Nistune Forums

Hey Matt, I ran through some ca18 code finally, the ignition advance routine, kind of interesting. It would seem to me that there is a 16 point table at 3B20 that is, at least at certain times, used for coolant based timing advance correction. Also as far as I can tell the ecu only really uses the f...

Back to original Q - how is inj. time calculated? On my CA18 it changes rapidly by as much as 2 times in certain areas of fuel map Confused Of course my AFR doesn't do that in reality This would be somewhat of a difficult question to immediately answer. Final injection time calculation is very cryp...

Also, I forgot to mention. There is probably a coolant temperature correction applied to final timing advance. What this will do is add or subtract from the timing advance value, after it has been picked from the table. I have seen eccs code make use of 2 seperate 16 point coolant temp correction sc...

You may want to modify the code's table pointers so that only one timing advance table is used. This will both solve this potential issue and make tuning easier as you will only have one functional table to deal with. I like to do this with the fuel correction tables as well. All that you need to do...

The reason I mentioned TPS is that you are probably going to want to incorporate some sort of acceleration compensation to your output signal, using this variable. The nissan MAF does a lot of the work when it comes to ECCS acceleration compensation, it has very quick update. A map sensor will take ...

Just out of curiosity , which ecu do you run ? 16 bit sr20 type? An external micro could do it, you would just be emulating MAF voltage instead of Q itself. You will need to use MAP (2 for baro correction), RPM, IAT, and maybe even TPS in your algorithm. You can tap into the 1 degree (or 2 degree de...

No rush Matt, I am still trying to get a reliable 5v ADC reference out to the harness for the map sensor. Up until now I have just been accepting the drift error, but it needs to be referenced properly for practical use. I havent yet compared readings over different temperatures and battery voltages...

Maybe this will give you some ideas for MAP sensor conversion.

http://eccs.hybridka.com/viewtopic.php?t=358

My only comment F3600, judging only by the screen shot, is that your ecu is configured very well. Your K number would seem to be set just about perfectly, and your A/F targets are good both ecu-configuration wise and appropriate for respective area. What does it idle at exactly? AF 15-17:1? or 14:1?...

Test these things, Battery voltage with engine off (DC,measure at posts) Battery voltage (DC) with engine running, idle Battery voltage (AC) with engine running, idle Then note/compare to measurement at ECU terminals. Do you notice any gauge panel or other electrical anomalies? This data would help ...

Install the latest version of the Nistune software, it is constantly being updated. I assume the 60 day expiration is to keep users up to date, and probably to help discourage hackers. You will keep your current .bin file (contains all of your modifications, maps etc.). If your previous .adr file do...

It seems that in the latest version 0.90119 with the new extended gauge option, that the IAT (intake air temp) gauge is not operating. Consult doesnt hang, and the gauge pops up ok, but without data output on the needle or label. Data translation and location in consult table is per consult docs. Ve...

Moates ostrich support works great!

When it is finished updating the .bin it asks for consult reconnect, but overall very smooth, nice work Matt!

I think I meant 6802, and not 6303 above, but all still applies. About the diagnostic potentiometer, I think that uses the AD (46508/10), but seems to be set up on a pin as a comparator on my ecu's and not an ADC. It could probably be reconfigured, but I wouldnt want to try it. Maybe with the hd4651...

What ecu is in question here, the Z31? Does anyone happen to have a basic correct (dis).ASM for this ? For the outputs, first you need to map out the 6303's port pins to the original outputs. Surely there are a couple emissions related solenoids on the engine that would use a switching transistor on...