Why the difference in year models? - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 6 (permalink) Old 05-03-2010, 11:42 AM Thread Starter
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Why the difference in year models?

Hi i was searching on internet, looking for some Hemi 5.7 specs, and i just found that the models 2009 have 388 hp, and my 2006 have 330, what can be the difference?, some mods that we can make, i already running KN CAI, Magnaflow Exaust, im planning to add the Diablo Trinity but i dont know if am close to the 388?
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post #2 of 6 (permalink) Old 05-03-2010, 12:15 PM
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I think most of the time it's computer upgrades that make the engine push more gas maybe or does something with RPM curve that gives it a better power band. They might have also increased the in and out air like you already did. The only way for you to tell what you have is to get it dynoed. You should be able to find a shop that does it for around $50.
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post #3 of 6 (permalink) Old 05-03-2010, 03:01 PM
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I heard that in 2008 on the 4.7L V8s they added a second spark plug at the bottom of each cylinder to ignite any unburned fuel or something - which increased the HP from 235 to 305...maybe they did something similar with the Hemi.
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post #4 of 6 (permalink) Old 05-03-2010, 04:55 PM
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Here::::::

Quote:
Variable cam timing was introduced for the 2009 model year, increasing efficiency. Other changes include a higher compression ratio; higher-flowing heads, intake, and exhaust; and an active intake manifold that switches from long runners to short runners, to optimize the engine for either better high-end horsepower or better low-end torque. Other upgrades are crankshaft structural upgrades, a dual-mass crankshaft damper, floating pin piston design, valve spring design, and oil pump capacity increase.
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post #5 of 6 (permalink) Old 05-04-2010, 11:42 AM Thread Starter
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Ohhh, thanks i think are difficult to make , also can i had some performance parts from the jeep cheroke, because im searching stores on line, to make performance parts, and i found huge more for cheroke, all the engine are the same?
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post #6 of 6 (permalink) Old 05-04-2010, 11:46 AM
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I believe the hemi already has 16 spark plugs.
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