native launch control on me7 ecu. includes proof of concept video.

[k0mpresd]

here is native launch control hack built in to me7 ecu.

VNMX The vehicle speed for activating the raised (normal) rev limit. We set this as low at it goes (1.25 km/h) so the launch control shuts off as soon as you start moving off the line.
DNMAX This is the RPM above rev limit when the fuel cut comes on. Tweaking this helps make more boost on the limiter. I use 50 RPM
ITNMXH Dwell time under lower limit before activating the upper limit. We set this to 0 seconds
NMAX Ends up being the launch RPM. I've found 4500 RPM works well.
NMAXOG This is the raised RPM limit which becomes the standard limit. Mine is set at 7100 RPM
TMOTNMX Coolant temp for activating raised (normal) rev limit. We set this at -48 so that it can activate at any coolant temp.
TNMXH This is the time duration of the raised (normal) rev limit. We set this at it's maximum value of 655.3500 seconds. I haven't had a problem yet with this and have been testing for months.

these are the addresses for my b5 1.8t ecu, 4b0 906 018ch. should be pretty close for a b6 ecu. just search the hex.

vnmx 11afb 8bit 1x1 1.25 factor
dnmaxh 16494 16bit 1x1 .25 factor
itnmxh 16498 16bit 1x1 .01 factor
nmax 1649a 16bit 1x1 .25 factor
nmaxog 164a2 16bit 1x1 .25 factor
tmotnmx 1f9ea 8bit 1x1 .75 factor
tnmxh 164a6 16bit 1x1 .01 factor

and the proof:

credits to brandon @ pathfindermotorsports for posting the original hack on s4 mbox.
credits to evan @ absolute for helping me find the last missing piece of the puzzle.

credits to me for porting it to my 018ch ecu. lol. :p

native me7 1.8t b5 quattro launch control:

http://www.youtube.com/watch?v=nDHxPhNPE8s

[Don Supreme]

Good work Ian.

[Dan[FN]6262]

You are amazing

[k0mpresd]

eh? i thought b6 people would be more interested in this.

[MmmBoost]

I've got launch control with my Maestro tune :P

[Sales@RAI]

haha Ian 80% of people have no idea what's going on

[SleeperAvant]

So does this inject more fuel to increase engine load?

[k0mpresd]

So does this inject more fuel to increase engine load?

no. it cuts fuel when the rev limit is hit. i changed the fuel cut off from 50rpm past limit to 0 past limit. so now fuel cut hits and produces a lot more load. before it just seemed to hang at the rev limit and not hit fuel cut.

[k0mpresd]

I've got launch control with my Maestro tune :P

bah. its more fun to do it manually. :p

[A4 TSCHUSS]

Is that thing stock or something? The revs dropped so far down you are just bog, well unless you have power to keep the wheels going from actually having boost and a more powerful engine, then it could be cool. Just have to see if it is as easy to do it to the B6 ecu as the B5. And when does this work? Always? As in if I just tried revving my car in neutral it wouldn't rev but do that instead? Or does the clutch need to be pushed in for it to work? And then how about if I was in neutral with clutch pushed in?

[Sales@RAI]

Ian, how much boost are you seeing?

[k0mpresd]

Is that thing stock or something? The revs dropped so far down you are just bog, well unless you have power to keep the wheels going from actually having boost and a more powerful engine, then it could be cool. Just have to see if it is as easy to do it to the B6 ecu as the B5. And when does this work? Always? As in if I just tried revving my car in neutral it wouldn't rev but do that instead? Or does the clutch need to be pushed in for it to work? And then how about if I was in neutral with clutch pushed in?

the car is completely stock engine wise except for my ecu flash. and i made that video super fast this morning right outside of my neighborhood because i had to get back home. i know it sucks. i just wanted to show it actually works.

its active as long as the car is going <1.25km/h. so sitting still basically. once youre rolling, the higher limit is active. clutch shouldnt matter.

[k0mpresd]

Ian, how much boost are you seeing?

i dont really know. as cheesy as this sounds, i have no in-car boost gauge. ive only ever logged with vagcom. i have a gauge and a pod, i just never made it around to installing it. i guess im lazy.

[Sales@RAI]

so it basically sets a rev limiter at idle?

