ISCV control system disassembly
Yea, it's for the first 3 seconds or so. I've been playing with that table and it's been helping. The latest map I tried this morning was quite good, I'm happy with how progress is coming.
Cleaned my IACV, reinstalled, acted the same. Cleaned and swapped in another one from an evo9 I have here(it had the later design unit in it), appears to be the same.
It's warmer here this evening than it normally has been, so I'm going to try it again in the am, although I expect the same results.
Thinking some more on it, a few times before, after pulling the fuse to clear the fuel trim, I have started the car and had it instantly take off to ~3000rpm. Is it possible that it has been setup so far off that the trim learning has gotten in the way of my cold start now as well??
EDIT: Just cleared the trims for giggles, and started it up. ECT was 118, but it still hit 2600 before it shut the IACV and dropped back down to ~1200 like it's supposed to be..
I took 15% from the startup adder, so I'll see how it does in the am.
It's warmer here this evening than it normally has been, so I'm going to try it again in the am, although I expect the same results.
Thinking some more on it, a few times before, after pulling the fuse to clear the fuel trim, I have started the car and had it instantly take off to ~3000rpm. Is it possible that it has been setup so far off that the trim learning has gotten in the way of my cold start now as well??
EDIT: Just cleared the trims for giggles, and started it up. ECT was 118, but it still hit 2600 before it shut the IACV and dropped back down to ~1200 like it's supposed to be..
I took 15% from the startup adder, so I'll see how it does in the am.
Last edited by ExViTermini; Jan 9, 2013 at 03:59 PM.
Cleaned my IACV, reinstalled, acted the same. Cleaned and swapped in another one from an evo9 I have here(it had the later design unit in it), appears to be the same.
It's warmer here this evening than it normally has been, so I'm going to try it again in the am, although I expect the same results.
Thinking some more on it, a few times before, after pulling the fuse to clear the fuel trim, I have started the car and had it instantly take off to ~3000rpm. Is it possible that it has been setup so far off that the trim learning has gotten in the way of my cold start now as well??
EDIT: Just cleared the trims for giggles, and started it up. ECT was 118, but it still hit 2600 before it shut the IACV and dropped back down to ~1200 like it's supposed to be..
I took 15% from the startup adder, so I'll see how it does in the am.
It's warmer here this evening than it normally has been, so I'm going to try it again in the am, although I expect the same results.
Thinking some more on it, a few times before, after pulling the fuse to clear the fuel trim, I have started the car and had it instantly take off to ~3000rpm. Is it possible that it has been setup so far off that the trim learning has gotten in the way of my cold start now as well??
EDIT: Just cleared the trims for giggles, and started it up. ECT was 118, but it still hit 2600 before it shut the IACV and dropped back down to ~1200 like it's supposed to be..
I took 15% from the startup adder, so I'll see how it does in the am.
Is there any way to reset ISCV trims? My AC ON trim is at 13.x% and it'd be nice to reset it to zero now that I'm running basically stock ISCV tables.
Also, my cold idle is getting to be very good now! The spike isn't too bad (goes to about 1600-1700 now) and there is no more surging.
Also, my cold idle is getting to be very good now! The spike isn't too bad (goes to about 1600-1700 now) and there is no more surging.
Is there any way to reset ISCV trims? My AC ON trim is at 13.x% and it'd be nice to reset it to zero now that I'm running basically stock ISCV tables.
Also, my cold idle is getting to be very good now! The spike isn't too bad (goes to about 1600-1700 now) and there is no more surging.
Also, my cold idle is getting to be very good now! The spike isn't too bad (goes to about 1600-1700 now) and there is no more surging.
I remember reading in this thread that Jamie asked the same question.
I had this problem when I was playing with mine. It's like 25F outside and the AC compressor just doesn't kick in enough time for the trim to readjust. What helped was putting recirc/full heat/full feet/AC on and I pretty much doubled AC compressor duty (because it take hot air from feet area and push hot air to feet area). Also disconnecting AC fan would help a lot in this case.
Last edited by domyz; Jan 9, 2013 at 06:11 PM.
I will have to see if the trims are logged at the moment. Like I said when I undo the fuses under the hood to reset my fuel trims(damn evo 8...), it seems to make the idle "reset" as well. I'll have to log it and confirm.
)I found my note on this
"Evoscan trims… battery reset, zeroed trims = -1,17%... Evoscan error?"
I even noted that evoscan has an error in reading because when I reset trim they seem to set at -1.17%
Last edited by domyz; Jan 9, 2013 at 06:27 PM.
Reset only works on the evo 8's. Just shut the car off and pull this fuse for 5 seconds and reinstall. It resets all fuel and idle trims on the evo 8's.
-Jamie.
-Jamie.
Last edited by Dynotech Tuning; Jan 9, 2013 at 08:12 PM.
for our friends with IX it'll useful to find what's up with these values staying stored into ECU ROM memory.
What are your MUT16 steps and idle RPM at 180F?
And what is your MUT08 trim?
You could try to zero idle trim playing with 180F initial steps, as the trim start to adjust over 171f. (positive trim=raise initial steps.. and the opposite)
Another suggestion would be trying to set the BISS to another position, then reset trim with inital table. It would change the ISCV effect on idle for each single step. It could help.
A thing to try would be Raptord idea about cleaning the entire ROM: Sometimes we play with XMLs/roms and mess something. Just make sure that your defs are ok.
Last edited by domyz; Jan 10, 2013 at 06:48 AM.
Ok, the rom Im using now is a fresh v7 9417.
Ive set the biss to a diff area twice when i was switching between 9653 and 9417.
Operating temp idle is 1000 rpm, 22-25 steps. Idle trim learn is -1.17( which I think is the '0' point as the ac on trim is the same).
Ive set the biss to a diff area twice when i was switching between 9653 and 9417.
Operating temp idle is 1000 rpm, 22-25 steps. Idle trim learn is -1.17( which I think is the '0' point as the ac on trim is the same).
22-25 steps you're in the range.
-1.17 yes as I said above you're right it's the trim zero. (evoscan error maybe)
I'm out of ideas, and not positive about that being ISCV related. Jamie (Dynotech) has much more experience than me about idle issues. Maybe he messed with a similar problem in the past.
-1.17 yes as I said above you're right it's the trim zero. (evoscan error maybe)
I'm out of ideas, and not positive about that being ISCV related. Jamie (Dynotech) has much more experience than me about idle issues. Maybe he messed with a similar problem in the past.
Is there any way I can get the AC-enabled idle conditions to max out the stepper assembly? Related to my anti lag thread.
Ive been trying to sort out the thread, but its really unclear, especially since I have 8858 and I think Im missing some def's that arent available.
Full ISC idle in my car is 3100 RPM.
another reiteration of that question is, which table actually relates to increase demand once the AC switch is pressed.
Ive been trying to sort out the thread, but its really unclear, especially since I have 8858 and I think Im missing some def's that arent available.
Full ISC idle in my car is 3100 RPM.
another reiteration of that question is, which table actually relates to increase demand once the AC switch is pressed.
Last edited by 211Ratsbud; Jan 18, 2013 at 09:30 AM.