[Nezil]

A few weeks ago I bought a dragy, mostly out of interest, but also to compare the performance I was getting from my tune compared to others. Dyno is interesting, but dragy data also has its place.

I'm on vacation in England at the moment, and brought the dragy with me. Last night I went out with my brother in his Mazda MX-5, which is the 2 litre version with a manual box. He's not that bothered about numeric performance, and loves the MX-5 for driver involvement. I was quite impressed out how easily he drifted it round a small roundabout without spinning!

In any case, I encouraged him to do one 0-60 attempt with the dragy, and he reluctantly agreed. On this, his only and first attempt, he got a 7.02s time. Mazda quotes his car as 7.3, so he beat the manufacturer's time first try!

I have a 6MT M2, and BMW quotes this as 4.3 I believe, and several websites and magazines appear to have validated this. The question I have is how the hell was that achieved? The best I've gotten, even with a tune, is 5.12s. That's quite a bit better than my brother's 7.02 in his MX-5, but it's way longer than BMW claims it should be.

DCT launch is pretty easy with launch control, and there is no loss of boost on shifts, but am I missing something with 6MT that I should be doing? My car seems to bog down on launch because the turbo isn't spooled up, and comes off boost on 1st to 2nd changes. Should I be doing no lift shift from 1st to 2nd? Is there a technique I'm missing for launching our cars with 6MT? What dragy times have 6MT drivers actually achieved?

[ShelJW]

Originally Posted by Nezil

What dragy times have 6MT drivers actually achieved?

Dragy should show you times of other vehicles similar to yours, along with what mods were done to them.

Here's one of the few that I was able to find for an M2. It is strange that this owner seems to have done several mods (Dinan cat back, VF Engineering stage 1) and the best time he seems to have gotten is a 4.54s

[just blaze]

Originally Posted by ShelJW

Dragy should show you times of other vehicles similar to yours, along with what mods were done to them.

Here's one of the few that I was able to find for an M2. It is strange that this owner seems to have done several mods (Dinan cat back, VF Engineering stage 1) and the best time he seems to have gotten is a 4.54s

Pretty sure that is ///cbrash

[Nezil]

Doesn't show if he's 6MT or DCT. My 5.12 looks like this:



That 4.54 result has a much quicker shift than I was capable of, but that doesn't mean it is DCT, I might just be crap!

[akkando]

Originally Posted by Nezil

Doesn't show if he's 6MT or DCT. My 5.12 looks like this:


That 4.54 result has a much quicker shift than I was capable of, but that doesn't mean it is DCT, I might just be crap!

if it's cbrash he has DCT.

I think he mentioned in a youtube video that the tune made launching the car 0-60 not really any faster because of traction. He did a comparison with a stock M235i.

[Oxymoron]

It's just really hard to get a perfect launch in a 6mt M2. Such a fine line between wheel spin and bogging down.
I don't have a dragy, just a p3 vent gauge, but my 0-100 times actually got slower after my tune due to more wheel spin. If you launch in anything other than dsc fully off, you most likely won't get 100% throttle. But with dsc off you get wheel spin.
BMW probably got their figures in perfect conditions. I'm certain it could be matched, you just need a very grippy start line.

[horsepower_and_hounds]

I just got my draggy and did a standing stop launch..... not sure if it was launch control. Did not see the flag like on the M4

1st try I had major burnout and a 0-60 time of 4.74, 1/8 8.36, 1/4 12.97, 1/2 30.99
Did another 0-60 run and a burnout followed with a little sideways action and did 4.83

I need to learn how to launch the car. Does launch control show up with a flag like on the F80/82?

[Nezil]

Originally Posted by Oxymoron

It's just really hard to get a perfect launch in a 6mt M2. Such a fine line between wheel spin and bogging down.
I don't have a dragy, just a p3 vent gauge, but my 0-100 times actually got slower after my tune due to more wheel spin. If you launch in anything other than dsc fully off, you most likely won't get 100% throttle. But with dsc off you get wheel spin.
BMW probably got their figures in perfect conditions. I'm certain it could be matched, you just need a very grippy start line.

I'm certain a DCT launched under perfect conditions can get a 4.1, although we're talking 0.6s needed for m2ruder below, assuming he's DCT, 5.2 seconds that I got is 0.9 off the pace for 6MT... that's a lot to make up!

I've not seen ANY videos or dragy logs of 6MT 0~60 anywhere close to 4.3 seconds.

Originally Posted by m2ruder

I just got my draggy and did a standing stop launch..... not sure if it was launch control. Did not see the flag like on the M4

1st try I had major burnout and a 0-60 time of 4.74, 1/8 8.36, 1/4 12.97, 1/2 30.99
Did another 0-60 run and a burnout followed with a little sideways action and did 4.83

I need to learn how to launch the car. Does launch control show up with a flag like on the F80/82?

You're DCT aren't you m2ruder?

[horsepower_and_hounds]

Originally Posted by Nezil

I'm certain a DCT launched under perfect conditions can get a 4.1, although we're talking 0.6s needed for m2ruder below, assuming he's DCT, 5.2 seconds that I got is 0.9 off the pace for 6MT... that's a lot to make up!

I've not seen ANY videos or dragy logs of 6MT 0~60 anywhere close to 4.3 seconds.

You're DCT aren't you m2ruder?

Yes am DCT. Pulls were at 5:30am, dark and 74deg

[3Si]

Are you guys launch from normal roads or are you launching from a drag strip? It makes a huge difference. With DCT launching at about 4k RPM, there really isn't much wheel spin on a clean strip. Normal road would be a burnout. I do not have an official slip as it was a private session.

