Boost of power when its cool out
05-06-2013, 07:35 PM
#1
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Year: 1989
Model: Cherokee
Engine: 4.0
Boost of power when its cool out
Yes I know cooler air going thru the intake is good but I had a huge boost in performance this morning. Was about 60 out when I went to work. I hit the gas like usual making a left turn from a dead stop and ended up drifting the turn ( yes it was awesome 
) when I did not intend to do so. I ran 89 octane thru the jeep last week was about 1/2 tank of gas then went back to 87 octane this week. Any ideas why I would experience a gain this noticeable when I have never had one before in this wheather?
) when I did not intend to do so. I ran 89 octane thru the jeep last week was about 1/2 tank of gas then went back to 87 octane this week. Any ideas why I would experience a gain this noticeable when I have never had one before in this wheather?
05-06-2013, 09:55 PM
#2
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Year: 1998
Model: Cherokee
Engine: 4.0L HO
Way too many variables to form any positive conclusions.......the butt dyno is very unreliable. Ours runs better after a wash and wax.
05-06-2013, 10:24 PM
#3
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Year: 1989
Model: Cherokee
Engine: 4.0
Just weird its never ever run as good as it did this morning. Biggest thing that got me is I didnt go past 1/4 throttle which is less then usual on this particular turn.
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05-07-2013, 03:51 PM
#12
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
05-07-2013, 04:04 PM
#13
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Year: 1997 & 1999
Model: Cherokee
Engine: 4.0 I6
60 is warm! The average annual temperature where I live is 50.5 farenheit (I just looked it up) and it goes as low as -22 and as high as 95.
I notice the same thing as you but notice it in reverse... when it gets "hot" out, it feels like I'm down on power. I think it just comes down to oxygen density at different temperatures. Similarly, you notice varying power depending on elevation. A quick google turns this up: "horsepower increases by about one percent for every 10 degree drop in intake air temperature".
I notice the same thing as you but notice it in reverse... when it gets "hot" out, it feels like I'm down on power. I think it just comes down to oxygen density at different temperatures. Similarly, you notice varying power depending on elevation. A quick google turns this up: "horsepower increases by about one percent for every 10 degree drop in intake air temperature".
05-07-2013, 04:41 PM
#14
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Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Yup, that's why mods like cold air intakes (snorkels that draw cold air from outside of the engine bay) and the IAT relocation work.