Matt on vacation 9 Jan - 20 Jan... and an update

Matt · Post by **Matt** » Tue Jan 06, 2009 1:05 am

Just letting everyone know that i'm going on a boat for this period of time... so no email etc!

What am I working on in the meantime.... well I've had a few reports of timing not working as expected under 65 degC and 80 degC. Seeems to happen on Z31, HCR32, BNR32, Z32, J30 VG30E etc

So I'm looking into various ECUs and seeing what Nissan is doing instead of reading the timing map at those temps. Sometimes other tables are used, and I think in some cases hard coded values also used

Results in timing stuck at between 10-20deg BDTC when cold then all good when warmed up. Would like to fix that or at least find out what Nissan is doing there... so research continues

Also another report is that over fueling is occurring with larger injectors on the SR20s. Seems that the injector ms reported from consult is rising quite quickly when AFM increases. I'm looking into the cause of this, because if affects bigger injector setups (800CC) more and causes it to go richer than it should on acceleration

Also fixing up address files where there are problems and making updates to include more parameters (and verifying with hardware tracing with single+dual emulators)

So I'm focusing on the main tuning parts (bread and butter bits of the system) before going back to knock detect work

Attached is some of what I'm working on for diagnosis when tuning and what to look for. Its very draft and more to come...

MichaS14a · Post by **MichaS14a** » Tue Jan 06, 2009 2:00 am

Very nice document (even in this state)!

One thing about logging is strange:
- If I log in tuner mode there is always a map-trace in every map (live and also in playback mode).
- If I log in stream mode there isn't a map-trace anyways. Not in live mode and not in playback mode.
Do I something wrong?
I can give you samples from a S14 (early version) if this helps.

I whish you happy holidays!

Matt · Post by **Matt** » Thu Jan 08, 2009 3:25 pm

thanks

okay i'll have to have a look at the stream mode and see whats going on

some more notes I found last night (not documented yet)

there is a window (TP/RPM) in the timing maps which is used <65degC which then uses a separate timing table

this is what is causing massive timing pullbacks when cold on a few ECUs (so far Z31, Z32, BNR32 and HCR32 reported with this). but each ECU works differently so I have to go through and document each one

i will need to add parameters for the trigger temperature as well as RPM/TP values which are reached, in addition to this table.

other ECUs may have different conditions and more tables (eg Z32)