[GixY2K]

Originally Posted by Sbm007

Does the JB4 still have issues in Sport Plus mode with respect to throttle closures? I heard there was going to be a firmware update to address that - does anyone know?

I believe that the consensus is 'yes', it still has this issue. And that is why it is slightly faster in Eco vs. S+.

[Sbm007]

Originally Posted by GixY2K

I believe that the consensus is 'yes', it still has this issue. And that is why it is slightly faster in Eco vs. S+.

Thanks! I want to get my ECU tuned but femtoevo are not accepting any ECU's unless within EU.

So was thinking of going down the JB4 route for time being but think I'll just hold off until Femto have sorted the logistics issue out

[mike@x-ph.com]

Please note the throttle closure issues are not confirmed by BMS.

per BMS they did not have any throttle closure with the G8x and none of their logs showed any issue with throttle closure

[Sbm007]

Originally Posted by mike@x-ph.com

Please note the throttle closure issues are not confirmed by BMS.

per BMS they did not have any throttle closure with the G8x and none of their logs showed any issue with throttle closure

That's good to hear - am I being unrealistic if I were to expect something like a 90 whp increase using 93 octane with JB4 on map 3?

Probably with map 5 if it is possible but I don't have access to custom E blends.. I only get 99 RON fuel (which is like 93 octane) so map 5 may not work?

[mike@x-ph.com]

Originally Posted by Sbm007

That's good to hear - am I being unrealistic if I were to expect something like a 90 whp increase using 93 octane with JB4 on map 3?

Probably with map 5 if it is possible but I don't have access to custom E blends.. I only get 99 RON fuel (which is like 93 octane) so map 5 may not work?

I would expect around 70 whp increase with Jb4 map 3 , add an intake for an additional 15 whp

[translux]

Originally Posted by mike@x-ph.com

Please note the throttle closure issues are not confirmed by BMS.

per BMS they did not have any throttle closure with the G8x and none of their logs showed any issue with throttle closure

I know that's what they're saying and given my many years of experience with the guys at Burger Motorsports I trust what they're saying. However I've seen two different sets of dyno data on two different cars that showed more power with the JB4 using efficient mode. I do believe both had aftermarket intakes so not sure if that had any impact. In any case I'm going to install mine as soon as I put the summer tires back on and will report back.

[Sbm007]

Originally Posted by mike@x-ph.com

I would expect around 70 whp increase with Jb4 map 3 , add an intake for an additional 15 whp

Nice that's a very reasonable increase IMO - I have MST intakes + 200 cell downpipes - so hopefully I can get close to 90 whp then!

[0Camus0]

Originally Posted by translux

I know that's what they're saying and given my many years of experience with the guys at Burger Motorsports I trust what they're saying. However I've seen two different sets of dyno data on two different cars that showed more power with the JB4 using efficient mode. I do believe both had aftermarket intakes so not sure if that had any impact. In any case I'm going to install mine as soon as I put the summer tires back on and will report back.

I can confirm the throttle closures, and yes it's slightly better in comfort, but you lose the pedal quick response:

Comfort: https://datazap.me/u/000camus000/e30...g=0&data=1-4-9

Sport+: https://datazap.me/u/000camus000/e30...g=0&data=1-4-9

Compared to the Bootmod3 91 OTS map: https://datazap.me/u/000camus000/m4-...g=0&data=11-40

I don't really know if Jb4 could do something to remove the throttle closures, looks like the torque limits are hit at the DME level, because I used 91, 91 + E, E30 and the results were the same.

[Sbm007]

Originally Posted by 0Camus0

I can confirm the throttle closures, and yes it's slightly better in comfort, but you lose the pedal quick response:

Comfort: https://datazap.me/u/000camus000/e30...g=0&data=1-4-9

Sport+: https://datazap.me/u/000camus000/e30...g=0&data=1-4-9

Compared to the Bootmod3 91 OTS map: https://datazap.me/u/000camus000/m4-...g=0&data=11-40

I don't really know if Jb4 could do something to remove the throttle closures, looks like the torque limits are hit at the DME level, because I used 91, 91 + E, E30 and the results were the same.

