Search results

Thanks for the feedback! Using JB4 PRO with the BT dongle installed at JB4?

Yeah! Even with just the Mach5 downpipe, the sound at full throttle is already amazing — aggressive and sharp! And the pops during gear shifts and deceleration are absolutely out of this world. I can only imagine how insane it would sound with an upgraded rear muffler too.. hehe :-D

That's great! 400 hp US version? At crank, right? Thank's for sharing! JB4 just arrived. Gonna mount it this week. Already installed the MACH5 GPF off, sports cat. It was a PITA to remove the original one..

LTFT at 34% ??? God... that's a lot! How much more boost is it making? I'm currently waiting for the JB4 to arrive so I can run some tests. In the meantime, I've been checking the wiring and I’m planning to tap into the CAN bus near the engine bay instead of running a cable all the way to the...

Thank you!! I believe you’ve already tested E30 on the Emira — mind sharing which JB4 map you used for it? Also curious to know: Any noticeable performance gains? Did you log fuel trims or AFRs? How’s the cold start and driveability? Would be great to know how the M139 reacts to E30 on the...

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...

Hi all, For those specifically interested in the JB4 for the AMG i4 (M139) engine, I’ve just created a dedicated thread so we can keep all the info, tips, results, and troubleshooting in one place: 👉 JB4 Thread for Lotus Emira AMG i4 (M139 Engine) – Tuning, Setup, Results & Support Let’s use...

Hi everyone, I noticed that most JB4 discussions here are mixed between the V6 and the AMG i4 engines, which can make it difficult to find specific info for each setup. To help keep things organized and easy to access, I’m starting this dedicated thread for everything related to the...

Went for a drive… ended up at the bar. Water bar. 😅

From what I know, the Emira i4 US and China versions do not have OPF/GPF, but they do have a typical catalytic converter and that’s actually one of the reasons they come with slightly more power compared to the EU versions. In Europe, they definitely have OPF/GPF — I’ve done some diagnostics on...

12 mm spacers all around from PCD.

Hey, I’ve got the I4 as well — mine’s at around 3,000 miles now. I’ve experienced that “jerky” launch thing maybe 2 or 3 times so far, always when starting from a stop in slow traffic. It does feel a bit like a weird delay or hesitation, and then suddenly it surges forward more than expected —...

Yes, exactly — same M139 engine as in the W177 A45 AMG. I actually watched a video on YouTube showing the engine number location on the W177, but it seems like it's not in the same place on the Emira. I’ve checked around the areas shown in the video, but no luck so far. If anyone has located it...

Hi everyone, Does anyone know where exactly the engine number is located on the Lotus Emira i4 with the AMG-sourced M139 engine? I've checked around the engine bay but couldn’t find it easily. Any photos, diagrams, or detailed descriptions would be greatly appreciated. On the workshop manual...

Hi NSXer, No problem at all — that setup will work perfectly. The positive connector is directly linked to the battery terminal, and the other connection is to ground/chassis, which is completely safe and standard. It’s just a cleaner and more discreet installation, but it charges the battery...

Hi, I don't have a specific part number for the cable, as it comes pre-attached to the panel in the kit — you only need to connect it directly to the battery. Cheers!

That's pretty awesome! Congrats! :-D What's the setup of the car?

Absolutely, makes total sense. Over here in Europe, we’re stuck with the GPF right after the turbo, which kills most of the sound and seriously restricts the flow—even with a hi-flow cat or aftermarket exhaust, the GPF is the biggest limiter for both sound and throttle response. Honestly, if we...

Tried that... doesn't do a thing! At least on mine.

The i4 Emira has a GPF in the exhaust, so there’s no way a cat-back alone gives anywhere near 10% more power. That’s seriously optimistic. Real gains will only come once it’s possible to remove the DPF and tune the ECU (which isn’t doable yet because of the MG1). Until then, the exhaust is...

Does the RESET button on the stalk in the Lotus Emira have any function other than service reset? Mine doesn’t seem to do anything else.

Hi all, After a long process of logging, decoding, and testing — I’ve finally achieved full access to the CAN-FD data on the Lotus Emira. This includes real-time values like engine RPM, coolant and oil temperatures, throttle position, boost pressure, torque, and much more — all directly from the...

Hi everyone, I'm reaching out to ask if any fellow Emira i4 owners have successfully obtained the Certificate of Conformity (CoC). I purchased my Emira i4 from a Lotus dealer in Sweden, and when I contacted them about the CoC, they informed me that this request should be handled by Lotus...

Much appreciated! Sooner or later i'm going to have to remove this one! :-)

Hi all! Just fitted a CTEK Comfort Connect Panel to my Emira i4 — thought I’d share in case anyone’s considering the same. I didn’t want to remove the battery cover every time I needed to top up the battery (especially with these modern ECUs getting touchy with low voltage), so this little...

Unfortunately, the oil temperature isn’t available on the Emira’s dashboard — not even in the sport or track modes. You can only access that info by pulling data via OBD, using tools like OBDEleven, Torque Pro, or similar apps that read from the ECU. Bit of a shame, considering it’s such a...

Hi Neil, I purchased access to Lotus’s official Aftersales Portal, where the i4 service manual is available. It has all the technical documentation — procedures, torque specs, diagrams, etc. You can check it out here: https://dealerportal.uslotservice.lotuscars.com/

I’ve just completed the first oil change on the car (as recommended after the first 1,000 km). I followed the service manual procedure: fully drained the old oil and added exactly 6 liters. Bought 1 extra liter, just in case! The level is now spot on. ✅

Totally agree! Nothing beats the simplicity and reliability of an old dipstick. A little sight glass or dipstick backup would make so much sense… but like you said, common sense isn’t that common anymore.

Hey, just to share — I’ve had exactly the same experience with my Emira i4 (M139 engine). The oil level reading on the dash isn’t 100% reliable, especially when you're looking at small differences like 200–300ml. It can fluctuate depending on oil temperature, how level the car is, and whether...