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[flyer 0712]

Well it is amazing what we can find out on here just by reading the facts about different things....very interesting and informative..

[humbucker]

"For the standard engine setup"

That's it I guess. As part of an overall modification and performance enhancement package they have their place, but on their own probably add little effect to a car like the Omega. That said, a K&N panel filter made a notable difference on my C25XE-equipped Cavalier, and that's essentially the same lump as found on the large barge (albeit with a different air intake system etc). I won't mention the effect on my Cavalier Turbos, hehe

It is true that some 'purists' are very quick to dismiss any form of Omega fettling without actually playing about/finding out for themselves. At the end of the day, what's the worst that can happen? "Oh, it didn't work". And? Nothing wrong with trying these things. I see a lot of criticism when members pipe up about trying something new, and it's usually from those who have entirely standard cars (maybe modification extends to the application of a towbar ) and are simply quoting other's posts under the assumption that they are regurgitating the gospel truth. While there's merit in drawing on the experience of others, it's also important to remember that there's nowt wrong with experimenting and playing about. It's only nuts and bolts at the end of the day.

[05omegav6]

Re the trumpets, prior to removal, there is evidence of the airflow through the filter being concentrated in a 3" area. Ever wondered why it's only dirty in one spot?

Remove the trumpets and this no longer happens, which would suggest that air is passing through the whole filter. Whether this is better or not I couldn't say. Might make the airflow more turbulent after the filter

[Marks DTM Calib]

Re the trumpets, prior to removal, there is evidence of the airflow through the filter being concentrated in a 3" area. Ever wondered why it's only dirty in one spot?

Remove the trumpets and this no longer happens, which would suggest that air is passing through the whole filter. Whether this is better or not I couldn't say. Might make the airflow more turbulent after the filter

What you have to consider is that air has mass and consequently does not like to go around sharp corners. In fact, a sharp edge has the effect of creating turbulance which results in an effective narrowing (for air flow) of the apeture.

Hence why a trumpet is fitted with a radiused turn and slight narrwoing to speed the airflow slightly and then slowly encourage the air to 'spread' without creating the turbulance, the harsh edge is then out of the main airflow.

The same is true of the air passing through the filter, it will always try to pass through the centre due to the position of the outlet .....passing through the outer edge requires the air to travel further....which it will as the filter bungs up (but will generaly bung from the centre out).

Any way, thats probably getting a bit complex and needs very advanced computer sims to model effectively (and even then they tend to be best guess) but hopefuly gives an insight into what you have to consider when thinking air flow.

Plus of course, its the exhaust manifolds on the omega V6 that are the big compromise as we know. 

[05omegav6]

Do I need to save up for some nice stainless tubular manifolds then

Like theses...

http://www.ebay.de/itm/Opel-Omega-B-2-5-3-0L-V6-Rennsport-Edelstahl-Manifolds-Limosine-Kombi-Neu-/231226496762?pt=DE_Autoteile&hash=item35d62c56fa

[Kevin Wood]

I'm not sure if this "purist" accusation is entirely fair, TBH. 

Yes, many of us would advise against modifications such as this, but it's not because we are purists. I think it's fair to say that whilst the majority of the more experienced members here drive pretty standard Omegas, most of us have a fair track record of messing about tuning other cars in one form or another and have a good feel for what works and what doesn't as a modification.

Furthermore, if we look at a modification that actually works - example: fitting poly front wishbone bushes - you'll find most of us have done it.

We also have developed a very good understanding of how every aspect of the Omega works and those of us who help out members with code reading and maintenance on a regular basis have experienced and driven a wide variety of Omegas, both modified and standard, in good and poor condition.

I'm sure I speak for most here when I say that, if we recommend not bothering to change your air filter for a fancy one, it's because we know it will be a waste of money!

If you insist on tying it, though, a cheaper method is to make sure there's no junk in your airbox and intake ducting, wait for a damp day when there's little airborne dust and take a quick blast around the block with no air filter fitted. If you can tell the difference in performance terms, then maybe I'm talking out of my @rse! At least you won't have wasted any money.

[Marks DTM Calib]

Do I need to save up for some nice stainless tubular manifolds then

Like theses...

http://www.ebay.de/itm/Opel-Omega-B-2-5-3-0L-V6-Rennsport-Edelstahl-Manifolds-Limosine-Kombi-Neu-/231226496762?pt=DE_Autoteile&hash=item35d62c56fa

They look rather nice, will they fit the RHD cars?

The main issue with the manifolds is that all cylinders (all be it to a much lesser extent on No's 1 and 2) have a 'stub' which creates interesting effects in the gas flow at certain RPM.

That and the 2.5/3.0 ones being quite restrictive (as we know the 2.6/3.2 ones are better and a good little mod but not the ultimate solution).

[humbucker]

I'm not sure if this "purist" accusation is entirely fair, TBH. 

Yes, many of us would advise against modifications such as this, but it's not because we are purists. I think it's fair to say that whilst the majority of the more experienced members here drive pretty standard Omegas, most of us have a fair track record of messing about tuning other cars in one form or another and have a good feel for what works and what doesn't as a modification.

Furthermore, if we look at a modification that actually works - example: fitting poly front wishbone bushes - you'll find most of us have done it.

