BM3 + JB4 meth
 

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.

Thanks

james

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!

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

Yes to start, the default settings

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.

James

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

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!

Thanks

James

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

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

James