ISCV control system disassembly
So I started messing with the ISCV demand readings on our 95% bone stock evo 8 to get some base numbers.
The first thing I tried to do was set the BISS with Evoscan to 850 rpm per instructions someone posted from some service manual. Doing so would force the idle to rev up to about 1000 rpm when the actuator was disabled but there was not enough ISC adjustment to bring the idle back down (I waited until the ISC Steps in evoscan wouldn't go any lower).
So I decided to adjust the BISS without activating the actuator test in evoscan until I was reading 0% ISCV Demand. Once it reached 0%, I then activated the evoscan BISS actuator test and it reads 750rpm on the nose. I'm assuming this is actually a better BISS target than 850prm?
I also noticed that the ISCV Demand % would adjust itself every 30-60 seconds.
With ISCV Demand at 0%, my ISC Steps at idle with all electrical accessories off (including the radiator fan) reads 22 steps, just as a reference for anyone else.
I'm not sure if any of this is useful to anyone but I figured I would share.
-Jamie
(aka Jack_of_Trades)
- AC and all electrical items are off
- Target idle is 850rpm
- Base ISC Step at operating temp is 7
The first thing I tried to do was set the BISS with Evoscan to 850 rpm per instructions someone posted from some service manual. Doing so would force the idle to rev up to about 1000 rpm when the actuator was disabled but there was not enough ISC adjustment to bring the idle back down (I waited until the ISC Steps in evoscan wouldn't go any lower).
So I decided to adjust the BISS without activating the actuator test in evoscan until I was reading 0% ISCV Demand. Once it reached 0%, I then activated the evoscan BISS actuator test and it reads 750rpm on the nose. I'm assuming this is actually a better BISS target than 850prm?
I also noticed that the ISCV Demand % would adjust itself every 30-60 seconds.
With ISCV Demand at 0%, my ISC Steps at idle with all electrical accessories off (including the radiator fan) reads 22 steps, just as a reference for anyone else.
I'm not sure if any of this is useful to anyone but I figured I would share.
-Jamie
(aka Jack_of_Trades)
Can anyone confirm if the following is correct for 9417? I pulled the definitions out of the Phenem mod Tephra V7 xml. The selected items below seem very odd when compared to 9653 or 9694. The balance of the definitions seem to have correct values. I've searched a decent amount to find the ISCV definitions for 9417 but I am guessing they aren't complete as of yet.
Thanks
Code:
<table name="ISCV Demand CTS Adder #2** (Post WOT) (sub_1F1F8) [sub_1EFC0]" category="ISCV Control" address="5a54" type="2D" level="1" scaling="ISCV_AX2_8"> <table name="Coolant Temp" address="6884" type="Y Axis" elements="8" scaling="Temp"/> </table> <table name="ISCV Demand CTS Adder #2*** (Post WOT) (sub_1F2C6) [sub_1EFC0]" category="ISCV Control" address="5a70" type="2D" level="1" scaling="ISCV_AX2_8"> <table name="Coolant Temp" address="6884" type="Y Axis" elements="8" scaling="Temp"/> </table> <table name="ISCV Demand RPM Adder (Moderated by Baro, IATS) (FFFF6EA8) (sub_204B6) [sub_1EFC0]" category="ISCV Control" address="651c" type="2D" level="1" scaling="ISCV_AX2_16"> <table name="RPM" address="635a" type="Y Axis" elements="10" scaling="RPM"/> </table> <table name="ISCV Demand Baro Adder**** (FFFF7C0E) (sub_1F6E6) [sub_1EFC0]" category="ISCV Control" address="64fe" type="2D" level="1" scaling="ISCV_AX2_8"> <table name="Baro" address="6608" type="Y Axis" elements="5" scaling="Baro16"/> </table> <table name="ISCV Demand IATS Adder**** (FFFF7C0E) (sub_1F6E6) [sub_1EFC0]" category="ISCV Control" address="650e" type="2D" level="1" scaling="ISCV_AX2_8"> <table name="Intake Air Temp" address="6884" type="Y Axis" elements="8" scaling="Temp"/> </table> <table name="ISCV Demand RPM Adder [rpm > 4500, load > 170, speed > 12 mph] (sub_1EFC0)" category="ISCV Control" address="605c" type="2D" level="1" scaling="ISCV_AX2_8"> <table name="RPM" address="635a" type="Y Axis" elements="10" scaling="RPM"/> </table>
Can someone add these adjustments to the Tephra 7 download here: https://www.evolutionm.net/forums/ec...hramod-v7.html
Can someone add these adjustments to the Tephra 7 download here: https://www.evolutionm.net/forums/ec...hramod-v7.html
hey im running 965300706 V7 in place of 96940011, glad im not the only person who isnt satisfied with their idle, mine isnt too bad trying to get a steady idle of 1100 but it typically seems to be searching for it between 1023 and 1250 i checked my ISC demand and its at 22% at idle ...anyone able to point me in the correct direction for this? i do not have idle sensitivity tables or error tables
only other issue im expierencing is after i take the car out of gear either coasting or coming to a sudden stop the rpms drop and the car will either stumble for a few seconds then recover or stall if i dont blip the throttle...anyone else having this problem?
