Evo IX Unresponsive to Fuel Map Changes.
Jan 25, 2008, 04:16 AM
#18
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Ahhh, very nice, never thought to do that. Maybe my head was soo clouded with what all could be wrong I forgot to do something simple like that...
Feb 6, 2008, 03:52 AM
#19
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So last night the owner and I went out for a full tune session, and here is what turned out. (I am still a little perplexed by it, but never-the-less, it's actually running where I want it to be now.)
It's was partially the wideband, and partially the car. To reiterate:
2006 IX 88590013 ROM with Cams, Intake, TBE, MBC..
After tuning, the car was maxed out at 100% duty at only 21.5psi of boost. From the first data log, I looked at the JDMMAP readings, and never touched the MBC. Left it right where it was, even though I told the owner I wanted to turn it down a little. His cars Duty cycles were very high, and I thought it was odd because on my car I was able to hit 23psi before my duty cycles were at 100% back before I replaced the injectors.
So, The fuel map. Same thing, made changes, and nothing changed. I ended up turning Lean Spool on, and keeping it on because when i disabled it the car seemed to generate a mind of it's own. It would follow an extremely lean fuel curve. For example, the data log showed at 3562rpm, 21.5psi, 241.8 load, 4* timing and 13.89 afr with no knock. Kind of hard to swallow.
So, after a retune, the car is now running very very low 12's to peak torque, then tapering to medium high (11.6-11.8) afr by redline. The reason I have it a tad on the high side is due to the area we tune at. There is water on both sides of the road, and it's slightly colder there with more humidity. Once back into town, the afr generally drops down about 0.1-0.15 point. Plus, as the weather get's warmer, it will slightly richen itself up too. But, I see the car all the time, and will log it from time to time just to see how it's doing.
So, here is what happend with the actual tuning. I had to set the High/Low Octane fuel maps exactly the same to get the car to respond to any of the changes I made. The wideband wasn't the problem, the car simply wasn't responding. Once I changed the hig's and Low's to be the same, the car acted as it should. Why is that? Once I was finished with the tuning, I made him a real Low Octane Map for obvious reasons, instead of doing the _ _ thing.
So, why was that? Why would a car only respond then I set both maps exactly the same? I am still a little perplexed by this..
It's was partially the wideband, and partially the car. To reiterate:
2006 IX 88590013 ROM with Cams, Intake, TBE, MBC..
After tuning, the car was maxed out at 100% duty at only 21.5psi of boost. From the first data log, I looked at the JDMMAP readings, and never touched the MBC. Left it right where it was, even though I told the owner I wanted to turn it down a little. His cars Duty cycles were very high, and I thought it was odd because on my car I was able to hit 23psi before my duty cycles were at 100% back before I replaced the injectors.
So, The fuel map. Same thing, made changes, and nothing changed. I ended up turning Lean Spool on, and keeping it on because when i disabled it the car seemed to generate a mind of it's own. It would follow an extremely lean fuel curve. For example, the data log showed at 3562rpm, 21.5psi, 241.8 load, 4* timing and 13.89 afr with no knock. Kind of hard to swallow.
So, after a retune, the car is now running very very low 12's to peak torque, then tapering to medium high (11.6-11.8) afr by redline. The reason I have it a tad on the high side is due to the area we tune at. There is water on both sides of the road, and it's slightly colder there with more humidity. Once back into town, the afr generally drops down about 0.1-0.15 point. Plus, as the weather get's warmer, it will slightly richen itself up too. But, I see the car all the time, and will log it from time to time just to see how it's doing.
So, here is what happend with the actual tuning. I had to set the High/Low Octane fuel maps exactly the same to get the car to respond to any of the changes I made. The wideband wasn't the problem, the car simply wasn't responding. Once I changed the hig's and Low's to be the same, the car acted as it should. Why is that? Once I was finished with the tuning, I made him a real Low Octane Map for obvious reasons, instead of doing the _ _ thing.
So, why was that? Why would a car only respond then I set both maps exactly the same? I am still a little perplexed by this..
Feb 6, 2008, 07:29 AM
#21
I couldn't get my AFRs any leaner than 12.0 from 6000rpm up. It got to a point where the fuel map was in the high 12's. As soon as I decreased the 19000 (rescaled) MAF smoothing value from 151 to 148 the AFR leaned right where it was supposed to (12.5) from 6K up.
Maybe temp comp and baro comp values tweaked it enough but the big thing is the MAF is fine tuned for the OEM intake system. Just to see if it will change anything to confirm that the lo oct has an input (like in your case) , and that it's not code, I will change mine to the same as well and see what happens.
Maybe temp comp and baro comp values tweaked it enough but the big thing is the MAF is fine tuned for the OEM intake system. Just to see if it will change anything to confirm that the lo oct has an input (like in your case) , and that it's not code, I will change mine to the same as well and see what happens.
Feb 6, 2008, 08:15 AM
#22
Have you seen tephra's thread about his 88590014 ROM? Might not be a coincidence.
https://www.evolutionm.net/forums/sh...d.php?t=322992
MB
https://www.evolutionm.net/forums/sh...d.php?t=322992
MB
Feb 6, 2008, 08:20 AM
#23
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Somthing else while I was daydreaming at work...
All the lean spool stuff, and when you turn it off the afr becomes more predictable.
I remember turing his off, and the afr was unresponsive to changes made in the fuel tables.
After turning it back on, it became responsive.
Any thoughts on that one?
All the lean spool stuff, and when you turn it off the afr becomes more predictable.
I remember turing his off, and the afr was unresponsive to changes made in the fuel tables.
After turning it back on, it became responsive.
Any thoughts on that one?
Feb 7, 2008, 11:52 AM
#26
It could be the MAF. Swap that MAF and see what happens. I had a similar experience tuning a car that was behaving like the one you are tuning.
I posted about it here:
http://www.socalevo.net/forum/index.php?topic=53117.0
Once i swapped the MAF on the car, all tuning gods smiled on me
I posted about it here:
http://www.socalevo.net/forum/index.php?topic=53117.0
Once i swapped the MAF on the car, all tuning gods smiled on me
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