E-mail sent!!

 

John tell me how to disable the EGR please. On my 1G DSM I just used a block off plate and I'm guessing that this would not work on the evo right?

 

a quick question: will lowering the open loop load values 2k-4.5k to 40 cause the fuel trims not to adjust as much? my high (evoscan) trim is good on at 100% +/- 5% but my mid trim is only about 80% and hasn't changed much more then 1 or 2% I was currently getting my tune back to 92 oct from E85 and reinstalled my stock injectors. should I reset my open loop load map values back to stock for a few days to see if my mid trim raises?
It has been about 3 tanks of 92 since I switched and my trims were slowing lowering before I started playing with my open loop load maps.
thanks,
ed

 

Block off plate and then its a matter of using an ECU periphery change to keep the CEL from coming on.

 

Okay I know how to use the block off plate. Can you point me in the direction or link of the ECU change since I haven't tried anything along those lines except basic ecuflash stuff.

 

bump

 

I will need to recheck the binary to make sure it disables it, but the ECU periphery is "FCA". The stock value will be EFDF and this needs changed to 8D89 (enter it as 0x8D89).

So basically- add a new map with FCA as the address like in this thread:

http://www.aktivematrix.com/forum/viewtopic.php?t=346

 

bump for updates

 

Here is an update. I can't get this method to work on my car I have set the maps to 45 (with 40 @ 3000 and 3500 rpm) and I still cannot get a consistent AFR.

Anything below 3000 rp and 65 mph gives me 15.2:1 AFR. But anything above 65 mph and 3000 rpm reverts back to 14.7:1.

So now I am trying a different aproach. I disconnected the O2 sensor and kept the heater wire connected. Then I took a wire from the analog port on my LM-1 and connected it to the plug wire on the ECU that gets a signal from the NBO2 sensor. I made the LM-1 sensd a signal to the ECU to allow an AFR of 15.2:1 during idle and during cruise.

It worked, but I would rather do it the way the rest of you are doing it. I have no idea why the Rom method is not working on my car.

 

Hasn't worked on my car either. I get inconsistent AFR readings even at ~50 load points and anywhere from 3-4k it sometimes hits ~15.8 and sometimes goes as low as 14.0. I am currently not messing with it as everything I've tried as well as figures you guys have posted, tend not to be consistent and am going to await further testing.

 

I think I might do the same thing, I made even less significant changes to the High Octane Fuel map and got AFR's in the 15.9 area, and it was inconsistent too as far as i could tell too...maybe a EGT gauge would be good to see what the temps are doing when running this lean, no?

 

Have you tried increasing the open loop throttle voltage? isn't that a switch over point from closed loop to open loop. maybe when u go above 65mph, you exceed that throttle point.

 

So I drove to and from Buttonwillow this week for the super street time attack we where competing in.

Did some playing around with the open-loop stuff more because it's 200 miles+ each way on the long, straight boring *** california Hwy 5.

I have both open-loop tables set to 40 from 2500 to 3500 rpm.

On the way down, if I was under 3000 rpm, which was about 65mph or so in 6th gear my afr was a nice 15.1-15.3. With pretty much the same throttle input and above 3,000 rpm, the AFR would drop to 14.3-14.5. This would be when I was maintaining 70+ mph.

Now, at that same speed, with the 14.3-14.5 AFR, if I gave it a little bit more throttle, it would go back up to 15.1-15.3

I took a look at the open loop throttle tables. In my 96940011 ROM, open loop throttle Low load is:

3.00781
3.00781
3.00781
3.00781
3.00781
3.00781
3.00781
2.5
1.83594
1.875
1.89453
1.81641
1.79688
1.77734
1.71875

(from 500 to 6000 rpm, in volts according to the def)

open loop throttle High load is:

3.00781
3.00781
3.00781
3.00781
3.00781
3.00781
3.00781
2.5
1.79688
1.81641
1.81641
1.77734
1.73828
1.73828
1.69922
0

I noticed the Evo 9 88590015 rom is in Percentage, not volts and looks like this low:

105.625
105.625
105.625
105.625
105.625
105.625
105.625
80
56.875
56.875
56.875
56.25
56.25
55
54.375
0

and High:

96.25
96.25
96.25
96.25
96.25
96.25
96.25
80
57.5
58.125
58.125
56.875
55.625
55.625
54.375
0

---------------

Either way, it seems like more volts in my rom would = more throttle right? but the thing that confuses me is that my rom has 3.01v for 500 to 3500 rpm, so why would 2500-3000 rpm make such a difference and drop from 15.2 to 14.3 until I give I a little more throttle?

When I get some more time I am going to mess with the open loop throttle tables and set the 3000-3500 rpm area to less volts and see if that works.

FYI, even with this silliness, I managed 24.5 mpg on the way back up from buttonwillow raceway. Not too shabby but I think it could be better if I could get the car to stop dropping down to a rich 14.3 AFR.

 

So I did all of the above modifications to my car over the last few days, making sure to watch the wideband under highway cruise as well as city driving. It seems to be working under most circumstances, but I do have a few questions:

1. I started my open loop load values at 500rpm's. Reason being, I wanted to see if I can get the car to idle around 15.2-15.6. Is this OK for an idle afr value? Seems as though with my turbo timer and how I like to let the car warm up a little before I drive it, I could save a lot of gas doing this as well.

2. Is 15.7 a little high of an AFR value for cruise? What afr value should I really be shooting for under highway cruise conditions?

3. Seems as though my car's load values are less than the norm. My car likes to idle in the very low 20's, high teens sometimes. I had to set my highway cruise load values to 30 to get this to work, less than the "norm" values in the 40's. Maybe my car us uber efficient and my open loop start load values have to be a little lower than normal?

I am going to data log everything on my ride home tonight, and do about a 10-15 mile excursion on the highway to verify its operation, and verify load values. Any input on this would be greatly appreciated. Hopefully answers to my questions might help a few others as well.

 

tkklemann, any results from you logging excursion? I finally started testing this weekend and noticed that even at 30 load setting, I only get the desired 15.4 when I give the car slight throttle on the interstate. At normal cruise of 70-80 mph then it is 14.7. I am starting to wonder if it is using a throttle sensor.