I did some datalogging this morning since I got my wideband installed. I have it running to my PowerFC through my FC Datalogit box and software. The wideband is a plx m-300.

Here's a link to a good third gear pull. I converted it to an HTML file so that I could post it up on my site at a good enough resolution to be able to read.

Please note the o2 readings that are highlighted in red and their corresponding RPM range. Is this too rich?

http://www.carrettiworld.net/Datalog_01.htm

I got rid of a couple of columns that had redundant numbers in them to make it a little smaller and easier to read.

Any knowledgable input would be greatly appreciated.

Thanks,

Tony

 

By the way, it won't read any lower than 10.0. The gauge face will go to "RICH" and the Datalogit will only read down to 10 in the text file.

 

a little off topic, but how do you interpret the boost readings? is the air temp connected? water temp?

my personal feeling is that 10.5 is as fat as one would ever go. 11.1 should be a good number, quick burn and still fairly rich. on the other hand, are you watching the knock? how do you interpret those numbers?

on the other hand I'm no guru. didn't even sleep in that fancy hotel.

 

I haven't figured out how to interpret the boost readings yet. I know that I'm set for a 1.45bar max and my boost gauge doesn't seem to be going over 21-22 lbs of boost then tapering. It has been converted to MAP sensor so it should be reading air temp. Water temp stayed at 86C.

Knock values are there and it only went to a maximum of 6 RARELY.

Anyone else using Datalogit?

Thanks,

Tony

 

i believe the boost readings are in kg/cm squared for the positive boost and mmhg for the vaccum. If so you are indeed running about a spike of 21 pounds tapering off to 19 and under.

 

By looking at this log, would it be safe to remove some fuel up top to bring me closer to 11:1? Also, should I take the fuel from the entire map or only where it starts to run rich.

Does anyone know how to do this with the FC Datalogit software? Any suggestions would be great. I'm not seeing hardly ANY knock at my current settings and I figure if I just remove a little fuel at a time until I start to see any knock I'm still on the safe side. Also, what does advancing timing do in relationship to knock and A/F?

Just trying to learn a little more about tuning.....

Thanks,

Tony

 

Yuo have pretty mild timing. I would add a degree or two and then start taking out fuel. YOu can go 11.5:1 safely and maybe a bit more depending on boost pressure, timing and EGT's.

 

pushing up the timing increases the chance of knock. leaning out the gas does the same.

when the spark fires too soon there is a chance part of the burn will erupt out of sequence.
follow Guru's advice, although you could fix the fuel and then add some timing.

 

Now to figure out if I need to reduce fuel globally or just in specific cells.........

 

specific cells always. Globally only if you upgraded the injectors.

 

Actually you should take it out in all the higher boost cells carefully as the numbers need to be smooth. YOu can't have a huge jump in the cells compared to the ones around them.