Hummer H3 For the Hummer driver who wants the rugged look and off road capabilities of the Hummer, but in a smaller size and with a more fuel economy friendly engine.

Jet Performance Module

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  #21  
Old 05-21-2010, 07:54 AM
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Originally Posted by marksteven
Let's just say my h3 woke up from the dead with the jet module! However I am running 89 octane which is rec. By jet.
Whats the power difference between an 87 tune, 89 and 93 tune?? Is it big or marginal?

Originally Posted by Broken Halo
I was ready to pull the trigger on a Jet for my Alpha, so I contacted them directly and spoke to a tech. He said I could expect about 15hp. and 17ft.lbs. torque more. When I asked about increased mpg. he said not going to happen. I said that it seemed to me that, increasing the efficiency of the engine should equate into better mileage. He responded that, the way they get the increase in hp and torque, is to advance the timing, and increase the injector pulse duration. Bottom line: more fuel is used and mpg go DOWN!
Oh well....back to PCM for less.
I understand and agree with your way of thinking; more power= less throttle neccesary to get the vehicle moving and to sustain speed. I think if you really keep your foot outta it and drive it like normal (or babied in my case) mileage would almost certainly go up.
 
  #22  
Old 06-02-2011, 05:45 PM
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I just got my Jet Stage 2. Waiting in K&N series 63 cold air intake coming in the mail. do I NEED that or can I run out right now and install this thing? Anyone have a link to an engine diagram BTW. One with some detail? Anyone have a link to the actual process of installing the Jet PCM?
 
  #23  
Old 06-02-2011, 05:54 PM
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Must I have a cat back exhaust?
 
  #24  
Old 06-02-2011, 11:09 PM
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I got the Jet chip with intake and megnaflow pipes amazing difference with power; people do not believe the way i pass 5 to 6 car at a time on single lane also notice about 3 Mpg better with a heavy foot.
 
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