JB4 Logging, stacking and Map 6 Discussion

[NeedSleep]

Got it. Thanks! Gonna have to run another log when the weather gets hotter.

Fwiw, when I logged map 2 when it was 50*F a few weeks ago in OC with 2.75 gal of E85 and the rest 91 octane, boost peaked at 23 iirc.

When it regularly hits 90+ degrees again, it'll be interesting, but hopefully I've got an intercooler by then.

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[mursepaolo]

Fwiw, when I logged map 2 when it was 50*F a few weeks ago in OC with 2.75 gal of E85 and the rest 91 octane, boost peaked at 23 iirc.

When it regularly hits 90+ degrees again, it'll be interesting, but hopefully I've got an intercooler by then.

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Yeah I'm hoping for an intercooler by then as well. Don't want to have to go back down to my 91 oct map lol

 

[Diggs24]

I like seeing acceleration videos... logs are great for health and settings, but videos show the real results.

Thanks for sharing, Diggs [emoji16]

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Thanks. Not the best video, TC killing me. Forgot to turn it off.

Anywho. Who likes farts? I do.



A little tunnel action and TC not killing my vibes.



Those without downpipes....it is time....join us.

 

[arob157]

Sent my 7.2psi max profile over to George for review. Said I probably had more room above 5000-7000RPM.

Updated my profile. Minor corrections on the first two logs (1.2 max). Only had driven it for 15 or so minutes.

https://datazap.me/u/arob157/ht-82psi-max?log=1&data=1-2-3-4-11-14-18-25-26-27-28

Third log actually looked decent, but not hitting target. Looks like I will back it down a bit and settle there. The 8.2psi max profile ramped too quickly to hit targets is my theory (afr & ign looked good; maybe it is still adapting). Remapped down low a little bit to smooth out the ramp and then taper a bit more.

https://datazap.me/u/arob157/ht-82psi-max?log=2&data=1-2-3-4-11-14-18-25-26-27-28

 

[Diggs24]

Sent my 7.2psi max profile over to George for review. Said I probably had more room above 5000-7000RPM.

Updated my profile. Minor corrections on the first two logs (1.2 max). Only had driven it for 15 or so minutes.

https://datazap.me/u/arob157/ht-82psi-max?log=1&data=1-2-3-4-11-14-18-25-26-27-28

Third log actually looked decent, but not hitting target. Looks like I will back it down a bit and settle there. The 8.2psi max profile ramped too quickly to hit targets is my theory (afr & ign looked good; maybe it is still adapting). Remapped down low a little bit to smooth out the ramp and then taper a bit more.

https://datazap.me/u/arob157/ht-82psi-max?log=2&data=1-2-3-4-11-14-18-25-26-27-28

It's not the 8.2 target that is the issue, it's the additive map and cool weather. If you want +7psi at 5500 on up use absolute.

 

[mursepaolo]

It's not the 8.2 target that is the issue, it's the additive map and cool weather. If you want +7psi at 5500 on up use absolute.

I don't quite understand this part of additive vs absolute. What is the difference with how it's communicating?

For example, would adding the additive numbers from map 1 to the stock boost profile give you "absolute" numbers for map 1? Or does it not work that way at all?

 

[arob157]

It's not the 8.2 target that is the issue, it's the additive map and cool weather. If you want +7psi at 5500 on up use absolute.

Huh. Looks like it is time to start experimenting with that. My previous logs didn't have too much issue in these temps or even slightly cooler. Then again, I didn't push boost that much above 5000rpm.

Will create a matching absolute profile and try that. Weather is turning though (40F temp difference between morning and afternoon).

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[Diggs24]

I don't quite understand this part of additive vs absolute. What is the difference with how it's communicating?

For example, would adding the additive numbers from map 1 to the stock boost profile give you "absolute" numbers for map 1? Or does it not work that way at all?

Additive just looks at ECU psi and at what psi you want to add and adds it. Why it has issues in cold weather up top I don't know. Perhaps George does.

Absolute is you tell it what psi you want regardless of what it is making. The JB4 then does it's best to hit what you want but the downside is (assuming you have taken off the nanny) you can make it run lean because you are asking it to make too much boost. It can only ask the fuel pump to increase pressure so much without the ECU flipping out.

https://datazap.me/u/diggs24/log-1515442489?log=0&data=1-3-4-6-21

At 6k it is making 16.5psi. I want 17 but it won't do it.

