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JB4 Logging, stacking and Map 6 Discussion

goodvibes

Go Kart Champion
Location
IL
FOL 50 really isn't needed but shouldn't hurt anything either.
 

RN_MK7.5R

New member
Location
Bloemfontein
Car(s)
2017 MK7.5R DSG
Hi guys,

So I am looking for some guidance,

I noticed when stacking that the boost value stays the same,

for instance I have Racingline stage 2 98 file,

on just the file it requests ecu psi at 24.4psi at 5500 rpm and it shows boost also at 24.4psi

when adding boost at that rpm lets say 2psi stack on 5500 it looks like the ecu psi is lowering and the boost is staying the same at 24.4psi.

so my question, is it actually adding boost and just now showing it? Or is the file blocking the stack by lowering ecu psi and keeping boost at 24.4psi?

https://datazap.me/u/rnmk75r/ecu-psi-question?log=0&data=1-4
 

ZuMBLe

Autocross Champion
Location
NY
Car(s)
Alltrack 6MT
Hi guys,

So I am looking for some guidance,

I noticed when stacking that the boost value stays the same,

for instance I have Racingline stage 2 98 file,

on just the file it requests ecu psi at 24.4psi at 5500 rpm and it shows boost also at 24.4psi

when adding boost at that rpm lets say 2psi stack on 5500 it looks like the ecu psi is lowering and the boost is staying the same at 24.4psi.

so my question, is it actually adding boost and just now showing it? Or is the file blocking the stack by lowering ecu psi and keeping boost at 24.4psi?

https://datazap.me/u/rnmk75r/ecu-psi-question?log=0&data=1-4
Strange that your DME_BT is lower than your Boost value even without the JB4 adding boost. That's probably caused by something the flash is doing. I've actually never seen this behavior.

Your JB4 is not adding boost, you're on Map 0. Boost target is 0.
https://datazap.me/u/rnmk75r/ecu-psi-question?log=0&data=1-3-4-15-23

EDIT: Just saw your second log in there with a map 6. I think the problem is additive works off adding on top of the DME_BT and yours is a constant 20.1 psi. Try using absolute Map 6 values instead of addititve.
 
Last edited:

RN_MK7.5R

New member
Location
Bloemfontein
Car(s)
2017 MK7.5R DSG
Strange that your DME_BT is lower than your Boost value even without the JB4 adding boost. That's probably caused by something the flash is doing. I've actually never seen this behavior.

Your JB4 is not adding boost, you're on Map 0. Boost target is 0.
https://datazap.me/u/rnmk75r/ecu-psi-question?log=0&data=1-3-4-15-23

EDIT: Just saw your second log in there with a map 6. I think the problem is additive works off adding on top of the DME_BT and yours is a constant 20.1 psi. Try using absolute Map 6 values instead of addititve.
Could you please explain what it means to use absolute map 6 values? Instead of additive values? How does one do that?
 

ZuMBLe

Autocross Champion
Location
NY
Car(s)
Alltrack 6MT
Do you mean instead of adding 4psi at 5500 I give it a number of 27psi
To make the JB4 use absolute instead of additive, use a number more than 10 in the 1500 RPM slot. You then enter the desired final value in to each RPM slot. 15,18,20,25, 26, etc etc.
 

RN_MK7.5R

New member
Location
Bloemfontein
Car(s)
2017 MK7.5R DSG
To make the JB4 use absolute instead of additive, use a number more than 10 in the 1500 RPM slot. You then enter the desired final value in to each RPM slot. 15,18,20,25, 26, etc etc.
Will this then override the software? Or just add boost onto the file still? Does this not make the file absolute?
 

ZuMBLe

Autocross Champion
Location
NY
Car(s)
Alltrack 6MT
Will this then override the software? Or just add boost onto the file still? Does this not make the file absolute?

I don't understand the question.

Additive Boost means the system will add the value on top of the DME_BT value. There seems to be a problem with this in your case because your DME_BT is lower than your actual boost.

Absolute Boost means the JB4 will try to keep raising boost until it reaches the number in the cell you specified.
 

RN_MK7.5R

New member
Location
Bloemfontein
Car(s)
2017 MK7.5R DSG
What
To make the JB4 use absolute instead of additive, use a number more than 10 in the 1500 RPM slot. You then enter the desired final value in to each RPM slot. 15,18,20,25, 26, etc etc.
would be a good boost graph for a starting point?

I have never done absolutes, only additive
 

Chogokin

Autocross Champion
Location
So Cal
Car(s)
GTI Sport | Audi A3
So I've been going through some of he old posts in this thread and came across this Map 6 from user Perry01 from around 2017. Holy smokes...the car pulls hard above 4k. He also has a more agressive map with more above 5k. I didn't get a chance to go pedal to the floor...but even at 3/4 throttle...the car pulls harder than Map 3.

Will my motor asplode?

jb4 map 6.jpeg
 

shovelhd

Autocross Newbie
Location
Western MA
Got some logging done with Map 4. Trying to take advantage of this cold weather and build map 6.

Can someone give some settings for map 6 to try?

Logs https://datazap.me/u/jackphom/jb4-m...-pull?log=0&data=1-8-11-12&solo=11&mark=57-81

https://datazap.me/u/jackphom/map-4-second-log?log=0&data=1-4&solo=4&mark=212

Don't use someone else's settings. There are too many variables. I also wouldn't use Map 4 as your baseline unless you're running E85. Start with Map 1. Your logs have a lot of junk in them, too. Start the log at 3rd gear 2500rpm and run it up to your 4th gear shift then stop the log.

That said, there's some data in the middle of your second log that's pertinent. You're getting a little timing pull but nothing alarming. Map 4 is +6psi with a taper. Set up your initial Map 6 to look just like your Map 4 log. Run the logs again. That's your starting point. I'd also point out that it's cold in NYC now and your Map 6 created during boost season is probably going to be too hot for the summer. If you want to run your car on the edge, you need to keep checking logs as the temperature and fuel changes during the year.
 
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