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-   -   JB4 2018 Wrangler JB4 (https://www.n54tech.com/forums/showthread.php?t=62566)

Ronmaf 07-05-2020 03:14 PM

JB4 2018 Wrangler JB4
 
Hi, I purchased the JB4 tuner and have noticed a sharp decrease in fuel economy. I am not dogging the engine at all I am driving normally as I was before I installed the JB4.
I am running it on the default stock settings that came with the unit. I don’t have any of the cables are Bluetooth connectivity to look at it in anyway. My question is are these results normal? Do I have to buy more accessories to troubleshoot a product that should work out of the box, or is this supposed to be customized from the start For my specific Jeep.
Other symptoms are that on rural highways the jeep doesn’t want to shift into 8th gear. This only happens at around 50 to 60 mph. Over that speed it ****s to eight deer and cruisesfine.
Any help would be greatly appreciated, thank you.

Terry @ BMS 07-05-2020 04:44 PM

If you're racing around a lot then I'd expect to get lower economy. Beyond that should be no difference. Once you add on a bluetooth or data cable to change maps you can easily enable/disable the JB4 to better evaluate your economy differences.

Ronmaf 07-05-2020 05:10 PM

I will order the Adapter tomorrow. I would like to know why the fuels economy went down so hard. I am averaging about 7mpg less than before installation.
Thanks for the quick reply.

Ronmaf 07-08-2020 05:44 PM

Quote:

Originally Posted by Terry @ BMS (Post )
If you're racing around a lot then I'd expect to get lower economy. Beyond that should be no difference. Once you add on a bluetooth or data cable to change maps you can easily enable/disable the JB4 to better evaluate your economy differences.

Hi Terry, I have the Bluetooth connectivity now and have tried several different tunes. Is there somewhere I can read about how to customize the tune and to get the gauges to work on the app? I would also like to see how the built-in tunes are set. Is there a way to read those tunes to see where the boost is at what rpm etc.

Terry @ BMS 07-08-2020 06:21 PM

If no data in app other than boost let's check the obdii install. Photos of both sides?

Ronmaf 07-09-2020 04:38 AM

2 Attachment(s)
Please see attached

Terry @ BMS 07-13-2020 08:34 PM

1 Attachment(s)
I can see it's wrong in the photo...

Ronmaf 07-15-2020 06:13 PM

Quote:

Originally Posted by Terry @ BMS (Post )
I can see it's wrong in the photo...

Thanks Terry,
I fixed that. Seems my MPG is based on the canned time boost. I did a custom tune with no boost till 2000 rpm. Mpg went up. I also noticed that the transmission will not up shift to 8th gear at cruising speed unless above 62mph. This drastically reduces MPG. The Jeep JL Etorque operates up to 1500rpm. How does the tuner effect shifting or does it? My work around has been manually shifting to 8th gear, but I shouldn’t have to.
Any ideas?

Ronmaf 07-18-2020 10:08 AM

Quote:

Originally Posted by Ronmaf (Post )
Thanks Terry,
I fixed that. Seems my MPG is based on the canned time boost. I did a custom tune with no boost till 2000 rpm. Mpg went up. I also noticed that the transmission will not up shift to 8th gear at cruising speed unless above 62mph. This drastically reduces MPG. The Jeep JL Etorque operates up to 1500rpm. How does the tuner effect shifting or does it? My work around has been manually shifting to 8th gear, but I shouldn’t have to.
Any ideas?

Can anyone offer some advice? My MPg should not be this with this tuner.


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