Issues with starting after K changes
Posted: Thu Nov 03, 2011 4:33 pm
Hi All,
Im not new to Nistune but I am new to this paticular problem, so thought I would throw it up here and see if anyone can advise or relate.
Basically, had a bloke come round last night for a Nistune type 3 install into a redtop s13 50F00 ECU. The engine was running 850cc SARD's, a Z32, HKS GTRS and numerous other engine mods.
Upon installation, I found the ECU already had a daughterboard installed, which was VERY similar to a Nistune type 4 board (Had 2 x EEPROM's, 1 odd 1 even & what I can only assume is a multiplexer, I took pics of it if anyone is interested, its actually made by a company in Japan called GT WORKS http://www.gtworks.net/) so I removed this board and fit the type 3, CJ1 swap was already done for me.
Plugged the ecu back in, connected via Nistune no problem, sync'd the 50F00 map up to the ECU and then resized the INJ to 850cc, adjusted INJ dead time to 760ns and changed AFM to a Z32. Straight away the engine would not start, sounded totally dead like the coilpacks were disconnected.
Then I re-loaded the 50F00 map back into Nistune, re-sync'd the totally stock map up to the ECU and tried to start it without resizing INJ or changing AFM, and it started almost immeadiatly, but ran rough as guts (as expected).
I then shut the motor back off, resized AFM to Z32 and started her up again, ran much smoother but was seeing 10:1 AFR's at Idle (again, to be expected at this point).
I then shut it off, resized INJ to 850cc (which is K of around 17000) and adjusted INJ dead time to 760ns. And just like before, straight up, no engine life, wouldnt even so much as cough.
Then I tried different INJ dead times, tried stock (550), 600, 650, 700 etc etc and no luck. Just to get it to start again I had to reload the 50F00 map back into nistune and re-sync, resize AFM before it would even fire up.
The best I managed to get it to was resized for 550cc, INJ dead time set at 760 (which is correct figure for SARD 850's) and Z32 AFM. It would drive pretty well at this setting and more importantly would actually start, but idle & cruise AFR's were around the 12.5:1 mark. At these settings, I was seeing a K const of around 24000.
Literally, the minute I changed it below that figure, the car would continue to run, AFR's would stabilise around 14-15:1 but AS SOON as I shut the engine off, it would not start again.
This had & has me pretty stumped... started to think perhaps GT Works had modified some other areas of the ECU (ie hardware mods) and that might be playing silly buggers with Nistune but really im stabbing in the dark here.
Any ideas?
PS, hope this makes sense, feel free to ask me to clarify
Cheers,
Hayden
Im not new to Nistune but I am new to this paticular problem, so thought I would throw it up here and see if anyone can advise or relate.
Basically, had a bloke come round last night for a Nistune type 3 install into a redtop s13 50F00 ECU. The engine was running 850cc SARD's, a Z32, HKS GTRS and numerous other engine mods.
Upon installation, I found the ECU already had a daughterboard installed, which was VERY similar to a Nistune type 4 board (Had 2 x EEPROM's, 1 odd 1 even & what I can only assume is a multiplexer, I took pics of it if anyone is interested, its actually made by a company in Japan called GT WORKS http://www.gtworks.net/) so I removed this board and fit the type 3, CJ1 swap was already done for me.
Plugged the ecu back in, connected via Nistune no problem, sync'd the 50F00 map up to the ECU and then resized the INJ to 850cc, adjusted INJ dead time to 760ns and changed AFM to a Z32. Straight away the engine would not start, sounded totally dead like the coilpacks were disconnected.
Then I re-loaded the 50F00 map back into Nistune, re-sync'd the totally stock map up to the ECU and tried to start it without resizing INJ or changing AFM, and it started almost immeadiatly, but ran rough as guts (as expected).
I then shut the motor back off, resized AFM to Z32 and started her up again, ran much smoother but was seeing 10:1 AFR's at Idle (again, to be expected at this point).
I then shut it off, resized INJ to 850cc (which is K of around 17000) and adjusted INJ dead time to 760ns. And just like before, straight up, no engine life, wouldnt even so much as cough.
Then I tried different INJ dead times, tried stock (550), 600, 650, 700 etc etc and no luck. Just to get it to start again I had to reload the 50F00 map back into nistune and re-sync, resize AFM before it would even fire up.
The best I managed to get it to was resized for 550cc, INJ dead time set at 760 (which is correct figure for SARD 850's) and Z32 AFM. It would drive pretty well at this setting and more importantly would actually start, but idle & cruise AFR's were around the 12.5:1 mark. At these settings, I was seeing a K const of around 24000.
Literally, the minute I changed it below that figure, the car would continue to run, AFR's would stabilise around 14-15:1 but AS SOON as I shut the engine off, it would not start again.
This had & has me pretty stumped... started to think perhaps GT Works had modified some other areas of the ECU (ie hardware mods) and that might be playing silly buggers with Nistune but really im stabbing in the dark here.
Any ideas?
PS, hope this makes sense, feel free to ask me to clarify
Cheers,
Hayden