We also have developed a very good understanding of how every aspect of the Omega works and those of us who help out members with code reading and maintenance on a regular basis have experienced and driven a wide variety of Omegas, both modified and standard, in good and poor condition.

I'm sure I speak for most here when I say that, if we recommend not bothering to change your air filter for a fancy one, it's because we know it will be a waste of money!

If you insist on tying it, though, a cheaper method is to make sure there's no junk in your airbox and intake ducting, wait for a damp day when there's little airborne dust and take a quick blast around the block with no air filter fitted. If you can tell the difference in performance terms, then maybe I'm talking out of my @rse! At least you won't have wasted any money.

If your reply was in response to my comment, then please do not think I was singling out anyone in particular. I was merely pointing out the 'nah, no point' attitude of a lot of car owners (evident in other clubs too) who DON'T have the knowledge or experience to advise effectively. I mean, rather than say 'no, X Y and Z will never make a difference, waste of time' etc, it is more constructive to say 'X Y and Z will only work if you apply changes A B and C'. I guess I was referring to the trigger happy few that are keen to shoot an enquiry down in flames rather than respond constructively.

[05omegav6]

Do I need to save up for some nice stainless tubular manifolds then

Like theses...

http://www.ebay.de/itm/Opel-Omega-B-2-5-3-0L-V6-Rennsport-Edelstahl-Manifolds-Limosine-Kombi-Neu-/231226496762?pt=DE_Autoteile&hash=item35d62c56fa

They look rather nice, will they fit the RHD cars?

The main issue with the manifolds is that all cylinders (all be it to a much lesser extent on No's 1 and 2) have a 'stub' which creates interesting effects in the gas flow at certain RPM.

That and the 2.5/3.0 ones being quite restrictive (as we know the 2.6/3.2 ones are better and a good little mod but not the ultimate solution).

Don't see why they won't fit, given the steering idler and pitman arm are an exact mirror and there's no steering column in the way Any mention of different manifolds/down pipes on LHD cars in TIS?

[Marks DTM Calib]

I recall some issues as the LHD pipe work is designed based on a steering box being mounted on the 'wrong' side and hence the 1-3-5 pipe work can foul the steering box on RHD cars (as its been desigend assuming its not there).

Of course, might not be a problem with these.

[omega3000]

K&N panel filter's are available 

http://www.ebay.co.uk/itm/K-N-AIR-FILTER-FOR-VAUXHALL-OMEGA-2-2-1999-2003-33-2734-/390824166695?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item5afeef8527

So they are, at at least three times the price of a genuine one I very much doubt that they're three times better though

Yeah they always been a bit expensive but will pay for itself over time 

[Kevin Wood]

I'm not sure if this "purist" accusation is entirely fair, TBH. 

Yes, many of us would advise against modifications such as this, but it's not because we are purists. I think it's fair to say that whilst the majority of the more experienced members here drive pretty standard Omegas, most of us have a fair track record of messing about tuning other cars in one form or another and have a good feel for what works and what doesn't as a modification.

Furthermore, if we look at a modification that actually works - example: fitting poly front wishbone bushes - you'll find most of us have done it.

We also have developed a very good understanding of how every aspect of the Omega works and those of us who help out members with code reading and maintenance on a regular basis have experienced and driven a wide variety of Omegas, both modified and standard, in good and poor condition.

I'm sure I speak for most here when I say that, if we recommend not bothering to change your air filter for a fancy one, it's because we know it will be a waste of money!

If you insist on tying it, though, a cheaper method is to make sure there's no junk in your airbox and intake ducting, wait for a damp day when there's little airborne dust and take a quick blast around the block with no air filter fitted. If you can tell the difference in performance terms, then maybe I'm talking out of my @rse! At least you won't have wasted any money.

If your reply was in response to my comment, then please do not think I was singling out anyone in particular. I was merely pointing out the 'nah, no point' attitude of a lot of car owners (evident in other clubs too) who DON'T have the knowledge or experience to advise effectively. I mean, rather than say 'no, X Y and Z will never make a difference, waste of time' etc, it is more constructive to say 'X Y and Z will only work if you apply changes A B and C'. I guess I was referring to the trigger happy few that are keen to shoot an enquiry down in flames rather than respond constructively.

No offence taken, I was just pointing out that that tends not to be the case here.

[05omegav6]

I recall some issues as the LHD pipe work is designed based on a steering box being mounted on the 'wrong' side and hence the 1-3-5 pipe work can foul the steering box on RHD cars (as its been desigend assuming its not there).

Of course, might not be a problem with these.

iirc that's why Mercedes never released a RHD v8 diesel in the W220... not helped by the change from the W140 steering box to a rack

Don't forget that the 246 head sits further back than the 135 one, so if anything, that would make it more of a challenge on a left hooker

Incidentally, the reverse is why fitting an LS lump in a RHD Omega is a bit of a headache

[cem_devecioglu]

between all these discussions for one thing I'm sure, ecotecs were not designed for high performance, the designers were after an acceptable power with minimal/acceptable fuel consumption..  if you want performance in na form solution partially easy.. open some air wents on the hood for both inlet sides..  use short inlet trumpets with independant throttles, discard the maf and ecu use map and a standalone.. then you will have much more power with a rocketing fuel bill

[Elite Pete]

Would fitting one of these make any difference to sound, performance or mpg than replacing with standard paper filter?

Chav