Increase HP or acceleration to 2006 Hummer H3.

mjferencak said:

PCM tune from pcmofnc

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RamRod said:

everyone here that has done the tune says its the best thing they ever did to their truck, I think its worth a shot

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Peep said:

I installed a cold air duct, helped me allott

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lloyd1402 said:

Hi everyone, can any of you suggest me some low cost ways to increase hp and acceleration on a L5 Hummer H3. The thing is that Ive been adding accesories that increase the weight of my Hummer, so I want to help him giving more hp. Some suggestions please.

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K0PIR said:

Low cost? It took me years but I added a CAI, better air filter, ported throttle body, Magnaflow cat back exhaust and PCM tune. Now I'm considering an electric fan and of course it'll be time to send the PCM back in for a re-tune I would do those things all over again if I had too.

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08H3 said:

Also, make sure you keep your expectations in check. This isn't a big block tire smoker and never will be.

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RamRod said:

.... speak for yourself... I have my truck pumping out over 400hp and could certainly smoke the tires if I trusted that the 4L60e could handle that sort of abuse

Just saying it's possible!

Sent from my SM-G935W8 using Tapatalk

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crwalkerasla said:

In addition to what has already been posted, take an afternoon to remove & THOROUGHLY clean the throttle body & MAF sensor. Then put in a fresh set of iridium plugs. The boost in response I felt from doing this was equal to that of the PCM Tune. Also, what octane fuel are you running? My '06 I5 got notably better mileage and response out of 89 oct (mid grade) than the cheaper 87 oct stuff.

Good luck with it.

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Peep said:

Someone told me to do this 2 years ago, and I did all three.....wow what a difference, cleaning and new plugs. Only one type of gas here so it had no effect to results, but my acceleration was up big time!

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GoBlueHummer said:

I've heard some success from guys that cut out a hole in the floorboard ala Fred Flintstone and are getting some good results off the line.

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humvee said:

I had the same issues with my i5, not enough power for my liking. The 3 makes so much commotion to get top to speed, and 50-80mph was a nightmare on 35s.
Other things you can do: stock-size lighter weight tires, no aftermarket wheels (stick to your 16" alloys).

After an aggressive PCM tune, Borla catback and a header installation, my 3s performance improved noticeably only at higher RPM, shaved 1 second off my 0-60. But by then it sounded like a jet. If you want power, you'll need an Alpha, V8 swap or the i5 supercharger... which costs as much as an Alpha upgrade.

No replacement for displacement (or something) - Good luck!

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GreatDaneHummer said:

I run an E fan, PCM tune, custom full exhaust, snorkel with K&N with new spark plugs and clean throttle body and picked up 10hp with the I-5. Basically don't get your hopes up for doing a bunch of bolt on products and getting it to be a speedy truck. With racks and all that stuff we all put on it turns into a heavy beast.

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GreatDaneHummer said:

I run an E fan, PCM tune, custom full exhaust, snorkel with K&N with new spark plugs and clean throttle body and picked up 10hp with the I-5. Basically don't get your hopes up for doing a bunch of bolt on products and getting it to be a speedy truck. With racks and all that stuff we all put on it turns into a heavy beast.

Click to expand...