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      11-26-2021, 01:55 PM   #1
mws
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Any of you measure your M760i 0-60 times?

I have a 2018 with fun-flats (a few pounds heavier than non-RFs) and with my dragy, on 91 octane CA. gas, I can only get 3.92 to 4.0 second launch control 0-60s.

Automatic shift mode
Shifter lever in Sport
mode button in Sport.
press the DTC button.
brakes on
press gas to floor
see checkered flag. "launch control active" (you will see none of this if you do it wrong)
release brake as gas remains floored.
Shifting is harder than usual.



my question is this.

is it possible that my M760i has this issue as well?

https://apple.news/AZViY_GicSey1Bg0z9rwmtw

This is what motor trend tested back in 2017

"Considering the 5,036-pound curb weight, hitting 60 mph in a Motor Trend-tested 3.4 seconds and the quarter mile in 11.7 seconds at 120.1 mph is a feat that any automaker would be proud of."

https://www.motortrend.com/reviews/2...st-review/amp/
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      11-27-2021, 01:52 AM   #2
Atavus
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I’d presumed it’s what first gear is there for. The car doesn’t seem to use it in my experience. I only engage it for very slow moving traffic.

Haven’t read the Apple news link.
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      11-27-2021, 08:00 AM   #3
mws
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Quote:
Originally Posted by Atavus View Post
I’d presumed it’s what first gear is there for. The car doesn’t seem to use it in my experience. I only engage it for very slow moving traffic.

Haven’t read the Apple news link.
you should check the article. Motor Trend found an ECU glitch in the 550i that hindered only the launch. Once it was found and fixed by BMW, it got a good bit quicker.

right, 1st Gear is ignored during proper Launch Control. (plenty of torque, and shifts take time--so, avoid shifts). I also find that in (automatic) Sport mode, 8th is largely ignored as well, cruising the highway at 80mph, I have yet to see it settle into 8th gear. Thus making it a 6-speed car in Sport mode, virtually.

I was surprised to see the lack of drag info online. One video from Europe showing this



0-100kph in 3.91 which is a bit better than my 0-60mph.

And he is getting visible wheel spin, which is a waste of time. He could possibly be even quicker on launch. His tires are likely over-inflated. I know from experience with Dragy. Being overinflated by 8-10 psi can literally lose you 1.4 seconds on launch!

well if anyone has non-run-flats and can drag their launch, I would love to see the results, please.
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      11-27-2021, 09:41 AM   #4
Atavus
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The Dutch guys might have the pressure up for the high speed runs they do on the autobahn.
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      11-27-2021, 03:53 PM   #5
golobulus5
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I know with my 740 its actually faster if you don't use launch control. Also motor trend probably used 93 oct so might be a touch faster. Go out during one of these super cold nights. We can get -DA pretty easy here. I don't think anything is wrong with your car. Also dump the run flats.
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      11-27-2021, 04:49 PM   #6
mws
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Quote:
Originally Posted by Atavus View Post
The Dutch guys might have the pressure up for the high speed runs they do on the autobahn.
interesting. had not thot of that....
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      11-27-2021, 04:57 PM   #7
mws
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Quote:
Originally Posted by golobulus5 View Post
I know with my 740 its actually faster if you don't use launch control. Also motor trend probably used 93 oct so might be a touch faster. Go out during one of these super cold nights. We can get -DA pretty easy here. I don't think anything is wrong with your car. Also dump the run flats.
right, in California, we are stuck with 91. I have 100 octane race gas that is catalytic-converter-compatible in the next town over. I could mix in a bit and see if it helps.

First run shown is with stock wheels and run flats. Agree with you. Dumping run flats as we speak (as in--I am driving to get my new tires on my new rims in a minute)

... and some NES forged wheels. need to weigh them with the final new Pirelli P Zeros, but with the Michelin Ps4s I tried, and my forged wheels, I had lost a whopping 11 lbs front each corner and 13.5 lbs rear each corner. This is weighing using an accurate hanging scale.

The lighter tires and wheels spun like mad on launch (for 1.4 seconds) until I aired them down from the shop's 45 psi or so, to around 36 psi., then still-- the G curve did not look great and my launch was no faster than 4 seconds. I am hoping the P Zeros will be stickier.

Still hoping someone else has a dragy and an M760i we can compare to. I know there are plenty of other BMW car/engine combos that are quick. Just bemoaning the lack of M760i data.
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      11-28-2021, 01:21 PM   #8
mws
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" know with my 740 its actually faster if you don't use launch control."

WTF? you are right....in sport mode, I tried just braking and pressing the gas a bit and releasing, just as an experiment, (a technique which kicked my pals
tail over and over at the BMW track day drag competition) and lost 3/10ths of a second over my launch control times. That is flat-out wrong. There's something going on with launch control on my car, at least.

might try some higher octane gas, soon. Wish I had a safe place to test 60-130mph around here, I also wish Dragy had a more attainable option like 60-100 or something. For acceleration comparison.
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      11-29-2021, 01:03 PM   #9
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Glad to hear the no launch control worked for you. Some people add a little bit of e85 to get that higher octane. Just a couple gallons. To get my 60-130 I use back country roads. I find that my fastest 60-130s are if I just do a 1/4 mile and pushing it out to a little over 130mph. You could also do it super late at night on a empty freeway. Finding a good road to go 130+ isn't always easy. Any plans to tune your m760?
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      11-30-2021, 08:55 PM   #10
mws
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Quote:
Originally Posted by golobulus5 View Post
Any plans to tune your m760?
perhaps once it is out of warranty early next summer. yeah.

any good tuner recommendations? Also, does this car cook cats when tuned? (I guess I could ask the tuners)

I also was bummed to find there are zero aftermarket exhaust solutions for the car.
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      11-30-2021, 08:56 PM   #11
mws
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[QUOTE=golobulus5;28306488] To get my 60-130 I use back country roads. I find that my fastest 60-130s are if I just do a 1/4 mile and pushing it out to a little over 130mph. /QUOTE]

...are you saying you have a Dragy, or some other performance measuring device?
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      12-02-2021, 01:06 PM   #12
golobulus5
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Yeah I use a dragy. I can't really recommend a tuner for you because I noticed as you have that there isn't much aftermarket support for your car. However I do know tunes exist. As you have said, finding any data on the m760 is hard. On dragy there is a guy in moscow who went 10.7@130 with a tune, downpipes and 100oct.

Its really a shame because I think these v12's have potential. But if you look at it from a tuner/parts manufacturer pov those engines came in one car the m760 so I think a lot of the tuners pass them up.
The 740 is hard to find info on too. Luckily for me almost everything that fits on a 340 or 540 fits on the 740. And the 340's only started getting real attention from tuners because of the supra.
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      12-06-2021, 08:40 AM   #13
mws
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That is great you have a larger pool to choose from. The N74 variant is also on the Rolls Royce, but... not exactly the same beast.

So, on tuners, these days I find them all to be lame when it comes to providing performance data. When I was tuning Nissan 300ZXs for a living, you NEVER bought anything from Anyone (tune, intake or exhaust, and more) unless they showed you a dyno sheet.

Nowadays, we have Dragy and others, it is easier than ever, and these lame dips don't provide a lick of proof of any performance gains. Not sure how they expect to stay in business. That is the way it is for the i8 and the M760i, at least. In the Jag world, most do provide charts.
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