[BostonM235xi]

BM3 Stage 2 Data Log from 60-110 mph, took 3 screen shots numbers look good AFR, Boost, IAT... Any input would be great or other Data logs.

[Taskmaster]

15PSI at 6500rpm? Nice.

[BostonM235xi]

Originally Posted by Taskmaster

15PSI at 6500rpm? Nice.

Thanks bro, I know it's not very common to keep Boost all the way thru rpm.
Not sure how familiar you are at looking at Data logs if everything looks good?

[Taskmaster]

Originally Posted by BostonM235xi

Thanks bro, I know it's not very common to keep Boost all the way thru rpm.
Not sure how familiar you are at looking at Data logs if everything looks good?

I’m learning, but I don’t see anything that stands out. I also don’t know what all the BM3 targets should be.

[Bee Pee]

Originally Posted by Taskmaster

15PSI at 6500rpm? Nice.

That's the target psi and actual psi is consistently about 1psi lower on all 3 screenshots...

[Taskmaster]

Originally Posted by Bee Pee

That's the target psi and actual psi is consistently about 1psi lower on all 3 screenshots...

I noticed that - is that considered normal? What about the timing?
What does the BM3 maps actually call for?

[Bee Pee]

Originally Posted by Taskmaster

I noticed that - is that considered normal? What about the timing?
What does the BM3 maps actually call for?

It's not normal - target is too high IMHO

Timing - should be numerically the same with a variance <3 so this is borderline OK.

Just by glancing at these I'd say fuel quality could be better

[Bee Pee]

Originally Posted by BostonM235xi

BM3 targets 15.77 on N55 Engines for stage 2.

BM3 boost targets are dependent on several factors - n55 M2 BM3 stage 2 will target higher psi than high 15's you quote.

https://f87.bimmerpost.com/forums/sh....php?t=1497548

The thread above shows how better fuel and or higher octane helps keep BM3 OTS map actuals v target parameters together more of the time with more consistency

[Bee Pee]

Originally Posted by BostonM235xi

Your the man Bee. I'll try octane booster and see what the Log looks like.

Buy ethanol its cheaper [and kinder to yr N55] than most OB's. IIRC M2 n55 can run upto e20 wo issues.

Suggest start by trying say 1 gal of ethanol to a full tank and logging; then repeat by adding 0.5gal at a time, topping up with regular gas and logging to see what changes.

I wouldn't go beyond ~ 2.5-2.75 gal of ethanol to a full tank of gas.

[Taskmaster]

Where do you typically fill up OP? Have you tried a top tier gas station?

[BostonM235xi]

I use Shell 93, I would love to do a e85 tune but there are only 3 e85 stations in Boston.

[SeanWRT]

OP,

With proper 93OCT and 60~70F of IAT in your case, the timing across should be maxed out any time all the time.

Do a few more pulls to see how it adapts. Preferably pull back to back to let IAT climb so you see how it respond to higher temp.

I'll look if you send me the link to full log.

[BostonM235xi]

Originally Posted by SeanWRT

OP,

With proper 93OCT and 60~70F of IAT in your case, the timing across should be maxed out any time all the time.

Do a few more pulls to see how it adapts. Preferably pull back to back to let IAT climb so you see how it respond to higher temp.

I'll look if you send me the link to full log.

SeanWRT - here are 2 new sets of data logs. 3 snap shot of 2 runs beginning, middle and end of the Log.

[BostonM235xi]

http://www.bootmod3.net/log?id=5c1c3185c090c6456171cdea

[Bee Pee]

Originally Posted by BostonM235xi

http://www.bootmod3.net/log?id=5c1c3185c090c6456171cdea

4th gear log from ~5k upwards is pretty meaningless TBH as datalogs over ~2000rpm rev range.

Suggest you do multiple pulls in a single gear [min. 3rd gear] with DSC fully off and with WOT (gas pedal at 100%) from below 2000rpm to redline and you will get more data points across a larger (ie ~5000 rpm) rev range.

staying in 3rd gear, decelerate then repeat again a few more times in 3rd gear so as you can see how logs hold up as IAT's climb.

You can continue to log into 4th [& 5th] as you move up thru the gears with pedal at 100% WOT.