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Go Back   Hummer Forums by Elcova > Hummer H2 Discussion Forums > The Woodshed

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  #1  
Old 03-08-2007, 07:04 PM
Sewie Sewie is offline
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Default Re: Great results from PCM for Less tuning . . .

Quote:
Originally Posted by H3.007
Are the 315s 33" or 35"?


315's are ~35"
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  #2  
Old 03-08-2007, 07:30 PM
H3.007 H3.007 is offline
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Default Re: Great results from PCM for Less tuning . . .

Thought so but wanted to be sure! Thanks Sewie!

What MPG were you gettin before Westhillsat?
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  #3  
Old 03-08-2007, 08:27 PM
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Default Re: Great results from PCM for Less tuning . . .

Before with the 33" I was getting between 12 - 14 mpg, even on my first H3 with 32" I never got above 14 mpg. Only once when I drove it home new, the first H3 base model did I get 17 mpg and that was driving 55 during the break in period.

I am using 88 octane, which in Montana is the middle grade.

Last night was only on the interstate, so no city driving between the
fillups.

I'm just happy that my mileage didn't go down, I have heard some people have taken a hit with the 35" tires in mpg's.
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  #4  
Old 03-08-2007, 09:54 PM
Steve - SanJose
 
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Default Re: Great results from PCM for Less tuning . . .

62 miles for a gas mileage check is not very useful at all. Still waiting for feedback on the PCM after a few hundred miles. Sounds promising.
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  #5  
Old 03-08-2007, 09:57 PM
rjmoose rjmoose is offline
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Default Re: Great results from PCM for Less tuning . . .

Quote:
Originally Posted by Steve - SanJose
62 miles for a gas mileage check is not very useful at all. Still waiting for feedback on the PCM after a few hundred miles. Sounds promising.

Ditto....what he said^^^^^^
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Old 03-09-2007, 12:28 AM
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Default Re: Great results from PCM for Less tuning . . .

Quote:
Originally Posted by Steve - SanJose
62 miles for a gas mileage check is not very useful at all. Still waiting for feedback on the PCM after a few hundred miles. Sounds promising.

I have put 1,600 miles on my H3 since the PCMforless upgrade. I have 315/75-16 BFG MTs with 35psi all around. Average highway mileage is 15.6mpg and back and forth in town is 14mpg. I drive back and forth from Morristown, NJ to Providence RI regularly so have gone through many tanks of gas and my mileage has been pretty consistent after the first tank.
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Old 03-09-2007, 07:57 AM
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Default Re: Great results from PCM for Less tuning . . .

I put in my reprogramed PCM Tuesday. Tonight I put in fuel. After 187 miles, I was able to squeeze in 9.6 gallons. You do the math.
Most of this winter I was running between 17.5 and 18.5.

My opinion; Truck runs easier on the highway. Takes off better and shifts cleaner. I'm happy I did it.
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Old 03-12-2007, 05:23 AM
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Default Re: Great results from PCM for Less tuning . . .

I took a trip over to Helena from Great Falls. Just to put my drive in perspective Great Falls is over 3,300 ft in elevation and Helena is just over 4,000 ft. To get to Helena you have to cross the mountains, so I would say I was climbing some grades that ended up being 4,500 -5,000 ft. The shifting was great going through the mountains on the interstate.

On the way over I was getting alot of head wind also, the wind was probably at least 40 mph coming head on. Had that wonderful flapping with the marker lights. The wind is blowing 30 mph outside now.

I did 173 miles and got 14 mpg with the 315 tires. I have a little over 312 miles on the pcm now.
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Old 03-12-2007, 05:57 AM
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Default Re: Great results from PCM for Less tuning . . .

Quote:
Originally Posted by deserth3
I put in my reprogramed PCM Tuesday. Tonight I put in fuel. After 187 miles, I was able to squeeze in 9.6 gallons. You do the math.
Most of this winter I was running between 17.5 and 18.5.

My opinion; Truck runs easier on the highway. Takes off better and shifts cleaner. I'm happy I did it.

Mind sharing what you had it set for?
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Old 03-21-2007, 07:05 PM
A.Anderson A.Anderson is offline
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Default Re: Great results from PCM for Less tuning . . .

Quote:
Originally Posted by deserth3
I put in my reprogramed PCM Tuesday. Tonight I put in fuel. After 187 miles, I was able to squeeze in 9.6 gallons. You do the math.
Most of this winter I was running between 17.5 and 18.5.

My opinion; Truck runs easier on the highway. Takes off better and shifts cleaner. I'm happy I did it.


Thanks for the feedback. I'm very glad you like it!
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