Page Information Updated January 2020
Overkill was one of the original tuning outfits for the Chrysler 3.6 engine and I tune dozens every month. Your LX platform 3.6 vehicle can benefit from Overkill tuning, no matter of stock or highly modified! Overkill tuning revises many items from the factory Chrysler tuning, including spark timing advance, camshaft phasing, fuel targets, removing throttle and fuel enrichment delays and revising torque management interventions.
You will receive tuning files for several gasoline grades including 91,93, 87 and 89 octane, as well as running E85 ethanol if your vehicle is flex fuel equipped from factory (Check out our fuel injectors for maximizing E85 ethanol gains). With the HP Tuner suite, you'll also receive revisions to the transmission tune for either the 5 speed or 8 speed automatics, depending on your year
Independent tests have shows the Overkill tune doubles the performance gain over the preloaded Diablo tune using dynos or acceleration performance tests. One customer dyno tested the Overkill E85 Tune at 267whp vs 238whp from Diablo preloaded tune, a 29 wheel horsepower gain.
Features/Benefits:
- Gains of 15+ Horsepower on 87 octane tune, Dyno tested 25+ wheel horsepower gains on 91/93 octane, 30+ on E85 ethanol
- Tune purchase includes 87 octane, 91/93 octane and E85 ethanol tuning (if available) plus custom tuning based on scans for your vehicle
- Significant torque gains in the mid throttle, mid rpm range, perfect for these big sedans
- Improved throttle response and feel, smoother acceleration at all throttle positions
- Fuel mileage potential is improved (up to 3MPG improvements reported)
- Reprogramming available for other custom modifications including our fuel injectors below, 180* thermostat, intake systems and any exhaust modifications.
Important Note for 2015 and newer Tuning: For 2015 and newer Chryslers, a computer modification is required to become tunable. You must remove the computer from your vehicle and send it to HP Tuners for modification. This is a $250 charge that involves a separate transaction with HP Tuners, it is not through Overkill. There is no way around this!! I wish there was, blame FCA. Once you get back the computer module, Overkill will be able to write Overkill tunes using the now unlocked factory programming from HP Tuners. See more on this service here https://www.hptuners.com/product/pcm-modification-service/
Already have an HPTuner suite? You can purchase Overkill tune files with ongoing tuning support below, you'll get 87, 91 and 93 octane tunes programmed for your current modifications. You'll need to send a factory read file to willoverkill@gmail.com in order to receive back your Overkill tunes, once you've made your purchase below.
If you already have a Intune or Trinity from Diablosport, upgrade it by purchasing Overkill tuning. You'll get all the Overkill tune files that we include when buying the Diablo device from us, plus custom datalogging tuning services. Overkill tunes load to your vehicle just like the Diablosport preloaded tunes. Once purchased below, send both original backup and last tune written files from your handheld to willoverkill@gmail.com to receive your Overkill tunes back. You'll do this by plugging the device into your PC and you'll find a Tunes folder on the drive with the files that are needed.
If you want to run E85 ethanol, it's highly recommended to upgrade your fuel injectors. The factory units we've found they can max out their capacity as soon as 5500rpm, leaning out the engine beyond that point and robbing power. These 39# fuel injectors will provide the true capacity required run E85 and will improve horsepower at higher rpms while running E85. Once tuned you can run gasoline as well with no issues, but the gains are when running E85.
Tuning is required to install these injectors. They are genuine Bosch brand and a direct replacement to the factory injectors.
Want some improved performance from your Pentastar, here's my suggestion:
- Overkill Tuning - Not to toot my own horn but Overkill tuning truly is your best performance improvement; good gains on 87 octane, terrific gains on E85 ethanol or premium fuel, plus you'll see how it improves how the vehicle drives
- 180* Thermostat - If you get Overkill tuning, it's highly recommended to get the RIPP 180* thermostat. The factory 203* thermostat keeps the engine running pretty hot, you'll see improved performance with 20-25*F lower engine temps. Use part number 1215-180DEG to get a RIPP thermostat from Summit Racing. Tuning is required to reprogram the cooling fans and turn of the P0128 code.
- E85 39# injectors - If you run E85 ethanol and enjoy its performance benefits, get my 39# injector upgrade, I sell it for a reason! The factory injectors are small for flex fuel operation, you'll see noticable performance improvement above 5500rpm on E85 with proper sized fuel injectors. Tuning is required, again Overkill tuning or if you DIY tune I'll supply you the fuel injector data at no charge with purchase
- Air Intake - In particular, something that replaces the factory tubing to the air filter housing, as that's the restriction, not necessarily the filter housing itself.
- Ignition Coils - The factory Pentastar ignition coils are surprisingly poor. While I almost never recommend a coil upgrade based on past experience, the RIPP ignition coils for $300 for the set and we truly see a dyno tested 8-10 wheel horsepower improvement
- Lower Intake Manifold - Proper porting or replacing with the newest generation lower Pentastar manifold is worth a dyno tested 7-8 wheel horspower
- Ported or Larger Throttle Body - Leave the throttle body until last, but there's some gains with a factory throttle body that's been half shafted like the Fastman or a true larger throttle body like the Overkill 80mm or BBK, but ensure to avoid the fake "80mm" that's just a ported factory unit.
Want some easy horsepower? The lower intake manifold from the Pacifica's updated 3.6 Pentastar motor is an upgrade to older Pentastars. It features much smoother transitions and doesn't have the pinch area that we used to port out of the older Pentastar manifolds. Dyno tested, this is worth a quick and easy 10 horsepower improvement.
This manifold can be had using part number 5281803AA in the $130-150 range from a Chrysler parts supplier or your local dealership, just be patient if they're backordered. Since the fuel injectors are in the lower intake manifold, great chance to upgrade to the 39# injectors for E85 use while you're in there!
The Pentastar downpipes aren't too bad, with two notable exceptions. The driver's side has a flex pipe section that is a pinch area, easily visible. Cutting out and replacing with straight pipe will improve flow. Also, the connections to the cat-back neck down, so if you install a larger aftermarket cat-back, have these sections cut out and the cat-back connection redone without this reduction in pipe size. Don't forget to check if your 300/Charger has a single pipe cat-back, if so you'll see nice gains switching to a true dual pipe system.
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