Overkill Motorsports Products

Product Listing -- Overkill 5.3 LS4 V8 Computer Reprogramming

Overkill 5.3 LS4 V8 Computer Reprogramming
Description:

Fits: 2006-2009 Chevrolet Impala SS, 2006-2007 Monte Carlo SS, 2005-2008 Pontiac Grand Prix GXP, 2008 Buick Allure/LaCrosse Super.

Description:

The engine/transmission computer calibration is vital to the performance, efficiency and overall enjoyment of your vehicle!

We are pleased to offer our Overkill 5.3 LS4 V8 ECM/TCM, an extensive refinement and revision to the control modules that manage the engine and transmission in your newer GM front drive V8 vehicle.

The LS4 is the pinnacle of the W-Body platform and we're very excited whenever we deal with a LS4 V8 Grand Prix or SS customer. You've bought a performance family sedan, and perhaps you're looking for more. Our improved controller settings focus on improving power output and acceleration, improving the longevity and behaviour of the transmission, improving fuel economy in all driving conditions and providing an immediately noticeable improvement in how the vehicle drives. Your LS4 will feel much more responsive, less lethargic, and more fun to drive, and you'll be surprised to find an improvement in fuel economy with appropriate driving. Whether you're an enthusiast car owner or consider yourself a normal car owner, these are differences you'll be able to feel and enjoy!

Features/Benefits:

Engine
  • Retuned Spark Advance under all conditions to increase efficiency, improved power, smoother acceleration, more consistent performance in hot/cold temperatures, faster KR recovery rates
    • Spark Advance optimized for either 87 octane or 91+ octane
  • Revised Air/Fuel calibration to increase power under heavy throttle and reduce fuel consumption
  • Reduced "Torque Management", removal of power limiters, removal of performance fueling delays, removal of throttle delays and dead spots, reduced dead pedal feel
    • Displacement On Demand revised with optimized on/off calibration and highway use (4th gear) only
  • Increased fuel mileage capability: revised spark advance and revised variable valve timing (on 07+) increases efficiency, reduced fuel use under heavy throttle, recalibrated part throttle fueling, revised transmission settings reduce driveline loss, and revised DoD settings improve its operation
Transmission
  • Optimized shift schedule at part throttle for increased performance
  • Improved shift feel, reduced shift time
  • Revised Torque Management retained to reduce engine power during upshift, reduce stress
  • Reduces driveline loss under cruise to increase throttle response, improve MPG
  • Reduces/eliminates issues such as shudder from standstill, slip on 1-2 shift under heavy throttle, torque converter lockup oscillation, soft 2-3 shift
Additional
  • A/C shutoff over half throttle to increase power, smoother idle speed, speed limiter removal, rev limiter in park/neutral raised, revised cooling fan settings for stock thermostat (20-30*F cooler running engine/trans) with 1 minute key-off runtime, reduced traction control sensitivity, annoying loose gas cap SES light disabled


If your vehicle has aftermarket modifications, we've tuned hundreds of vehicle modification combinations and can make additions and revisions to enhance intake/exhaust and more extensive modifications such as headers and rockers. We also have specific timing tables to get the most out of either 87 octane or 91+ octane.

87 vs 91+ octane The LS4 V8 engine is modestly suceptible to engine knock/ping/preignition when compared to its peers. If you're purchasing a tune and looking for the most horsepower, we can do the most for you if you're willing to run 91+ octane. If you're purchasing for a noticeable performance increase during daily driving, improved transmission life and behaviour, and fuel economy, the 87 octane tune will provide the benefits you're looking for. With breathing modifications such as exhaust work and an intake system, 91+ octane benefits are available with 87 octane. If you do a lot of highway driving, running in DoD is noticeabley stronger with 91+ octane and will stay in 4-cylinder mode longer; if you do highway driving, you will see improved MPG using 91+ octane with DoD enabled over 87 octane in most cases and may find the additional MPG pays for the additional fuel cost.
Overkill 5.3 LS4 V8 Reprogrammed Computers - $199.99USD + New Lowered $145 refundable core charge ($25 flat rate UPS shipping to Canada and 48-state USA added at checkout)

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Select the octane fuel you wish to run
Enter Your VIN
Enter Vehicle's Modifications



