But ill be able to see if the injectors are being maxed out?

 

I have a manual as opposed to an auto. I also don't have headers(stock exhaust manifolds and cats)....but my 1/8 mile trap speed with the CC503 is 84mph. That points to something really wrong in my book. That speed is also at a slow track. I have not been to Piedmont to test n tune yet....just Farmington. My speed below is from Piedmont when I was just intake and exhaust. I picked up 4mph from before the cam to after at Farmington...so my trap speed at Piedmont may be around 87mph. Just trying to give you an idea of how far the car is off on hp(not that you don't already know).

 

That would be the duty cycle.

 

Is there a duty cycle on freescan? because i can not seem to find it on there.

 

I don't recall seeing it in the FreeScan data logs that people have sent me for review. Its actually pretty easy to calculate:

DC = (Pulse Width x RPM) / 120,000

Example... say you have an 18 millisecond pulse width, at 6,000 RPM

DC = (18 x 6,000) / 120,000 = (108,000) / 120,000 = 0.90 = 90% DC

Or if you don't want to convert from decimal to whole numbers for DC:

DC = (Pulse Width x RPM) / 1,200

 

Well I finally got a chance to datalog my car and this what I got. Not sure if I did this right it hat my 1st time doing this. Any help would be great.
Both runs were done on the street with street tires.

IDK how to upload on this site so here is the link to the other site where I upload it to.

http://www.ls1tech.com/forums/lt1-lt...l#post13662381

 

My ignition timing at WOT is 34-37* with only 1.5* of knock. Mine starts around 34* at the start of WOT and advances up to a high of 37* at the end of my WOT run. Your timing starts high then is pulled down( you start at 36* then it's pulled down to 31-32*....could be that 4* of knock...not sure). That may explain why you feel strong out of the hole and then it falls on it's face. As to why....I'm not sure. Will have to wait on the others to chime in.

At any point, did you take out the knock sensor? If so, when you put it back in, did you torque it to the recommended spec(and use thread sealer...ie permatex high temp thread sealant)? If you tightened it too tight, I've read that can cause false knock issues and or damage the sensor.

 

Thanks for taking a look. But no i've never take the knock senor out before. Anyone else know whats going on and why?

 

Just another note. Looks like, at times, you are hitting 90% DC on the injectors. I have red topped SVO's(30#) and the highest DC in my logs is around 65-70%.

 

Where on the datalog did you see the rate of the injectors?
Anyone else have anything to say about my car?

 

Right side of the engine doesn't seem to be in closed loop. O2 sensor is stuck in the 800mV range (moves only a little, although it does drop on closed throttle fuel cut), the BLM is stuck at 128 except for 2 records, and the INT is stuck at 128.

The timing drops from 38* to 34* because the 4* of retard is being subtracted from it.

The duty cycle isn't part of the data... you have to calculate it the way I told you. You need to set your system up to produce the data log in .csv format.... PITA to play with the .txt file and put it in Excel format.

Once you are in Excel, insert a column next to the base pulse width-left, and enter the formula I gave you (PW-L from that line of data X RPM from that line of data)/120,000. Copy it into all the cells in that column. Do the same with base pulse width-right.

 

Ok yea your right i forgot about that when it comes to the injectors. Which O2 sensor are you talking about?...driverside? Also what does BLM stand for?

 

Right side = Bank 2 = passenger side = cylinders #2/4/6/8

Are you looking at your data log? It shows "BLM Right". BLM = Block Learn Multiplier = long term fuel correction. This is what the PCM "learns" based on O2 sensor feedback. This is how the PCM changes the injector pulse width, if the O2 sensor indicates that bank of the engine is runnig rich or lean.

Might want to browse through this:

http://www.injuneer.com/ScanMast.html

 

Just like Injuneer said.....I did some quick calculations where I saw your pulse widths and rpms the highest. I do have your file in excel. If I get time tonight, I'll try and do what Injuneer mentioned above and post it in excel format to my webspace. I'll post up a link later tonight.

 

http://www.ace1252.com/Excel_Car2_1_Log.xls

I put the duty cycle columns next to the injector pulse widths.

LOL, guess I could have done some rounding on the formatting.