[Lancelot]

Well it's a Sony A7rII camera with an external Rode stereo microphone, not really your average setup. Not sure it's helpful to you.

[franzzz]

Lancelot news about JB4 on AH3 ?

[Lancelot]

Received, now reading through all horror stories of fried sensors and DMEs... just wondering if it's worth the trouble, instead of just going to BR for a remap.

[frackje]

Yesterday tested against a Scirocco stage 3 370hp. I won by one car length.
And than I tested against E90 LCI 335i N55 JB4 Stage 2 (approx 360hp-380hp). I won with two car lengths.

[Lancelot]

Hehe chuckling as I read this
Now what about an M3?

[frackje]

That's a good question. Hope to find an M3/M4 that wants to try.

[franzzz]

Wow

This is my custom exhaust maded by Ragazzon (italian Exhaust )

[franzzz]

Originally Posted by frackje

Yesterday tested against a Scirocco stage 3 370hp. I won by one car length.
And than I tested against E90 LCI 335i N55 JB4 Stage 2 (approx 360hp-380hp). I won with two car lengths.

Fantastic !!!!!

[franzzz]

Originally Posted by Lancelot

Received, now reading through all horror stories of fried sensors and DMEs... just wondering if it's worth the trouble, instead of just going to BR for a remap.

remove the battery - Pole (the first up little battery) and install.
It's simple

[Lancelot]

Nice!

It sounds like a deeper exhaust note than the Akra, although it always depends on the microphone and the room etc. i like it very much.

Originally Posted by franzzz

Wow

This is my custom exhaust maded by Ragazzon (italian Exhaust )

[franzzz]

Originally Posted by Lancelot

Nice!

It sounds like a deeper exhaust note than the Akra, although it always depends on the microphone and the room etc. i like it very much.

Yes very very deep: It's a full inox exhaust without resonator.

Incredible "louder" from 1000 to 3000 revs

[Lancelot]

Originally Posted by franzzz

remove the battery - Pole (the first up little battery) and install.
It's simple

Which one do you mean? We have two batteries in the trunk, if yours is like mine, attached to the same pole at the rear, and a pain to remove because hard to access (I find)

[franzzz]

Originally Posted by Lancelot

Which one do you mean? We have two batteries in the trunk, if yours is like mine, attached to the same pole at the rear, and a pain to remove because hard to access (I find)

Just remove only the "-pole" from the first little battery.

[Lancelot]

The JB4 is ON! Installation was way, way easier than when I did my TPMS retrofit, or installed an aftermarket audio amp

Works like a charm, no dyno of course but supposed to be 400hp now, it feels much more edgy, I haven't pushed too hard yet, 1 hour / 50km mixed driving styles.

As others have said, lower rpm feels stronger.

Eco pro works unchanged, perhaps stays at lower Rpm thanks to the increased torque.

No codes in the JB4 app.

[frackje]

Nice! I'm looking forward to your tacho video 0-200!

[frackje]

Ps: I wouldn't count on 400. A friend of mine got a M135i and installed JB4 two weeks ago.
Jb4 stage 1: 320 on the dyno. Stage 2: 340 on the dyno. That's the reason I didn't go with the JB4... I think you should aim for +/- 365.

[Lancelot]

Meh! You're spoiling the fun

I don't care, it makes me smile

But anyhow, the plan remains to go to BR performance sometime in the future, perhaps a little later, when warranty expires in a year.

In any case i do believe that a reprog will always have an edge over a piggyback like jb4, because it has access to all parameters.

However the jb4 lets me switch maps and gives me plenty of info on my iPhone which is great.

[Lancelot]

Originally Posted by frackje

Ps: I wouldn't count on 400. A friend of mine got a M135i and installed JB4 two weeks ago.
Jb4 stage 1: 320 on the dyno. Stage 2: 340 on the dyno. That's the reason I didn't go with the JB4... I think you should aim for +/- 365.

I used to have an m135i and it was 320hp stock, 320 with jb4 seems low - and dynos should always be relative to a baseline, not absolute.

By the way - the AH3 feels like it pulls much more than the M2 i tried the other day which is 370hp.

So happy enough for now.

Now on to map 5 to see if it learns something, presumably the akrapovic and exhaust will give it more room to breath

[Lancelot]

Originally Posted by frackje

Nice! I'm looking forward to your tacho video 0-200!

Hmm i don't think i can do that, not until my next track session at least - no autobahn here.

[franzzz]

Wait for 0-200 video or mlaptimer performance.

[frackje]

Originally Posted by Lancelot

Hmm i don't think i can do that, not until my next track session at least - no autobahn here.

Here is also no autobahn. But some good roads.
It will only take around 15 seconds.

[Lancelot]

OK so here are some approximate dyno tests -
disclaimer: they were done with an iphone app called PerfExpert, which measures using the internal accelerometer of the iphone and deduce the torque and power curves, and as such are quite approximative, as you get the headwinds that you don't have on a dyno, etc, I don't even know how the revs are estimated.

Torque seems about right, hp seem overestimated and i'm not sure why, I might have got one of the parameters wrong.

Anyway, you still get the before/after comparison

Measure 1: Stock
383hp / 477Nm estimated
curve here:

Measure 2: JB4 Map 5 (auto learning)
433hp / 557Nm estimated
curve here:

So with the approximations etc the measures are on the high side, but the difference is there, with +50hp estimated, so it seems not as efficient as frackje's tune, but close enough.

What I'm not sure is how efficient is this auto learning map 5 compared to the standard fixed map 1.