[A4 TSCHUSS]

So this is both cool and sucks at the same time. I am now stuck with a (whatever I set it at) rev limiter for this launch control and cant actually rev my car to say 7000rpm if I wanted to blaze the tires or just rev it while not moving. But then it is cool that you can have the launch control type feature but it is (either/or) not both. Maybe if there was a flip of a switch or something that could activate, that would be cool.

[k0mpresd]

no. youre using the standard rev limiter as the launch limiter. and tricking the ecu in to letting you use a speed based limiter as the normal limiter.

so nmax (standard limiter) is set to launch rpm, in this case 4500rpm. then nmaxog (speed based limiter) is set to be active after 1.25km/h, which is set to whatever you want (7100 in the example above).

read the descriptions and explanations of the values. is a pretty good hack.

edit: i see what you mean. it basically sets a rev limiter as long as youre not moving. long and short of it.

[k0mpresd]

So this is both cool and sucks at the same time. I am now stuck with a (whatever I set it at) rev limiter for this launch control and cant actually rev my car to say 7000rpm if I wanted to blaze the tires or just rev it while not moving. But then it is cool that you can have the launch control type feature but it is (either/or) not both. Maybe if there was a flip of a switch or something that could activate, that would be cool.

set the limiter at 7000 then. 7k + boost launch. :p

[A4 TSCHUSS]

That would not be good.

[k0mpresd]

just an idea. haha. i need to make a new video when i have some time.

[drjonez]

Well done. If/when I ever get more time in life I'll have to drop you a line...

[lave3k]

Anyone replicated this on a B6 yet?
I took a brief look at my file in those locations and nothing jumped out at me
When I altered the dtc's and immo on this ECU the locations were very similar to examples posted by K0mpresd (you da man)
Looking at it in decimal (base 10)

[IMG][/IMG]

[aLeXliu911]

i want to know what boost you are holding at 4500rpm. please put the boost gauge on your car.
i hope someone can hack our ECU and put anti lag feature on it. i hate the turbo lag, it's wayyyyyyy to long.

[k0mpresd]

Anyone replicated this on a B6 yet?
I took a brief look at my file in those locations and nothing jumped out at me
When I altered the dtc's and immo on this ECU the locations were very similar to examples posted by K0mpresd (you da man)
Looking at it in decimal (base 10)

i sent you a pm. where is your standard nmax located (normal rev limiter)?

[A4 TSCHUSS]

i want to know what boost you are holding at 4500rpm. please put the boost gauge on your car.
i hope someone can hack our ECU and put anti lag feature on it. i hate the turbo lag, it's wayyyyyyy to long.

This doesn't really makes sense. Why you ask, because you don't deal with turbo lag when you are launching the car. You rev it high where you are going to get boost when you let the clutch out and rip away with tires blazing. This anti-lag feature is only used when not moving to help with a more consistent launch at a good rpm which can also be used for someone who isn't so good at launching the car. But once again, there isn't any turbo lag when launching!!

[k0mpresd]

Anyone replicated this on a B6 yet?
I took a brief look at my file in those locations and nothing jumped out at me
When I altered the dtc's and immo on this ECU the locations were very similar to examples posted by K0mpresd (you da man)
Looking at it in decimal (base 10)

here is a quick look at 8e0909518ak ecu.

11d8e cwnmaxmd
11d9e vnmx
168dc dnmaxh
168e0 itnmxh
16900 nmax
16908 nmaxog
1690c tnmxh
2b964 tmotnmx

no guarantees but it looks right. or close enough. :p

want to do some digging? download a stock 018ch file, download the file i posted in my thread in the b5 forum. look at the hex, compare the differences, and compare the hex around the addresses to find the best guess at where your data is located.

btw, i found those in a 75 6E 69 74 72 6F 6E 69 63 20 63 68 69 70 70 65 64 file. ;)

[aLeXliu911]

This doesn't really makes sense. Why you ask, because you don't deal with turbo lag when you are launching the car. You rev it high where you are going to get boost when you let the clutch out and rip away with tires blazing. This anti-lag feature is only used when not moving to help with a more consistent launch at a good rpm which can also be used for someone who isn't so good at launching the car. But once again, there isn't any turbo lag when launching!!

i mean put anti lag while driving, not on launching, so means about 1 psi at idle(900 rpm), and about 5 psi without any load thru out the rpm, and about 10 psi while you let off the gas shifting gears with clutch in. i was doing some rolling race with a 335xi coupe has about 380awhp, and i lost him every single time coz the turbo lag, i get closer when in the boost, but he just keep walking me away once i shift, coz i have to rebuild the boost again, btw, the bmw is automatic.

