08-13-2016, 12:07 PM | #1 |
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Launch Control
Has anyone really drag raced your i8 and if so, did you engage launch control?
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08-24-2016, 03:32 PM | #2 |
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I tried to. Seemed simple enough from the owners manual but it wouldn't engage on my car. Perhaps because I only had 300 miles on the odometer. Owner manual says something about 1,200 miles...maybe the feature is unlocked after achieving a certain number of miles.
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08-24-2016, 10:17 PM | #3 |
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Yes. Against a tuned ATS-V. Results with LC and without were night and day. With LC it's an easy win for the i8 without it's an ass whooping by the V.
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08-25-2016, 08:53 AM | #4 |
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Do we have an accurate 0-60 measurement? I'm seeing times (by magazines) which are all over the map. Seen them as low as 3.6 and as high as 4.4
Should we just split the difference and say 4-flat? |
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08-25-2016, 09:21 AM | #5 |
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I think performance depends on a state of battery charge, as an example last night doing eco-pro 50mph and trying to make a fast line change ... switching to sport with kick down and battery at zero and car pulling like its only about 250hp and may be only using gas engine at this moment
you can install app, BMW M Laptimer, connect your iPhone thru USB cable and measure your 0-60
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08-25-2016, 09:34 AM | #6 | |
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08-25-2016, 09:54 AM | #7 | |
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Also as we all know turbo optimal condition: sea level and outside temp should be in 55-65 F range for max output too many variables in this car and all should play together to get best 0-60 time for me it always feels like something wrong with my car and that it doesn't pool enough for the specs and online reports, my X6 50 always feels like faster than i8
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08-25-2016, 01:19 PM | #8 |
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I don't think state of charge makes that much of a difference. All you need is sufficient charge for a few seconds of boost. And the little segments at the top of the tach / energy meter gauge show you how much boost you've got. That can be full even if your battery is far from full. There's only so much that the e motor can consume in any moment in time. A gas engine doesn't run stronger with a full tanke either, after all (actually slower due to weight).
I think the different times are more likely down to testing conditions, and whether LC was used or not. |
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08-25-2016, 01:28 PM | #9 | |
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I wonder if your performance problem had more to do with trying to do engine on, engage sport, and kick-down all at once and out of the blue. Maybe engine management kicked in and reduced power to prevent too much strain hitting a cold engine. |
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08-25-2016, 02:13 PM | #10 | |
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08-25-2016, 02:47 PM | #11 | |
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based on recent Tesla announcement that all old P90 cars will be able to switch to a new battery from P100 and get a better performance based on a battery only , I would suspect more battery = more potential power for electric motor ... and yes according to basic physics its not true , but together with complicated computer/charging interplay its adds up to the speed of electric motor spin.
BMW limits battery drain and stop it from draining at about +/-20-30% * we have 7.1kwh battery but in reality we only have 5+kwh ) and at this point you cant drain anything towards kick-down unless you charge it again above 20-30% at least +5-10% Quote:
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08-26-2016, 12:50 AM | #12 | |
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The difference between the 7.1 and the 5.2 is exactly that discharge safety marging that is supposed to ensure a longer battery life. The 5.2 is what's indicated on your battery meter and when charging, and it's fully usable. You can see that, for instance, when you do the math on distance driven and e consumption indicated by the trip computer. I have never seen my car drop power when under 20 or 30% charge of the battery. That would be silly - especially since you can drive that charge right down to nothing in all e mode. |
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08-26-2016, 04:25 PM | #14 |
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Does that mean the electric motor is not used at all if the boost ring is not lit up? I was under the impression (from my sales guy) that it's never gas only...either full hybrid at all times or electric only in e-drive.
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08-27-2016, 01:59 PM | #15 |
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According to my power meter readings, there's a little pull from the e-motor on high-speed cruise - around 2 or 3 kWh per 100 km. But whenever you ask the car to accelerate, the front wheels kick in with force.
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08-28-2016, 01:39 PM | #16 |
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Just did 2 runs
5.3 with usual day to day condition - full gas tank and almost full charge , me and my 5yo son with air conditioning on - no lunch control 4.8 no AC and LC on - I will try more but this is not a very good numbers I will do similar runs with my x6 and I bet I will get a better numbers.
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08-28-2016, 03:14 PM | #17 |
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One more LC run after 45 min rest stop about 75% charge no AC
This time on a spec 4.4 - but far from expected
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08-28-2016, 04:04 PM | #18 |
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I think state of charge makes a huge difference. Just open the eDrive settings where the battery charge is shown as a %, put your foot down and go for the limiter, you'll see what I mean. The battery percentage drops alarmingly fast at a rate of about 0.5% per second in my experience. So my guess is if you start your pull with a low enough charge, you'll run out of juice mid-run and the car will be slower than if you had started with more juice.
P.S. Not condoning anything illegal, so try this at your own risk and hopefully on a private road or at a track.
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08-28-2016, 05:46 PM | #19 | |
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Or did you mean 5% per sec? In which case, a 25% charge would still be enough. But I've never stepped on it for 5 secs and suddenly lost 25% of my range as a result. |
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08-28-2016, 05:54 PM | #20 | ||
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08-28-2016, 08:11 PM | #21 | |
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08-29-2016, 01:13 AM | #22 | |
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Of course, state of charge makes a difference if you run out of juice in the middle of your acceleration. My point was: if you're stepping on it for a quick lane change, the amount of power you get is not dependent on whether the battery has 10% or 30% or 90% charge at that point. You'll get what the e motor is capable of, not less. |
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