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[Marks DTM Calib]

The original manifolds (2.5/3.0) are thick walled cast iron, the later ones are thin welded formed steel and have improved flow characteristics.

The only mod required is to take your existing front pipes and on the end, where the front pipe to manifold gasket sits, is a metal lip, this needs cutting back by about 5mm to allow it to correctly mate with the later steel manifolds.

As for the FPR, dont waste money on over priced ones if your set on getting one, get a 3.7 BAR one off a 2.6/3.2 and dont expect great gains, you might see a little during WOT (although unlikely but this will be the only place you might see some as the setup is in open loop control during WOT) but, the block learn valves will have adjusted any short term gains out of the setup automaticaly after a few miles.

As for what you saw on your Vectra, the 'gains' are less than the accuracy of the rolling road which have very varied results dependent on operator, time of day, weather conditions yadda yadda yadda....basicaly, a rolling road is not accurate so take them with a pinch of salt.

[TheBoy]

As others have said, the ECU will trim back anything that allows more fuel in, without getting more air in. That's what a close loop system does, and with each new Euro emission standard, the ECU maps have to get tighter and tighter and tighter.

So, whilst you may get a short term gain (beyond any placebo effect), the ECU will simply, and quickly, learn and trim it right back.


As to the rolling road results, that's too close to call, given I bet I could put my supposedly 200+bhp Omegas on 3 different rolling roads, and get +/- 10% easily.  Additionally, due to the nature of the clientele that many rolling roads are marketing at (the my-cock-is-bigger-than-yours pub bragging), they do tend to be somewhat optimistic

[Kevin Wood]

Yep, rolling roads can be quite repeatable, if atmospheric conditions are properly compensated and the rollers are maintained and used meticulously. I've seen Dave Walker's rollers produce figures within a few BHP for the same car on different dates.  You can't normally rely on a rolling road, or an engine management system, to be that consistent, so your gains are probably "in the noise".

Sadly, that "baseball cap on backwards" types who normally operate such facilities really don't understand what they are doing and, especially if they have a vested interest in fudging the results so that their tuning mods look good, can't be relied upon.

[minifreek]

The rolling road I use and have always used is A&M Vauxhall specialists on Deeside (almost but not quite North Wales).

He doesn't cater for the CHAV baseball willy wavers..... he doesn't have time for them...



I have the adjustable Facet FPR already and will install it, when I find out which is the return feed for the tank....

[TheBoy]

I have the adjustable Facet FPR already and will install it, when I find out which is the return feed for the tank....

Good luck, be interesting to see a before, after, and after 1 month.

Would also be interesting to see the LTFT readings after a few days

[henryd]

The rolling road I use and have always used is A&M Vauxhall specialists on Deeside (almost but not quite North Wales).

He doesn't cater for the CHAV baseball willy wavers..... he doesn't have time for them...



I have the adjustable Facet FPR already and will install it, when I find out which is the return feed for the tank....

Pretty sure the 17 mm nut is the return

[cem_devecioglu]

my experience with the 2.5 is that, after port polishing and 3.0 cams, I felt low rpm torque values are lower than before, as the car pull is not like before.. however, upper range rpm hp values are obviously much higher.. this was visible on dyno.. - 187 hp - so be aware in daily usage on streets higher flow exhaust manifolds wont help your consumption and torque values..

[2woody]

I'd not expect much of a gain without properly adjusting the fuelling - and by that I mean a bespoke map.

There's a lot of misinformation about the 4 "G" cams. Yes, they were installed in the 2.5 Vectra GSi for 200 BHP, BUT this was with a fuel map to suit. changing the cams alone is not a recipe to get the same output I'm afraid.

As a counterpoint, my 2.6 had 4 "G" cams in it when I bought it. I had "before and after" dyno tests conducted when I put the original cams in and picked up 8HP by going back to the original.

I'm predicting 185BHP if the dyno is properly calibrated. So that's 175 to 195 in the real world

[P6UL K]

The rolling road I use and have always used is A&M Vauxhall specialists on Deeside (almost but not quite North Wales).

He doesn't cater for the CHAV baseball willy wavers..... he doesn't have time for them...



I have the adjustable Facet FPR already and will install it, when I find out which is the return feed for the tank....

So hard at times just to get a straight answer huh! So many unasked for opinions at times its quite frustrating! Spend your money as you see fit and do as you want matey, i'm all for pulling away from the crowd as i have done with my Miggy 

[cem_devecioglu]

my experience with the 2.5 is that, after port polishing and 3.0 cams, I felt low rpm torque values are lower than before, as the car pull is not like before.. however, upper range rpm hp values are obviously much higher.. this was visible on dyno.. - 187 hp - so be aware in daily usage on streets higher flow exhaust manifolds wont help your consumption and torque values..

must note also

port polish+
+cams
+throttle modified
I changed 2.5 ecu to 3.0 ecu 
and used used 3.0 inlet divider

and get 187 hp original was 143 

and also witnessed 150 hp so called cars getting 130 hp

[minifreek]

The rolling road I use and have always used is A&M Vauxhall specialists on Deeside (almost but not quite North Wales).

