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Terry @ BMS's Avatar
Terry @ BMS Terry @ BMS is offline
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Default 05-20-2020, 06:01 PM

Yes you'll generally make less boost with less barometric pressure, but the ECU will compensate for some of the pumping losses by raising it's boost target slightly.


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Beezupra Beezupra is offline
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Car: Porsche 991.2 Turbo S
Default 05-24-2020, 02:11 PM

Hi Terry

I updated my firmware on my '18 991.2 TTS JB4 as you suggested last week. Now my gauges aren't working correctly. I read the troubleshooting page and other threads, but none of those suggestions helped. Details are:

All gauges and the app worked fine for the past month, up until the moment I updated the firmware, so it doesn't fit to think it is a mechanical connection issue with the OBD2 cable (although I did go ahead and disconnect/reconnect both ends of that cable a couple times anyway).

The only gauge that works correctly is the one showing which map I am on. The other gauges all show no reading, until I apply hard throttle and get boost up. Then the gauges will all flash to life and then immediately "freeze" on a fixed display number. The frozen display will stay the same until the next time I greatly exceed the earlier boost level, then it will again momentarily display and then re-freeze with a higher boost reading.

100% of the time I go to the Read Code option, it says "invalid read, try again?" Then when I return to the gauge display from the read code option, the map gauge goes to no reading/zero, even though it says I am still connected. If I then disconnect/reconnect the BT, the gauges go back to only map gauge reading correct and all others zero.

I have tried force closing the app, and rebooting the iphone, and leaving the car locked overnight with no benefit.

Initially I thought maybe the firmware hadn't succeeded, because after waiitng for the writing blocks, I would return to my iPhone to just see the same screen I started with, with no evidence that anything was finished. This led to re-uploading the firmware several times, but the last two times I observed that if I was watching the screen carefully at the end of the writing blocks step, messages momentarily appeared that said ...verifying checksum.... rebooting JB4.....update complete!...... The last crucial message of "update complete" was visible on the screen for no more than a half-second before it would disappear. Hopefully that is all I am supposed to see after a successful update.

Attached is a brief log I ran while getting on throttle to make the gauges go from zero to the momentary on then frozen values.

Look forward to your advice about getting the gauges working again, thanks.
Attached Files
File Type: csv 20200522_111807_runs(1).csv (6.2 KB, 3 views)
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Terry @ BMS's Avatar
Terry @ BMS Terry @ BMS is offline
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Default 05-24-2020, 05:28 PM

Interesting as nothing on the OBDII side changed with the firmware.

If JB4 had no firmware you would not be able to connect at all.

There is a command in there, options bit4, for slower speed CANbus. As a test turn that option on and lets see if it makes any difference.

As another test when data stops press the "purge" button on the WMI page and see if that gets data moving. We have a CANbus reset command in there.


Burger Motorsports
Home of the JB4 the worlds most popular turbocharged tuning system!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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Beezupra Beezupra is offline
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Car: Porsche 991.2 Turbo S
Default Today, 06:29 AM

Bit4 turned on, Purge button tapped, and I tried uninstalling and reinstalling the app. None helped. Now it is not briefly flashing up the frozen values, it is just staying at all gauges zero, except map displays.

Next suggestion?
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