[dougyfresh]

good job ian.

this is really need to be able to do such a thing with motronic.

[k0mpresd]

i mean put anti lag while driving, not on launching, so means about 1 psi at idle(900 rpm), and about 5 psi without any load thru out the rpm, and about 10 psi while you let off the gas shifting gears with clutch in. i was doing some rolling race with a 335xi coupe has about 380awhp, and i lost him every single time coz the turbo lag, i get closer when in the boost, but he just keep walking me away once i shift, coz i have to rebuild the boost again, btw, the bmw is automatic.

what you need is a diesel. it has boooooooost all the time.

[aLeXliu911]

what you need is a diesel. it has boooooooost all the time.

my friend's STI use vi-pec v88 ecu, idling with anti-lag it makes 1-2 psi already. 3-4k rpm decel around 10-15 psi. 5-7k around 15-20psi decel. it's REALLY loud.
i just hope we can get that anti lag feature too on our ECU.

[bl0wn3ur0]

Isnt anti-lag bad for the engine? I remember reading something that said the way the car builds boost while under no load was very harmful to the engine internals over a long period of time........

I love the launch control idea tho, i will be keeping an eye on this to see what needs to be done on a B6

[k0mpresd]

its active as long as the car is going <1.25km/h. so sitting still basically. once youre rolling, the higher limit is active. clutch shouldnt matter.

i need to amend this. clutch does matter. if you bounce of the lc limiter without the clutch depressed then the ecu throws an epc light and shuts the throttle down. a key cycle is required to get things back to normal.

[FORCE_FED_DUB]

i want to know what boost you are holding at 4500rpm. please put the boost gauge on your car.
i hope someone can hack our ECU and put anti lag feature on it. i hate the turbo lag, it's wayyyyyyy to long.

For those with small port heads, keep the SAI functional and modify the software parameters to have it running any time the car is making less than x boost. The extra air from the pump going straight into the turbo would help out a bit. Much easier said than done, I do admit. Also, it isn't nearly as volatile on engine components as running a retarded spark anti-lag.

[onceover]

Isnt anti-lag bad for the engine? I remember reading something that said the way the car builds boost while under no load was very harmful to the engine internals over a long period of time........

I love the launch control idea tho, i will be keeping an eye on this to see what needs to be done on a B6

All anti lag does is retard the timing SOO far that there is combustion when the exhaust valve starts opening, this exhaust gas then escapes past the exhaust valve and helps spool the turbo

[k0mpresd]

Anyone replicated this on a B6 yet?
I took a brief look at my file in those locations and nothing jumped out at me
When I altered the dtc's and immo on this ECU the locations were very similar to examples posted by K0mpresd (you da man)
Looking at it in decimal (base 10)

i sent you a pm but figured id post it as well.

here is 8e0909518af:

12071 cwnmaxmd, this bit must be set to 01 to activate the limiters.
12081 vnmx
17410 dnmaxh
17414 itnmxh
17434 nmax
1743c nmaxog
17440 tnmxh
291ee tmotnmx

bit map and factor data is the same as what i originally posted.

[613B6]

For those with small port heads, keep the SAI functional and modify the software parameters to have it running any time the car is making less than x boost. The extra air from the pump going straight into the turbo would help out a bit. Much easier said than done, I do admit. Also, it isn't nearly as volatile on engine components as running a retarded spark anti-lag.

New diesel trucks are starting to use this method instead of the harsh anti lag. They use the extra air from the parking/brakes system and dump it directly into the exhaust housing as soon as you touch the pedal for instant boost without all the negative effects of an anti lag.

[mariusg]

Hey everyone! :)

I was trying to port launch control over to 1.8T AWT (4B0906018DC), but without any success. I've managed to identify maps locations (or atleast it looks like them), but I dunno why it doesn't work (car doesn't limit rpm @ 4500 while standing still). Looking for any input ;)

MEMORY LOCATIONS I've FOUND:
VNMX 11B15
CWDNMAX 12219
DNMAXH 16562
ITNMXH 16566
NMAX 16568
NMAXOG 16570
TMOTNMX 16574
TMNXH 16578

BEFORE LAUNCH CONTROL BIN FILE:
http://www57.zippyshare.com/v/95082208/file.html
AFTER LAUNCH CONTROL BIN FILE:
http://www57.zippyshare.com/v/48419024/file.html

[Trev]