1. #1
    snoopy4x4's Avatar
    snoopy4x4 is offline Junior Member
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    Remapping KK software

    Hi all

    I am looking at having the software on my 2012 Jeep Liberty/Cherokee KK 3.7L V6 remapped to improve fuel consumption. Currently averaging 18 to 18.5L/100km.
    Iím in Cape Town and I have a brilliant indy who has suggested remapping (not a chip).
    Iím going into this understanding that there is not a 100% guarantee that I will experience a huge reduction in consumption. But I am willing to give it a try.

    Does anyone have experience or knowledge of doing this on a 3.7L V6?
    And if so, please share.

    Thanks


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  2. #2
    JPNinPA's Avatar
    JPNinPA is offline Senior Member
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    Re: Remapping KK software

    So I recalc that as ~13 mi per gallon.
    Do you have a lift?
    Larger tires?
    Rehearsed rears?
    Corrected speedometer for the above?
    We need to be sure your calculating the true L/km

    Second the only success in improving mpg was changing from a mechanical fan to an e-fan. On a Daily Driver. Other mods are relearned by the PCM anger. Few hundred miles.


    Regards,
    JPNinPA

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  3. #3
    snoopy4x4's Avatar
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    Re: Remapping KK software

    Quote Originally Posted by JPNinPA View Post
    So I recalc that as ~13 mi per gallon.
    Do you have a lift?
    Larger tires?
    Rehearsed rears?
    Corrected speedometer for the above?
    We need to be sure your calculating the true L/km

    Second the only success in improving mpg was changing from a mechanical fan to an e-fan. On a Daily Driver. Other mods are relearned by the PCM anger. Few hundred miles.


    Regards,
    JPNinPA

    Sent using TapTalk
    I donít have a lift yet. Doing that in July. Can only do a 2Ē lift on the KK.
    Tyres are 245/70R16 Good Year Wrangler Adventure All Terrains.
    Not sure what you mean by ďrehearsed rearsĒ
    Speedometer hasnít been touched.


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  4. #4
    JPNinPA's Avatar
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    Re: Remapping KK software

    Oh sorry. Autocorrect picked a word and I didn't see the change.
    Re geared the axels.

    Your tire (tyre) diameter is 29.5 in and that is the stock size.




    JPNinPA
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  5. #5
    JPNinPA's Avatar
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    Remapping KK software

    So you have a stock liberty. So when you do lift it and change tire size to larger then stock, the mpg or km/L is going to get worse.
    Stock was 16mpg city and 22 highway. 15/21 in the 4x4 model. The engine is a 3.7 L V6.
    So in my experience( not on 3.7) tuning trades HP with efficiency.
    Unless you reduce load or increase CC and or turbo. Reducing load can be eliminating A/C, mechanical fan to an e-fan, convert auto manual locking or 4x4 to fwd.


    What you may want to start with is a good tune up.
    Proper tyre pressure.
    Balanced aligned
    Brakes not dragging
    Clean TB and IAC
    Clean grounds and power connections
    Clean air filter.
    Remove weight from vehicle.
    Easy on the skinny pedal and coast more to stop. Keep it under 65mph


    JPNinPA
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    Last edited by JPNinPA; 06-06-2018 at 09:57 PM.
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  6. #6
    snoopy4x4's Avatar
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    Re: Remapping KK software

    Quote Originally Posted by JPNinPA View Post
    So you have a stock liberty. So when you do lift it and change tire size to larger then stock, the mpg or km/L is going to get worse.
    Stock was 16mpg city and 22 highway. 15/21 in the 4x4 model. The engine is a 3.7 L V6.
    So in my experience( not on 3.7) tuning trades HP with efficiency.
    Unless you reduce load or increase CC and or turbo. Reducing load can be eliminating A/C, mechanical fan to an e-fan, convert auto manual locking or 4x4 to fwd.


    What you may want to start with is a good tune up.
    Proper tyre pressure.
    Balanced aligned
    Brakes not dragging
    Clean TB and IAC
    Clean grounds and power connections
    Clean air filter.
    Remove weight from vehicle.
    Easy on the skinny pedal and coast more to stop. Keep it under 65mph


    JPNinPA
    Using Jeepz.com app
    Thanks for all the information.
    So at the moment, it looks like my fuel consumption is spot on. 16mpg = 18L/100km (I think). Good to know.
    Would you do the remapping if you were me?


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  7. #7
    JPNinPA's Avatar
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    Re: Remapping KK software

    Your at 13 mpg not 16. 16 is what is expected.

    No I would not remap. As mentioned you are going to train off hp for economy and likely loose mpg in the long run. The only way I know to get more hp and economy is to either increase the CC of the engine, put on a turbo (if it makes sense for that engine) or remove restrictions that rob power. Mechanical clutch fans, A/C ... That use the engine as its PM.

    Sometimes you could change where end engine shifts. Less aggressive can be better mpg.


    Regards,
    JPNinPA

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    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  8. #8
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    Re: Remapping KK software

    With all the stuff mentioned above, you could do a pedal commander. It has an econo mode. although the econo mode is less pedal feel than stoc generally. But, city would give you more get up and go for less pedal use. Might help. Better option than remapping.
    Allen's Offroad - 530-620-1100
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