economy tuning
Evolving Member
Joined: Nov 2007
Posts: 159
Likes: 14
From: Colorado
well I am not posting anymore until someone:
1) tells us what their trims are
2) changes the closed loop idle section of their fuel map to 7.4
3) flashes and waits for trims to stabalise
4) tells us the fuel trims
if #1 and #4 are different (by a decent amount) then the fuel map is used in some degree...
1) tells us what their trims are
2) changes the closed loop idle section of their fuel map to 7.4
3) flashes and waits for trims to stabalise
4) tells us the fuel trims
if #1 and #4 are different (by a decent amount) then the fuel map is used in some degree...
Here is a good diagram for the stealth fuel system. Pretty much a mitsu, right?
Last edited by TurboTJ; Mar 29, 2011 at 11:36 PM. Reason: Image not showing
Well lets see if we can adjust the stoich voltage and see if it will alter closed loop AFR... I am about to switch back to E85 pretty soon, and if this works it would be great...
Also can you do me a favor and look at the routine and see how stoich is calculated after a voltage input is received from the front O2... we know the front O2 is basically a switch and works in conjunction with the STFT to maintain stoich, but I would like to know exactly how the IPW/IDC is calc'd afterwards.
Thanks
Also can you do me a favor and look at the routine and see how stoich is calculated after a voltage input is received from the front O2... we know the front O2 is basically a switch and works in conjunction with the STFT to maintain stoich, but I would like to know exactly how the IPW/IDC is calc'd afterwards.
Thanks
From what I can tell however it appears to all be based inside of the big CAS sub. There are two variables which i'm calling O2_Trim_Adder and Subtractor which are appended to the current o2 trim following a bitwise decision on how much should be applied.
The two variables themselves seem to be created on one subroutine. The routine itself splits into two personalities which is a default mode and a lookup mode. Based on the inputs from the rom it looks like its permenantly set to the lookup mode.
This is where things get a bit sticky for me. The routine itself has a base value with two options which are multiplied with a lookup table for both the subtractor and adder variables. The axis value i can't figure out but since it handles both of these adding and subtracting variables I think its really some offset ADC volts from the desired voltage.
The tables for the 9417 rom I'm disassembling are located here:
<table name="O2 Trim Table" address="51ca" type="2D" level="1" scaling="O2 Trim">
<table name="X" address="6d3c" type="X Axis" elements="11" scaling="VoltsADC1023"/>
</table>
<table name="O2 Trim Table" address="51DC" type="2D" level="1" scaling="O2 Trim">
<table name="X" address="6d3c" type="X Axis" elements="11" scaling="VoltsADC1023"/>
</table>
Mystery Voltage Compare:
<table name="Front O2 Volts" address="1f7e" type="1D" level="1" scaling="Volts16"/>
Subroutine locations for the trim are:
0x15412
0x24DC4
0x13194
Newbie
Joined: Jun 2008
Posts: 34
Likes: 0
From: UA
Hello everybody!
What is the best timings for fuel economy in 0-3000rpm and 0-100 load?
I can not find the limit - for example this map has zero knock. Should I add even more timing in 1500-2500 area? Let's say make it 40-43? Possibly better fuel economy in this area will be on stock timing?
Second issue is mivec in the same area - it has even more influence on how smoth the car goes, and possibly less degree (than in my map) is even better?
Looking for comments.
Thanks)
What is the best timings for fuel economy in 0-3000rpm and 0-100 load?
I can not find the limit - for example this map has zero knock. Should I add even more timing in 1500-2500 area? Let's say make it 40-43? Possibly better fuel economy in this area will be on stock timing?
Second issue is mivec in the same area - it has even more influence on how smoth the car goes, and possibly less degree (than in my map) is even better?
Looking for comments.
Thanks)
Last edited by evodomUA; Dec 26, 2012 at 06:22 AM.
Hello everybody!
What is the best timings for fuel economy in 0-3000rpm and 0-100 load?
I can not find the limit - for example this map has zero knock. Should I add even more timing in 1500-2500 area? Let's say make it 40-43? Possibly better fuel economy in this area will be on stock timing?
Second issue is mivec in the same area - it has even more influence on how smoth the car goes, and possibly less degree (than in my map) is even better?
Looking for comments.
Thanks)
What is the best timings for fuel economy in 0-3000rpm and 0-100 load?
I can not find the limit - for example this map has zero knock. Should I add even more timing in 1500-2500 area? Let's say make it 40-43? Possibly better fuel economy in this area will be on stock timing?
Second issue is mivec in the same area - it has even more influence on how smoth the car goes, and possibly less degree (than in my map) is even better?
Looking for comments.
Thanks)
Newbie
Joined: Aug 2011
Posts: 14
Likes: 0
From: Ukraine
Your timing is more advanced than what I use for best mpg for high octane fuels. The normal setting is 34-38* at cruise. This may be because you are not using EGR, or because you have zeroed out the EGR advance tables, which can add up to 8* of advance on top of your ignition maps. The total advance at cruise with EGR is from 42-48*.
Knock is not counted by the stock ECU under 60 load @ 2500 RPM, or 70 load @ 3000 RPM. You can hit pre-ignition (knock) during light cruise if you continue to advance timing but no knocksum is logged by the ECU. Your friend in this situation is a set of det cans. These are headphones connected to a plastic tube, (like a doctor's stethoscope), run through the firewall to a hard mounting point on the block.
Let us know how your testing goes. I have not seen any other threads on EvolutionM where people have experimented with advanced timing on 95-98 RON to increase MPG.
Knock is not counted by the stock ECU under 60 load @ 2500 RPM, or 70 load @ 3000 RPM. You can hit pre-ignition (knock) during light cruise if you continue to advance timing but no knocksum is logged by the ECU. Your friend in this situation is a set of det cans. These are headphones connected to a plastic tube, (like a doctor's stethoscope), run through the firewall to a hard mounting point on the block.
Let us know how your testing goes. I have not seen any other threads on EvolutionM where people have experimented with advanced timing on 95-98 RON to increase MPG.
Then log PSIG and see how much vacuum you pull at a certain target cruise speed.
Then go back and change the static value by 5-10* and go back and cruise the same speed and road. Try to hit the same loads and see if the PSIG vacuum was higher or lower than the last setting at your desired cruise speed.
The point is that more vac means more VE for the given load/rpm. So you can basically target say 40mph at 35 load and set a static 10* advance. You may pull -7 vac. Then you adjust for static 15* advance. You see -8 vac. Okay that was better, now try 20* advance. Ooops now it's -6 vac, you went backwards.
Do this for all the major cruise points with both the intake and exhaust cam. 1 at a time obviously. That should help you quite a bit with mileage if done properly.
Good luck!
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