BM3 Multimap stage 2+ question

Ivilla035 · 02-05-2023, 11:26 PM

Hello guys, I might've found something-

I'm currently running the multimap stage 2+ with a 200 cel high flow downpipe, TU pump, and the bm3 flex fuel kit. I usually keep it on the map 1 slot and let the flex kit adjust for the ethanol. But as I browsed the map settings, on map slot 1 (93), the max boost is 21. I usually keep it on this setting. But I checked the map slot 3 (e50) and the max boost is 23.9? Does this mean instead of just letting the flex fuel kit do its thing on map 1, I'd make more max power on the map 3 slot if I have at least e50 in the tank?

Or would it be the same for both?

I just checked the max boost level on the configure option.

Thanks!!

2016 340i

GENETICSUPERHUMAN · 02-06-2023, 12:03 AM

Interested in this as well.

My gut instinct is that with flexfuel detected the tune will let you go up to the max 23.9 assuming you have the boost limiter set to "OFF"

Ivilla035 · 02-06-2023, 12:07 AM

Quote:

Originally Posted by GENETICSUPERHUMAN

Interested in this as well.

My gut instinct is that with flexfuel detected the tune will let you go up to the max 23.9 assuming you have the boost limiter set to "OFF"

That's what I thought, but since the max would be 21 all the way turned up on slot 1, wouldn't this limit? I don't have my car here at school can someone do some trial and error????

GENETICSUPERHUMAN · 02-06-2023, 01:09 AM

Quote:

Originally Posted by Ivilla035

That's what I thought, but since the max would be 21 all the way turned up on slot 1, wouldn't this limit? I don't have my car here at school can someone do some trial and error????

okay, yeah so I don't know why I didn't think of this earlier but I just checked my logs and from pre-flexfuel and I was targeting 22.3 psi at 5500 RPM on E50 and on flexfuel map 1 I'm targeting 22.4.

all good, no boost limits here.

n55david · 02-06-2023, 09:26 AM

Max boost has nothing to do with your boost target in the map.. lol

Max boost is a manual boost limiter, if you turn it on and set it to a value etc

Ivilla035 · 02-06-2023, 10:10 AM

Quote:

Originally Posted by n55david

Max boost has nothing to do with your boost target in the map.. lol

Max boost is a manual boost limiter, if you turn it on and set it to a value etc

Ah. I should’ve just ran a log lol.

Ivilla035 · 02-06-2023, 10:21 AM

Quote:

Originally Posted by GENETICSUPERHUMAN

okay, yeah so I don't know why I didn't think of this earlier but I just checked my logs and from pre-flexfuel and I was targeting 22.3 psi at 5500 RPM on E50 and on flexfuel map 1 I'm targeting 22.4.

all good, no boost limits here.

Ah for sure. So if I mix e50 in, it won’t change if I’m on map slot 1, 2, or. 3?
Thanks for checking!!!!

Ivilla035 · 02-06-2023, 01:22 PM

Quote:

Originally Posted by GENETICSUPERHUMAN

Interested in this as well.

My gut instinct is that with flexfuel detected the tune will let you go up to the max 23.9 assuming you have the boost limiter set to "OFF"

f30_skrtt says he is going to make a video on it. I DMed him to test it.

MadToy · 02-06-2023, 04:21 PM

Quote:

Originally Posted by Ivilla035

f30_skrtt says he is going to make a video on it. I DMed him to test it.

Boost limiter on looks at the base maps Boost Ceiling. Off uses the Flex Fuel Boost Ceiling. At least this is what I've figured out with logging.

Ivilla035 · 02-06-2023, 04:30 PM

Quote:

Originally Posted by MadToy

Boost limiter on looks at the base maps Boost Ceiling. Off uses the Flex Fuel Boost Ceiling. At least this is what I've figured out with logging.

So should I keep it on, 23.9 seems like it would be high. Thats on the multimap slot. I thought that keeping it off would mean higher boost ceiling.

MadToy · 02-06-2023, 04:34 PM

Quote:

Originally Posted by Ivilla035

So should I keep it on, 23.9 seems like it would be high. Thats on the multimap slot. I thought that keeping it off would mean higher boost ceiling.

If stock turbo, odds are you'll never hit 23.9 anyway (other than a short overboost possibly).

Try it off and run a log to know for sure though.

Ivilla035 · 02-06-2023, 04:36 PM

Quote:

Originally Posted by MadToy

If stock turbo, odds are you'll never hit 23.9 anyway (other than a short overboost possibly).