Thanks for the data logs - I have PMd you hope you don't mind

[mike@x-ph.com]

Originally Posted by 0Camus0

I can confirm the throttle closures, and yes it's slightly better in comfort, but you lose the pedal quick response:

Comfort: https://datazap.me/u/000camus000/e30...g=0&data=1-4-9

Sport+: https://datazap.me/u/000camus000/e30...g=0&data=1-4-9

Compared to the Bootmod3 91 OTS map: https://datazap.me/u/000camus000/m4-...g=0&data=11-40

I don't really know if Jb4 could do something to remove the throttle closures, looks like the torque limits are hit at the DME level, because I used 91, 91 + E, E30 and the results were the same.

Thank you for sharing, I will send it to BMS

[translux]

Originally Posted by 0Camus0

I can confirm the throttle closures, and yes it's slightly better in comfort, but you lose the pedal quick response:

Comfort: https://datazap.me/u/000camus000/e30...#38;data=1-4-9

Sport+: https://datazap.me/u/000camus000/e30...#38;data=1-4-9

Compared to the Bootmod3 91 OTS map: https://datazap.me/u/000camus000/m4-...#38;data=11-40

I don't really know if Jb4 could do something to remove the throttle closures, looks like the torque limits are hit at the DME level, because I used 91, 91 + E, E30 and the results were the same.

How's the performance of JB4 vs bootmod3?

[Soylent]

Haven't they had a map in alpha stage for a few months that smoothed out those throttle closures?

[0Camus0]

Originally Posted by translux

How's the performance of JB4 vs bootmod3?

Even for an OTS map, it's night and day. I remember the first impressions from the first owners saying that the feel of the car was more "naturally aspirated".

Well, that is because of the throttle closures, if you see the logs, it opens up in the top end, so you feel the car pulling harder the closer you get to redline.

Now with the tune, is just a bit of lag, but when the turbos spool, they push you back from the middle range all the way to the top. It feels now closer to how the S55 used to feel, but with way more top end.

JB4 is just more power in the top end, since the low to mid range is really moderated by the throttle closures. I can see why JB4 make for good numbers in dyno and 60 - 130, it's because the power is where it should be, in the top end. However, gaining back the low to mid range is addictive

[GixY2K]

Originally Posted by 0Camus0

I can confirm the throttle closures, and yes it's slightly better in comfort, but you lose the pedal quick response:

Comfort: https://datazap.me/u/000camus000/e30...g=0&data=1-4-9

Sport+: https://datazap.me/u/000camus000/e30...g=0&data=1-4-9

Compared to the Bootmod3 91 OTS map: https://datazap.me/u/000camus000/m4-...g=0&data=11-40



I don't really know if Jb4 could do something to remove the throttle closures, looks like the torque limits are hit at the DME level, because I used 91, 91 + E, E30 and the results were the same.

Great telemetry and assessment of the different behaviors (on your last post), thank you for sharing it!

I'm currently at RC mod-level. I feel JB4 is a good interim solution while we wait for the full DME unlock process to come to the U.S. (hopefully w/ current situation, FemtoEvo will bitcoin-sell the formula to someone local)
I was actually a click away from getting my JB4, but an opportunity came up to get the RC for less than 1/2 of its price. My only complain with the RC is that apparently it can only be sold or programmed on a different car one time. After that, I believe you have to pay to have additional cars added (maybe someone can chime in with better info)

[mike@x-ph.com]

Originally Posted by GixY2K

My only complain with the RC is that apparently it can only be sold or programmed on a different car one time. After that, I believe you have to pay to have additional cars added (maybe someone can chime in with better info)

you can use it on as many cars as you want, no need to pay

[Jon H]

Just finished the install. What a bitch that tmap sensor part is! lol
Found that it was pretty easy to unplug the tmap sensor using one pick to push down on the released tab and another pick to pop the plug off. I had more trouble connecting the JB4 tmap connections. THAT was frustrating.

