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BMS JB4 R specific thread

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blahblah

New member
Location
Mexico City
George Smooth said:
It is fine. we developed the unit at 5600ft. If you going to use map 6 we just need to keep a eye at peak boost from 6000 and up.
At your altitude torque will be similar to coast and maybe around 10whp down at high rpm vs the coast.
On the R the JB4 cannot provide sufficient fueling for a big turbo.
Click to expand...

Okay.. I ordered a JB4.

Is a downpipe a good way to reduce the turbo lag at high elevation? Will a larger intercooler increase lag noticeably at high elevation? Can I run Map 2 with a downpipe at 10,000 ft with 93 fuel? Anyway I will log...
 
S

Schnell_R

Ready to race!
Location
Monroe, NC
blahblah said:
Okay.. I ordered a JB4.

Is a downpipe a good way to reduce the turbo lag at high elevation? Will a larger intercooler increase lag noticeably at high elevation? Can I run Map 2 with a downpipe at 10,000 ft with 93 fuel? Anyway I will log...
Click to expand...

Change one thing at a time. Don't go fixing problems before they are known. I would run the jb4 solidly for a month before making changes. A better flowing downpipe is always welcome in a performance application.
 
D

Daument

Ready to race!
Location
SE PA
I've recently upgraded my JB1 to JB4. I now have part and full throttle surging on map 2, Map 6 surges at part throttle but seems smooth at full throttle.


MAP2 first pull
2017 Golf R 6MT
no mods
60 degree day
3rd gear

1stpullmap2 by daument100, on Flickr[/IMG]

MAP2 second pull
same as above

2ndpullmap2 by daument100, on Flickr

MAP6

IMG_0452 by daument100, on Flickr

MAP6 Settings

map6 settings by daument100, on Flickr


Any ideas?

thanks !!
 
O

OliS3

New member
Location
UK
I was wondering how launch control works for you running a JB4

I run map 6 with 1st gear boost limited to 18.5psi and it was working fine. Now it takes off hard and about 5k rpm I get a massive loss of power and it takes a second until the power kicks in and then the car runs fine.

I assume it is a torque limiter or traction control coming in (I do have ESC fully off)

If I do a few in a row by the 3rd it works fine and continues to work fine (extra tyre temp or the car pulling power from getting warm?)
 
Diggs24

Diggs24

Autocross Champion
Location
de plains! de plains!
Car(s)
2015 GTI
OliS3 said:
I was wondering how launch control works for you running a JB4

I run map 6 with 1st gear boost limited to 18.5psi and it was working fine. Now it takes off hard and about 5k rpm I get a massive loss of power and it takes a second until the power kicks in and then the car runs fine.

I assume it is a torque limiter or traction control coming in (I do have ESC fully off)

If I do a few in a row by the 3rd it works fine and continues to work fine (extra tyre temp or the car pulling power from getting warm?)
Click to expand...

Can you log this?
 
O

OliS3

New member
Location
UK
Diggs24 said:
Can you log this?
Click to expand...

I can't see why not, I think it is down to the extra torque the JB4 adds as others have had issues with the JB1 and dropping down the boost from 5 to 4.8 has solved it.

I was just wondering how many others have these issues
 
D

Daument

Ready to race!
Location
SE PA
lebenfitti said:
Where are we at on the firmware upgrade?

Sent from my SM-T230NU using Tapatalk
Click to expand...



George looked at the logs and sent new firmware. It’s been a few hundred miles since the update was installed. It still has a slight surge around 3500 with part throttle but it’s virtually unnoticeable if your not driving it. I’ll be installing an AWE down pipe in the next few weeks, we’ll see how that works out.


Sent from my iPad using Tapatalk
 
S

Steenbeek

Passed Driver's Ed
Location
Austria
Do any of you guys recognize DSG slip when boost kicks in in mid range?
I always have it for one or two seconds when i go wot at lets say 4000rpm.
I want to avoid buying a dsg software.
 
D

Dragk913

Go Kart Newbie
Location
DFW, Tx
Hey guys,

I'm running Map2 on my JB4, but keep hitting a safety and the JB4 is reverting back to Map4. I've already emailed George, but figured I'd check in with y'all to see if anyone can spot what's causing the issue. ETA: this Map2 log is a 3rd-4th gear pull starting at roughly 60mph. Should I re-log it from a lower speed?

Datalog: Located Here

Current mods on the Golf R are only 93oct fuel (United States), intake, turbo inlet pipe, cat-back exhaust (stock downpipe).

Any help would be greatly appreciated!
 
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