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10-20-2003, 12:27 AM
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Hummer Expert
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Join Date: Nov 2002
Location: NYC
Posts: 884
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I just came back from a 500 mile round trip drive through Pennsylvania and I got 16.3 MPG on the highway and about 14 MPG over all. Not only am I getting good gas mileage but I think I feel a difference in my 2004 vs. a friend's 2003 with respect to torque and climbing hills. I heard that GM tweaked the engine in 2004 and think this is the case particularly given my experience on the gas mileage.
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H2 '04 Black
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10-20-2003, 12:27 AM
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Hummer Expert
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Join Date: Nov 2002
Location: NYC
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I just came back from a 500 mile round trip drive through Pennsylvania and I got 16.3 MPG on the highway and about 14 MPG over all. Not only am I getting good gas mileage but I think I feel a difference in my 2004 vs. a friend's 2003 with respect to torque and climbing hills. I heard that GM tweaked the engine in 2004 and think this is the case particularly given my experience on the gas mileage.
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H2 '04 Black
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10-20-2003, 09:14 AM
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Join Date: Nov 2002
Location: LAUREL, MS, USA
Posts: 102
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Do you feel a good difference or bad?
.
"Follow the white rabbit..." Morpheus 1999
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\"Follow the white rabbit...\" Morpheus 1999....... It is finished.
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10-20-2003, 11:44 AM
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Hummer Expert
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Join Date: Nov 2002
Location: NYC
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Good difference. It seems like there is more torque up hills and better acceleration from standing position. I don't know if this is just in my mind.
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H2 '04 Black
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10-20-2003, 12:25 PM
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Join Date: Oct 2003
Location: Indianapolis, IN
Posts: 440
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I read on the internet ( so it must be true), that they made some adjutments to the computer programing..This may account for the powerband shifts you are noticing...
I am waiting on my Hypertech III, whichis suppose to be in route.. With any luck it will give me a small boost.. I've gone the supercharger route on another GM product. Don't bellieve I will do it again..
Mike
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10-20-2003, 02:15 PM
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Hummer Guru
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Join Date: Nov 2002
Location: CSA
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Mike,
Where did you buy your Hypertech? I am interested in buying one to change the downshifting of the transmission (much too quick to downshift going up moderate grades with the cruise engaged).
Beware that there are 2 different models with the same part number. I received this email from Hypertech this morning:
<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>We have just released the programmer for the H2 recently and it is readily available. Part# 30019 is the correct unit, it must be a new 30019 before it will recognize the H2. An old 30019 off a shelf at one of our warehouses will not work. Thanks
Jim
<HR></BLOCKQUOTE>
Klaus
"God made some men big and some men small, but Sam Colt made them all equal."
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10-20-2003, 02:24 PM
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Hummer Guru
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Join Date: Nov 2002
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Sounds great Zazing! That would be good news.
I could just hear the engineers meeting now:
"Okay, I have an idea. Whatever the computer calculates for MPG, lets add +3 to the display!"
- Dan
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SUT on order 12/02. 10 months down, 8 to go!
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10-20-2003, 02:48 PM
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Join Date: Nov 2002
Location: LAUREL, MS, USA
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THANKS for the positive reply, Zazing.
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"Follow the white rabbit..." Morpheus 1999
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\"Follow the white rabbit...\" Morpheus 1999....... It is finished.
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10-20-2003, 05:45 PM
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Join Date: May 2003
Location: Austin, TX
Posts: 225
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Could be an air intake tuning, maybe better valve timing and springs. Hmmm. Glad you're enjoying it, Z!
Corvette= "The ability to pass with class"
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Skull & Bones Member since 2003 - H1 Forum Troll since 2004
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10-20-2003, 09:46 PM
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Join Date: Oct 2003
Location: Indianapolis, IN
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I called mfg. week ago to day. they state dproduct was in stock retail $439.95.. I went on line and I think the name of the company was access ??/.. Hell I can't remember.. will have to check charge card record.. ( Still isn't here ,however must come from Cal..).. THe cost with shipping was just under $315.00...
I've used one of these on the last 10 GM Trucks/SUV's...
