BMS VW GTI JB4 info thread

[ChrisMk77]

Did some logs this morning, thought I turned off the "Combine Logs", apparently not. It's just map 1, but does it look pretty normal? Thought I'd email George and maybe get a clutch saver map 6, I'm not really an aggressive driver (most of the time) and only drive 5 or 6k a year so may not even bother.
Also can the log be broken up into individual logs?
Thanks

https://datazap.me/u/scott59/log-1618766214?log=0&data=1-4-5-14-19-26-27-36

Looks ok and yes you can zoom in and link like this: datazap.me | Scott59 | Log 1618766214

 

[scott59]

Thanks Chris.

 

[Buck43]

Hey guys, looking for some guidance. Purchased used and installed jb4.. little nervous about running map 1 being around 6k altitude and only having access to 91 octane. Not too mention it gets HOT in the summer. Big question is, if I just stay on map 1 with no other adjustments will I be fine? I’d ask George to help however gave up that right with buying used. Any input is appreciated.

 

[DrFunkalupicus]

Hey guys, looking for some guidance. Purchased used and installed jb4.. little nervous about running map 1 being around 6k altitude and only having access to 91 octane. Not too mention it gets HOT in the summer. Big question is, if I just stay on map 1 with no other adjustments will I be fine? I’d ask George to help however gave up that right with buying used. Any input is appreciated.

I think you will be fine. 91 and map 1 go together great.

 

[up4speed]

Hey guys, looking for some guidance. Purchased used and installed jb4.. little nervous about running map 1 being around 6k altitude and only having access to 91 octane. Not too mention it gets HOT in the summer. Big question is, if I just stay on map 1 with no other adjustments will I be fine? I’d ask George to help however gave up that right with buying used. Any input is appreciated.

If you want to be sure, make some data logs and post them. If there is an issue, I'm pretty sure it will all show up on the logs. Just make sure that you are not running lean, or that there isn't too much timing pull.

 

[Terriquez88]

Hey guys, this may be a question that has been answered before but I couldnt find an exact answer. Can I run a Downpipe on map 2? And if so should I think about an e30 mix or should I just run 91 gas. I’m in California sadly.

 

[IanCH]

Hey guys, this may be a question that has been answered before but I couldnt find an exact answer. Can I run a Downpipe on map 2? And if so should I think about an e30 mix or should I just run 91 gas. I’m in California sadly.

If you have to ask this question you need to read more before running this setup

 

[904mk7]

Hey guys, this may be a question that has been answered before but I couldnt find an exact answer. Can I run a Downpipe on map 2? And if so should I think about an e30 mix or should I just run 91 gas. I’m in California sadly.

Yes, on all fronts, but you have to log.

 

[shortyb]

If you have access to E85, send it. Roughly 3 gallons on a complete fill-up with the balance of 91 gives you a pretty good ballpark E30 mix. Your car will likey.

 

[Panpolanski]

Just ordered a JB4 with BT module. What should I keep my eyes on when monitoring? (I used to have a Cobb AP on my 2015 WRX and always kept eyes on boost, DAM, knock learn, AFR, etc; is there a similar list of important stuff to look at on the JB4 on my 2019 GLI?). Thanks guys (and gals!).

 

[shovelhd]

The BT allows you to put up a fixed number of gauges from a long list. What you choose depends on what you want to keep an eye on. Timing, boost, IAT are three I couldn't do without.

 

[haste]

Great thread here guys. I just picked up a 2021 SE trim GTI and am looking for some tuning options. My wife really misses her stage 3 Fiesta ST and the GTI doesn't have the push you back in the seat torque the Fiesta had.

The JB4 is really intriguing because of the installation/removal of it and no trace in the ECU of tuning. I'm looking for a basic tune, probably Map 2.

I'm seeing a lot of info that the JB4 really only kicks in when WOT. My wife rarely drives WOT. Will this tuning device make a difference in power when driving partial throttle?

 

[Panpolanski]

The BT allows you to put up a fixed number of gauges from a long list. What you choose depends on what you want to keep an eye on. Timing, boost, IAT are three I couldn't do without.

Thank you for the response, doing further research on this topic also points me to monitoring those parameters. Thoughts on whether running Map 1 on a MK7 GLI with bolt-ons (a K&N intake and MBRP catback exhaust) is ok to do?

 

[Diggs24]

Great thread here guys. I just picked up a 2021 SE trim GTI and am looking for some tuning options. My wife really misses her stage 3 Fiesta ST and the GTI doesn't have the push you back in the seat torque the Fiesta had.

The JB4 is really intriguing because of the installation/removal of it and no trace in the ECU of tuning. I'm looking for a basic tune, probably Map 2.

I'm seeing a lot of info that the JB4 really only kicks in when WOT. My wife rarely drives WOT. Will this tuning device make a difference in power when driving partial throttle?

no

 

[Diggs24]

Thank you for the response, doing further research on this topic also points me to monitoring those parameters. Thoughts on whether running Map 1 on a MK7 GLI with bolt-ons (a K&N intake and MBRP catback exhaust) is ok to do?

yes. run BP 93 as well.