BMS power box

[Vetracr]

I have a 3.0is E89 6 speed that I use for track day events. On those occasions I turn off the DTC nannie controls so I am driving the car, not the computer. I am looking at the Burger BMS power box which increases the sensitivity of the throttle and increases power by modifying the fuel and ignition map. My question is does anybody have any experience with this unit and if so, what is your opinion? A second question is does anyone really know how the box changes the fuel and timing maps? Modern ECM computers have hundreds of maps and correction algorithms for different conditions. I'm guessing the Burger tuner applies a fixed fuel and timing correction based on the rpm and load signal it gets from the factory ECM. Does anyone know exactly how this unit works? I'm particularly interested in the target WOT AFR. I'm guessing BMW has it tuned lean for mileage, not performance. I beta tested software for a tuner with my Cosworth Miata so I have some experience in this area. TIA.

[rjahl]

Originally Posted by Vetracr

I have a 3.0is E89 6 speed that I use for track day events. On those occasions I turn off the DTC nannie controls so I am driving the car, not the computer. I am looking at the Burger BMS power box which increases the sensitivity of the throttle and increases power by modifying the fuel and ignition map. My question is does anybody have any experience with this unit and if so, what is your opinion? A second question is does anyone really know how the box changes the fuel and timing maps? Modern ECM computers have hundreds of maps and correction algorithms for different conditions. I'm guessing the Burger tuner applies a fixed fuel and timing correction based on the rpm and load signal it gets from the factory ECM. Does anyone know exactly how this unit works? I'm particularly interested in the target WOT AFR. I'm guessing BMW has it tuned lean for mileage, not performance. I beta tested software for a tuner with my Cosworth Miata so I have some experience in this area. TIA.

The modern DME has thousands of maps and scalers . The MSV 70 has over 8,000. I'm sure the more advanced MSD80 has more. I have not had the E89 long enough to take a hard look , yet.

If you really want to know what the BMS box can do, look at the wiring diagrams. I bet you will find that the box intercepts the throttle, O2 and RPM. Really, what can you do with that? Not much

Even if the box was smart enough to spoof the right fuel targets, it would need maps for every engine and every version. So you really get a throttle remap and pot luck with fuel values.

Get a real tune that can make real changes to the drivers wish maps, fuel targets, vanos , ignition timing and turbo specific tuning.

My two cents

[NoQuarter]

Don't waste you energy on that.

Get MHD and flash your DME rather than try and fake it out by modifying signals.

[Vetracr]

Originally Posted by NoQuarter

Don't waste you energy on that.

Get MHD and flash your DME rather than try and fake it out by modifying signals.

MHD doesn't have an N52 application.

[rjahl]

Originally Posted by Vetracr

MHD doesn't have an N52 application.

You post confused me. You have a z43.0i manual.


Go to the E90 section for naturally aspirated motor mods. And read up, lots of good information.

In short you best options will be to add the CobraMarty MILFs for more intake valve lift. Headers if you can and the a good MAF less tune from BPC.

You have a heavy car the the N52 so it needs all the help it can get. Maybe look at a diff swap from an auto to change your final drive ratio.

Oh ya, lots of exhaust work discussion as well.

[NoQuarter]

Originally Posted by rjahl

You post confused me. You have a z43.0i manual.

Same here. I looked at it a couple times then gave the edge to the s in the model

Going to be tuff to do much with the N52 engine. I'd say go for suspension upgrades and leave the engine alone.

[rjahl]

Originally Posted by NoQuarter

Same here. I looked at it a couple times then gave the edge to the s in the model

Going to be tuff to do much with the N52 engine. I'd say go for suspension upgrades and leave the engine alone.

I put 180,000 Miles on my N52 powered E85 and wrote my own tunes. It does respond to tuning but you will not get much with a tune alone. Maybe 15RWP.

Add on's + tune are the ticket. Axiom is running about 250 RWHP on his. I'd say that that his 3 series coup pulls really hard. He certainly added the fun factor back into that car. Search his posts to see what he's done.

DigiDon bolted on a single turbo and you would be surprised how much power the N52 can really produce. He was getting something like 500RHP with stock internals. Great read.

BPC, bolted on an N54 intake manifold and moved the RPM limits above 7,600 RPM, Project Alice. Another good read.

[NoQuarter]

Originally Posted by rjahl

I put 180,000 Miles on my N52 powered E85 and wrote my own tunes. It does respond to tuning but you will not get much with a tune alone. Maybe 15RWP.

Add on's + tune are the ticket. Axiom is running about 250 RWHP on his. I'd say that that his 3 series coup pulls really hard. He certainly added the fun factor back into that car. Search his posts to see what he's done.

DigiDon bolted on a single turbo and you would be surprised how much power the N52 can really produce. He was getting something like 500RHP with stock internals. Great read.

BPC, bolted on an N54 intake manifold and moved the RPM limits above 7,600 RPM, Project Alice. Another good read.

All sounds like fun projects!

Not for the novice but great results when given the proper effort.