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M2 Technical Topics > N55 Engine / Drivetrain / Exhaust / Bolt-ons / Tuning > N55-M2 OTS map version 5.8 is out for 93 and E30 octane

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      01-31-2020, 06:05 AM   #89
Daleb
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Quote:
Originally Posted by widetyres View Post
Yep, that's normal between the modes.

I too noticed additional lag with larger ic.

Imo the lag on stg2 91 is slightly less noticeable than stg2 93.

Search re gfb dv+ to reduce lag. That combined with the pure turbo inlet pipe is supposed to make a big difference. I haven't done these yet but plan too (shame they such a bitch to fit)
Pure inlet makes a nice difference. I added it to my m135i after having the usual bolt ons and noticed the improved throttle response, lag was negligible and the ability to run more boost up top over the oem inlet (jb4 tuning).

With my M2 I went from stock to all the bolt ons + the inlet straight away. Car felt more responsive over oem, no noticeable lag etc.

Also have a gfb dv+ but not sure itís needed on DCT m2.

My car runs solid on stage 2 93 with shell 99. With the e30 map I run shell 99 with a little ethanol to equal around e20, timing is clean with no corrections. However that is on the limit of my oem HPFP.

Next step would be to fit the original b58 HPFP I have for a small increase in volume and maybe see where the oem turbo can really do.
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      04-19-2020, 05:59 AM   #90
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Hello.

Did experience some missfires for the first time, first drive of the year. Did a pull on 2:nd a 3:rd gear, around 5000rpm on 3:rd gear i felt some missfire.

later that day i connected the app to do some logs, found a superknock code and some cylinder shutdown.

Anyway did some logs yesterday, cool ambient temp.

https://www.bootmod3.net/log?id=5e9b...729b04ce7336fc
https://www.bootmod3.net/log?id=5e9b...729b05541b79be

Maybe the fuel aged over the winter lost some octane ?. (it’s been in the garage for 5 months with a full tank of vpower 98 oct)

Fuelpressure drops, lambda spikes and knock detected are in the logs, but i’m not sure whats starting this chain of reactions in the logs.

Would be great if someone with more experience could give there thoughts on the matter.

Mods.
5.8 bm3 stage 2 93 oct.
downpipe,mpe
burger intake.
do88 Intercooler.
Vpower98 gas , should be atleast 93ron.
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      04-19-2020, 10:04 AM   #91
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Quote:
Originally Posted by Habbe77 View Post
Vpower98 gas , should be atleast 93ron.
The OTS 93 map is not for 93 Ron, itís for 93 AKI (RON + MON / 2) used in the US. Despite what is commonly thought, there is no easy way to convert between the two without knowing both values.

Most European logs show that your premium / super fuel is better than US 93 AKI, but perhaps not if itís degraded over 5 months...
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      04-19-2020, 12:13 PM   #92
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Quote:
Originally Posted by Nezil View Post
Quote:
Originally Posted by Habbe77 View Post
Vpower98 gas , should be atleast 93ron.
The OTS 93 map is not for 93 Ron, it’s for 93 AKI (RON + MON / 2) used in the US. Despite what is commonly thought, there is no easy way to convert between the two without knowing both values.

Most European logs show that your premium / super fuel is better than US 93 AKI, but perhaps not if it’s degraded over 5 months...
V power 99 is equivalent to 92.5 aki (the Mon is 86).

I reckon it would have gone off if left that long. Take a long easy cruise and use it all up and get some fresh fuel.

Also, imo the BM3 stg2 91 map is really good on vpower! Much more low down torque and only loses out on the last 200 rpm up high, compared to stg2 93.

Also, I get regularly get a maf reading of 43.4lbs/min on the 91 map. The most I've seen on the 93 map (same fuel) is 43.3. So the power between the two is virtually identical (given that 1lbs/min = ~10bhp), but the torque is on another level with the 91 map.
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      04-19-2020, 12:25 PM   #93
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I have to wonder about gas quality going forward. I recall OPEC+ not wanting to cut production, and USA and other countries saying they're filled up in fuel storage. There was a deal recently where all but Mexico cut production (mexico did but at a smaller amount than everyone else). They don't want to cut production because puts people out of work and less income for the businesses. None of that is important for this convo... I'm just wondering if gas will go bad being in storage. It's something to keep an eye on, with logs and all that, and possibly run a lesser tune until things are better.

I'm reading gas will last around 6 months in storage before losing combustibility. So it's be worth keeping an eye on how many cars are on the road and the fuel company news, as well. To see if storage gas is being used, new gas is being purchased, the state of the storage tanks, etc.
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      04-19-2020, 04:32 PM   #94
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Quote:
Originally Posted by widetyres View Post
V power 99 is equivalent to 92.5 aki (the Mon is 86).
Great that you were able to get the MON value for V Power in the UK. Sadly that doesnít mean that itís the same in Sweden. In the US, itís really hard to find the MON and RON values, but I read a document talking about how a US nationwide move to 95 RON was being proposed at one point, and the motion failed because several states, including California, wouldnít be able to produce 95 RON at the same time as the other environmental restrictions already in place.

Apparently, the most important factor for forced induction and high compression engines, is sensitivity, which is equal to RON - MON. Your V Power quote was 13, which is really really good.

If we assume that CA fuel, which is struggling to achieve 95, so letís say 94 RON, it would have a sensitivity of 6 (RON 94, MON 88) to achieve its pump rating of 91 AKI. This is the reason why CA and US fuel in general sucks, itís not only the RON or MON but the sensitivity as well. The best fuel is one with a high RON and high sensitivity apparently.
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