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[elvin315]

Have you given thought to the 4xG Cam mod?

http://www.omegaowners.com/forum/index.php?topic=126532.0

[Kevin Wood]

Ignition  no issue as the knock control will compensate.

ECU wont notice, the compression ratio was only lowered to reduce cylinder temperatures and hence NOx generation allowing removal of the EGR valve.

Oh is see. But how very disappointing.

Makes it somewhat tricky to remove factory "fitted"  gubbins that purely exist to meet EU/emissions  regs. On a bike it's just re mapped with a filter(but not these days) and free flowing exhaust and bingo, an as Mr Honda/Yamaha/Kawasaki/Suzuki intended engine is ready to go. No flat spots or overly safe fuel fuel mixture. Just crisp throttle response and a few more bhp.

....and this is all because of cold starting?

No.. Nothing to do with cold start. Probably more because it was cheaper for GM to reduce the compression and increase the displacement a little than to fit EGR to the engine.

[Marks DTM Calib]

Have you given thought to the 4xG Cam mod?

http://www.omegaowners.com/forum/index.php?topic=126532.0

2 off G cams on the inlet is a good approach, might as well use the A's for the exhaust as there is little to be gained with the exhaust cams being upgraded. 

[minifreek]

I fitted the 4 x G cams to my 2.5, along with the 3.0 divider and fitted the long nose plenum from the 3.0 also.

With just the g cams fitted, there was a noticeable loss in low end torque, but once the cams switch on they do make good power.

I fitted the long nose plenum to get some of the low end torque back, and it has worked. there is noticeable gains to be had from fitting the 4 x g cams, but they also need to be fitted with the other 'mods' also to get noticeable gains from actually fitting them...

My omega was RR'd at A&M Conversions in Sealand, Deeside... who are Vauxhall tuning specialists. The operator couldn't get the true power from the engine but in his experience was confident that my engine and combinations of other things fitted, is producing 235BHP, which Im quite happy with. He did say that the gasflowed Vectra Challenge heads have helped also...

[elvin315]

Have you given thought to the 4xG Cam mod?

http://www.omegaowners.com/forum/index.php?topic=126532.0

2 off G cams on the inlet is a good approach, might as well use the A's for the exhaust as there is little to be gained  with the exhaust cams being upgraded. 

What do you mean by 2 off G cams? I thought using the G cams as both intake and exhaust was the hot ticket.

[deviator]

4 G cams will give BHP. The A cams seem to offer more torque and the J cams make great door wedges.