CZ Tuning Q&A
 

Hopefully this will be the thread where we can park our questions and answers about tuning the eManage/CZ

Question 1:
Are we sure that positive values are taking away fuel (thereby raising the AFR)? From all the data I have taken so far I see my AFR decrease as I input higher and higher values. Without CZ I am running approximately 12.8 AFR and with the CZ I am running approximately 12.4.

Question 2:
Should I take any efforts to lean out the 7800 to 8500 RPM range? Should I keep it rich, maybe to protect the engine?

Question 3:
Is there a reason why there wasn't any adjustments to the fuel map below 40% throttle? Is there any advantage in tuning throughout the whole throttle range?

My own question is how is everybody logging and then correlating the info? Are you bothering with logging anything in the emanage software or only using the Canscan? and if so, what values are you logging? I have an idea but I think I am grabbing way to much data I dont need and am slowing down the sample speed, causing some wonky values, but I aint 100% sure what to cut out.

If you have the CanScan tool you should log the following parameters: engine RPM, speed (optional), ignition advance, throttle position, O2S1 sensor, elapsed time.
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Kitchen Measures

I haven't logged any data from the eManage. I figure AFR is what I need to tune to anyways. I guess to answer my own questions I should at least look at the MAF voltages to see if there is any effect.


Genom, here is what I usually do.
1. I log RPM, Ignition Advance, Throttle Position, O2S1 (AFR), Speed. Time will be automatically logged, so input required

2. I usually try to do WOT or near WOT (70%+ Throttle Position) pulls in 2nd and 3rd gear. On public roads I find 2nd gear pulls easier to do.

3. I try to get a couple of pulls in the same to get some sense of repeatability in the measurement.

4. I filter through my data and only pick out 4000 to 8000+ runs.

5. My plots generally looks like the plot in the attached document.

6. For comparison between different runs I usually either try to picks points that are close (e.g. AFR reading at 6154 RPM for run1 vs. AFR reading at 6287 RPM for run2) or I interpolate to a specific RPM such as 6500, 7000, 7500, 8000.

are the rpm's full scale or half scale in the CZ units???

Log: RPM, Ignition Adv, O2S1, Rel. Throttle Pos.
Runs: WOT 1-2-3, 2nd gear WOT, 3rd gear WOT, normal 1-2-3-4-5-6 run

Microsoft Excel is your friend here.

prober: they are half RPM unless youve had the unit changed to full RPM. Mine is, and it's a pretty easy setup, as long as you get that final vital step that was never posted anywhere :D (move the RPM cable from it's original spot to the new one).

Which ....same as the RPM pinout? Do you have a picture of your daughterboard?

I have modified my unit and want to go to full maps

I have the info for the old style ignition board with the blue DIP switch package. Whoever wants it, send me a PM with yer email and I'll toss it your way. But it's pretty easy. Basically if you look at the large connector on the emanage, if you look at it from the end the conector is on, the 3rd cable on the bottom row from right to left is a brown wire. Find that on your circuit board and move it to the full RPM output pin.


***** IMPORTANT: Dont forget to load a full RPM map then before you start the car!

Is there an important reason why CZ put it on half-RPM setting? Also, if someone does this all they have to do is change the scaling in the Maps they have to fit a full-scale RPM right?

i think it's a left over from when stage 1 was just stage 1, and couldnt be tuned.

hmm... how much does the a/f ratio on average go up for a map change of 5 or 10??

It depends I find that 10 has a pretty significant change at 7000 and below. Above 7000 you really need some big changes to see any shifts in AFR. I'm at +40% and I'm close to my target of 13.5.


Anyone know if the CZis limited to +/- 50% on the AFR map? Can I go beyond +50%? The eManage says it's limited to +/-50%, I really hope that's not the case because I starting to hit that ceiling and I haven't even hit my target 13.5 AFR

I am getting the same thing. Right now I'm running below 12.05:1 AFR above 8000 rpm. I'm at +43 and still below 12.05. I tried resetting the ECU and having it relearn with the maps I have in there. What I'm worried about is if the ECU will learn out an nullify the adjustments that are in the CZ unit.

Try recalibrating the throttle setting. It really helps. I had probelms with the engine responding to changes prior to the throttle recalibration. Also try to log the MAF changes from the eManage to be sure that the eManage is changing the MAF voltages

The timing advance looks fine over 5000 rpm but what is going on below it? I like to see about 25-26 degrees advance by at least 3500 rpm. I understand it changing with throttle position and under a lighter load I like to see it higher. It looks like you are at about full throttle by 3500 rpm or so but the timing advance only looks like about 10 degrees at that point. Too bad we can't see the timing split between the leading and trailing plugs. That's where the real magic of rotary tuning is. They need to stay about 10 degrees apart at all times for the best power and safety. If it stays 10 degrees apart, you can't detonate if the timing is advanced too much. You'll just lose power.

Do you have the ability to log both leading and trailing timing? I'd like to see it.

I don't know if its possible. I don't see it as an option on the Canscan. Will have to check with CZ or Dan Harrison.

That would be something very worthwhile to find out as it is very important. The stock ecu has seperate timing maps for the leading and the trailing ignition. Which one it chooses is based upon what loads/rpm the engine is at. It doesn't necessarily use the same leading map with the same trailing map in all cases. This makes aftermarket tuning even stranger.

Definitely find out if there is a way to log it. it is one of the most important things to know on a rotary.

Any word on the trailing timing yet? No one ever seems able to answer this one. Without knowing this, it is hard to tune at all.

Dan Harrison is really good with replying to queries. I suggest someone knowledgeable about this trailing spark monitor should ask him about it.