Ive been spending a lot of time working with VEMS standalone and it seems like it really helps to be able to retard timing at a certain RPM before the spark cut occurs. why i have the idea is because i have been working on an A4 1.8T with a T3T04B on it and with spark cut LC it will backfire and build boost for like only a second than the backfiring stops and its just like an RPM limiter with no more building boost. i think that being able to retard timing will allow more control over how much boost a turbo will make during launch control.

This is how i planned on laying out the code for it. im cutting out the NLS code for now just for testing reasons.

1. B kuppl=if yes go to 2.vfil w-if no go to normal routine.
2.Vfil w gets compared to constant=if yes go to 3.Nmot W-if no go to normal routine.
3.Nmot gets compared for timing retard RPM first. say a 1000RPM before LC RPM.=if yes go to 4.zwout-if no go to normal routine.
4.Zwout is compared to a negative timing constant. jump directly to 5.nmot for RPM compare again.
5.Nmot is compared for launch control RPM. if yes go to tsrldyn_Zeros (spark cut).

also in this code setup i considered adding TPS% comparison before or after 2.Vfil w just to make sure it cannot activate under normal driving.
lastly the only part im having a hard part understanding in the code is the jumps at the end of each step. for example at the end of the RPM comparison for launch control the hex is 9D 0B. i understand 9D is Unsigned Greater Than or Equal to but the 0B just doesnt make sense. 0B hex is 11 decimal. but if i count 11 bits forward in the code it doesnt jump to the second clutch switch check. could someone explain how the jumps work please because thats the only thing i dont get.

-15 degrees
https://youtu.be/659dhhM3xWg

I am a noob at ASM but I found usefull to write it in keil to get the jumps right, I could not understand its logic either ...

I did end up doing a crude patch to the original routine which i replaced vfil_w with zwout and set it to the maximum timing retard. it didnt really seem to make a difference in how the car acted. i did a log during the testing and it is pushing the negative timing constant into zwout but no visual or audible difference in how the car acted. i have been thinking about trying a different setup which ditches pushing 0 to tsrldyn and instead modifying the crank/cam angle value by pushing a false value to wnwkwas_w than adding timing retard on before that. only reason im thinking about modifying wnwkwas_w instead is because thats now most aftermarket standalone ECU's achieve their launch control. this is all just ideas but when i have free time i will modify a file for my car and see what it does.

If it works you'll hear it  This is 12 degrees atdc. The routine is much more complex than the popular patch, and hooks directly in zwout.
https://youtu.be/X7F_kjVJjEM

It starts retarding at 3500 and cuts spark at 4000 in this video. I have been working on additional fuel enrichment on this function too, but I made some register stack errors and then left it for future experiments because it had no priority. I have been talking to Mazer about this a lot during the time (it is based off his function) and the goal was to set fuel enrichment based on actual boost to help maintain boost pressure through a 2D map. I also want to do a 2D map for timing retard based on rpm to get a bit more control, there is no point in 3D maps with TPS for me because I just want to have the pedal floored in this function. At the time I just added adjustability for both RPM setpoints by pressing brake and setting the desired rpm with the throttle and cruise control, more for experimental purposes than as a permanent functionality because it is a bit crude. I just wanted to be able to set the ideal rpm points for my setup without reflashing all the time, but you still have to flash for timing settings. When I have my new engine ready I might start working on this again, because it is a fun feature. Also very detrimental on about every part in the drivetrain, especially in my case where I try to launch a 4000lb+ vehicle on 10" wide wheels.
btw, I am not planning on releasing code because I did not design the base function. I just try to return the favor to Mazer by providing a couple of plug in features for him
 to use. If he ever releases the code to the public I will be happy to add my plugins for free use.