feature request/modification ?

Testing and development of Megasquirt 3

Moderators: jsmcortina, muythaibxr

Post Reply
Blue 12
Experienced MS/Extra'er
Posts: 222
Joined: Wed Jun 22, 2011 6:19 pm

feature request/modification ?

Post by Blue 12 »

in the sequential shift cut feature, would we be able to use a timing retard in addition to or in place of the ign cut?
for example, if we are at about 30 degrees btdc with spark angle and we tell it to pull 45 degrees for 0.06s (firing at 15 degrees atdc) it should unload the motor enough for the air shifter. I know someone doing this with a motec. its supposed to prevent the big pop and bang and keep a turbo spooled up better.
a hybrid system may work best, say retard timing for 0.04 seconds then kill ign for 0.02
2000 ZX-12R LSR turbo Worlds Fastest at 266.5MPH on board video here https://www.youtube.com/watch?v=CruXgKKzBUs
vl-alexander
MS/Extra Newbie
Posts: 19
Joined: Sun May 26, 2013 6:19 pm
Location: Vladivostok, Russia

Re: feature request/modification ?

Post by vl-alexander »

Why not just use second timing table, which will be activated by external switch (shifter) ?
MS3PNP (diy) powered mazda RX-7 FD 13B-REW. bw S366. 410hp pump gas
Blue 12
Experienced MS/Extra'er
Posts: 222
Joined: Wed Jun 22, 2011 6:19 pm

Re: feature request/modification ?

Post by Blue 12 »

it would still kill the ign for the same amount of time as before. i want to trigger a set amount of time to retard the ign, then possibly cut the ign for a very very brief amount of time if need be.
2000 ZX-12R LSR turbo Worlds Fastest at 266.5MPH on board video here https://www.youtube.com/watch?v=CruXgKKzBUs
turbo355
Master MS/Extra'er
Posts: 826
Joined: Tue Feb 21, 2006 11:32 pm

Re: feature request/modification ?

Post by turbo355 »

The bang is from the injectors still firing fuel into the cylinder then when the ign. fires again it pops through the ex. , to fix it, it needs to cut the fuel also, then it will be smooth, when i wrote the code for MS2 to do the shift kill, i had the option to kill the spark, or cut the fuel and spark, and this will not burn holes in the piston ,i hear that sometimes and it will not hurt anything by cutting the fuel and spark .
2000 Suzuki Hayabusa turbo MS3 beta testing Plug and Play standalone


http://interfacepnp.webs.com/
http://www.youtube.com/Busams
Image
Blue 12
Experienced MS/Extra'er
Posts: 222
Joined: Wed Jun 22, 2011 6:19 pm

Re: feature request/modification ?

Post by Blue 12 »

thats the typical "fix", but i dont want to cut fuel, i want to mostly use a set duration of adjustable retard to make the shift so that the engine is still burning most of the fuel during the shift. i only want to do a cut if absolutely necessary.

Motec can do this, MS3 should be able to do it too
2000 ZX-12R LSR turbo Worlds Fastest at 266.5MPH on board video here https://www.youtube.com/watch?v=CruXgKKzBUs
Blue 12
Experienced MS/Extra'er
Posts: 222
Joined: Wed Jun 22, 2011 6:19 pm

Re: feature request/modification ?

Post by Blue 12 »

ive done a copy n paste in the ini file from the nitrous area into the shifter area and got this. not sure if its a step in the right direction or not?
Image
2000 ZX-12R LSR turbo Worlds Fastest at 266.5MPH on board video here https://www.youtube.com/watch?v=CruXgKKzBUs
Blue 12
Experienced MS/Extra'er
Posts: 222
Joined: Wed Jun 22, 2011 6:19 pm

Re: feature request/modification ?

Post by Blue 12 »

i took that out and copied some of the launch control stuff into it. maybe someone that knows what they are doing can make it all work properly??
I want to retard for a set amount of time THEN use a set amount of kill (IF needed) to make the shift. think anti lag during a shift, i dont want to cut fuel.
Image
2000 ZX-12R LSR turbo Worlds Fastest at 266.5MPH on board video here https://www.youtube.com/watch?v=CruXgKKzBUs
Blue 12
Experienced MS/Extra'er
Posts: 222
Joined: Wed Jun 22, 2011 6:19 pm

Re: feature request/modification ?

Post by Blue 12 »

anyone? how do i trigger retard for a set amount of time?
2000 ZX-12R LSR turbo Worlds Fastest at 266.5MPH on board video here https://www.youtube.com/watch?v=CruXgKKzBUs
DeadStiff
Experienced MS/Extra'er
Posts: 151
Joined: Fri Nov 23, 2012 10:12 am
Location: SoCal

Re: feature request/modification ?

Post by DeadStiff »

All the ini does is tell TunerStudio what the firmware is capable of. You have to alter the firmware if you want to add features and the ini to reflect those changes.

If you want the developers to add features you need to give more information as to why the current features don't/won't work for you. Just saying that I want it to work this way isn't likly to get their attention. Get a log showing the current system and clearly state how your method would be/work better.
MS3+X on 73 Karmann Ghia ignition only with LS2 truck coils firing in sequential, fuel next.
2333(103*70) Type 4 with DTM also sitting in living room just need exhaust.
Blue 12
Experienced MS/Extra'er
Posts: 222
Joined: Wed Jun 22, 2011 6:19 pm

Re: feature request/modification ?

Post by Blue 12 »

DeadStiff wrote:All the ini does is tell TunerStudio what the firmware is capable of. You have to alter the firmware if you want to add features and the ini to reflect those changes.

If you want the developers to add features you need to give more information as to why the current features don't/won't work for you. Just saying that I want it to work this way isn't likly to get their attention. Get a log showing the current system and clearly state how your method would be/work better.
the current method kills the ign for a set amount of time, this causes a large backfire when it gets turned back on. this is hard on turbos, hard on exh valves. it also causes a drop in boost just after the shift as the fuel was burned mostly after the turbo.
what i want is to program a set amount of retard to allow the shift rather than killing the ign. its been done by a few bikes that run a Motec. it works well. no bang, no loss is boost after the shift.
2000 ZX-12R LSR turbo Worlds Fastest at 266.5MPH on board video here https://www.youtube.com/watch?v=CruXgKKzBUs
thokes82
Helpful MS/Extra'er
Posts: 102
Joined: Mon Apr 27, 2009 5:02 am
Location: Munster, Germany
Contact:

Re: feature request/modification ?

Post by thokes82 »

Is there a way to use this here as an input?
http://www.geartronics.co.uk/loadcell.htm
Of course I could use an OP Amp as a comparator to make it work but the lever delivers 0-5V allready. Another workaround is that I use an ADC as generic sensor, which then triggers a generic output, which then triggers the "input button" for shift cut. However that is a weird workaround which on top of that consumes 3 pins.

The unit requires an unregulated 12v supply and provides an output of 0-5v which is biased at 2.5v when no load is applied. When mounted in the conventional orientation, the output voltage increases for upshifts and decreases for downshifts. It can therefore be used to trigger an upshift engine cut or a downshift throttle blip.
Image
Race car building documentation: www.kessel.tk (nice pics but only german laguage so far...)
Post Reply