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Old 01-17-2005, 02:31 PM   #1
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Default Non-Bonneville related performance upgrades

I have recently purchased my wife a 2002 Chevy Trailblazer LS (4.2L I-6). We love it, except for the fuel mileage. My questions are will a CAI (or stripped stock box) and a lower thermostat have a positive effect on both performance and fuel mileage (or at least the latter)?

I know what options there are for both, I just want to know if I have a good understanding of both of these upgrades in that they will positively affect mileage and performance.

Thanks!
Mike
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Old 01-17-2005, 02:43 PM   #2
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They will both increase your gas milage. However, in the cold weather, a colder thermostat can sometimes have a negative effect on milage because the engine has trouble getting up to the optimum operating temps. At least that is how it is in my experience. I see you are from Florida though, so it shouldn't be a problem.
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Old 01-17-2005, 02:47 PM   #3
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the 160* I had in my Bonneville did create problems, but I have no had any with the 180*. I am trying to find a Trailblazer/Chevy forum where the exact technical aspects of the engine are discussed in more detail in regards to these modifications.
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Old 01-17-2005, 06:03 PM   #4
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CAI and get some exhaust work done Headers Hi flo cat and mufferlers will get you what your looking for
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Old 01-17-2005, 08:44 PM   #5
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It'll help, but not much.
That'* the price you pay for driving a 5,000lb vehicle.
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Old 01-18-2005, 09:26 AM   #6
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Quote:
Originally Posted by GonneVille
It'll help, but not much.
That'* the price you pay for driving a 5,000lb vehicle.
Gee thanks....

CAI and Thermostat it is...
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Old 01-18-2005, 09:38 AM   #7
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Don't forget the exhaust, just got to get it to breathe better than stock
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Old 01-18-2005, 12:08 PM   #8
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My parents own a 2004 Trailblazer with the same powerplant...with a KN filter and upgraded exhaust (hiflow cat, muffler) they saw about a 2-3mpg increase...not a whole lot but it does help.
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