[Nugget]

And if you want to see how this tune performs under hard use, it coped with 20 minutes sessions no problem, performed flawlessly until I ran out of fuel.


Also the overlay isn’t accurate as the built in Garmin Virb GPS is pretty crap.

Was actually hitting up to 225kmh according to my lap timer, which is about 10-15kmh higher than what I was hitting with the Mission Performance tune.

[B58togo]

^^
Nice! I'm gonna be wrapping my hands around some alcantara goodness on Tuesday. Finally broke down and ordered the M Performance steering wheel.

[rednose]

Originally Posted by Nugget

Got the car on the dyno today to check out the off the shelf BM3 e30 map.

Car is a 2017 M140i, manual gearbox.
Engine mods
-BCS 100 cell catted downpipe
-K&N Drop in Filter with hot climate intake duct
-NGK spark plugs gapped down to 0.022”
Fuel is ~30% ethanol mixed with 98 ron.
Tune is BM3 OTS E30 stage 2

Car has been on this dyno twice before.

Visit 1 car was stock including downpipe.
Stock: 307whp
Mission Performance Stage 2 tune: 391whp

Visit 2 was after the down pipe was installed.
MP stage 2 with DP: 401whp

Visit 3 was today
BM3 e30 tune: 426whp
Log: http://www.bootmod3.net/log?id=5d1ebc93ae729b16a305fe38

Runs today and visit 2 were done in 5th gear. Unfortunately the runs on visit 1 were done in 4th gear so the graphs don’t overlay nicely.
I’ve overlayed the MP stage 2 tune (98ron) for comparison.
BM3 made 25 hp more on lower boost (MP:22psi, BM3:16psi) and held power better to redline.
Happy with that.

Are you happy with those afr's ?

I would try to richen it up a little, 11.8 - 12.0 is ethanol's sweet spot.

Cheers,

[kern417]

Originally Posted by rednose

Are you happy with those afr's ?

I would try to richen it up a little, 11.8 - 12.0 is ethanol's sweet spot.

Cheers,

afr is lambda based and translated to afr, so it's not accurate in logs once you start blending with ethanol. assume the same afr for 91/93 is good, because lambda will be equal despite the fuel you're running.

[rednose]

Originally Posted by kern417

afr is lambda based and translated to afr, so it's not accurate in logs once you start blending with ethanol. assume the same afr for 91/93 is good, because lambda will be equal despite the fuel you're running.

I would be 99% sure that dyno is reading in gas scale, which converts to .87 lambda.

I know ethanol is a very forgiving fuel but I was just giving an opinion.

If that tune was to be fattened up to say .78 or even .8 lambda I would almost be certain that it would make more power and be safer aswell.

Would be interested to see what the OP thinks.

I am looking at purchasing a M140i and I will probably be doing the exact same mods.

OP has spent his money in all the right places.

[Nugget]

Originally Posted by rednose

Are you happy with those afr's ?

I would try to richen it up a little, 11.8 - 12.0 is ethanol's sweet spot.

Cheers,

Is that with direct injection engines?
I am comfortable with it and obviously BM3 is comfortable enough to release it for use on thousands of cars.
The stock tune is around 14:1 to redline.



In my past experience trying to custom tune a N55 it hated anything much richer than 13:1

[enemigo13]

Originally Posted by Nugget

In my past experience trying to custom tune a N55 it hated anything much richer than 13:1

hated why? because of weak hpfp. misfire because of fuel pressure drop. if you have ~1.2 bar at 6000+ rpm running 98 pump fuel 1:13 is not the best choice, should have 1:12.5 at least.

[Nugget]

Maybe, going through my old logs and Cobb didn’t log fuel pressure and JB4 logs just had a number (generally 10-12) that has no scale.
This was back in 2014 with a Vargas stage 2 turbo on various ethanol mixtures.

[kern417]

Originally Posted by rednose

I would be 99% sure that dyno is reading in gas scale, which converts to .87 lambda.

I know ethanol is a very forgiving fuel but I was just giving an opinion.

If that tune was to be fattened up to say .78 or even .8 lambda I would almost be certain that it would make more power and be safer aswell.

Would be interested to see what the OP thinks.

I am looking at purchasing a M140i and I will probably be doing the exact same mods.

OP has spent his money in all the right places.

Nah every direct injection engine I've ran/tuned had a sweet spot at 0.86-0.88 lambda. Fuel type won't matter because you're injecting straight into the cylinder at high pressure so it burns more efficiently. It's only necessary on port fuel injection with some is lost in the intake path.

And as stated previously, the OEM tune runs 14AFR. I confirmed this on my dyno run a few weeks ago. So this is way better than stock, at least.

The only thing i personally don't like is how long we stay above 14 after we're already in boost. Typically BM3 tunes don't drop below 14afr until after you're in boost for 1000rpm. But just personal preference, the main thing is running lower in the top end where most of the heat is generated.

[rednose]

Originally Posted by Nugget

Is that with direct injection engines?
I am comfortable with it and obviously BM3 is comfortable enough to release it for use on thousands of cars.
The stock tune is around 14:1 to redline.



In my past experience trying to custom tune a N55 it hated anything much richer than 13:1

I didn't know that they were running them that lean in standard form.

Do you mind me asking how much the dump pipe cost you with shipping?

[Nugget]

£615.17

[rednose]

Did it fit up without too much fuss?

[Nugget]

Bolted straight in.