only other issue im expierencing is after i take the car out of gear either coasting or coming to a sudden stop the rpms drop and the car will either stumble for a few seconds then recover or stall if i dont blip the throttle...anyone else having this problem?
Just a quick thing for people to check. If your throttle cable isnt adjusted correctly, leaving the throttle slightly cracked open, or your TPS isn't adjusted properly the car does not know its in idle mode and can wreak havoc on your idle quality. I believe the standard minimum TPS setting in evoscan reads around 13% open at idle. I believe anything 3-5% higher than that will make the ECU consider the car to NOT be idling.
The best way to confirm that your car is in idle mode is to watch your ignition timing at idle. If it swings roughly +/-5 to 10 degrees, it's in idle mode. If its holding a pretty solid timing value, its not in idle mode.
Food for thought.
-Jamie
The best way to confirm that your car is in idle mode is to watch your ignition timing at idle. If it swings roughly +/-5 to 10 degrees, it's in idle mode. If its holding a pretty solid timing value, its not in idle mode.
Food for thought.
-Jamie
Last edited by Dynotech Tuning; Dec 19, 2011 at 01:12 PM.
Yes, "ONLY" if the 'idle stability timing control' table is set to 0, the base timing actuator or BISS actuator are activated. Under ALL other circumstances, idle timing will fluctuate to stabilize the idle RPM.
-Jamie
-Jamie
Last edited by Dynotech Tuning; Dec 19, 2011 at 04:25 PM.
I have a noob question about these tables. Which table should I be adjusting if I want to slow down the RPM drop from 1.5k rpms.
An example, I put the car in neutral when I'm around 4-5k rpms. The RPM needle drops at a good pace, but at soon as it hits around 1.5k rpms, it just drops a lot more quicker. My car is having hard time recovering from that. My idle is set to 1k and biss screw around to 800.
Is there a way to decrease the rate of the rpm drop in my situation?
An example, I put the car in neutral when I'm around 4-5k rpms. The RPM needle drops at a good pace, but at soon as it hits around 1.5k rpms, it just drops a lot more quicker. My car is having hard time recovering from that. My idle is set to 1k and biss screw around to 800.
Is there a way to decrease the rate of the rpm drop in my situation?
I have a noob question about these tables. Which table should I be adjusting if I want to slow down the RPM drop from 1.5k rpms.
An example, I put the car in neutral when I'm around 4-5k rpms. The RPM needle drops at a good pace, but at soon as it hits around 1.5k rpms, it just drops a lot more quicker. My car is having hard time recovering from that. My idle is set to 1k and biss screw around to 800.
Is there a way to decrease the rate of the rpm drop in my situation?
An example, I put the car in neutral when I'm around 4-5k rpms. The RPM needle drops at a good pace, but at soon as it hits around 1.5k rpms, it just drops a lot more quicker. My car is having hard time recovering from that. My idle is set to 1k and biss screw around to 800.
Is there a way to decrease the rate of the rpm drop in my situation?
So I had an Evo 9 come in with +10 ISCV Demand Trim AC Off and I disconnected the battery for 30 minutes while I did other stuff and when I connected it back, fuel trims were reset but ISCV demand stayed the same. How can I easily reset that back to default?
-Jamie
Last edited by Dynotech Tuning; Jan 27, 2012 at 03:32 PM.