Log from Dyno - Cyl 1 timing

keninger

Specialist
Sep 11, 2018
50
10
0
Ride
335i E92 N54
My cylinder 1 timing is mostly different from all the other cyl timings. All of them are mostly working the same but cyl one behaves differently. as you can see in the log it even spikes up like crazy after I let off the throttle. But what really bothers me that it is very different from all the others.

N54
I have new plugs (was the same with old plugs)
I have also swapped cyl 1 and cyl 2 coils, remained the same.
I have new index 12 injectors

What could be the cause of this?


https://datazap.me/u/keninger/dyno?log=0&data=1-4-11-25-26-27-28-29
 

R.G.

Lieutenant
Nov 17, 2016
669
325
0
Henderson, NV
Ride
E92 335, F10 M5
Says map 6, is that the user adjustment map? If so, that'd prob be a good place to look first. Wish I could help more but never could get my car right with JB4. Too many fuds and hexs and other silly sounding acronyms.
 

keninger

Specialist
Sep 11, 2018
50
10
0
Ride
335i E92 N54
Turns out that ign 1 timing sampling is different from all the others, that’s why it is different.

It isn’t noted in the jb4’s log documentation.

This is the answer I got in one of the groups.

“With a jb4, cylinder 1 is sampled at a quicker rate than 2-6 so sometimes it looks a bit different and spikes often won’t show up on the other cylinders. You’re good.”
 

R.G.

Lieutenant
Nov 17, 2016
669
325
0
Henderson, NV
Ride
E92 335, F10 M5
Turns out that ign 1 timing sampling is different from all the others, that’s why it is different.

It isn’t noted in the jb4’s log documentation.

This is the answer I got in one of the groups.

“With a jb4, cylinder 1 is sampled at a quicker rate than 2-6 so sometimes it looks a bit different and spikes often won’t show up on the other cylinders. You’re good.”


Right, of course, totally knew that...
Reminds me of when JB4 only logged a single cylinder

Thanks for updating w solution. GL
 

keninger

Specialist
Sep 11, 2018
50
10
0
Ride
335i E92 N54
Right, of course, totally knew that...
Reminds me of when JB4 only logged a single cylinder

Thanks for updating w solution. GL

You really need to understand the jb4 to set it up properly and to be honest, the lack of documentation of jb4's certain settings is frustrating.

For example FF gain by rpm is not explained anywhere, so I had to figure out what it does and turns out, that controlling boost, the main function of jb4 would require some fine-tuning from the developers, because with FF gain by rpm there are sudden changes to the FF curve which cause instant overboost spikes and you get a wavy boost curve with over and under target before initially finding the target.
 
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R.G.

Lieutenant
Nov 17, 2016
669
325
0
Henderson, NV
Ride
E92 335, F10 M5
You really need to understand the jb4 to set it up properly and to be honest, the lack of documentation of jb4's certain settings is frustrating.

For example FF gain by rpm is not explained anywhere, so I had to figure out what it does and turns out, that controlling boost, the main function of jb4 would require some fine-tuning from the developers, because with FF gain by rpm there are sudden changes to the FF curve which cause instant overboost spikes and you get a wavy boost curve with over and under target before initially finding the target.





Who doesn't love digging thru 50 threads to find simple updates and input explanations?
 

R.G.

Lieutenant
Nov 17, 2016
669
325
0
Henderson, NV
Ride
E92 335, F10 M5
Oh, of course JB4 logs saying e85 @ e90 means 20%. Can’t they update that shit already so we do t have to do equations to figure out actual values ffs


To clarify the snarky comment
My previous set up (currently hands smell to hell of fuel as I’m right in the middle of updating) was two in bucket Wally 450s, with venturi and running at or above 20psi deviations were from 55-80. Assumed e90 meant e90 and was hard to look at those logs without a bit of skepticism aimed at the JB.
 

keninger

Specialist
Sep 11, 2018
50
10
0
Ride
335i E92 N54
Oh, of course JB4 logs saying e85 @ e90 means 20%. Can’t they update that shit already so we do t have to do equations to figure out actual values ffs


To clarify the snarky comment
My previous set up (currently hands smell to hell of fuel as I’m right in the middle of updating) was two in bucket Wally 450s, with venturi and running at or above 20psi deviations were from 55-80. Assumed e90 meant e90 and was hard to look at those logs without a bit of skepticism aimed at the JB.

It is clear that you are not a fan of jb4 lol
 
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