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Old 02-06-2013, 10:48 PM
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2011 Overland w/ Mods - Do I need a calibration?

I bought a used 2011 Grand Cherokee Overland Summit last summer. Had 22K on it. Came with offroad package (18' tires). I do not really have much car experience but I know exhaust, air intake, chip etc. can give your ride that warm and fuzzy feeling. I installed a Corsa Cat Back, Volant Intake w/ Donaldson Filter and Jet Performance Chip last fall. Def changed things up a bit. Only thing is my low end acceleration is def a bit off. When I first get on it and it shifts I get a small hesitation and then like a small booming noise and it shifts weird. After this it seems to shift better in the higher gears when i get on it. Only thing I can think of is it needs a proper tuning/calibration for the mods I did. I put the jet chip in hoping this would fix it and it did slightly but still would like smoother shifting. The mods are on properly figuring stuff like that out I am fairly good at its just how they actually all come together is where my brain stops working. Maybe this is just how it is supposed to be I do not know. Any suggestions would be helpful. Thanks
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Old 02-07-2013, 01:31 AM
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Josh,
I think you have to do some kinda battery disconnect then a transmission "relearn" on these type vehicles when doing mods. On my Ram I have to do something similar for the truck to take advantage of the mods... Dang smart vehicles...
Ch

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Old 02-07-2013, 09:58 AM
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Re: 2011 Overland w/ Mods - Do I need a calibration?

V8 I assume?

The new ECUs just adjust (continuously) to your mods and bring performance and emissions pretty much back to stock. There is a placebo effect, you will see many reports from those that use butt dynos... (or salesmen) and there is nothing wrong for doing these mods for sound.. waste of $$ for any kind of performance.

Check out the Diablo threads for a tuning device that can modify the ECU programing. Not a whole lot you can do about shift smoothness, but I think you can adjust the shift points.

Mine runs pretty good when I put in sport mode, keep the transmission in 5 and driven with some spirit, feels like a different car than when simply driving normal and D... The ECU does adjust a bit to your driving style. Those that drive like you stole it will seem to have better performance.
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