BMS JB4 R specific thread

[George Smooth]

i know probably a stupid question but, how big a hole does it leave in the wire you have to tap if you remove it all before a dealer trip? Thanks

It is a small pin that goes through the wire.

 

[Daument]

Pull the insulating cover back a few inches and install the tap. If you need to remove it the insulating cover will hide the small pinprick in the afr wire


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[Daument]

Set it to map 4 then unplug and flash the car. Then when you plug the OBD again you don't need to remember to put it in map 4. Map 0 can also be used. With the current JB4 firmware its vital the OBD is plugged in because without that signal it will add 4psi going to its safety map. We doing a new version soon where when the OBD is unplugged it will add more boost. There are more and more people stacking so its safer this way in the long run I guess.

FWIW.... here’s what a Unitronic stage 2 93oct log looks like on a bone stock (JB4 on map4) ‘17 golf R. I decided to do a single pull in third before the downpipe goes on for a baseline. Looks like many throttle adjustments going on. The weather was sunny and clear with air temp at 40f.

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[Diggs24]

FWIW.... here’s what a Unitronic stage 2 93oct log looks like on a bone stock (JB4 on map4) ‘17 golf R. I decided to do a single pull in third before the downpipe goes on for a baseline. Looks like many throttle adjustments going on. The weather was sunny and clear with air temp at 40f.

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Throttle adjustments are normal on the R. Log looks great.

 

[George Smooth]

Throttle adjustments are normal on the R. Log looks great.

Not for the flashed cars. Only Uni shows this. For some reason they run the car against the torque limiter which makes it slightly harder to stack. On the DSG cars the flash takes some of this away.

 

[cpt_charlios]

If I buy a new JB4 unit, will it already come with the latest firmware?

 

[Diggs24]

If I buy a new JB4 unit, will it already come with the latest firmware?

Possibly, but you want to buy the datacable anyways so it doesn't really matter.

 

[George Smooth]

If I buy a new JB4 unit, will it already come with the latest firmware?

All the units sold now have the latest on.

 

[cpt_charlios]

Just placed an order for the JB4 with the Bluetooth!

 

[vucanthi]

Hey guys,

I have a JB4 for sell for $330. I can ship anywhere in the US. IM me on facebook at https://www.facebook.com/vucanthi

 

[Diggs24]

Not for the flashed cars. Only Uni shows this. For some reason they run the car against the torque limiter which makes it slightly harder to stack. On the DSG cars the flash takes some of this away.

Thanks George.

 

[Dragk913]

Good morning, gents!

Would anyone be willing to look over this 3rd-4th gear log?

I'm trying to work out a new tune (shooting for 26psi!), but I'm worried about my AFR. The average AFR for this log is 14.32, but it spikes as high as 23.3 for one cell in the CSV (and stays around 21.5 for three cells in CSV). I hope I'm just worried for nothing, but I figured I'd check with the gang here

Datazap Link!


Thanks!
Austin

 

[rr1santos]

Good morning, gents!

Would anyone be willing to look over this 3rd-4th gear log?

I'm trying to work out a new tune (shooting for 26psi!), but I'm worried about my AFR. The average AFR for this log is 14.32, but it spikes as high as 23.3 for one cell in the CSV (and stays around 21.5 for three cells in CSV). I hope I'm just worried for nothing, but I figured I'd check with the gang here

Datazap Link!


Thanks!
Austin

21.5 is super lean if that is your cruising afr read..are you sure you're reading it properly? I am GIAC tuned and stacked with the jb4 and I get 13-14.8 normal cruising..on WOT I get down to 11.5-12. only time I see a 20 for in instant is when I left off the gas or at a shift. other than that I never see anything above 15 at cruising..in any gear

edit: I just looked at your log and it looks weird..why are you getting the afr spike and drop in the middle of your pull? I would check your positap to make sure it is secured properly..what map setting are you at?

 

[Steenbeek]

Good morning, gents!

Would anyone be willing to look over this 3rd-4th gear log?

I'm trying to work out a new tune (shooting for 26psi!), but I'm worried about my AFR. The average AFR for this log is 14.32, but it spikes as high as 23.3 for one cell in the CSV (and stays around 21.5 for three cells in CSV). I hope I'm just worried for nothing, but I figured I'd check with the gang here

Datazap Link!


Thanks!
Austin

Hi

you have exactly the same issue as I do. The trims stays flat sometimes at 40 sometimes below and afr rises during acceleration. It scares me to death all the time. How hot is your car, oil, cat? The engine goes lean to stay inside an efficient temperature window for the catalytic converter. If it is too cold or in the heating process it does that I recognized.
George told me not to be too scared about that, because the engine has a safety feature if egt is too hot. It dumps fuel if egt reaches 1050°C. This is independent from trims and also workes if fueling has reached a ceiling.
Your fueling doesn't seem to be maxed out so stay calm I think.

 

[Diggs24]

21.5 is super lean if that is your cruising afr read..are you sure you're reading it properly? I am GIAC tuned and stacked with the jb4 and I get 13-14.8 normal cruising..on WOT I get down to 11.5-12. only time I see a 20 for in instant is when I left off the gas or at a shift. other than that I never see anything above 15 at cruising..in any gear

edit: I just looked at your log and it looks weird..why are you getting the afr spike and drop in the middle of your pull? I would check your positap to make sure it is secured properly..what map setting are you at?

It looks weird because it's set wayyyy to high for winter. Need some E85 to run this kind of boost as well.

Timing looks like absolute shit. Turn it down. Also, confirm Fuel/AFR Bias all set to 100.

https://datazap.me/u/dragk913/06jan-26psi-tune?log=0&data=1-11