[Mike@N54Tuning.com]

Nice little update on the JB4 front. It now has gear dependent boost control! Perfect for racing on street tires at the track or just staying in your lane around town. Here is a description of how it works and a short testing log.

Here is how it works:

1) The JB4 monitors the currently selected gear via CAN. Viewable in the attached log as "gear". Interestingly in this auto log it switches over to the next gear ~200rpm before the shift actually takes place. This must be the point the TCU is initiating the shift. Haven't logged this on any manuals yet but will and post soon.
2) When in 1st and 2nd gear a user defined boost reduction is applied ranging from 0-5psi entered as 0-50 in the appropriate field. This is subtracted from whatever your target would otherwise be regardless of map selected. So for example in this log 40 means a maximum of 4psi is removed during first gear.
3) The boost reduction is only in effect at higher throttle positions. Normal driving and response are not negatively impacted until you really get on the throttle.
4) The system prevents the WOT boost target from falling below 8psi regardless of settings.

Mike

[M3 Eater]

Originally Posted by Clap135

What exactly did I do besides state facts? If facts anger you...then you are the prime candidate for BMS. Enjoy your tune.

I am wondering, if this could be integrated later into meth control, example.... I am in 5th gear cruising and step on the pedal to change lanes, my boost jumps over my min target for a moment and WASTES meth as I manuver. I say this because there is no real signifigant improvement in acceleration during a high gear, moderate rpm application of throttle. Could I tell JB4 to only allow meth spray during x boost , y rpm, z gear? I understand the JB4 is progressively getting smarter and should be able to eventually control the cmgs in ways that it hasn't before.

I can easily see how by reducing the ammount of boost in lower gears should help launch in the AT dramatically and even possibly the MT as well for the guys without LSD. Great Work as I know this is something the JB users have been asking for for some time. Its got to be better the using the AT clutch for traction control during WOT launches.

[chiaobaby]

I predict that the 2 major piggy back tuners hardware will be reverse engineered by an asian company and will run of an Iphone app just joking.

[Mike@N54Tuning.com]

Originally Posted by M3 Eater

I am wondering, if this could be integrated later into meth control, example.... I am in 5th gear cruising and step on the pedal to change lanes, my boost jumps over my min target for a moment and WASTES meth as I manuver. I say this because there is no real signifigant improvement in acceleration during a high gear, moderate rpm application of throttle. Could I tell JB4 to only allow meth spray during x boost , y rpm, z gear? I understand the JB4 is progressively getting smarter and should be able to eventually control the cmgs in ways that it hasn't before.

I can easily see how by reducing the ammount of boost in lower gears should help launch in the AT dramatically and even possibly the MT as well for the guys without LSD. Great Work as I know this is something the JB users have been asking for for some time. Its got to be better the using the AT clutch for traction control during WOT launches.

Soon the JB4 will be able to tell your meth controller when to turn on the meth and how much is needed so logic like that could be included at that time.

Mike

[digi19]

when will the jb4 be available for purchase?

[Bagelfast]

this is going to be fun... Less boost in first gear enough to get power down, then full boost rest of the gears!!!! or even a lil less in second. Def gonna be fun!

Keep up the testing, cant wait until its beta!

[BrianMN]

Are you sure the gears with 6MT are able to be known via CAN data?

[ExpensiveTaste]

Originally Posted by BrianMN

Are you sure the gears with 6MT are able to be known via CAN data?

If not, you could probably get a good guess with a little calculation dependant on speed and RPM.

[Rotary Rasp]

Originally Posted by ExpensiveTaste

If not, you could probably get a good guess with a little calculation dependant on speed and RPM.

very true.

[dlbrooks18]

Nice!

[Forcefed3]

Why not add ignition timing? It seems like that is the only thing missing.

[Tzu]

Originally Posted by gbreeE90

Why not add ignition timing? It seems like that is the only thing missing.

But then what would Mike and Shiv argue about?

[stren]

Originally Posted by Mike@N54Tuning.com

Nice little update on the JB4 front. It now has gear dependent boost control! Perfect for racing on street tires at the track or just staying in your lane around town. Here is a description of how it works and a short testing log.
Mike

Not trying to troll here, but is this the same as the procede's torque reduction in low gears? Does it work differently, does either taper with rpm?

[cn555ic]

Originally Posted by gbreeE90

Why not add ignition timing? It seems like that is the only thing missing.

That would require BMS to change out the entire circuit board to a new one like the one that their competitor is using..

[Mike@N54Tuning.com]

Originally Posted by stren

Not trying to troll here, but is this the same as the procede's torque reduction in low gears? Does it work differently, does either taper with rpm?

This is a proactive method for traction assist vs. the factory DTC or the procede's reactive method. Both have merits and uses. This has fewer potential side effects / safety concerns and works nicely with the factory DTC. But BMS is also working on a reactive method to supplement this for a future release.

Mike

[Mike@N54Tuning.com]

Originally Posted by BrianMN

Are you sure the gears with 6MT are able to be known via CAN data?

The value populates for manuals also! Not sure of the mechanics of how that works though. Check with BMS on that. I did send Terry some logs last night from my 6MT car but was too busy to follow up and it was snowing out so not sure how good/helpful the logs were.

Mike

[tofu-]

Originally Posted by Tzu

But then what would Mike and Shiv argue about?

pcb layouts!

[BrianMN]

Originally Posted by Mike@N54Tuning.com

This is a proactive method for traction assist vs. the factory DTC or the procede's reactive method. Both have merits and uses. This has fewer potential side effects / safety concerns and works nicely with the factory DTC. But BMS is also working on a reactive method to supplement this for a future release.

Mike

Cool to see progress.

FWIW, he was talking about the gear dependant boost feature the PROcede has, not the traction assist.

It seems this is very similar to the way the procede does it.

[dmurray14]

Originally Posted by Mike@N54Tuning.com

This is a proactive method for traction assist vs. the factory DTC or the procede's reactive method. Both have merits and uses. This has fewer potential side effects / safety concerns and works nicely with the factory DTC. But BMS is also working on a reactive method to supplement this for a future release.

Mike

That's an interesting way to put it, considering the procede has had gear dependent torque scaling for some time in addition to the recent wheelspin mitigation features.

[MisterSkiMask]

Originally Posted by dmurray14

That's an interesting way to put it, considering the procede has had gear dependent torque scaling for some time in addition to the recent wheelspin mitigation features.

....and Ford built cars before BMW, and so Cadillac, and Daimler, and...well I could go on but why do you really care?

[Mike@N54Tuning.com]

Originally Posted by BrianMN

Cool to see progress.

FWIW, he was talking about the gear dependant boost feature the PROcede has, not the traction assist.

It seems this is very similar to the way the procede does it.

Wrong guy to ask for that but I think theirs guesses the gear based on speed rather than obtaining the gear through the CAN diagnostics? Someone told me they dropped it for V5 anyway.

Mike

[dmurray14]

Originally Posted by MisterSkiMask

....and Ford built cars before BMW, and so Cadillac, and Daimler, and...well I could go on but why do you really care?

My point was that the procede has reactive AND proactive methods. So it's not really one versus the other. 2 vs 1.