[Lus8aPilot]

First off, I want to say the Bootmod3 tune is pretty much awesome, especially the data logging function.

http://www.bootmod3.net/log?id=5b3e71d6d10b435a85a551c8

2018 M2 with 91-octane OTS map, Catless DP. Outside temp 82deg.

First time playing with a couple of data logs and I had a couple questions.

1- I see my IAT going from 113deg to 125deg on the 3rd gear pull. My ignition timing goes from 12 down to 4 then back up to 8. Are those timing values normal or being adversely impacted by high IAT?

2- We have 92 octane here in Washington State. Should I run the 91 OTS map or the 93 OTS map and let the computer figure it out?

3- If I play with more aggressive OTS tunes, what datalog parameters should I watch closely besides ignition timing and HPFP crashes?

Thx!

[Rondavouz]

3. The “aggressive” OTS map only has more aggressive burbles and nothing to do with the map being more aggressive towards engine tuning.

[Lus8aPilot]

Originally Posted by Rondavouz

3. The “aggressive” OTS map only has more aggressive burbles and nothing to do with the map being more aggressive towards engine tuning.

I should have said 'higher stage' map instead of more aggressive, going from Stg1 to Stg2 and figure out which FMIC to get.

Ended up setting the burbles back to OEM on the settings, with the catless downpipe they were a little much with the default OTS settings.

[horsepower_and_hounds]

Timing always drops in the beginning of the pull as boost comes up but it climbs consistently and you don't have any pull or knock registered. I would not run a map asking for more octane then you have at the pump without additive. Run the 91 map

Even with 93 I have pull now and then due to fuel quality running on the 93 map. As for IAT's if you don't have an upgraded IC your its will shoot out of control when you really work the car. 3rd gear pull barely works the motor.....you need to do a 4th or 5th

2k-7k in 4th will give you a better picture....I do 5ths when I can to test the limits of everything

[Lus8aPilot]

Originally Posted by m2ruder

Timing always drops in the beginning of the pull as boost comes up but it climbs consistently and you don't have any pull or knock registered. I would not run a map asking for more octane then you have at the pump without additive. Run the 91 map

Even with 93 I have pull now and then due to fuel quality running on the 93 map. As for IAT's if you don't have an upgraded IC your its will shoot out of control when you really work the car. 3rd gear pull barely works the motor.....you need to do a 4th or 5th

2k-7k in 4th will give you a better picture....I do 5ths when I can to test the limits of everything

Perfect. I have a track day on Friday so I'll have room on the front straight to log some pulls to the top of 5th gear.

[Lus8aPilot]

Track day was a ton of fun with the M2! I grabbed a couple of full-lap data logs at Pacific Raceways.

It was a warm day, about 88F in the afternoon. Power felt great, definite improvement from stock with just the DP and Stg1 91 OTS map.

I notice that IATs climbed up there, saw some 140-150F so even with just stg-1 I probably need a better FMIC for the track. Only a few detected knocks.

Morning Lap: http://www.bootmod3.net/log?id=5b48ceb1d10b4304ffb14eeb

Afternoon Lap: http://www.bootmod3.net/log?id=5b491974d10b4304ffb14fac

[BMWcurious]

In your first post, I noticed that at 15.x PSI at 5500 RPM you have about 7 degrees timing and no differences between cylinders, AFR in the 12s. I'd say that was nice.

In your afternoon lap you had a similar situation but cylinder #3 actually had negative timing.

How useful do you think "knock detected" is here?

As well as logging ignition correction per cylinder to stop guessing, your engine seriously needs an intercooler, more octane, a serious look at the datalogs and a custom tune.

[MTWO]

Your FMIC is hurting it even at this boost level but I’m surprised how awesome the logs still look even with your crazy IATs! I’d get some good FMIC and see how it does next time out.

[BMWcurious]

What are you using to judge whether the engine/tune is handling the high IATs?

[Lus8aPilot]

Originally Posted by BMWcurious

In your first post, I noticed that at 15.x PSI at 5500 RPM you have about 7 degrees timing and no differences between cylinders, AFR in the 12s. I'd say that was nice.

In your afternoon lap you had a similar situation but cylinder #3 actually had negative timing.

How useful do you think "knock detected" is here?

As well as logging ignition correction per cylinder to stop guessing, your engine seriously needs an intercooler, more octane, a serious look at the datalogs and a custom tune.

Yep, that first post was a quick pull on the freeway.

The track session, ambient temp was much higher and I was flogging it. Just confirming what has been posted here many times, the stock FMIC is not up to the job for track, even with the mild OTS Stg1-91 tune.

I'd be surprised if octane was the issue, was running with 92 octane Shell V and the tune was calling for 91.

[BMWcurious]

I would liked to have seen the DME pulling back the boost with these high levels of knock and IAT.

[MTWO]

Originally Posted by BMWcurious

What are you using to judge whether the engine/tune is handling the high IATs?

Stock FMIC is just so poor. Its crazy hot.

[BMWcurious]

I thought the afternoon track log looked awful because the IATs and knock were allowed to deteriorate by the DME calibration. If the calibration is designed for this spec (downpipe and stock IC), it could become safe with simple revisions to reduce load with high IATs and knock.

