03-20-2019, 08:27 AM | #89 | |
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03-20-2019, 08:35 AM | #90 | ||
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Trying to make some decisions based upon these data points for my own 18 LCI FBO running the 93. Why would I continue running a more aggressive map that doesn't make as much power as opposed to using the 91 map? |
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Dabozo635.00 |
03-20-2019, 10:40 AM | #91 |
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Guys it's important to note the limitations of your local fuel. The octane rating might not be very accurate depending on where you are which is why it is important to log your runs with each map.
"Stages" are a useless arbitrary term and in reality basically just refers to how much boost the map targets. For example: even though you might have access to 93 oct gas in your area, it might not truly be 93 oct and therefore your car might respond better to the 91oct maps regardless of either stage 1 or stage 2. And even then perhaps Mods play a part in your POTENTIAL to run higher boost (aka higher stages) but fuel is the ultimate limiting factor Disclaimer: I am no expert but I like to read and gather as much information as I can to make informed decisions. |
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03-20-2019, 10:43 AM | #92 | |
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nioh_lbbm21716.50 Dabozo635.00 |
03-20-2019, 11:07 AM | #93 | ||
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03-20-2019, 11:18 AM | #94 | |
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All that said in Texas, the posted octane is what you will get as a general rule of thumb. The detergent levels are a major difference where Shell has routinely tested the highest levels in their 93. I do wonder if the map is possibly too aggressive relying on something slightly more than 93 since its an art not science. In other words, how does Halim make adjustments right up to 93 without causing a knock without extensive testing with exactly 93 octane fuel. If you are worried about knock damage(if that can happen in the n55), then it seems prudent to go with the 91 map or maybe the last release of the 93 that wasn't as aggressive. Question for Halim - how do you know if your map has gone over the 93 threshold? Does it matter? |
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03-20-2019, 11:26 AM | #95 | ||
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So possible variances between RON and MON value can still come to a "valid" AKI number but can affect your timings. Halim is in Denmark I believe so their fuel is RON There is good 93 AKI fuel in the USA but since it varies so much from location to location taking logs to confirm your findings is the best thing to do |
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03-20-2019, 11:32 AM | #96 |
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I believe the car used to develop V5.6 may have been using 99 RON gasoline, which translates to 94-95 octane. Halim please correct if that’s incorrect.
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03-20-2019, 11:58 AM | #98 | |||
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-how does Halim target a specific octane? Is it science? is it know how with testing? Or asked another way, how precisely does the 93 map target 93 AKI fuel? Naturally there is a second question -Does using an overly aggressive map for the fueled octane cause any damage? The answer to these plus somebody's confidence in their fuel will tell them how to make decisions utilizing the various maps. I have tested a couple times on the 5.5 map and I found one knock on one pull, and no knocks on others. I would have to do a lot of testing on stock, 91 map, and 93 maps to get enough data points to start making some kind of an assessment. It would be interesting to see if the stock gets knocks on 91. That would tell me BMW doesn't care if the knock sensors go off because they have systems to deal with it and thus they are not concerned about damage. |
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03-20-2019, 12:38 PM | #99 | |
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Octane affects timing, the higher the octane the higher ignition is possible resulting in higher power. We do not push the OTS maps to max, there is always a little room, why? I've seen that the 93OCT can be good, but then you could have the perfect 93OCT but a very hot weather. There are too many variables that come into play, that's why we do NOT push the OTS maps to maximum. It's done in a way so it suits the majority of the cars, regardless if the octane is 92.7 or 93.x, hot or cold weather. Basically like OEM, just more power. |
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nioh_lbbm21716.50 |
03-20-2019, 03:55 PM | #101 |
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OTS maps are called "off the shelf" for a reason. They are designed to work with all cars without the tune needing to be modified. This is why halim doesn't push these OTS maps to the max. If you want a tune tailored specifically for your car in your environment with your gas to get maximum power, get a custom tune at a local shop.
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03-20-2019, 03:57 PM | #102 |
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03-20-2019, 04:03 PM | #103 | |
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03-20-2019, 04:44 PM | #104 | ||
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03-20-2019, 04:45 PM | #105 |
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03-20-2019, 04:48 PM | #106 |
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03-20-2019, 05:28 PM | #107 | ||||
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03-20-2019, 10:01 PM | #110 | |
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From new logs, I don't really think US 93OCT is able to handle V5.7 on hot days. I even doubt Dinan turbo be enough to do it. Guys here must be much more excited than worried to hear that and cannot wait to try V5.7. Human nature. Though I'm sure in Europe with better gas and cooler temp, V5.7 works very well. To my standard, with western USA pump gas, V5.7 is over aggressive that it be best run with the STG2 turbo (bigger turbine and low manifold back pressure) which requires less octane for any given boost. N55 is and has always been more of the little octane game, than anything else.
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