He doesn't cater for the CHAV baseball willy wavers..... he doesn't have time for them...



I have the adjustable Facet FPR already and will install it, when I find out which is the return feed for the tank....

So hard at times just to get a straight answer huh! So many unasked for opinions at times its quite frustrating! Spend your money as you see fit and do as you want matey, i'm all for pulling away from the crowd as i have done with my Miggy 

Thankyou for a straight and honest answer y)



I have noticed, since joining this forum, that there are many unwanted opinions/answers but I guess thats just how it is...

I do value opinions from most but when I ask a simple question I do kinda expect a simple answer, if I want an opinion, I will ask... such as calling something like 'tracking' and I get an unwated answer of 'I hope you really mean a full geometric set-up' - no I mean tracking... end of... but just my opinion on the matter...

[05omegav6]

The rolling road I use and have always used is A&M Vauxhall specialists on Deeside (almost but not quite North Wales).

He doesn't cater for the CHAV baseball willy wavers..... he doesn't have time for them...



I have the adjustable Facet FPR already and will install it, when I find out which is the return feed for the tank....

So hard at times just to get a straight answer huh! So many unasked for opinions at times its quite frustrating! Spend your money as you see fit and do as you want matey, i'm all for pulling away from the crowd as i have done with my Miggy 

Thankyou for a straight and honest answer y)



I have noticed, since joining this forum, that there are many unwanted opinions/answers but I guess thats just how it is...

I do value opinions from most but when I ask a simple question I do kinda expect a simple answer, if I want an opinion, I will ask... such as calling something like 'tracking' and I get an unwated answer of 'I hope you really mean a full geometric set-up' - no I mean tracking... end of... but just my opinion on the matter...

Many an Omega has ended up scrapped in frustration from ignoring that particular piece of advice...

As to the fuel rail, it's clearly the smaller one, although all that 'opinion' that people have posted, is actually detailed information as to why it won't work. You are of course free to ignore any posts which you don't like or agree with.

As to your first sentence, Paul didn't answer your question either

[henryd]

The rolling road I use and have always used is A&M Vauxhall specialists on Deeside (almost but not quite North Wales).

He doesn't cater for the CHAV baseball willy wavers..... he doesn't have time for them...



I have the adjustable Facet FPR already and will install it, when I find out which is the return feed for the tank....

So hard at times just to get a straight answer huh! So many unasked for opinions at times its quite frustrating! Spend your money as you see fit and do as you want matey, i'm all for pulling away from the crowd as i have done with my Miggy 

Thankyou for a straight and honest answer y)



I have noticed, since joining this forum, that there are many unwanted opinions/answers but I guess thats just how it is...

I do value opinions from most but when I ask a simple question I do kinda expect a simple answer, if I want an opinion, I will ask... such as calling something like 'tracking' and I get an unwated answer of 'I hope you really mean a full geometric set-up' - no I mean tracking... end of... but just my opinion on the matter...

Many an Omega has ended up scrapped in frustration from ignoring that particular piece of advice...

As to the fuel rail, it's clearly the smaller one, although all that 'opinion' that people have posted, is actually detailed information as to why it won't work. You are of course free to ignore any posts which you don't like or agree with.

As to your first sentence, Paul didn't answer your question either

I did though,ages ago

[annihilator]

Your miles away LOL would cost a fortune to courier them Id have thought...?

try these http://www.parcel2go.com/
i got a 18" tyre sent for less than a tenner.

[05omegav6]

The rolling road I use and have always used is A&M Vauxhall specialists on Deeside (almost but not quite North Wales).

He doesn't cater for the CHAV baseball willy wavers..... he doesn't have time for them...



I have the adjustable Facet FPR already and will install it, when I find out which is the return feed for the tank....

So hard at times just to get a straight answer huh! So many unasked for opinions at times its quite frustrating! Spend your money as you see fit and do as you want matey, i'm all for pulling away from the crowd as i have done with my Miggy 

Thankyou for a straight and honest answer y)



I have noticed, since joining this forum, that there are many unwanted opinions/answers but I guess thats just how it is...

I do value opinions from most but when I ask a simple question I do kinda expect a simple answer, if I want an opinion, I will ask... such as calling something like 'tracking' and I get an unwated answer of 'I hope you really mean a full geometric set-up' - no I mean tracking... end of... but just my opinion on the matter...

Many an Omega has ended up scrapped in frustration from ignoring that particular piece of advice...

As to the fuel rail, it's clearly the smaller one, although all that 'opinion' that people have posted, is actually detailed information as to why it won't work. You are of course free to ignore any posts which you don't like or agree with.

As to your first sentence, Paul didn't answer your question either

I did though,ages ago

Indeed you did Henry

Doubtless the OP will be along shortly to say thank you...