[Nezil]

Nice / Bad logs or otherwise, I want to commend the OP for actually gathering logs! In my opinion, logging is what sets apart the different tuning solutions out there, and the ability to log and then get feedback is really valuable. The OP obviously has the sense to get logs to check things are OK, though I probably would have done this before hitting the track to be safer.

Originally Posted by Lus8aPilot

Just confirming what has been posted here many times, the stock FMIC is not up to the job for track, even with the mild OTS Stg1-91 tune.

The stock FMIC is not even up to the job for street, even with the stock tune when the weather is hot; it's truly pathetic. The stock tune is more aggressive at reducing load when IATs rise, but everyone would probably benefit from upgrading it!

I'd be surprised if octane was the issue, was running with 92 octane Shell V and the tune was calling for 91.

I wouldn't. You're in a different state to me, but I find that I have to mix E85 with my pump 91, achieving an E20 blend, in order to get effective 91 AKI octane performance from my fuel.

Halim and Dzenan tell me that my 91 AKI pump gas is performing like 88 AKI on its own without the E85. I'm not saying that it's definite, but it's certainly possible that your summer pump 92 isn't giving you 92 performance.

Originally Posted by BMWcurious

I thought the afternoon track log looked awful because the IATs and knock were allowed to deteriorate by the DME calibration. If the calibration is designed for this spec (downpipe and stock IC), it could become safe with simple revisions to reduce load with high IATs and knock.

The BM3 OTS maps are known to be quite aggressive. They're fantastic for street use, but probably not ideal for track. I'd probably go back to stock or better yet, get a custom map for track use.

It is understandable... PTF have a product with competitors, and everyone is now pushing their OTS maps pretty hard to achieve dyno numbers and now more recently Dragy data. Most people know that you really need a map for street and a map for track. The majority of OTS maps are really designed for street rather than track, for those reasons.

[cookiesowns]

Send these logs to Dzenan Lus8aPilot They will fix her right up.

Seems a tiny bit aggressive for a non FMIC car. As BMWcurious mentioned.. the tune allowed boost to continue through without reducing taper/load at higher IAT's...

The newer OTS's I've seen ( not a whole lot ) resolves this issue by tapering load/boost down at higher IAT's for additional safety margin.

The rest of your logs look pretty good for OTS. That vpower 92 works great on the 91 map. M2 needs a FMIC period.

but fudge, these logs make me sad... confirmed I have a very slight boostleak now

[SeanWRT]

Originally Posted by cookiesowns

The newer OTS's I've seen ( not a whole lot ) resolves this issue by tapering load/boost down at higher IAT's for additional safety margin.

That's what I noticed when looking at m2ruder logs a few days ago. Technically boost was rather holding up flat than tapering. But it's abnormal to see boost target not reaching ceiling (a hint of taper), given the way load based system works and OTS targets have been set up since Nov 2017.

I was a little confused because m2ruder confirmed he's on latest OTS (V5.3) which I've logged many of and see no tapering to high IAT unless reaching boost ceiling. I even suggested he puts on more parameters (that is off by default) next time of log, so I can figure out why.

Now it seems like a quiet revision of OTS, without even updating version number. If that's true:

Load tapering to IAT is something they should've done from the beginning, in conjunction with a properly set up torque curve. Instead, they got them all out of way and came up with some ridiculous boost ceiling idea that works as a fail safe, fighting against all the load based mechanism. As a result DME is sort of boost based with OTS. There're also other byproducts - a way too aggressive map in winter, which many love, and a unsettled map in summer.

Now that they keep both strategies (tapering and ceiling) in place and still target as high as ceiling goes. Ideally, ceiling would be unnecessary should load to IAT be properly metered.

Tuners have different opinions and preferences. There's no absolute. Anyway it's fair to say BM3 OTS is as good as OTS gets.

[horsepower_and_hounds]

Originally Posted by SeanWRT

That's what I noticed when looking at m2ruder logs a few days ago. Technically boost was rather holding up flat than tapering. But it's abnormal to see boost target not reaching ceiling (a hint of taper), given the way load based system works and OTS targets have been set up since Nov 2017.

I was a little confused because m2ruder confirmed he's on latest OTS (V5.3) which I've logged many of and see no tapering to high IAT unless reaching boost ceiling. I even suggested he puts on more parameters (that is off by default) next time of log, so I can figure out why.

Now it seems like a quiet revision of OTS, without even updating version number. If that's true:

Load tapering to IAT is something they should've done from the beginning, in conjunction with a properly set up torque curve. Instead, they got them all out of way and came up with some ridiculous boost ceiling idea that works as a fail safe, fighting against all the load based mechanism. As a result DME is sort of boost based with OTS. There're also other byproducts - a way too aggressive map in winter, which many love, and a unsettled map in summer.

Now that they keep both strategies (tapering and ceiling) in place and still target as high as ceiling goes. Ideally, ceiling would be unnecessary should load to IAT be properly metered.

Tuners have different opinions and preferences. There's no absolute. Anyway it's fair to say BM3 OTS is as good as OTS gets.

Sent you new logs brother....these have TQ load turned on

But they are E30 right now till I burn thru it