here ya go buddy. I got a car show to go to today so I got to go scrub on my car :\

i'd richen things up between 7500-8000 rpms... looks like the knock sensor may be pulling timing out on you

Yep - thanks. I noticed that also and added fuel there. Should make another log today with the changes. I wish I had help doing this... Dan?? :D

OK, I plotted your logs in my xls. Disregard the red dotted line, I use that because my CANScan has the old ROM chip in it, and it does not read the AFR correctly. I noticed that you have 99 as your throttle position... How the hell did you get that? I can only get mine to 78... Oh, well.

How was the car show?

I actually just programmed a 13.6/mad ignition advance map yesterday in 1 try...

I basically looked at the stock a/f ratio (~12.6) and my old 13.0 a/f ratio map - took the numbers in the cells, devided each by the new a/f ratio - stock a/f ratio for the rpms effected by that cell, then took that number and multiplied it by the wanted a/f ratio - stock a/f ratio (but capped it off at 50 if it was above) and it seemed to work beautifully...

in other words...

k = (emanage fuel #)/(a/f - stock a/f) .... per cell

and the new tune number = k * (wanted a/f - stock a/f)



so basically its just doing some linear interpolation...

That's it! I knew someone would figure it out... Awesome :D

I was looking to do only 13.2. How does your car run at 13.6?

oh it runs pretty damn good... :p

I don't think I did this right... I confused myself :o

How ignition adv?
k = (emanage fuel #)/(a/f - stock a/f) .... per cell
and the new tune number = k * (wanted a/f - stock a/f)

I got it :o

OK, I am going to run this tonight on the way home based on interpolation of my stock tune and my last cz tune. I'm tuning for 13.0 on this map. I want to stay safe until I know what I am doing better. When Maurice releases the new ROM chip for me, I will eliminate the red safe plot line. Here it is in case you are curious. I still have the timing zeroed out also. I also attached my stock AFR and my most recent CZ tune in case you are curious... Fingers crossed. ;)

You are going to trip fuel trims with all of the off throttle stuff in that map :)

Might want to delete everything below 40% throttle for now

Yep - I did after I posted that. Thought the same thing....

Wow, that's some serious fuel trim you've got at 7000 & 7400 rpm! Especially since the modd'ed intake & exhaust would tend to lean you out a bit anyway.

You're using the version of CanScan that sees the knock sensor?

What octane fuel are you running?

Thanks!

I am struggling really bad with this right now... I try and make changes to correct the map, and then all of the sudden something else is changing... Errrrgg. I just cannot seem to get the hang of this... :(

No - Standard issue, but it is getting a ROM chip upgrade soon.

92 Either Chevron or Shell.

Well, that didn't work out very well... I'm loading back an older map that I know is safe to use until I can figure this out. Look at those lean spikes! Yikes :eek:

Should I change the RPM Columns to a number that is on these areas that the engine goes lean naturally? It seems that the splikes are always between ranges, and getting the map to interpolate correctly is a pain.

Since you are not using the first few columns of your map, I'd re-scale and maximise your resolution. You might be able to tune those spikes then.

BTW, for what its worth, I have had lean areas much worse than that! I started with a map that was around 50% adjustment and had to work my way back to about 15% adjustment max. There was a lot of time spent with really lean areas in my AFR. No damage yet. I wouldn't be concerned about it. Of course, I eventually got it richened out, but it took a while. My point is that I doubt you have done any harm.

thats what i did for the spikes as well as pulling ignition advance away from the spikes since I never could tune them out completely

A note from Maurice about this curve:

"Adding .6 to the numbers is not a solution. It is nothing like a linear curve. Although that addition will keep you in the safe zone for the most part. Be careful around 6,600 to 6800rpm. N is a bit lean there from what I have seen so far. Your curve is not bad looking. Perhaps richen up a bit at the top around 7700-8000." CZ

So the .6 is staying until the new ROM chips are released, I think it is a good idea to "stay safe". I'll add more fuel at 7800 RPM and run this again today. Does this mean that all of you out there are tuning too lean because of the original CANScan's problem with reading the O2S1 sensor correctly? Or am I the only one? I'm going to tweak this map leaner until the CZ AFR reaches 13.1.

Okay. Educate me. We are all saying that 13.1-ish is "safe".... why? Its safe to run stoich at lower RPM, why is is not safe to do so above some magic threshold? We've probably all done it inadvertantly anyway. Is it a long-term concern? Obviously, the engine won't blow doing it occasionally. How is this more stressful than running boost?

I need the education :)

Until my CANScan can correctly read the O2 sensor, I'm not really sure where to tune for. Maybe that is another reason why some keep getting inconsistency in their logs. So, in the meantime, I'm shooting for 13.1. When the new chip and software is released, which is real soon, I will tune for more power.

It still looks to me that you are up against the knock sensor - I also have the N flash but have the ecu sending out 30 degrees of advance from 7000 rpms to redline and it looks like yours is bouncing around under 30 degrees.

Then again i could be just completely wrong... the more i think I understand things the more complicated they are :o

< the attachement is from 2 seperate runs >

I noticed that also... My timing map is all zeroed out completely also.

Well now MY CANScan quit working! I have tried everything to get it communicating again. The trials and tribulations of tuning with limited resources...

Timing adjustments made on the CZ unit will not show up on the CanScan...it will only tell you what the PCM is doing. You have to add the CZ value to the stock values to find out true timing advance. The PCM seems to pull timing based on Airflow......thats why the advance curve is not 30deg from about 7K up like on stock. Knock will also pull timing.....have yet to see that though :D