BMW 1-Series Forum (F20) 135i - 1Addicts.com > Second Generation 1 Series Forum > 2012 BMW 1-Series Sporthatch (F20) Discussion > 0-62mph time of 125d...how?
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      04-10-2013, 03:42 AM   #45
mowflow
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I had another bash at this last night. I now have my standard 18" wheels with Pzero RFTs on.

First run ballsed it up yet again and got just over 7 seconds

Second attempt got everything pretty sweet, shifted aggressively chirping the tyres in every gear and got
6.2 seconds

Looks like it is possible to beat the manufacturers figures. To be honest I'm not sure i could knock anything off that figure and it does seem to take a lot of effort/luck (not talent as i don't have that) to get the time.

Here are my current best times for some other intervals:
40-60mph = 2.5s
60-80mph = 3.6s

Sadly I couldn't work the phone while driving to get a screen shot of the times so everyone will just have to take my word for it.... unless I do it again of course.
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      04-10-2013, 05:28 AM   #46
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I just bought a cheap OBD2-adapter off Amazon, and I'm anxious to see if I can beat the factory numbers in my 120d. It's fun with gizmos like these!
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      04-10-2013, 11:57 AM   #47
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Quote:
Originally Posted by mowflow View Post
I had another bash at this last night. I now have my standard 18" wheels with Pzero RFTs on.

First run ballsed it up yet again and got just over 7 seconds

Second attempt got everything pretty sweet, shifted aggressively chirping the tyres in every gear and got
6.2 seconds

Looks like it is possible to beat the manufacturers figures. To be honest I'm not sure i could knock anything off that figure and it does seem to take a lot of effort/luck (not talent as i don't have that) to get the time.

Here are my current best times for some other intervals:
40-60mph = 2.5s
60-80mph = 3.6s

Sadly I couldn't work the phone while driving to get a screen shot of the times so everyone will just have to take my word for it.... unless I do it again of course.
So it CAN be done! Brilliant! Any tips on how to get that time? Launch revs, sidestep the clutch or just feed it in slowly etc?
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      04-10-2013, 01:03 PM   #48
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Quote:
Originally Posted by mowflow View Post
Sadly I couldn't work the phone while driving to get a screen shot of the times so everyone will just have to take my word for it....
I don't doubt you, but a tip might be to add a button for taking screen shots.



Btw, does anyone know why it says "Ready". I'm not even in my car! Does it mean that the acceleration times use the GPS-speed? Or maybe it only does so when the OBD-speed isn't available...?
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      04-10-2013, 04:12 PM   #49
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Great tip. Never knew I could do that.

My technique was to rev the car to around 2k I then let it drop a bit and as I went to bring it up I lifted the clutch as quickly as I could and stuck the accelerator through the floor. Didn't take my hand of the gear lever eyes fixed on the revs. Clutch in and out as quick as possible each shift, full throttle back in every time. I'm no drag racer so I don't know any other techniques. Probably better ways of doing it. Oh yeah I was in sport+ so might even try again with full safety net off.

It was a very odd feeling actually, the car felt really smooth and really powerful on the attempt that gave that time. The pull was just constant, the engine felt smooth and the traction felt brilliant. I got less spin in first and when rolling the tyres chirped rather than lost traction at shifts. They maybe had more heat due to the attempt before it.
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      04-10-2013, 05:29 PM   #50
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Quote:
Originally Posted by mowflow View Post
Great tip. Never knew I could do that.

My technique was to rev the car to around 2k I then let it drop a bit and as I went to bring it up I lifted the clutch as quickly as I could and stuck the accelerator through the floor. Didn't take my hand of the gear lever eyes fixed on the revs. Clutch in and out as quick as possible each shift, full throttle back in every time. I'm no drag racer so I don't know any other techniques. Probably better ways of doing it. Oh yeah I was in sport+ so might even try again with full safety net off.

It was a very odd feeling actually, the car felt really smooth and really powerful on the attempt that gave that time. The pull was just constant, the engine felt smooth and the traction felt brilliant. I got less spin in first and when rolling the tyres chirped rather than lost traction at shifts. They maybe had more heat due to the attempt before it.
What RPM did you change gear at?
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      04-11-2013, 04:38 AM   #51
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It was around 4500. You really have to be on it to catch the 1st-2nd shift well.
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      04-15-2013, 03:16 PM   #52
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I don't know if I trust the OBD2-numbers. I gave it a go today to see what I could manage. On a completely level road, I managed 7,4 seconds to 100 km/h. That's just one tenth away from the factory number of the original 184 hp 120d, but I have the downtuned version with 163 hp which is supposed to do 0-100 in 7,9 seconds. Half a second better than the factory number seems too good to be true...

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      04-15-2013, 04:42 PM   #53
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Maybe it is not as detuned as it says on paper.
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      04-15-2013, 04:54 PM   #54
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Perhaps. It does say 100 kw at the wheels. If there is a loss of 15 %, then that means 118 kw, or 160 hp at the crank. Right? Also, I'm not sure if I've sat the "Max dial RPM" correct in the vehicle profile, or if this actually has any effect on the calculation of power. The dial in the dash goes to 6k, but I'm never going to see anything close to that, so I just put 5k in the profile.

Now I want the M Performance Power Kit just to see how the car will fare with the extra power.
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      04-16-2013, 05:23 AM   #55
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It's common for BMW to only downtune on paper and not actually downtune the engine.
I recall once, my dad had a Cooper S Clubman with 163hp and my brother had one without the downtune, so all 175hp.
We had a rolling start drag race and we were right next to eachother the whole time.

I'll take a shot with my 125d sport auto when it's out of break-in period..
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