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5688 messages,  Last post on Oct 17, 2006 at 8:34 PM

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What is this discussion about? Chevrolet Silverado 1500, Chevrolet Silverado 2500, Chevrolet Silverado 3500, GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 3500, Truck

#5038 of 5688 IF I HAD TO BUY AGAIN by geo9 Jun 28, 2005 (11:17 pm)
I would purchase the Diablo Preditor instead of the Hypertech 3. It does have a program to modify the torque mgmt. from factory settings to complete off. Along with the usual tire sizes, shift firmness, RPM limiter, top speed, reg. or prem. gas etc.like the Hypertech does.................. Priced just under $400 am.   A PCM burn is another option. The only problem I see with those is price (Westers $500 or so). But the tune you order is the tune you get. No option to change settings at will or send it back and pay addl. $$ for a change. Plus the dealer can "see" the burned PCM tune with their machine poss. causing you warranty issues...............   Another way out is to have the dealer reprogram your truck for the different tire size. But thats gonna cost $100 ? bucks anyhoo...................   Open up your e-mail addy and i can send ya the scoop on torque mgmt. GM sees fit to put a restrictive torque mgmt. program in their 6.0-8.1 motors to prevent abuse and from what I have read to nurse them thru the warranty period.................................... Replies to this message: jerrywimer (Jun 29, 2005 5:09 am)
#5039 of 5688 Re: IF I HAD TO BUY AGAIN [geo9] by jerrywimer Jun 29, 2005 (5:09 am)
Replying to: geo9 (Jun 28, 2005 11:17 pm) I don't believe the dealer can see the burned PCM tune (going by posts from dealer techs on a few other forums). But GM is also using torque management on most if not all of their vehicles now, and that includes the 4200 in Trailblazers, as well as the 1/2 ton trucks with the 4.8 and 5.3 (not certain about the 4.3 yet though). It's supposedly there to serve a couple purposes, including providing a "smooth" / soft shift feel that many folks seem to prefer and helping to extend transmission life by limiting the amount of actual torque the engine can send to the transmission at any given time (especially "abuse" mode type sudden hard acceleration events, etc.).
#5040 of 5688 Torque Management by white6 Jun 29, 2005 (5:54 am)
Seems more than a little suspect to me. It's like, "Sure, we're gonna give you all this horsepower and torque, just don't use it!" My guess is that the transmissions obviously aren't keeping up with the power output increases. My 04 GTO would literally fall on it's face after every shift. What's the point of having the power if the computer won't allow you to access it? Hopefully this will be addressed with the next generation of 6-speed auto trannys. I keep telling myself that the current A4's were designed in the days of 170 hp 5.7 engines. Replies to this message: jerrywimer (Jun 29, 2005 7:10 am)
#5041 of 5688 Re: Torque Management [white6] by jerrywimer Jun 29, 2005 (7:10 am)
Replying to: white6 (Jun 29, 2005 5:54 am) That pretty much fits with everything I've seen and read about the issue.
#5042 of 5688 WHITE by geo9 Jun 29, 2005 (11:09 pm)
There is a great post elsewhere explaining how and why torque mgmt. works in these new GM v-8s................   Reading that the GM 6.0 actually retards the timing at WOT and certain RPM ranges. Explains why these auto equipped vehicles seem to fall on their face at times..............   A PCM burn or certain handheld tuners will solve THAT problem !!!!!!!!!!!!!!   I also note there is a gas guzzler tax on the new Caddy CTS-V for 05 !   JERRY W..................The fancy GM tech machine at the dealer CAN indeed tell if the PCM has been reburned, updated, etc........................ according to a GM tech/mechanic poster at another GM truck forum Replies to this message: bbkg (Jan 05, 2006 4:17 am)
#5043 of 5688 3.42 vs 3.73 gear by woodyv Jun 30, 2005 (5:57 am)
Just traded '03 ext cab, 2wd, 5.3 for '05 equipped the same way but just noticed that the '05 has the 3.73 gear and my '03 had the 3.42. I was getting 19-20 hwy mpg with the '03 and am now wondering how much the mpg will drop with the 3.73 gear. Any thoughts? Thanks, Replies to this message: rayt2 (Jun 30, 2005 7:08 am) txyank1 (Jul 01, 2005 9:59 am) delrick (Jul 02, 2005 3:27 pm)
#5044 of 5688 Re: 3.42 vs 3.73 gear [woodyv] by rayt2 Jun 30, 2005 (7:08 am)
Replying to: woodyv (Jun 30, 2005 5:57 am) My guess is it won't be what the window sticker says. My 00 2500 x-cab 2wd w/5.3 & 3:73 rear has never gotten better than 16mpg since new on a trip, now it gets 15 at best, window sticker said 17 to 19 mpg highway, it was a laugh. Currently 57k on odometer and still slapping itself with the piston slap issue although I no longer worry about it. I just tell my friends when the 5.3 grows up it wants to be a Duramax in its next life.....LOL !
#5045 of 5688 lift kit by london21 Jun 29, 2005 (12:46 pm)
I've got a regular extended cab 2000 silverado, and i was wanting to lift it to match the heigth of a z-71, does anyone know how much i need to lift it? i figured it wasnt much and i could do it with blocks instead of getting a "lift kit" thanks Replies to this message: sebring95 (Jul 01, 2005 4:39 am)
#5046 of 5688 Re: gas & gears... [dadoftay] by obyone Jun 30, 2005 (7:48 pm)
Replying to: dadoftay (Jun 27, 2005 4:47 pm) When I was shopping for a '05 rado I was surprised to see the gear ratio on the sticker listed at 3.23 rather than the 3.73 which I was used to seeing. At the time I had thought that 3.42 was the "highest" ratio you could get. Life is full of surprises...... Replies to this message: txyank1 (Jul 01, 2005 9:52 am)
#5047 of 5688 Re: lift kit [london21] by sebring95 Jul 01, 2005 (4:39 am)
Replying to: london21 (Jun 29, 2005 12:46 pm) Is the Z71 actually taller?? I've never noticed, and if so the difference has to be minimal. I know on the new models, the only difference in suspensions is jounce bumpers, stiffer shocks, and bigger tires. Just going from the 245's to 265's will gain you about an inch. I swapped the Z71 shocks and 265's onto mine and I don't see any real height difference compared to actual Z71 models.

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