Patch for Failsafes on stock ECU
#32
Evolved Member
Thread Starter
iTrader: (17)
Join Date: Nov 2005
Location: NNJ
Posts: 2,544
Likes: 0
Received 0 Likes
on
0 Posts
I like the idea of just dropping boost by reducing the WGDC. I think most people who will use this patch will control boost through the ECU so by just dropping WGDC you don't have to worry about outputs or wires or anything like that.
#33
Evolved Member
iTrader: (2)
I just got caught up on this thread .. there are some great ideas here. I also like the idea of dropping WGDC when certain conditions are reached. However, dropping timing would also be a good option for those that don't have ECU controlled boost ...
Here is what I'm thinking ...
If: Knock > X
Then: lower WGDC by Y% and/or lower timing by Zº
I know that the ECU would already be pulling timing, but it you've already hit, say, 12 counts of knock, the ECU obviously hasn't pulled enough timing ... pulling another 2º or so wouldn't hurt. With super high counts it pretty much instantly drops to -10º ... maybe pulling timing is just useless ...
Perhaps a full fuel cut would be another option in severe knock situations ... say knock > 16 = fuel cut.
Obviously this would have the usual load/TPS threshold like the other Tephra patches ...
Here is what I'm thinking ...
If: Knock > X
Then: lower WGDC by Y% and/or lower timing by Zº
I know that the ECU would already be pulling timing, but it you've already hit, say, 12 counts of knock, the ECU obviously hasn't pulled enough timing ... pulling another 2º or so wouldn't hurt. With super high counts it pretty much instantly drops to -10º ... maybe pulling timing is just useless ...
Perhaps a full fuel cut would be another option in severe knock situations ... say knock > 16 = fuel cut.
Obviously this would have the usual load/TPS threshold like the other Tephra patches ...
#35
Evolved Member
Thread Starter
iTrader: (17)
Join Date: Nov 2005
Location: NNJ
Posts: 2,544
Likes: 0
Received 0 Likes
on
0 Posts
I really think the idea of switching to low octane fuel & timing and also having a universal reduction in WGDC is the way to go. This would allow you to basically have 2 failsafe maps....one for meth/race and one for pump.
This way you can drop timing by say 2 degrees or so, add a bit of fuel, and also drop WGDC by 50% lets say. This will significantly reduce any knock going on, boost alone would probably be enough but the timing and fuel would be nice too.
I think this would also be pretty easy to implement since you don't have to add any new tables.
This way you can drop timing by say 2 degrees or so, add a bit of fuel, and also drop WGDC by 50% lets say. This will significantly reduce any knock going on, boost alone would probably be enough but the timing and fuel would be nice too.
I think this would also be pretty easy to implement since you don't have to add any new tables.
#37
EvoM Guru
iTrader: (8)
Well we could have a custom XML for the modded rom. Maybe give it a new ID?
This brings up a good point. If you are just decreasing boost, then your AFR will be leaner at 15psi than at 26psi because the load will be much less. Of course it's also 11psi less.
I really think the idea of switching to low octane fuel & timing and also having a universal reduction in WGDC is the way to go. This would allow you to basically have 2 failsafe maps....one for meth/race and one for pump.
This way you can drop timing by say 2 degrees or so, add a bit of fuel, and also drop WGDC by 50% lets say. This will significantly reduce any knock going on, boost alone would probably be enough but the timing and fuel would be nice too.
I think this would also be pretty easy to implement since you don't have to add any new tables.
This way you can drop timing by say 2 degrees or so, add a bit of fuel, and also drop WGDC by 50% lets say. This will significantly reduce any knock going on, boost alone would probably be enough but the timing and fuel would be nice too.
I think this would also be pretty easy to implement since you don't have to add any new tables.
#38
Evolving Member
iTrader: (14)
Join Date: Feb 2006
Location: Westchester, NY
Posts: 305
Likes: 0
Received 0 Likes
on
0 Posts
I really think the idea of switching to low octane fuel & timing and also having a universal reduction in WGDC is the way to go. This would allow you to basically have 2 failsafe maps....one for meth/race and one for pump.
This way you can drop timing by say 2 degrees or so, add a bit of fuel, and also drop WGDC by 50% lets say. This will significantly reduce any knock going on, boost alone would probably be enough but the timing and fuel would be nice too.
I think this would also be pretty easy to implement since you don't have to add any new tables.
This way you can drop timing by say 2 degrees or so, add a bit of fuel, and also drop WGDC by 50% lets say. This will significantly reduce any knock going on, boost alone would probably be enough but the timing and fuel would be nice too.
I think this would also be pretty easy to implement since you don't have to add any new tables.
Now what triggers do you guys think should be included? JDM MAP, 2 byte load, TPS, RPM, Knock Sum, Spare ADC inputs for wideband and possible meth flow. Should there also be a timer, where the conditions have to be met for a specified time before the failsafe engages?
I would like to see how Tephra feels about all of this, and to get his input.
#39
Evolved Member
Thread Starter
iTrader: (17)
Join Date: Nov 2005
Location: NNJ
Posts: 2,544
Likes: 0
Received 0 Likes
on
0 Posts
I think 1 WGDC table will be enough. And then just have a universal drop amount. You don't need another entire table as that much precision is not needed. There should just be a paramater for how much you want to drop boost by. So if the table says 80% WGDC and then you have a failsafe condition, it will drop the WGDC by whatever you input, say 40% in this case.
This would be perfect as you can controll if you want boost to drop by only a few psi, or if you wanted you could drop to wastegate pressure. Its all up to the end user based on what they want.
This would be perfect as you can controll if you want boost to drop by only a few psi, or if you wanted you could drop to wastegate pressure. Its all up to the end user based on what they want.
#41
Evolved Member
iTrader: (4)
Join Date: Apr 2002
Location: chicago area
Posts: 906
Likes: 0
Received 0 Likes
on
0 Posts
tepheras maps (low octane fuel/ ignition) do interpolate during knock events, correct? if we add low octane boost maps and a hard threshold that drops wgdc a specified amount and goes completely 100% low octane maps with no interpolation for a specified # of seconds or until throttle lift, that would cover the fail safe pretty well
Thread
Thread Starter
Forum
Replies
Last Post
FS[West]: Zeitronix ZAVT-1 Warning Box
CO_VR4
For Sale/WTB - Engine / Drivetrain / Power
1
Dec 22, 2016 05:59 PM
Andrew@AMS
Automotosports - Illinois
7
Sep 18, 2012 07:01 AM
tonyboy
Evo X Engine Management / Tuning Forums
2
Dec 9, 2009 09:59 PM
NIevo
Evo Engine / Turbo / Drivetrain
39
Aug 22, 2007 04:36 AM