Sunday, October 30, 2005

Base OS upgrade

Lots of reading and scanning this week. I noticed that Engine Coolant Temperature wasnt being measured in the default PID's, it would stay at -40C. Weird, no codes where thrown so I guessed it must have been ok. In addition it was shown ok using the bidirectional controls for idle. I noticed it was set at priority 3, so bumped it up to 1 and low and behold it came to life and now works ok in the scanner. Cool.

My LTFT's were all +10 in the higher ranges, so certainly room for improvement there. Im tempted by an EFILIVE custom OS as it allows dual spark maps and octane/spark scaling dynamically in SpeedDensity (MAFLESS) mode. Only issue is that the OS doesn't support any calibrations from PCM's before 2001. So I downloaded from this excellent Holden Pcm site a stock 2003 Manual R8 Clubsport PCM OS image and Calibrations. After firing up the stock 2000 tune and the 2003 one to compare I noticed not much had changed. There was some alterations higher in the RPM range to the Volumetric Efficiency (VE) table, but nothing stellar, certainly not compared to the GTS tune. There are numbers well over 100 in there. All looked well with the main action required to copy the fuel injector flow rate table over. The 2003 model injectors appear to flow around 10% more. I think from memory 2000 are 26lb/hr and the later years 28lb/hr or there abouts. I guess Ill need to keep an eye on duty cycles, which coincidentally were also not reading accurately. I might have to fiddle about with the scanner to get them reading ok. Again no DTC codes are thrown and the car drives ok so I guess its down to the scanner PID settings.

It was then with a little trepidation that I fired up the tuner and ran a test flash. Some nice warnings about isolating the Class-2 network from the PCM, which I duly accepted and the test worked fine. I ran it again and it went in fine, a power cycle of at least 15sec and then everything fired up 100% no codes or anything, a drive around the block and all is well. I couldnt say I noticed any more power unlike the cleaner air filter, but it seemed a little "fuller" at lower revs, less peaky. I can now mess around the the PCM and know that my tuning can be transferred to the later PCM. Its kind of tempting now to throw a 285KW HSV tune in, which should definately give a little more power, but that will just delay the proper tuning process. Next step Speed Density mode and VE table tuning. Winter is approaching so I need to get my Wideband in while I still can. Being in London the only place to do this is on the driveway!

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