But here's the video:

Also keep in mind that numbers from magazines measures a little differently.

[horsepower_and_hounds]

launches were on normal residential roads on way to work. Have no drag strip available

[kfscoll]

The best I’ve gotten with my bone stock manual M2 is 5.45s 0-60 (clocked using the M Performance Drive Analyzer app and OBDII dongle). I bogged like crazy on launch though and my 1-2 shift was slow so there’s definitely room for improvement.

[Oxymoron]

I managed 0-100 (0-62) in 4.72 in my 6mt while stock on a normal road. That was in sport +

And then 4.4x after stage 2 mods and tune. Haven't been able to repeat again though. Need new tires

[AESZ4]

you're worried about 0-60 times and you bought a manual RWD car?

[Nezil]

Originally Posted by Oxymoron

I managed 0-100 (0-62) in 4.72 in my 6mt while stock on a normal road. That was in sport +

And then 4.4x after stage 2 mods and tune. Haven't been able to repeat again though. Need new tires

Nice! That's closer than I've seen anyone get yet, besides the reviewers. Did you do anything unusual like no lift shift to second?

[Nezil]

Originally Posted by AESZ4

you're worried about 0-60 times and you bought a manual RWD car?

I wouldn't say worried, just curious about how BMW and journalists achieved the 4.3 seconds they claim.

I'd also like to learn a new skill if that's required to achieve the time they get.

[XutvJet]

Originally Posted by Nezil

A few weeks ago I bought a dragy, mostly out of interest, but also to compare the performance I was getting from my tune compared to others. Dyno is interesting, but dragy data also has its place.

I'm on vacation in England at the moment, and brought the dragy with me. Last night I went out with my brother in his Mazda MX-5, which is the 2 litre version with a manual box. He's not that bothered about numeric performance, and loves the MX-5 for driver involvement. I was quite impressed out how easily he drifted it round a small roundabout without spinning!

In any case, I encouraged him to do one 0-60 attempt with the dragy, and he reluctantly agreed. On this, his only and first attempt, he got a 7.02s time. Mazda quotes his car as 7.3, so he beat the manufacturer's time first try!

I have a 6MT M2, and BMW quotes this as 4.3 I believe, and several websites and magazines appear to have validated this. The question I have is how the hell was that achieved? The best I've gotten, even with a tune, is 5.12s. That's quite a bit better than my brother's 7.02 in his MX-5, but it's way longer than BMW claims it should be.

DCT launch is pretty easy with launch control, and there is no loss of boost on shifts, but am I missing something with 6MT that I should be doing? My car seems to bog down on launch because the turbo isn't spooled up, and comes off boost on 1st to 2nd changes. Should I be doing no lift shift from 1st to 2nd? Is there a technique I'm missing for launching our cars with 6MT? What dragy times have 6MT drivers actually achieved?

What's your launch technique and driving mode?

[3Si]

Originally Posted by Nezil

I wouldn't say worried, just curious about how BMW and journalists achieved the 4.3 seconds they claim.

I'd also like to learn a new skill if that's required to achieve the time they get.

Most publications in the US use one foot of rollout...meaning they don't start the stopwatch until the car has rolled 1 foot. As mentioned before, all the 0-60 tests were done on the track, it makes a huge difference when you don't have to worry about traction which is the number one cause for power loss in a RWD on public road. You simply just can't dump the clutch at 4k without wheel spin on regular roads. Most of them do power shift, but that one shift wouldn't make up for the almost full second difference. Last but not least, if you are using a phone app, it is simply not that accurate even if you calibrate it correctly.

[Nezil]

Originally Posted by XutvJet

What's your launch technique and driving mode?

Nothing special really. Something along the lines of:

Clutch in, hold revs at around 2,500
Clutch out reasonably fast, not much slip (of the clutch) and floor the accelerator as soon as it's fully out
Keep it floored to red-line in first
Regular gear change (off gas, clutch in, shift, clutch out, on gas) as quick as I can

[Nezil]

Originally Posted by 3Si

Most publications in the US use one foot of rollout...meaning they don't start the stopwatch until the car has rolled 1 foot.

Yes, I'm aware of the 1 foot rollout, and I think dragy is supposed to be adding that.

As mentioned before, all the 0-60 tests were done on the track, it makes a huge difference when you don't have to worry about traction which is the number one cause for power loss in a RWD on public road. You simply just can't dump the clutch at 4k without wheel spin on regular roads.

That's a great point that I'd not thought of.

Most of them do power shift, but that one shift wouldn't make up for the almost full second difference.

Yes, but every little helps of course. Is flat foot shifting something that's ill advised if you like your car? I guess if you're taking first to red-line anyway, the rev-limiter will hold it there as you shift even if you don't let off the gas. It probably feels odd to do that, and puts some additional load on the clutch when you let it out, but perhaps not as violent as you might think?

Last but not least, if you are using a phone app, it is simply not that accurate even if you calibrate it correctly.

I'm using a dragy, which I think has been shown to be within a few hundredths of the V-Box and a drag strip timing system, though granted, without the 1 foot rollout.

[carl44]

motor week got a 4.2 with a 16 MT..carl

[MR_M2]

Originally Posted by Nezil

Nothing special really. Something along the lines of:

Clutch in, hold revs at around 2,500
Clutch out reasonably fast, not much slip (of the clutch) and floor the accelerator as soon as it's fully out
Keep it floored to red-line in first
Regular gear change (off gas, clutch in, shift, clutch out, on gas) as quick as I can

Try with DSC off and dump the clutch.