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-   -   BM3 + JB4 meth (https://www.n54tech.com/forums/showthread.php?t=62595)

jamesmurray 07-07-2020 01:59 PM

BM3 + JB4 meth
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Hi, I've been running a stage 2 BM3 flash on my M240i for the past few months and in the never ending quest for more speed I thought I'd best put my old BMS meth kit to good use (previously fitted to my N54 335). I bought a used JB4 with EWG and have just fitted it today. I would like to run the JB4 either as a standalone meth controller or use map 7 if possible with a small boost additive.

I've been reading through many of the posts on the forum, but I'm not entirely clear of the settings I would need to run for either setup. Could anybody help with the most up-to-date settings that I could use?

I've added a Map 0 log (traction issues in 3rd!) for reference before I start installing the meth kit.



Terry @ BMS 07-07-2020 05:50 PM

I'd suggest using map7 so boost is increased over the flash target as a function of meth flow. Start with a 65 additive and we can evaluate from there!

jamesmurray 07-08-2020 04:46 AM

Thanks for the reply Terry. I guess I leave both meth safety and trigger set to 0?

Terry @ BMS 07-09-2020 04:38 PM

Yes to start, the default settings

jamesmurray 07-20-2020 01:47 PM

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So after a bit of a delay, I've managed to install the meth system into the car. For initial testing I'm using a cm7 nozzle (but I've got additional nozzles to upgrade to) with a 65 additive. It looks like that's too high from the logs as it's causing some timing issues and the hpfp to dip. Shall I lower the additive and increase to dual cm7 nozzles? Are there any other adjustments I need to make? Also it seems that the meth flow is dropping over the course of a pull. The tank is a little low so it may be that.

Thanks for all of the help so far.


Terry @ BMS 07-20-2020 03:24 PM

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I'd try getting the meth levels up with dual nozzles and/or a stronger mix to evaluate.

jamesmurray 07-21-2020 06:12 AM

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Thanks for the help Terry. I've fitted the extra nozzle so I'm now running dual cm7's, although I think there might be some air in the line as it's still falling off up top. Is there a way to bleed the air out other than using the purge button? Can I use the gas pedal method like in the n54's?

Here's the log from earlier, I started with a 45add and then went up to 55 towards the end of the log. Traction is now becoming a problem in 3rd, so it's time for better tires!



Terry @ BMS 07-21-2020 02:06 PM

Looks generally good to me here. Anything over 60 on meth flow is full flow so not too bad up top.

jamesmurray 07-21-2020 02:41 PM

That's good to hear Terry, thanks for your help.


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