Same IATs, absolute. 17.5psi

https://datazap.me/u/diggs24/log-1521083746?log=2&data=1-3-4-6-21

Heck, darn near 19 if I ask it to:

https://datazap.me/u/diggs24/log-1520647033?log=0&data=1-2-3-4-6-21

AFR isn't safe but it will do it. Perhaps some safety logic is built into it for additive?

 

[tknj99]

I recall reading that auto-tune capabilities may be coming to the JB4. Does anyone have any updates or anticipated timeline for this or any other in-process updates. I'm at 5A_3 now.

 

[Diggs24]

I recall reading that auto-tune capabilities may be coming to the JB4. Does anyone have any updates or anticipated timeline for this or any other in-process updates. I'm at 5A_3 now.

Apparently fault reading (obd2 codes) are going to be provided so we get actual PXXXX codes instead of this weird numbering we get now. Autotune is not ready yet but apparently still working on it.

 

[tknj99]

Apparently fault reading (obd2 codes) are going to be provided so we get actual PXXXX codes instead of this weird numbering we get now. Autotune is not ready yet but apparently still working on it.

Thanks! Can't wait for auto-tune, that is definitely next level goodness

 

[2SlowNoMo]

what is the general idea of auto tune? does it maximize performance within some parameters? don't understand.

 

[mursepaolo]

Additive just looks at ECU psi and at what psi you want to add and adds it. Why it has issues in cold weather up top I don't know. Perhaps George does.

Absolute is you tell it what psi you want regardless of what it is making. The JB4 then does it's best to hit what you want but the downside is (assuming you have taken off the nanny) you can make it run lean because you are asking it to make too much boost. It can only ask the fuel pump to increase pressure so much without the ECU flipping out.

https://datazap.me/u/diggs24/log-1515442489?log=0&data=1-3-4-6-21

At 6k it is making 16.5psi. I want 17 but it won't do it.

Same IATs, absolute. 17.5psi

https://datazap.me/u/diggs24/log-1521083746?log=2&data=1-3-4-6-21

Heck, darn near 19 if I ask it to:

https://datazap.me/u/diggs24/log-1520647033?log=0&data=1-2-3-4-6-21

AFR isn't safe but it will do it. Perhaps some safety logic is built into it for additive?

Strangely enough, I pushed more boost on the additive map on 91 oct than I did on the e30 map absolute. Similar ambient temps and IATs. I do like the possible safety logic built into additive though. Will likely continue to run an additive map in the summer unless I get an upgraded IC.

https://datazap.me/u/mursepaolo/3rd-gear-log-372018

https://datazap.me/u/mursepaolo/e30-3rd-gear-3152018

 

[tknj99]

what is the general idea of auto tune? does it maximize performance within some parameters? don't understand.

My thoughts are that autotune would be continuously monitoring all parameters being sent from the ECU and then adjust the boost that the JB4 is sending to maximize performance at all times. So instead of us having to tinker with logs and configurations, it would be a true set it and forget it solution as close to a tune that can be had.

 

[Diggs24]

Strangely enough, I pushed more boost on the additive map on 91 oct than I did on the e30 map absolute. Similar ambient temps and IATs. I do like the possible safety logic built into additive though. Will likely continue to run an additive map in the summer unless I get an upgraded IC.

https://datazap.me/u/mursepaolo/3rd-gear-log-372018

https://datazap.me/u/mursepaolo/e30-3rd-gear-3152018

It did exactly what you asked it to do. It hit 23 psi on map1 because you asked for 4 on top of ECU and ECU was 19. On your absolute map at the same rpm you only asked it to make 21psi, so that's what it did.

https://datazap.me/u/mursepaolo/3rd-gear-log-372018?log=0&data=1-21

https://datazap.me/u/mursepaolo/e30-3rd-gear-3152018?log=0&data=1-21

Your absolute map would crush map1 run in a race. And the timing advance...well that's not even funny.

https://datazap.me/u/mursepaolo/3rd-gear-log-372018?log=0&data=1-11

https://datazap.me/u/mursepaolo/e30-3rd-gear-3152018?log=0&data=1-11