Try it off and run a log to know for sure though.

Gotcha. I would always just use it on slot 1, but it seems moving to slot 3 will run more timing/boost/car go faster.

n55david · 02-07-2023, 07:14 AM

Quote:

Originally Posted by Ivilla035

So should I keep it on, 23.9 seems like it would be high. Thats on the multimap slot. I thought that keeping it off would mean higher boost ceiling.

Turn it off

designatedposter · 06-05-2023, 08:10 AM

Quote:

Originally Posted by GENETICSUPERHUMAN

okay, yeah so I don't know why I didn't think of this earlier but I just checked my logs and from pre-flexfuel and I was targeting 22.3 psi at 5500 RPM on E50 and on flexfuel map 1 I'm targeting 22.4.

all good, no boost limits here.

Quote:

Originally Posted by Ivilla035

Gotcha. I would always just use it on slot 1, but it seems moving to slot 3 will run more timing/boost/car go faster.

Ivilla035 how did you come to this conclusion when GENETICSUPERHUMAN said that even map 1 (with flex fuel enabled) targets 22.4psi?

gantona · 06-05-2023, 11:04 AM

On a side note,
When using multimap with FF, the target is always the max set by the map, but wgdc is reducing actual boost to match fueling capabilities.

As an exemple, if you’re using stage 1 multimap, with oem hpfp and running 85% Ethanol you will see in logs at low rpm boost actual is shortly reaching target but then lower below boost target by turning down wgdc.
I think this is part of the boost management algorithm on multimap to accommodate hpfp limits.

I was initially nervous seeing actual boost lower than boost target, but it seems normal.

Multimap boost management is very different than a normal tune.

02-05-2023, 11:26 PM	#1
Ivilla035 First Lieutenant 114 Rep 328 Posts Drives: 2016 340i RWD Join Date: Oct 2022 Location: San Diego iTrader: (0)	BM3 Multimap stage 2+ question Hello guys, I might've found something- I'm currently running the multimap stage 2+ with a 200 cel high flow downpipe, TU pump, and the bm3 flex fuel kit. I usually keep it on the map 1 slot and let the flex kit adjust for the ethanol. But as I browsed the map settings, on map slot 1 (93), the max boost is 21. I usually keep it on this setting. But I checked the map slot 3 (e50) and the max boost is 23.9? Does this mean instead of just letting the flex fuel kit do its thing on map 1, I'd make more max power on the map 3 slot if I have at least e50 in the tank? Or would it be the same for both? I just checked the max boost level on the configure option. Thanks!! 2016 340i Attached Images
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02-06-2023, 12:03 AM	#2
GENETICSUPERHUMAN Enlisted Member 39 Rep 38 Posts Drives: '19 440 GC xDrive Join Date: Jul 2022 Location: TX iTrader: (0)	Interested in this as well. My gut instinct is that with flexfuel detected the tune will let you go up to the max 23.9 assuming you have the boost limiter set to "OFF"
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02-06-2023, 09:26 AM	#5
n55david Check out my Youtube @n55david! 1296 Rep 3,533 Posts Drives: 2017 m240i, 2015 X3 x35i Join Date: Aug 2018 Location: Michigan USA iTrader: (0) Garage List 2017 m240i xDrive [0.00] 2015 X3 x35i [0.00] 2015 335i xdrive [0.00]	Max boost has nothing to do with your boost target in the map.. lol Max boost is a manual boost limiter, if you turn it on and set it to a value etc __________________ 2017 m240i xDrive 10.99@122.86mph bootmod3 stage 2+ ots 2015 335i xDrive 10.95@124.99mph w/bm3 - SOLD 2015 X3 x35i pwg 12.96 catless w/bm3 stage 2 93 ots IG: @n55david For pics and updates! Youtube: @ n55david For videos or Racing etc
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06-05-2023, 11:04 AM	#15
gantona Private First Class 48 Rep 190 Posts Drives: F31 340i (euro market) Join Date: Dec 2021 Location: France iTrader: (0)	On a side note, When using multimap with FF, the target is always the max set by the map, but wgdc is reducing actual boost to match fueling capabilities. As an exemple, if you’re using stage 1 multimap, with oem hpfp and running 85% Ethanol you will see in logs at low rpm boost actual is shortly reaching target but then lower below boost target by turning down wgdc. I think this is part of the boost management algorithm on multimap to accommodate hpfp limits. I was initially nervous seeing actual boost lower than boost target, but it seems normal. Multimap boost management is very different than a normal tune.
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