SD tune problem

[wesam]

Hello there
i have a strange problem with this car
car is 2004 C5 M6
408 engine 11.2 CR
238-242 651-612 114 cam
80 lph simens deka injectors

I followed the Auto VE tutorial and its not the first time i tune an SD car
the problem that the car is not idling well and i could not make it richer than the values in the attached log file what ever i add fuel in the VE table it still lean and idled ruff
could some body look in to my tune file
Log_0020.efi

[BLK02WS6]

Something is up with your wideband... if you look at the log, where it is idling steady, the AFR dips on the wideband reading and the IBPW never changes - there is no fuel being added for it to dip like that... definitely not right....

[wesam]

SO its just a wide band issue ?
i will change the sensor
would you mind check my tune file if there is any idle things to be changed

thanks in advance

[BLK02WS6]

The VE is a mess, but I'm assuming you paste and multiplied in the erratic data from the wideband? Go back to the original VE and work on it again after you get the wideband figured out. Also, a lot is going to depend on your injector tables and whether you have good data in there... I don't have data for those particular injectors to compare... It will want some more timing in the idle areas with that cam...

[wesam]

I used the injectors spread sheet to calculate IFR table values
do you think those values are correct for 80 lbh ?
11.640625
11.710938
11.781250
11.859375
11.929688
12.000000
12.070313
12.140625
12.210938
12.273438
12.343750
12.414063
12.484375
12.546875
12.617188
12.687500
12.750000

also could you find any useful data from those injector data ?

http://siemensdeka.com/specsheets/FI114991cs.jpg

http://siemensdeka.com/specsheets/FI114991.jpg

[BLK02WS6]

Your injector flowrate looks better than it did before... minimum injector pulsewidth, default minimum injector pulsewidth, and injector pulsewidth voltage adjustment can all be found on the first document (although injector pulsewidth voltage adjustment will take some work to develop the table)...

[BLK02WS6]

I would try the attached injector tables - had to do some interpolation on that voltage table using what data they gave...

[BLK02WS6]

One thing I think is going to be a problem - I can't find a .cax file for this OS in order to get to B9021... that will probably effect the idle.

I saw a post from 2 years ago where you had the same problems with these same injectors...

[wesam]

Yes i had the same problem with those injectors when this engine was in my car
now its sold to the C5 owner but my idle was perfect nothing like what is happening in this car
i remember that i used a CAX but how could we make it work with this OS ?
is there any other compatible OS which will work with my car and the CAX file and how could i make sure ?

[BLK02WS6]

Post up on here in the appropriate area asking if anyone has a .cax for the C5 OS. I couldn't find one anywhere... without that, B9021 is not accessible and will be a problem. You might be able to change to another compatible OS (not the Z06) and get one that works - maybe the same year manual C5 - I would have to look at some tunes to see what OS they are and check the .cax that are available. Might be able to look around tonight. Will require totally hand working the tune...

Is the C5 forced induction? If not, why not get smaller injectors more appropriate for a naturally aspirated 408??