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

[Rayjoedef]

Hi

Jb4 install yesterday.....5 sec after fire up, cel came on. Jb4 was locked and needed to submit ticket to unlock. Decreased power as of now. Any thoughts?

 

[virtualmacho]

Hi

Jb4 install yesterday.....5 sec after fire up, cel came on. Jb4 was locked and needed to submit ticket to unlock. Decreased power as of now. Any thoughts?

I don't have an i4 so can't offer much help, but I think it would be good to make sure all four (?) connectors are actually connected.

• Pushed all the way in?
• No pins bent or broken from previous unsuccessful attempts to connect?
• Did you remove any other cables during install?
• Anything melting?
• Does the car run with JB4 removed?

Hope you get it sorted out quickly.

 

[lynchy73]

Even though it may be the same engine, it's possible so much of it has changed that it's power output could be drastically different. Just because this engine makes more power in other applications, doesn't mean it can handle that in this application.

Matt Armstrong tried this with a GLC63 engine swap with his DBX. Both have the same M177 Engine, but when he broke them down, virtually none of it was the same. I think only the cylinder block was identical.

I hear you, but the V8 AMG engines do I believe come in various trim levels, turbo sizes etc. I’m pretty sure there is much more than just a tune separating the lowest power level AMG V8 and the higher power variants.

With the M139 (none electric turbo variant) I’m pretty certain they are all the same engine, with same turbo, no matter A45S, 360hp Emira or 400hp Emira SE.

However, I suspect the A45S running circa 420hp, will be more reliable long term and in all weather conditions on track, compared to a 360hp Emira, that’s been tricked via a piggy back to deliver that same 420hp.

Power is important, but so is good tuning and properly calibrated protection strategies to protect the engine when running at high boost. I’d personally be happy to run the JB4 on my 400hp I4, but I’d be nervous to hammer it on track on a hot day.