GroceryGTIer
Drag Racing Champion
- Location
- Tri-state
There are ways of being cheap and making good power with this car. I would just buy a used jb4 and get a good map 6 and enjoy.
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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?
http://www.n54tech.com/forums/showthread.php?t=21269Can 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.
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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+
I've edited my previous post and added the log with even more boost and less timing pull.
Is it normal to be getting such a inconsistency between logs?
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.