Are you just interested in just an Overkill LS4 transmission tune for the proven improvement in reliability and performance it offers? Now offered separately from our ECM tune for those who've requested! This can be combined with other aftermarket tuning devices that don't change transmission settings or installed on your completely factory vehicle to fix/prevent common issues and increase performance.
Overkill LS4 Reprogrammed TCM (Transmission Control Module) ONLY - $79.99USD + $65 refundable core charge ($25 flat rate UPS shipping to Canada and 48-state USA added at checkout)

Select Your Vehicle



Want to send in your original computer modules instead? For those of you who'd like to keep your existing computer modules, or for those who just like a deal, we offer you a $50 discount if you send in your original computer modules to be reprogrammed. This means you'll receive an Overkill LS4 reprogram on your original computer modules for $149 plus $25 shipping. Again, the deal is, you take the original modules out of your vehicle, send them to us, we reprogram and send them back to you and you get the $50 discount on our services. You'll also avoid the core charge fee and the need to visit a mechanic to get a crank position sensor relearn (required when installing new computer modules in your vehicle). The downside is a little downtime on your vehicle. Modules are programmed and reshipped within 2 business days of receiving your computer modules.
Email us to take advantage of this special offer

Frequently Asked Questions

Q: So how does this work, what happens when I place an order?
A: We have a supply of used computer modules in stock. When you order, we select the computer module identical your vehicle's factory computer, and they are reprogrammed with our performance calibration. These computers are then mailed to you, to swap for your existing factory computer modules.
You then have the option to return your original computer modules for the core charge refund. We use your factory computer modules to reprogram to ship to someone else. If you wish to keep your factory computer modules, we use your refundable core charge to purchase replacements for our inventory.
You are responsible for your own shipping charges and for returning the computers within the alloted time of 45 days after ordering to recieve your refund. The computers will need to be undamaged and in working order or your refund may be reduced or denied.
You may be required to have a CASE or Crank Position Sensor Relearn performed to match the new computer module to your engine. This can be done at a GM dealer or independant shop with appropriate scantool and the average cost reported to us is $30.

Q: I've never purchased off the internet before, or I'm located in the United States and never purchased from another country before, what can I expect?
A: No problem. Our checkout system uses Paypal, a company owned by Ebay. Through paypal, you will enter your shipping details and can pay by credit card or a bank transfer. Your financial details are secure with paypal, they are not transmitted to us.
We love shipping to fellow Canadians but we do the majority of our online business with United States car enthusiasts. We ship primarily with UPS. Transit time takes 2-5 business days to anywhere in continental Canada or United States. We ship twice per week, your order will on average take 2-3 business days to ship. If we do not have your computers in inventory, we will email you, and please allow up to an additional 3-7 business days to procure the computers that match your vehicle.

Q: How does your performance calibration compare to others, why buy from you?
A: 1) Our attention to detail. Others can brag about a "dyno tune", but dyno tunes don't improve how the vehicle drives. Many dyno shops that dynos many different types of vehicles don't take any time to drive the vehicles on the street for hours, days or even weeks in order to find areas of improvement that will make the car more enjoyable to drive. We do, infact this is our primary focus. And we've been tuning the W-Body platform for years with all its powertrain options. Even though almost everyone may want that last 1 or 2 horsepower, almost everyone will be driving their cars daily under normal driving circumstances, and that's where improvements in our calibration over others will be very noticeable, moreso than the dyno graph folded up in your glovebox.
2) Other shops have tuned LSx motors for years but how many have tuned 4T65E transmissions for years? Very few, more than likely. How many "custom tunes" leave the transmission settings completely factory, because they don't have the experience to improve upon its settings? Very many, more than likely. Our first GXP computer tunes started off as a way to fix transmission issues such as shuddering from stoplights and slipping/banging at full throttle shifts, issues still apparent after several attempts to fix the transmissions under factory warranty. We've taken our extensive supercharged 3800 experience with the same 4T65E transmissions and applied them to the LS4 V8. The result is our calibration may fix transmission issues that you have, and may prevent them in the future.
3) The price.

Please Note: This aftermarket performance enhancing product is officially for "off-road" use only. Emission testing performance is not affected in most cases but we offer no guarantee of our tune being street-legal.
Please be advised there are no returns on these computers for any reason. If you do not like a specific aspect of our calibration, email us within 30 days of recieving and we can provide a retune of the computer we sent you at no retune charge, just pay shipping back to us and we will pay the shipping back to you. The computer module is warrantied for 90 days for replacement of the defective unit only with a similar unit.

Have a question about this product? Email us!

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