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JB4 Logging, stacking and Map 6 Discussion

GroceryGTIer

Drag Racing Champion
Location
Tri-state

HA!
 

mat3jko

New member
Location
Slovenia
Did anyone managed to pinpoint yet, why some cars are overboosting on upshifts? Lurking through the logs in this thread, I't seems for me that non-USA models are commonly more affected with this?
 

GTI210

Ready to race!
Location
TX
Can someone point me to where I can read up on how the JB4 works and what goes into creating a map 6? What am I looking for when logging? Think the involvement/self-tuning with the JB4 is pretty cool and would like to truly understand it instead of just copying someone else's map.
 

arob157

Drag Racing Champion
Location
USA
Can someone point me to where I can read up on how the JB4 works and what goes into creating a map 6? What am I looking for when logging? Think the involvement/self-tuning with the JB4 is pretty cool and would like to truly understand it instead of just copying someone else's map.
http://www.n54tech.com/forums/showthread.php?t=21269

To expand on Diggs, read this whole thread plus the one I listed.

Sent from my XT1650 using Tapatalk
 

mat3jko

New member
Location
Slovenia
I've been playing with map6 and doing some more logs today, and I've noticed quite an incosistency in timing pull on 1st cylinder.

What I mean with this, is that on every fith or sixth run that I log, one will have more severe timing pull on 1st cylinder, whilst other will be perfect (or with just a little pull in lower rpms from time to time, which I've also managed to log with stock on map4). Those are runs with just few minutes between them, same road, same fuel, same settings, no pattern or whatsoever...

In short... around 20 logs done today, 2 or 3 (if counting second one posted bellow) with more pull, and other perfect (or almost).

Here's one that has more timing pull.

https://datazap.me/u/mat3jkomk7/log-1522001337?log=0&data=1-4-25

And one with little bit less pull, on even more agressive settings then previous.

https://datazap.me/u/mat3jkomk7/log-1522003475?log=0&data=1-3-4-25

Earlier today I've also logged one with similar pull (if not worse) on map2 (and after that at least 5-6 perfect ones), so I don't think that added boost on map6 is the issue?

Does anyone have some ideas? Could anything other contribute to that, maybe coils or plugs?

Car is stock (aparat from BMC drop-in and removed snow guard) with 100RON fuel.
 
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jybyrd

Go Kart Champion
Location
Seattle, WA
I've been playing with map6 and doing some more logs today, and I've noticed quite an incosistency in timing pull on 1st cylinder.

What I mean with this, is that on every fith or sixth run that I log, one will have more severe timing pull on 1st cylinder, whilst other will be perfect (or with just a little pull in lower rpms from time to time, which I've also managed to log with stock on map4). Those are runs with just few minutes between them, same road, same fuel, same settings, no pattern or whatsoever...

Here's one that has more timing pull.

https://datazap.me/u/mat3jkomk7/log-1522001337?log=0&data=1-4-25

Earlier today I've also logged one with similar pull (if not worse) on map2 (and after that at least 5-6 perfect ones), so I don't think that added boost on map6 is the issue?

Does anyone have some ideas? Could anything other contribute to that, maybe coils or plugs?

Car is stock (aparat from BMC drop-in and removed snow guard) with 100RON fuel.

Taper .5psi from 5500+
 

jybyrd

Go Kart Champion
Location
Seattle, WA
I've edited my previous post and added the log with even more boost and less timing pull. :confused:

Is it normal to be getting such a inconsistency between logs?

You should be very consistent with IGN1 values across logs. The variation in timing pull is fine, as long as IGN1 isn't taking a hit. It should advance naturally to 8-10 without dips
 

mat3jko

New member
Location
Slovenia
Yes, but in my second log the IGN1 values are better with more agressive boost settings.

I'm just confused why I don't get IGN1 dip and IGN2 pull on every log (or at least more often), but maybe on one of five or six at max... under same settings, conditions etc. It's hard to pinpoint the problem and make adjustments like that. :(
 

Tex Willer

New member
Location
Montreal
Map1 log

https://datazap.me/u/qmaze/log-1522012977?log=0&data=1-4&trim=0&tmin=17.81&tmax=138.89

Default map6 log

https://datazap.me/u/qmaze/log-1522016542?log=0&data=0-1-4-9&trim=0&tmin=6.87&tmax=109.65


This would be my starting point for playing with map6 if there are no particular issues. Mods are all intake side (dp on order).034 Intake,cts turbo outlet pipe, muffler delete, turbo inlet.... exhaust side is stock except resonator delete.

Afr spike a 2500rpm an issue?

Car feels awesome, map 6 feels better. This is on 94octane

Some help what to look for. Anything in particular standing out?
 

H22hatch

Ready to race!
Location
Vienna VA
I have not seen 13+ ign1 timing advance. around 9-10 is normal and that's all you need.
It could be your fuel and try to change to different gas/gas station or try higher octane fuel to see if it helps. Also, it the log was done on an uphill, which will induce more load, hence pull timing (experts please correct me if i'm wrong).
So, try different/better fuel and log on a relatively flat road.

I routinely have 15+

 
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