Mike
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10-20-2003, 10:03 PM
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Join Date: Oct 2003
Location: Indianapolis, IN
Posts: 440
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OK I found it. www.accessconnect.com hope this works.. My short term memory seems to be fading.
Mike
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10-21-2003, 12:37 AM
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Hummer Expert
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Join Date: Nov 2002
Location: North Texas
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What is this about the 2004 being tuned (or improved programming) for better mpg and torque??? Is this true?? Let's hear some authoritative input.
Jim
Red H2
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Jim
2003 H2 Metallic Red (now gone)
2008 H3 Graphite Lux
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10-21-2003, 07:13 AM
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Join Date: Sep 2003
Location: Nashville, Tennessee
Posts: 160
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I have an 04 with 2700 miles on it. I do about 50/50 city/highway. Right now the computer says I am getting 11.4 Just an update for comparison.
Craig
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Craig
04 Pewter H2- Lux,nav, air suspension
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10-21-2003, 10:12 AM
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Join Date: Nov 2002
Location: Omaha, NE
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Would it be too much to ask GM to give the update to dealers so our "old" engines could be tweaked?
HA!!! Dan is probably right on...if not, he is at least "funny"!
Man, I didn't see 11.4 until I hit the 5,000 mile mark.
Ric
OMAHOG/IHOG
Hum2@cox.net
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10-21-2003, 05:23 PM
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Hummer Guru
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Join Date: Nov 2002
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More info from Hypertech:
<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Klaus
The units with the revision# 05-18-14-20 is the correct unit for the H2. The revision # is located on the back of the unit on the parts # label.
Hypertech by EPA law can not make adjustments to the shift points at part throttle. It will not help with the down shifting problem .
Jim
-----Original Message-----
From: Klaus
Sent: Tuesday, October 21, 2003 7:41 AM
To: techsupport
Subject: Re: ChipRequest
Importance: High
Thank you very much for your reply. Can you give me further details? I am
primarily interested in stopping the transmission from dropping down a gear
too quickly when the cruise control is on. Will the HPPIII help?
Also, since the part numbers are the same, how can I tell if the programmer
is one of the "new" units just by looking at it? I'd hate to buy one, bring
it home, connect it up, only to find it is the wrong unit. Many times,
electrical parts cannot be returned once used.
Thank you,
Klaus <HR></BLOCKQUOTE>
Klaus
"God made some men big and some men small, but Sam Colt made them all equal."
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10-21-2003, 07:54 PM
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Join Date: Jul 2003
Location: Kansas City, Mo. USA
Posts: 40
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I am getting pretty decent gas milage of 12.4 with my 2003. That is combination of city and highway. The only time I have noticed you can average 14 to 16 mpg is when you are traveling on a level road and going about 40 to 50 mph. I do however have the H2 reprogramed with a Predator, JBA shorties, Corsa Sport, and Nology wires.
2003 Pewter H2
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2003 Pewter H2
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10-21-2003, 08:10 PM
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Hummer Expert
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Join Date: Nov 2002
Location: North Texas
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I was getting about 12.2 avg in Dallas area. Now temporarily located in St. Louis area I am getting about 11.6 avg. (more hills). None of this could really be considered "highway" driving. I am at 12000+ miles and never noticed a measurable improvement after 5000 miles as some have reported.
Jim
Red H2
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Jim
2003 H2 Metallic Red (now gone)
2008 H3 Graphite Lux
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10-22-2003, 01:59 AM
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Join Date: Nov 2002
Location: Land of Enchantment
Posts: 230
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My 2003 has been solid at 13.0 mpg, now at 13,500 miles (no mods). Combination of city/hwy and when at hwy I run 70-75mph. I too only see 14-15 mpg when running at about 50 mph on level road. I consider 13.0 mpg to be just fine.
JJ
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10-26-2003, 08:18 PM
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Join Date: Feb 2003
Posts: 163
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Zazing & other 2004 owners:
Let's hear how you are doing with MPG!
I have a neighbor with a new 2004 - I'll ask as well.
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10-26-2003, 09:50 PM
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Join Date: Apr 2003
Location: Woodbury, MN
Posts: 385
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Lucky SOBs I have never seen 11 mpg. I have been getting about 10 before and after headers and Corsa. By the way I have a 2003.
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