JB4 Log Review

[Thatpartsguy]

Hello everyone!
I was hoping to get some guidance on what I might need to change to get my maps dialed in. I am running a catted downpipe only on a 6mt. I have access to 93 up to 110 octane and e85. I have FF set to 30 per Coloneladama's guide. This is my first time tuning my own vehicle and I would greatly appreciate any feedback or knowledge you have to give. The fuel I was running at the time of the log is in the log title. Thank you all very much for your help!

https://datazap.me/u/thatpartsguy/map-1-ff30?log=0&data=1-4


https://datazap.me/u/thatpartsguy/942gal-e85-map1-ff30?log=0&data=1-4

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[i3igpete]

Both logs, boost control seems fine, but timing looks marginal on 93. Keep it on map 1 for that fuel (or find a different gas station).

You can turn it up more for 94.

(i see you're on the new firmware with the weird equation for cyl 2-6)

There is a small amount of overshoot at 4000 but that's typical for a catted dp and the throttle plate catches it just fine. If you really want to, you can drop Duty bias by 5 points below 4000 and it'll catch it better. Remember duty bias uses the same table for all maps, so you should be able to set it and forget it

 

[ColonelAdama]

Hello everyone!
I was hoping to get some guidance on what I might need to change to get my maps dialed in. I am running a catted downpipe only on a 6mt. I have access to 93 up to 110 octane and e85. I have FF set to 30 per Coloneladama's guide. This is my first time tuning my own vehicle and I would greatly appreciate any feedback or knowledge you have to give. The fuel I was running at the time of the log is in the log title. Thank you all very much for your help!

https://datazap.me/u/thatpartsguy/map-1-ff30?log=0&data=1-4


https://datazap.me/u/thatpartsguy/942gal-e85-map1-ff30?log=0&data=1-4

Ah yeah I see it is an MT. It looks good to me with the E85. Agree with Pete on the 93 only isn't great timing. You're probably fine to leave boost control as is if it feels smooth.

 

[Thatpartsguy]

Both logs, boost control seems fine, but timing looks marginal on 93. Keep it on map 1 for that fuel (or find a different gas station).

You can turn it up more for 94.

(i see you're on the new firmware with the weird equation for cyl 2-6)

There is a small amount of overshoot at 4000 but that's typical for a catted dp and the throttle plate catches it just fine. If you really want to, you can drop Duty bias by 5 points below 4000 and it'll catch it better. Remember duty bias uses the same table for all maps, so you should be able to set it and forget it

Thank you! When you guys are looking at timing is it just ign1 since 2-6 are weird or do you watch all of them? Second do you think I could do a custom map 6 and run more boost on 94 or should I just stick with map2? I appreciate the help I am a complete noob but want to understand all that I can. Also should I rollback firmware?

 

[i3igpete]

Leave the firmware as-is, it works better for MT

Old firmware version, ign for all cylinders 1-6 is reported as the raw number. Just need to make sure they stay together and rise together.

For new firmware versions, cylinder 1 is the raw number, 2-6 are reported as deviations from cylinder 1. However, it's a dumbass method because 2-6 also artificially clip at zero.

 

[i3igpete]

No wonder. I was looking at his log and all weird out a lil lol!

Looks like there's a way to revert it back to the old way

Note with firmware v20+ values 2-6 reflect timing drops rather than raw timing advance per cylinder. Set FUA = 1 to revert back to raw timing if needed. In the new format this shows how many degrees were removed from that specific cylinder.

 

[razorlab]

For new firmware versions, cylinder 1 is the raw number, 2-6 are reported as deviations from cylinder 1. However, it's a dumbass method because 2-6 also artificially clip at zero.

Wait, so you have no idea how Cyl 2-6 are doing then, or am I reading this wrong?

 

[Thatpartsguy]

Wait, so you have no idea how Cyl 2-6 are doing then, or am I reading this wrong?

Curious as well, what should I be watching to look for knock?

 

[i3igpete]

Wait, so you have no idea how Cyl 2-6 are doing then, or am I reading this wrong?

If 2-6 are worse than 1, you can work out the math. If 2-6 are better than 1,

 

[razorlab]

If 2-6 are worse than 1, you can work out the math. If 2-6 are better than 1,

But you said they are deviations of cyl 1. Or are you saying 2-6 is showing deviation from cylinder 2-6 setpoint?

If so, that is just per cyl retard, which is a good thing to log.

 

[i3igpete]

Checked the docs again, Ign2-6 is per-cylinder retard from the setpoint/lookup/whatever, not the delta of curves (cyl 1)-(cyl n).

Either way, some information is lost. We don't know what the ideal setpoint is, so you don't know if a given cylinder is doing better/worse than cylinder 1.

 

[razorlab]

Checked the docs again, Ign2-6 is per-cylinder retard from the setpoint/lookup/whatever, not the delta of curves (cyl 1)-(cyl n).

Either way, some information is lost. We don't know what the ideal setpoint is, so you don't know if a given cylinder is doing better/worse than cylinder 1.

You can easily see ignition timing setpoint from BIN files.

 

[ColonelAdama]

Checked the docs again, Ign2-6 is per-cylinder retard from the setpoint/lookup/whatever, not the delta of curves (cyl 1)-(cyl n).

Either way, some information is lost. We don't know what the ideal setpoint is, so you don't know if a given cylinder is doing better/worse than cylinder 1.

IMO the new version has its benefits. lots of people always ask "well my timing is lower than this guys" Yes, but that is lower base timing, doesn't mean its a correction. The new firmware just shows corrections for 2-6 and ign1 stays as its always been (ie. actual ign advance)

Its because BMS plans on doing an auto-tune map like they have for N55 which will scale boost targets up or down automatically depending on the average of the corrections during pulls. Its *almost* a flex map, but adjusts boost rather than timing.

 

[razorlab]

IMO the new version has its benefits. lots of people always ask "well my timing is lower than this guys" Yes, but that is lower base timing, doesn't mean its a correction. The new firmware just shows corrections for 2-6 and ign1 stays as its always been (ie. actual ign advance)

Yea that makes way more sense and basically what DME tuning loggers do. Well, they show cyl 1-6 timing advance AND cyl 1-6 timing correction. In all honesty, I personally only log cyl 1-6 timing advance and overall timing correction. Also, since I have real load logging I can just cross reference ignition setpoint and correction factor tables.

 

[GRMan]

IMO the new version has its benefits. lots of people always ask "well my timing is lower than this guys" Yes, but that is lower base timing, doesn't mean its a correction. The new firmware just shows corrections for 2-6 and ign1 stays as its always been (ie. actual ign advance)

Its because BMS plans on doing an auto-tune map like they have for N55 which will scale boost targets up or down automatically depending on the average of the corrections during pulls. Its *almost* a flex map, but adjusts boost rather than timing.

Very interested in this autotune map, this can bridge the current gap between map 1 and map 2

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