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01-14-2013, 08:29 AM | #1 |
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tunes and type of fuel
for all the tuners, when the car is tuned to run on 94 octant does the 10% ethanol affect anything in the code ? or it doesn't really make a big difference?
and what are the main differences between the 94 tune and the 91?
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01-14-2013, 10:27 AM | #2 |
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The M3 DME is an adaptive control system tuned or stock. It will always self adapt to the fuel being used in the vehicle. This includes the octane rating and quality of the fuel due to additives such as ethanol. You can vary the fuel used and the DME will adapt in an attempt to make as much power as it can while keeping the motor safe. This is why you see cars that run race gas typically gain power on the dyno without any changes to the tune.
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01-14-2013, 05:44 PM | #3 |
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+1 to what Roman said..
To elaborate however - the car is not going to advance timing past it's targeted limits at full throttle. So higher octane is most beneficial in extreme conditions (i.e, hot temperatures, high humidity, high altitude). In cold temperatures at sea level the car will hit its targets and higher octane won't do much, if anything. Then if you get a tune suited for the higher octane the car will pick up a lot of power. There are also maps in the ECU which control the amount of timing pull that is allowed, etc.. In fact, there are tons of maps that are ignition related, it's basically one whole side of the DME. |
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01-14-2013, 06:02 PM | #4 | |
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01-14-2013, 06:04 PM | #5 |
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Drives: BPMsport 2012 E92 M3
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01-14-2013, 07:08 PM | #6 |
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You cannot exceed optimal ignition however. No matter what fuel is used.
The ignition targets set by the factory are quite radical to start with for a production car and this is really down to the excellent knock detection system. The type of fuel is not just restricted to ignition timing.... |
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01-14-2013, 07:14 PM | #7 |
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Bro ..... Roman said it best, it's all target based and will self adapt to the set minimum/maximum perimeters, SAFELY.
That's all you need to know but just incase you want to know more The TECH & BENVO are always eager to explain more in Depth |
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01-14-2013, 07:39 PM | #8 | ||
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If you set targets that are too high, and you are outside of the DME's programmed adaptable range of retard, then the car will run that timing even though it's knocking. Is a knocking engine safe? No. There are also 'minimum timing' maps which signify the minimum timing that can be run. But thanks for chiming in. Edit: Comment about PG removed. Quote:
Last edited by BPMSport; 01-15-2013 at 04:45 PM.. |
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01-14-2013, 07:43 PM | #9 | |
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01-14-2013, 07:48 PM | #10 | |
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Some customers request a higher octane tune for when race gas is used. |
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01-14-2013, 08:03 PM | #11 | |||
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What I was saying was rather clear until you put on you superhero tuner outfit on and twisted it When you set parameters you set them within safe range/margin .... Go ahead have fun twisting this again and show everybody what the new kid on the block can do |
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01-14-2013, 08:08 PM | #12 | |
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Oh sorry, I'm acting like you. Shame on me. Excuse Sal and I for sharing pertinent information. Thanks |
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01-14-2013, 08:18 PM | #13 | ||
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I stand corrected "PARAMETERS" ... Silly me |
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01-14-2013, 08:21 PM | #14 | |
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Assuming targets are being reached on 91 and optimal conditions to run higher advance. Will your tune have the range to take advantage of 100 octane race fuel. It sounds what you are saying is that it would require a 100 tune that I could not run 91 on. Can you please elaborate? Not sure if you had flashloader capabilities that could switch between maps on the fly. |
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01-14-2013, 08:33 PM | #15 | |
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We ask what octane you run for a reason. If you want to run 100 octane, you can flash in a file suited for that in 5 minutes. Running 91 octane on a file suited for 100 is not a good idea. Running 100 octane on a file programmed for 91 is not going to take full advantage of the 100. I hope this answers your question. |
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01-14-2013, 08:47 PM | #16 | |
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so the missing link for me, would be the ability to run both maps and switch on the fly. Is that something you guys have done? |
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01-14-2013, 09:34 PM | #17 | |
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01-14-2013, 09:41 PM | #18 |
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If you mean to switch maps on the fly... Aka Vishnu , that is something outside of the stock DME, best the stock DME can do a upload of a new file with the car off. If you want the ability you need a piggy back, or Stand alone.
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01-14-2013, 09:59 PM | #19 | |
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01-14-2013, 10:16 PM | #20 | |
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My 7 series does it but it uses a standalone ECU. Thanks for the offer. To be honest I really don't care. I texted him about it awhile back and never got a response. It doesn't matter to me so lets take it to PM or let it be. |
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01-14-2013, 10:19 PM | #21 | |
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It's a challenge to not bounce off the rev limiter. The nice thing is that doing so is not brutal, just annoying.
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01-14-2013, 11:47 PM | #22 |
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Seems to not be prevalent anymore, but there used to be flashloader units that had far less functionality vs the new laptop driven software but you could switch between up to 10 different tunes. Did this with ESS and although more arcane vs using new laptop software, extremely convenient to reflash tunes (takes about 10-15 mins to do this), especially on the go (can keep in your glovebox).
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