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