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Go Back   Hummer Forums by Elcova > Hummer H3 Discussion Forums > Technical Discussion and Customizing your H3

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  #1  
Old 02-21-2007, 10:02 PM
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Default Re: Guys who went to 35's . . .

Quote:
Originally Posted by JWSchmidt3
Are you having any issues with, or does it seem your transmission shifts at much different intervals than from stock?? I had an Adv. H3, and I am currently driving a 2007 dealer loaner while my lifted H3 is at the dealer, and my suspician is confirmed. One of the issues I sent the H3 in for is the tranny shifting. It always wants to shift down to low gear way too early. Is this because of the 35's?? Is there any way to properly calibrate the bigger tires?? My truck drives like a turd compared to thos '07. BTW, I also have a CAI and exhaust installed. Any help appreciated, as the dealership has yet to give me any real hope.

I've had mine installed for less than 24 hours and I would highly recommend the PCM for less tune. Totally different beast with the 35's.
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  #2  
Old 02-26-2007, 04:37 AM
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Default Re: Guys who went to 35's . . .

another quick question. The about 7% difference in the speedo between the 32 inch stock tire and the 35 inch toyos, is that a linear diffrence or exponential? By that I mean if your speedo shows 65, then you are actually going 70, is the same true if it shows 15 the actual is 20 mph, or would it be different?

Also do you think that this difference (speedo 7% slower tahn actual) is enough to throw off an aftermarket nav (pioneer avic z1) which uses the speed pulse in doing its calculations?

also i didnt understand if the pcmfor less calibration of the pcm can calibrate the speedo for the 35s, can someone clarify that? I know they ask what tire you are ising but do they actually configure teh speedo?

thanks
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  #3  
Old 05-04-2007, 08:39 PM
JWSchmidt3 JWSchmidt3 is offline
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Default Re: Guys who went to 35's . . .

Quote:
Originally Posted by marin8703
also i didnt understand if the pcmfor less calibration of the pcm can calibrate the speedo for the 35s, can someone clarify that? I know they ask what tire you are ising but do they actually configure teh speedo?

thanks

Yes, they fix the speedo with their tune.
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  #4  
Old 05-04-2007, 09:50 PM
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Default Re: Guys who went to 35's . . .

JWS- you've had the new pcm for a couple of months now,,, how's it working?? I've had 35's on my truck for about 9months and would love to get my milage and proformance back,,,, I'm on the verge of going back to 33's
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  #5  
Old 05-10-2007, 08:10 AM
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Default Re: Guys who went to 35's . . .

Quote:
Originally Posted by HUMMJAY
JWS- you've had the new pcm for a couple of months now,,, how's it working?? I've had 35's on my truck for about 9months and would love to get my milage and proformance back,,,, I'm on the verge of going back to 33's

My 75 cents worth.

I love the pcm change along with my dual exhaust from Jason
I got the Billy Boat exhaust

http://www.somo.com/

Average 12 - 13 mpg with the 35's, but have no acceleration issues now
and shifts great.
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  #6  
Old 05-10-2007, 09:53 AM
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Default Re: Guys who went to 35's . . .

Quote:
Originally Posted by westhillsat

I love the pcm change along with my dual exhaust from Jason
I got the Billy Boat exhaust


Weshillsat

what does the billy boat exhaust sound like. is it like the stock exhaust ?
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  #7  
Old 05-20-2007, 12:35 AM
JWSchmidt3 JWSchmidt3 is offline
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Default Re: Guys who went to 35's . . .

Quote:
Originally Posted by HUMMJAY
JWS- you've had the new pcm for a couple of months now,,, how's it working?? I've had 35's on my truck for about 9months and would love to get my milage and proformance back,,,, I'm on the verge of going back to 33's

Works great. Couldn't be happier.

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2006 yellow H3 - Pro Comp Xtreme package
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2004 yellow Corvette Z06
2002 black LPE blown TigerShark Z06
http://public.fotki.com/JWSchmidt3/
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