Previous owner didn't unlock the unit so I'm waiting back from BMS. Or if I can get the previous owner to log in and unlock for me. Any issue driving around until it's unlocked? Does it just default to Map 0?

[Flying05]

Originally Posted by GixY2K

Just as a reference, my BMW dealer was going to charge me $400. Which, if you decide to do it on your own, you'll see it is well justified

Am I missing something here, but why would a dealership install this thing knowing that BMWNA wouldn't cover your blown motor if that happened? I thought dealerships only did installs on OEM parts. Especially not piggy back tuning devices.

[mike@x-ph.com]

Originally Posted by Jon H

Just finished the install. What a bitch that tmap sensor part is! lol
Found that it was pretty easy to unplug the tmap sensor using one pick to push down on the released tab and another pick to pop the plug off. I had more trouble connecting the JB4 tmap connections. THAT was frustrating.

Previous owner didn't unlock the unit so I'm waiting back from BMS. Or if I can get the previous owner to log in and unlock for me. Any issue driving around until it's unlocked? Does it just default to Map 0?

It will default on the previous map the previous owner had; depending on his mods, it might be unsafe to push your car with the JB4 until it's changed. You are safe if you drive moderately (under 3K RPM).

Originally Posted by Flying05

Am I missing something here, but why would a dealership install this thing knowing that BMWNA wouldn't cover your blown motor if that happened? I thought dealerships only did installs on OEM parts. Especially not piggy back tuning devices.

Some dealerships install aftermarket parts but considering that they will cover it with an extended warranty, I don't see why you would want to pay the dealership hourly rate when you get any mechanic to do it for half the price.

[Jon H]

Originally Posted by mike@x-ph.com

It will default on the previous map the previous owner had; depending on his mods, it might be unsafe to push your car with the JB4 until it's changed. You are safe if you drive moderately (under 3K RPM).

Thanks Mike. Good call

[E_R_S_M4_Comp]

I've had a BMS Stage 1 on my past 2 BMW's (550i and F82 M3). I just received my third on for my G82 and, to be honest, I am a little worried about this one. In the past, I 've always taken it out before my car would go in for service and I never had an issue. I would probably still do this on my G82 (which I know, is a PITA). However, I am reading about some footprints being left behind even after the device is removed that could get me black listed. Is there any validity to this?

[LongBeachDinanFan]

Originally Posted by E_R_S_M4_Comp

I've had a BMS Stage 1 on my past 2 BMW's (550i and F82 M3). I just received my third on for my G82 and, to be honest, I am a little worried about this one. In the past, I 've always taken it out before my car would go in for service and I never had an issue. I would probably still do this on my G82 (which I know, is a PITA). However, I am reading about some footprints being left behind even after the device is removed that could get me black listed. Is there any validity to this?

No one is going to guarantee anything but it's hard to find evidence anyone with a JB4 has ever been flagged. I saw in their latest firmware notes they made changes for deleting shadow codes so it might be a cat and mouse thing at this point too.

[mike@x-ph.com]

Originally Posted by E_R_S_M4_Comp

I've had a BMS Stage 1 on my past 2 BMW's (550i and F82 M3). I just received my third on for my G82 and, to be honest, I am a little worried about this one. In the past, I 've always taken it out before my car would go in for service and I never had an issue. I would probably still do this on my G82 (which I know, is a PITA). However, I am reading about some footprints being left behind even after the device is removed that could get me black listed. Is there any validity to this?

Originally Posted by LongBeachDinanFan

No one is going to guarantee anything but it's hard to find evidence anyone with a JB4 has ever been flagged. I saw in their latest firmware notes they made changes for deleting shadow codes so it might be a cat and mouse thing at this point too.

+1

Add to that; that the dealership will not care about any modification unless you are asking them to fix the damage caused by your mod for free.

In the very, very rare instance that a mod caused damage to another car component, you should not take the car to the dealership and ask them to fix it. The chances of this scenario are very close to zero, I would not worry about it.