First I've heard of someone putting that in our car. My random guess will be that the car thinks it's F'd up and trying to fix itself...or your idle control valve is going bonkers because of this device.

Guess you're drag racing?

 

Not drag racing at the moment but I want to do it some day with this car.

I could do a video tomorrow and post it.

Gone check the tps voltage while the 2step is active.

Is there anyway to read rpm from the wire that goes to the ignition coil (bofore the ignition coil).

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Sounds like the TPS is loosing it's mind.

I would run ISTA an monitor the TPS that way, there may be an OBC option to read it out.

 

What is Ista?
The reason why I wanted to use the ignition coil for rpm is to see when exactly the ignition is cut and when it is back to normal so I know if the dme is causing any problem.

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I can't upload the video here because of file type, what video format can I upload here?

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Most people usually upload their videos to the major video sites (youtube/pornhub) and then link to here in the forums.

 

Here is the video on what's happening.

https://youtu.be/Yug1mfHw_dM

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Given that the accelerator pedal's got a pretty sophisticated failsafe system built into it,
I bet you have pedal fault codes now, and that the ecu's not happy about the 'Stang box
trying to dick with the throttle signal.

But I'm guessing...

Rather off topic, why does one need spark cut to flat shift?
I mean, yes, its a bit easier on the clutch, but then, that's
half the performance advantage of doing so...

t
not much help, I'm afraid...

 

Rather off topic, why does one need spark cut to flat shift?
I mean, yes, its a bit easier on the clutch, but then, that's
half the performance advantage of doing so...

Better question is why would you use a flat shift with an H pattern shifter. Sequential gearbox is a no-brainer

 

Here you go 2 step set to 4k.
https://youtu.be/pDrfzJgI-ak

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If possible. Try datalogging with TunerProRT. You can monitor peddle input vs throttle body input. This way you’ll be able to see if the ECU is adjusting throttle input or if something else is going on.

Sorry I’m not much help. Just figured I’d make that suggest :/


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That's actually a really good idea as long as it give me both both voltage. Now I just need see how to us TunerProRT.

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My new idea is that you take that thing out and just use the pedal to get to whatever rpm you want and enjoy the car for as long as I've had my 328i (now just past 369,000 miles). I guess that's not going to happen, though. Got a good laugh from this thread, though, so thank you for that Nicker!

 

Funny answer but I will not give up tho. I know you like you car stock, some people like to modify cars and some like to understand why things do what.

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I just read about that device.

Does it really momentarily cut the ignition voltage to kill engine power while you shift?

If so, that's horrible. I'll bet the ECU sets every error that it has when that happens.

 

Depends, if you flash your ecu then you can get past with the engine error code. I set my miss fire detection up to 2500 and does not detect miss fire past that set rpm.

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Isn't there a way to "tune" a stock launch control option on MS43 cars? https://www.youtube.com/watch?v=BFwdIiqxtbk
I'm assuming OP's way is either easier or his car is not MS43?? I am not versed in engine tuning for these cars, just trying to help and learn

 

My car is a ms42 so there is not really a setting for that.

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Well, around here we call the thing you put on the back of your pickup to make it into a minivan a "canopy",
so it very well could be a regional thing, or an age thing... (because when I learned how to do this riding with
my hooligan older neighbor, there was no rev limiter, just valve float...) or just me getting my terms confused.
Oh, I suppose I could blame that on age, too...

Yeah, I'm not saying that it's GOOD, just that when we looked at speed traces of my car on the long PIR front straight,
against 2 other cars, all 3 PRO3 cars, equal engines, my car had noticeable drops at each gear change.
One car had slight dips, and the third, you couldn't really tell from the trace where he'd shifted.
His answer- "You don't lift to shift these cars." So I went out to duplicate his trace, and sure enough,
foot flat, I picked up about 4 mph, dropped .6 sec, and critically, could just stay in the draft of a
car with a 'slightly more stock' engine.

You won't be surprised to hear that transmissions in this class don't last all that long.

Personally, I only do it when it really matters- if I'm really after someone, or
really trying to stay ahead. And yeah, even a bit of a lift is a lot less hard on
the equipment for a minor loss in drive...

t
bekuz racekar

 

Well that makes sense but remember you still have to clutch the car to gain the next gear then that ends the flat shift, period. I have run PIR many times, my last run there was last year clinching the Trans-Am West Coast Championship and I know that chicane well. My professional drivers will make their gear shifts at 300ms using a H pattern box and that is fast. That 300ms is basically the clutch in and out time so remaining on the throttle during that time is pointless. The RPM of the next gear is going to be a constant gear drop RPM value, regardless of throttle position. Save your clutch and syncros in the gearbox and just be smooth and deliberate on your shifts. The last H pattern gearboxes I used were the Porsche 996 Cup cars back in 2005. We use X-Trac sequential boxes in our Trans-Am and IMSA LMP3 cars now and sequential dog type gearboxes with Megaline air shift systems in the Porsche Cup Cars and IMSA LMP3 cars and those upshifts take less than 80ms. You could try to use a SMG box on your BMW efforts that is essentially hydraulically actuated, fully automated H pattern box.

Here's a quick video of our Trans-Am team.

https://youtu.be/h93IbUYwWt0

 

remaining on the throttle during that time is pointless.

It's not, quite. If you keep the engine on the limit (in our case, about 6800 for most of us)
the 'dump' into the next gear transfers most of that energy into forward momentum.
And in a class that requires a full mass crank and flywheel, there's some energy there.

I would have said 'aww, that's so minimal, it can't matter'
except that we also use data.
And when I compared traces shifting deliberately and mechanically sensitively
to ones that were increasingly more aggressive, it did in fact matter. Keeping the revs at redline
and dumping that energy into the driveline at the next shift made a small, but noticeable difference.
And those differences added up to a competitve advantage.

Especially WITHOUT that f^%$ing chicane...

I'll go dig up the data when I get home.

t

 

I was at VIR the day the Burton video was shot. Lawrence Loshak had the pedal down and shredded the circuit that day! Lots of good competition and hard racing to include awesome Vintage Trans Am Racing (60's and 70's T/A car). Was even impressed with the Corvairs as well.

I guess with the E46 in a basically stock configuration, the car may benefit from keeping the revs up while shifting since there is not much extra power on tap at the upper RPM range.

But the thread is about a 2 Step box which is primarily for drag racing and not road racing from my experience.

 

Hoping to see some valid data showing the time variance on these shift gains like my graph shows. The Spec E46 class is indeed a momentum class much like Spec Miata but in my world the "momentum" is carrying more speed through corners, not abusing the clutch and gearbox. Not to mention upsetting the chassis in these mid corner shifts he supposedly shows as gains. :dunno:

 

What data logger to get that data?

Is BMWlogger any good to collect data?

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Here is my first data log on the 2 step.
The pedel position sensor and the mdk seem to be fine. What else could cause this problem? Maybe the adaptation maps?

The wotbox was set to 4k rpm.

Please ask for more information or want to take a look at the log data file.

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Here is my first data log on the 2 step.
The pedel position sensor and the mdk seem to be fine. What else could cause this problem? Maybe the adaptation maps?

The wotbox was set to 4k rpm.

Please ask for more information or want to take a look at the log data file. View attachment 767427

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Why did this post 2 pictures? Nvm both are the same pictures

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Hello guys,
I finally found out what the problem was.
I was looking around on the Internet about the wot box firmware and no one wrote about the current firmware 4.8 so I just simply downgraded it to 3.2 and it works 100% fine.

Thanks for everyone who contributed with this issue and I hope it helps anyone in the future who are desperate for 2 step xD.

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