2002 - 2004 genIII

[Aussie Mike]

I believe the smog check in the US means plugging in to the OBD2 port and seeing if there are any emissions related trouble codes.

Probably wouldn't have passed the tail pipe sniffer with that cam in it.

Here's some usefull ECU identification info:

1999-2002 PCM
Running a 32bit Motorola Microprocessor
Flash capacity is 4Mbit (512K).
PCM HDW numbers are either 16220610 (1999-2000) or 09386530 (2001+).

2003-2004 PCM
Updated Microprocessor but is still very similar to the 1999-2002 PCM.
Flash capacity is 8Mbit (1Mb).
From the outside it looks the same as the 1999-2002 PCM except instead of a Red connector it is Green.
PCM HDW numbers could be one of the following -
12570558, 12580786, 12583659, 12583660, 12589161 or 12589162.
Note: Some of these PCM's are not interchangable between vehicle applications.

2005 LS2 ECM
LS2 ECM is known as the E40.
Has an upgraded CPU and is a completely different animal to the previous units with different connectors. This ECU also no longer does the transmission control.

Cheers

[Tenrocca]

From my little bit of research, the first model to comply with ADR 79/00 (which applies to all new models from 2003 and ALL new cars sold from 2004) was the VY series II which was launched in August 2003. This is the important thing I think - an engine that can be proven to meet this ADR - as this is the one that takes us up to the end of 2007 with the 3 yr grace period.

So does that mean the only difference between the series 1 VY and series 2 VY was the tune to meet the new ADR? Holden specs state power went from 220 to 245 kW with the S2.

[Plums]

The VY series had a claimed 235kW and VYII had 245kW (this only applies to SS variants, as the Berlina and Calais had more restrictive exhausts).

In my experience, if you strapped a dead stock VY SS to the rollers it would make around 185kW's, where a VYII SS would only make a max of 180 (usually high 170's). The VYII runs HEAPS richer at WOT which kills power. I know it doesn't make sense but I have seen it time and time again.

The VYII does have a different cam profile to the VY engines (though only slightly). The programs for each are similar, but there are some differences. Most VYII programs don't have the lean cruise function enabled (though some do), they are much richer in PE mode (power enrichment), and the VE tables are quite different.

When either of these models is fitted with a decent exhaust and some intake mods, MAFLess tuned they will make pretty much the same power.