JB4 Thread for Lotus Emira AMG i4 (M139 Engine) – Tuning, Setup, Results & Support

[F1 SML8R]

@Kaz As always, get'n it done! @docron Hurry, you're falling behind!

 

[Milk242]

I bought the pre-bunged Weistec charge pipe to save some time, here is the pipe compared to stock. It's always post intercooler with methanol injection to not only chemically cool but to clean the combustion chamber, valves, piston heads. I am using the pump and tank from Snow Performance, and the rest of the kit and electronics comes from Burger Motorsports as the JB4 will control the system. So I'll be able to run stock, 91, 93 etc and also those maps + methanol (super handy) which means if I'm in a trip and don't want to bring methanol I can just run whatever map.
View attachment 68009

Wait I thought this was post intercooler?

 

[Kaz]

Wait I thought this was post intercooler?

View attachment 68013

I'll ask shop today where they are putting the injector - wonder why Weistec has it pre, maybe because there isn't enough length post and all the sensors - will start different thread for the build so it doesn't clog up this JB4 thread

 

[HankRS225]

360bhp I4 after JB4: (using Ron98 aka 93AKI)
Map1: +37whp, +36NM
Map2: +53whp, +48NM
Map3: +56whp, +65NM
Map4 above: no test

Ron98 is not enough for Map3, the torque difference only works in the low rpm range (3-4.5k rpm)
Anyway, now the car is blistering fast, definely worth it.

 

[TurboTambo]

I bought the pre-bunged Weistec charge pipe to save some time, here is the pipe compared to stock. It's always post intercooler with methanol injection to not only chemically cool but to clean the combustion chamber, valves, piston heads. I am using the pump and tank from Snow Performance, and the rest of the kit and electronics comes from Burger Motorsports as the JB4 will control the system. So I'll be able to run stock, 91, 93 etc and also those maps + methanol (super handy) which means if I'm in a trip and don't want to bring methanol I can just run whatever map.
View attachment 68009

That pipe has to be worth a few extra HP on its own.

 

[Lotus F1]

360bhp I4 after JB4: (using Ron98 aka 93AKI)
Map1: +37whp, +36NM
Map2: +53whp, +48NM
Map3: +56whp, +65NM
Map4 above: no test

Ron98 is not enough for Map3, the torque difference only works in the low rpm range (3-4.5k rpm)
Anyway, now the car is blistering fast, definely worth it.

Is this your own independent dyno testing?

 

[HankRS225]

Is this your own independent dyno testing?

Yes

 

[Lotus F1]

Wow pretty good, very accurate on the map3 whp I checked with Burgers number. It was within 1whp difference.

Shame there is no way to unluck the 40hp they took on you guys outside the US

 

[Andy H]

Shame there is no way to unluck the 40hp they took on you guys outside the US

Still dreaming of the full ECU unlock one day....

 

[vito2279]

Thinking about getting the JB4 and I have a quick question. I see the hardest connection appears to be the one by the intercooler. I don't have access to a lift. I ordered an exhaust for my I4 and I'm wondering if when the shop installs the exhaust, should I just go ahead and have them install the JB4 while they're down there. Thoughts?

 

[Lotus F1]

Thinking about getting the JB4 and I have a quick question. I see the hardest connection appears to be the one by the intercooler. I don't have access to a lift. I ordered an exhaust for my I4 and I'm wondering if when the shop installs the exhaust, should I just go ahead and have them install the JB4 while they're down there. Thoughts?

It really depends on how long you want to wait. I don't have a lift either I simply went to the local automotive supply store and got ramps and I did the installation the way CSI suggested. Which is to remove the bolts to the AC compressor slide over the belt to get access to that intercooler map sensor. Alternatively the way Burger Motorsports did it was to approach it by removing partially the intercooler itself. I am not sure which is easier but I get the feeling disconnecting the alternator way maybe easier. That said the most important thing is to just to have the right tools as that will save you a lot of time. For me it was the right size sockets and a breaker bar for loosening the tensioner on the pulley

 

[Kaz]

It really depends on how long you want to wait. I don't have a lift either I simply went to the local automotive supply store and got ramps and I did the installation the way CSI suggested. Which is to remove the bolts to the AC compressor slide over the belt to get access to that intercooler map sensor. Alternatively the way Burger Motorsports did it was to approach it by removing partially the intercooler itself. I am not sure which is easier but I get the feeling disconnecting the alternator way maybe easier. That said the most important thing is to just to have the right tools as that will save you a lot of time. For me it was the right size sockets and a breaker bar for loosening the tensioner on the pulley

my shop moved the AC compressor but they also have the rear of the car kind of apart...tech did say it was a bitch and he feels bad for someone trying to do this themselves in their garage, not impossible but hard lol.

 

[Aforst]

E30. Car feels great.

 

[675430VME]

E30. Car feels great.

May I ask how much did you pull on stock? I am planning to do Mainline also.

 

[Aforst]

One of the stock pulls. Another had slightly less torque but almost identical HP. This might have been map 0. With GRP downpipe.

 

[hellasf1]

For anyone interested in official numbers, here are the dyno results published by Burger Motorsports for the JB4 on the Lotus Emira AMG i4 (M139):

Dyno Results:

• Baseline (91 Octane): 387.5 hp / 311.5 lb-ft
• JB4 Map 1 (91 Octane, IAT Spoof): 422.9 hp / 354.9 lb-ft
• JB4 Map 2 (93 Octane): 439.2 hp / 351.6 lb-ft
• JB4 Map 3 (93 Octane): 444.3 hp / 355.4 lb-ft
• JB4 Map 4 (E30 Blend): 456.9 hp / 371.3 lb-ft

Here’s the dyno chart provided by Burger Tuning:
View attachment 67860

And for those who want to see the full testing process, check out this video from Burger Motorsports with all the dyno runs and data:
JB4 for Lotus Emira AMG i4 Dyno Results & Testing – YouTube

Is this wheel figures or converted to crank?

 

[675430VME]

One of the stock pulls. Another had slightly less torque but almost identical HP. This might have been map 0. With GRP downpipe.

Seems like the downpipe has pretty good performance gain, I have a full exhaust and a dry filter upgrade as well. Your baseline is very helpful, thx bro!