[XutvJet]

I've had my 2016 235 6MT (completely stock) since February. The car has been great. Between Feb and late April, I didn't romp on it too much in 1st gear because the car was so traction limited in first due to the rock hard Michelin PSS tires in the cold, colder ambient conditions, dirty streets from winter, etc. I'm no stranger to driving manuals (been driving since the early 1990s, owned many manual cars).

One thing though, I cannot for the life of me get this thing to chirp the tires on a 1-2 shift. I'm a pretty fast shifter and spent many years at the drag strip racing many "slower" (12 to 14 second) cars including FWD, RWD, and AWD so I do know how to abuse a manual

In Sport+ when I wind out 1st to 6500-7000rpms and grab the 2nd as fast as possible, the thing just grabs. It feels exactly like my 2012 WRX did on the 1-2 shift meaning all grip. Now keep in mind conditions have been warm to hot (75-95 degrees) since I started trying this and it's usually during the day on warm/hot pavement.

Yesterday I went out of a spirited drive on winding back country roads while in Sport+ mode. The car was quite impressive and the first time I really felt like I could explore 8/10ths of it's capabilities (not pushing my luck on the street). What struck me again was how planted the rear was. Only coming out of tight 2nd gear apexes at near full throttle could I get some very margin inner tire spin. Conditions were low 90s, humid, and sunny. Favorable to grip, not very favorable to power. The car took it like a champ though.

So, wall of words later, can you spin the tires on the 1-2? Is the clutch delay valve the culprit here? Should I have all nanny systems turned off? I've watched a handful of videos and hear M235 manuals chirping the 1-2. I don't know the ambient conditions or power levels of those cars though. I will say I don't think this car is down on power because it will easily roast the tires from a roll in 1st, can spin in them occasionally from a 2nd gear/3500-4000rpm roll as well, and my Torque App is showing strong and consistent boost.

[B_Rice]

You do have to disable dsc in order to get slip.

[Tpeterson]

I can get a chirp out of my 228i, occasionally. Maybe it was a bit of heat soak from the ambient 90's temp.
It's a good thing :traction not wheel spin.

[amw896]

it is a bit tough to chirp on mine as well but mine is equipped with the larger 19s and LSD and I am still able to get a chirp into 2nd. Going through your post I noticed that you are shifting higher than I do. If you look at the stock power curve of this motor it literally falls off a cliff post 6400ish rpm. I know when I'm hard shifting into second I barely break 6k. Try shifting a bit lower.

[nike001]

I barely get chirps when hooning around.

Chirps happen more often when I short-shift, less often when I wind it out.

[GioM2Comp]

I can chirp the 1-2 shift almost every time. It does get tougher in 80+ degree temperature. I normally shift at 6500-6800 rpm's.

[MrBucket]

Used to be easy to do before I got the M Performance LSD, now its got to be either cold or some other reason the road isn't grippy to be able to do it.

[XutvJet]

Originally Posted by amw896

Going through your post I noticed that you are shifting higher than I do. If you look at the stock power curve of this motor it literally falls off a cliff post 6400ish rpm. I know when I'm hard shifting into second I barely break 6k. Try shifting a bit lower.

There may be some truth to this. Perhaps I am revving 1st out too long and shifting a little sooner may actually improve torque to the wheels and even acceleration. The reason being, this is a turbo car and not a lot of boost is made in 1st. Shifting a little sooner into 2nd could help create additional load on the turbo (which turbos love).

As for the other shift points, I've done the ideal shift point calculations based on dynos and the gear ratios. Even though power does fall off at around 6200-6400rpms, shifting at near redline is actually ideal for maximum acceleration considering the torque multiplication of the gears.

[nike001]

Originally Posted by XutvJet

shifting at near redline is actually ideal for maximum acceleration considering the torque multiplication of the gears.

BMW engines spin much longer past "redline." Redline isn't particularly made for max spinning revolutions, moreso strategically placed so your next upshift places you back in the meat of the powerband. Revving past redline is a waste of time since there's no power there AND the next upshift will place you out of the powerband as well.

If you've ever done launch control in DCT ///M cars, you'll notice they all short-shift first around ~-5500-5800RPM. (I'm not sure what they upshift at in non-m cars like our 2ers)

[wjones14]

I think it's a combination of the clutch delay valve and turbo lag. Unless you're power shifting, i.e. not lifting off the throttle between shifts, the engine is going to lose revs and have to spin back up again. But it's a turbo engine, so the throttle response is not instantaneous when you reapply throttle after getting off it. Combine that with the clutch delay valve, and it's difficult to chirp the tires on the 1-2 shift. Forget about chirping them on the 2-3 shift.

I haven't really tried it a lot because it's obviously not great for the car, but I have been able to get a little wheel spin on the 1-2 shift - but only in Sport+ and DSC off.

With my previous car, the 2005 Mustang GT, it was ridiculously easy. Even with traction control on, I could easily lay down two thick 20 foot black rubber strips. Turn off the traction control, and the tires would spin almost to the redline in 2nd gear. Even the 2-3 shift was super simple to leave strips of rubber on the road. And none of this was done with power shifting - it was just shifting quickly and mashing the throttle after the upshift. The car was made for it.

So it is possible with the M235i, but it's just not as simple as it is in a NA V8 car. I find the hesitation between the 1-2 shift more annoying than the fact that it's difficult to lay down rubber during hard shifts.

[redontheline]

I let my uncle drive my car last night and he chirped into 2nd in Sport. I don't get much even in Sport+. I do believe he short shifted, so maybe that is the key.

Different but not new thread-worthy - I still haven't fully gotten the feel for when the back end will let loose in S+. Twice, it has stepped way out (once way more than I wanted) but all the other attempts, it just doesn't seem to budge. I'm wondering if smoothly applying all the way to WOT is better than mashing as it gives the processor some time to realize what you are doing before cutting back.