**Performance chip for pickup**

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wes

New member
I have a 08 GMC 2500 HD and the gas mileage is really bad, I was wondering if performance chips really do work and if so what brand seems best ???
 
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skeeter2010

Member
I bought a OEM high performace computer for my 94 ram which required 93 octane I also added airaid intake I don't think it really made any differance. I think I would save my money for gas and not waste it on a performace chip just my 2 cents. This is coming from a guy that gets 8.5MPH on a good day.
The other recommendation I would have is to slow down I get my best gas milage is around 60-65 and it drops off significantly
 
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vic_junior

Member
Go to this site and check it out. www.stylinconcepts.com
They carry just about everything for adding performance to your truck. They have performance chips and tunners to adjust your fuel mapping so you can get better mileage. Just pick out one and do some homework to make sure it's reliable and easy to operate.
 
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tomxc700

New member
I put a K&N filter system (not just the filter) on my 2000 gmc 6.0 gas and gained 2.5 mpg cost 300 bucks but it has paid for its self many times over. Remember that truck is designed to haul/tow and not for mileage. So anything over 10 mpg with a gas 2500 your doing good.
 
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sleddog66

New member
Many chips for diesels work awsome. chips for gas only seem to advance the timing, and lean the fuel mixture, so you either have to run higher octane or you will have detionation problems. Think about it....The manufacteres already have most vehicals as lean as can be, so less fuel is just not good. Now that being said, if you are just looking for more power(It takes fuel to make power) Diesels have hugh increases, turbo charged gas engines can see some big increases, and other gas can see some slight increases.

If you have a gasser in you chevy, I would not waste my $$$. If it is a diesel, then I would go for it.
 
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zimmbob

Member
The GMC/Chev trucks after 06 get bad milage. It's because they moved to an electronic throttle body instead of the mechanical one. My 06 Chev gets 14 at best. My neighbor had an 04, and he would get 18 or 19. I chipped mine, and it didn't do any good. That was a hypertech chip.
 
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tomxc700

New member
zimmbob said:
The GMC/Chev trucks after 06 get bad milage. It's because they moved to an electronic throttle body instead of the mechanical one. My 06 Chev gets 14 at best. My neighbor had an 04, and he would get 18 or 19. I chipped mine, and it didn't do any good. That was a hypertech chip.
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Must be a half ton to get that kind of mileage.
 
M

man_scout

New member
Wes,

I have a JET Performance Programmer for my 04' 2500HD 6.0L with a K&N Air Intake... don't waste your money like I did! I've played with shift points and haven't found any difference. The only positive is that I was able to match the speedometer with the oversize tires.

If your 08' 2500HD is a 6.6L Diesel, then it's a whole different ball game and the possibilities are endless as to the performance it can put out.

Good Luck!
 
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hootieboy1

New member
just to make sure u know any chip u put in or any programmer you buy will very possibly void your warrenty unless u take it out before going to dealer. and if it is the diesel the bully dog chips are very handy
 
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wes

New member
We went out to the snowies 2 weeks ago, we pulled a 4 place enclosed with 4 sleds we ran about 65-70mph and we averaged under 8 mpg,(gasoline) I was really hoping to get 10mpg or better. So i would really like to find a way to increase my mpg a few.

oh yea the snowies were awsome it snowed all weekend,endless powder


Thanks guys
 
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sleddog66

New member
8 mpg with a gasser pulling a 4 place enclosed? I would say consider yourself lucky. If you want to do better, get a diesel.
 
E

eao

Active member
Be wary of glowing testimonials like, I changed my air filter to a K&N and gained 2 mpg. Anecdotal evidence based on the experiences of buyers of the product is insufficient to support claims of increased mpg.


For more details, refer to bulletins 08-06-04-033 (Gasoline Engines) and 08-06-04-006A (Diesel Engines).

General Motors is identifying an increasing number of engine, transmission and catalytic converter part failures that are the result of non GM - aftermarket engine and transmission control calibrations being used.

When alteration to the GM released engine or transmission control calibrations occurs, it subjects powertrain and driveline components (engine, transmission, transfer case, driveshaft and rear axle) to stresses that were not tested by General Motors. It is because of these unknown stresses, and the potential to alter reliability, durability and emissions performance, that GM has adopted a policy to cancel any remaining warranty coverage to the powertrain and driveline components, whenever the presence of a non-GM / aftermarket calibration is confirmed -- even if the non-GM control module calibration is subsequently removed.

Warranty coverage is based on the equipment and calibrations that were released on the vehicle at time of sale, or subsequently updated by GM. That's because GM testing and validation matches the calibration to a host of criteria that are essential to assure reliability, durability and emissions performance over the life of the warranty coverage and beyond. Stresses resulting from calibrations different than those tested and released by GM can damage or weaken components, leading to poor performance and or shortened life.

Additionally; non-GM-issued aftermarket engine control modifications often do not meet the same emissions performance standards as GM-issued calibrations. Depending on state statutes, individuals who install engine control module calibrations that put the vehicle outside the parameters of emissions certification standards may be subject to fines and / or penalties.

GM service bulletins 08-06-04-033 and 08-06-04-006 outline procedures to identify the presence of non-GM / aftermarket calibrations. GM recommends performing this check whenever a hard part failure is seen on internal engine or transmission components, or before an engine assembly or transmission assembly is being replaced under warranty. It is also recommended that the engine calibration verification procedure be performed whenever diagnostics indicate that catalytic converter replacement is indicated.

In February 2009, PQC will begin piloting a process to confirm the ECM calibration is GM-issued. Beginning in February, PQC will require a picture of the engine calibration verification screen, as outlined in the bulletin, before authorizing any V8 engine replacement (both Gas and Diesel). (

If a non-GM calibration is detected by the dealership, follow the procedures outlined in the bulletin. Once documentation of the non-GM calibration has been received, and verification has taken place through GM, the remaining powertrain and driveline warranty will be cancelled and noted in VISS, and the dealership will receive the following notification:

Based on information that has been received, please inform the customer that the Powertrain portion of the New Vehicle Warranty is no longer in effect for the engine, transmission, driveline and rear axle on VIN XXXXXXXXXXXXXXXXX, due to the presence of non-GM calibrations and / or equipment. The stresses resulting from the non-GM calibrations and / or equipment were not validated by GM and therefore cannot be warranted on any components that are subject to those stresses. Repairs to powertrain or driveline components that may currently require repair should not be covered under the terms of the new vehicle warranty. The warranty group has been advised of this information and VISS will be updated accordingly.
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