury driving thru states. We can't even get the friggin Superferry running. Can you imagine my jelously.
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post #5 of 21 (permalink) Old 10-26-2007, 01:50 PM
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Re: altitude sickness fj style

I agree with a loss of HP at altitude, I live a mile high as well. We have had the FJ for days at 9-13,000 feet and not had the sluggish performance you reported. I drive over an 8,000 foot pass twice a week and do so at 85+ mph uphill, so I think you might want to change gas or have your dealer check it out. Something doesn't sound right there.

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post #6 of 21 (permalink) Old 10-26-2007, 02:19 PM
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Re: altitude sickness fj style

X2..When up on Engineer, and some of the others in Ouray, I had no problems with loosing HP. I'm running the TRD CAI, and felt nor heard anything like what your talking about. I agree, you got some bad gas or something.

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post #7 of 21 (permalink) Old 10-26-2007, 02:33 PM
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Re: altitude sickness fj style

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We have had the FJ for days at 9-13,000 feet and not had the sluggish performance you reported. I drive over an 8,000 foot pass twice a week and do so at 85+ mph uphill, so I think you might want to change gas or have your dealer check it out. Something doesn't sound right there.

I agree; I've had mine at altitude for extended periods and never experienced anything like the OP. Mine has driven over multiple passes in Colorado as fast as I cared to go.

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post #8 of 21 (permalink) Old 10-26-2007, 02:52 PM
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Re: altitude sickness fj style

you cant make up for less dense air.
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post #9 of 21 (permalink) Old 10-26-2007, 02:52 PM
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Re: altitude sickness fj style

Quote:
5280FJ previously said: View Post
Generally it's called Physics.

I remember after riding motorcycles for years in Colorado, my first trip to visit a friend in Cali, OMG the power increase was incredible.

Quick search, the only formula I could find was:

BHP Loss = [Elev (ft) x 0.03 x BHP(at sea level)]/1000

So, here is what you'd get on a few of our passes here in Colorado:

Pass_____Altitude____FJ HP
Paved:
Vail______10666_____162.52
Loveland__11990_____153.03
Berthod___11315_____157.87

Unpaved:
Imogene__13114_____144.97
Mosquito__13186_____144.46

yes, you *might* feel a differnce... lol, try a lower gear! do you know it will go 60 in 3rd gear? You get used to driving that way out here.


Edit: Sorry about the underscores, but how the heck can you format a table on here? I guess I could embed a weblinked PDF, that seems like a long way to go to get stuff lined up!!!
I agree, those are the same rough equations I learned in physics and Auto Mechanics. The power loss is pretty impressive isn't it. My old Ford Escort Wagon had 89 hp new! Imagine me driving my wife, two kids and much of my worldly possessions over those passes on the move out to college - pretty hysterical. My wife wanted to get out and jog alongside the car.

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Last edited by alpinist; 10-26-2007 at 02:55 PM.
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post #10 of 21 (permalink) Old 10-26-2007, 02:54 PM
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Re: altitude sickness fj style

Did you read his gear selection? Not gas, just shifting... 6th gear at 10K going uphill? lol
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