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

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  #1  
Old 02-21-2007, 06:52 AM
HummBebe HummBebe is offline
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Default Re: Great results from PCM for Less tuning . . .

Quote:
Originally Posted by keliente
You will see graphs from the colorado/canyon, which shares the same engine. Your problem with the H3 is that the AWD is going to eat up a little more power, but that doesn't mean great gains can't be had. Like I said before...this isn't just like bolting on an exhaust and getting 10 hp and a cool sound at wide open throttle. This is something that benefits you during your entire drive cycle, whether you've got it matted to the floor or not.


Awwww man, I almost went for it. Until I read this paragraph.

First the H3 is not AWD. There is a difference. PCM for less AND Rancho need to get this right before you will get an ounce of respect from me.

Splitting hairs....maybe.

Colorado/Canyon share the same engine, but from the factory they are tuned differently.

YOUR LINK IS TO A 2-3 YEAR OLD CANYON TUNE.

Please provide an updated tune...in private if you must.

teh proof is in teh puddin'.
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  #2  
Old 02-23-2007, 04:10 AM
keliente
 
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Default Re: Great results from PCM for Less tuning . . .

Quote:
Originally Posted by HummBebe
Awwww man, I almost went for it. Until I read this paragraph.

First the H3 is not AWD. There is a difference. PCM for less AND Rancho need to get this right before you will get an ounce of respect from me.

Splitting hairs....maybe.

Colorado/Canyon share the same engine, but from the factory they are tuned differently.

YOUR LINK IS TO A 2-3 YEAR OLD CANYON TUNE.

Please provide an updated tune...in private if you must.

teh proof is in teh puddin'.

You're right - it is in 'teh puddin'. Look how many satisfied customers I have on this board and I don't even sponsor it yet
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  #3  
Old 02-23-2007, 04:28 AM
HummBebe HummBebe is offline
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Default Re: Great results from PCM for Less tuning . . .

Nice....so no updated tune? Even a PM?
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  #4  
Old 02-23-2007, 04:29 AM
HummBebe HummBebe is offline
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Default Re: Great results from PCM for Less tuning . . .

Can you factor in an additional 500lbs in gear?
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  #5  
Old 02-23-2007, 05:18 AM
keliente
 
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Default Re: Great results from PCM for Less tuning . . .

Quote:
Originally Posted by HummBebe
Nice....so no updated tune? Even a PM?

I'm not sure what you mean by updated tune? I do each one as it comes in?
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  #6  
Old 02-23-2007, 06:15 AM
HummBebe HummBebe is offline
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Default Re: Great results from PCM for Less tuning . . .

Meaning a graph with all those little squiggly lines on it..., that was done for an H3. Recently.

I can understand if you don't want to share proprietary information with the whole whirrled.

What about changing the shift points for hauling around a set of 35's, a roof rack, front winch bumper, winch, rock rail-side steps, 2 roof ladders and a rear bumper?

Can it do that? I'm really curious, I'm a girl, you know.....kinda dumb when it comes to all this techie stuff.
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  #7  
Old 02-23-2007, 07:20 AM
Steve - SanJose
 
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Default Re: Great results from PCM for Less tuning . . .

Let's see it please. Nothing proprietary about the graph requested.
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  #8  
Old 02-23-2007, 04:04 PM
keliente
 
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Default Re: Great results from PCM for Less tuning . . .

Quote:
Originally Posted by HummBebe
Meaning a graph with all those little squiggly lines on it..., that was done for an H3. Recently.

I can understand if you don't want to share proprietary information with the whole whirrled.

What about changing the shift points for hauling around a set of 35's, a roof rack, front winch bumper, winch, rock rail-side steps, 2 roof ladders and a rear bumper?

Can it do that? I'm really curious, I'm a girl, you know.....kinda dumb when it comes to all this techie stuff.

Yes...the shift points are a large part of what we are doing with the transmission tuning. Some of our people on here have the 35's with the tune and tell us it makes a substantial difference.

I do not have any recent H3 graphs, sorry. The majority of truck folks (all trucks, not just H3) that stop by in person to get a tune aren't interested in ponying up the extra cash to get on the dyno. They want the seat of the pants difference...noticeable power, better shifting, etc etc and aren't really interested in knowing what it makes on the dyno.
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  #9  
Old 02-24-2007, 02:57 AM
ChevyHighPerformance ChevyHighPerformance is offline
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Default Re: Great results from PCM for Less tuning . . .

Quote:
Originally Posted by HummBebe
Meaning a graph with all those little squiggly lines on it..., that was done for an H3. Recently.

I can understand if you don't want to share proprietary information with the whole whirrled.

What about changing the shift points for hauling around a set of 35's, a roof rack, front winch bumper, winch, rock rail-side steps, 2 roof ladders and a rear bumper?

Can it do that? I'm really curious, I'm a girl, you know.....kinda dumb when it comes to all this techie stuff.

I just looked at the stock PCM program for the 04, 05, 06 colorado I5 and the 06 H3. The high octane timing table is essentially the same (there are very small differences at low RPMs and low cylinder airmass) for all these vehicles/years. The WOT timing is identical. The commanded air/fuel ratio is identical. The timing and the A/F ratio are the major items that control engine performance. I would look at this 04 Canyon dyno curve and ratio the performance gain.

http://www.pcmforless.com/images/dyn...s/04Canyon.jpg

Stock 166 HP, tuned 182 HP -> ~10% increase in peak power

Stock 174 TQ, tuned 188 TQ -> ~8% increase in peak torque

It's reasonable to assume that the H3 would gain 10% HP and 8% torque with the same tune and octane fuel. This would make the 06's 220 HP -> ~ 242 HP about same as the 3.7L 2007.

The percenatage gain at the wheels would be the same, but the actual gain (delta HP gain) would be less since we have more drivetrain loss than the colorado/canyon. So, the 04 Canyon's HP gain of 16 HP at the wheels might be ~13 HP at the wheels for the H3.

A region that doesn't show up on the dyno plots is the off-idle power/torque. The custom tune really helps in this low RPM range but the range is rarely dyno'd (only felt by the seat-of-the-pants).

The other benefits of the custom tune are better idle quality, better auto tranny shifting RPM/speed and firmness, and many people see an improvement in MPG.

I think PCMforLess has a dynojet (front or rear wheels only) but not a 4-wheel dyno. 4-wheel dynos are expensive and pretty rare to come by and expensive. The problem is that not all wheelbases are the same so it becomes a business return-on-investment issue to buy a 4-wheel dyno. When I was publishing truck articles, I think I was the only person that could dyno an all-wheel drive/4-wheel drive vehicle within my state and all the nearby states.

I wouldn't take the lack of a dyno as something bad.
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  #10  
Old 02-24-2007, 03:08 AM
HummBebe HummBebe is offline
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Default Re: Great results from PCM for Less tuning . . .

Thanks.
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