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[TheBoy]

Only really worth comparing on the same engine TBH

..  on the same dyno on the same day. There is enough variation between dynos that you can't be sure you've made a gain otherwise.

However, looking at that dyno plot, it clearly doesn't exhibit the almost flat torque curve from 3,000 - 5,000 RPM that the standard engine does. Yes, the "pub figure" at the red line might appear impressive, but the multiram system is there to improve the spread of torque throughout the rev range.

Is 216hp impressive? GM quote between 209 and 217 (iirc) depending on age (and we know GM tend to underquote), and thats only a peak  :-/

[Kevin Wood]

Is 216hp impressive? GM quote between 209 and 217 (iirc) depending on age (and we know GM tend to underquote), and thats only a peak  :-/

No. I was talking in general. 

Accuracy of rolling roads being as it is, in general, I'd be surprised if it were that close to the manufacturer's figure even standard.

[weasel]

I never said it was impressive, nor did i put the dyno graph up here to try and impress anyone, i simply did it to show the effect it has made on the power/torque curve, in a hope that someone might have the graph from a standard one for a bit of a rough comparison. Im begining to wish i hadnt now though... :-/

[weasel]

Although serek was behind me in the queue for the same dyno on the same day, so might be worth seeing what his 3.2 produced

[TheBoy]

I never said it was impressive, nor did i put the dyno graph up here to try and impress anyone, i simply did it to show the effect it has made on the power/torque curve, in a hope that someone might have the graph from a standard one for a bit of a rough comparison. Im begining to wish i hadnt now though... :-/

Sorry, wasn't digging at you, was just trying to understand myself

[Kevin Wood]

Although serek was behind me in the queue for the same dyno on the same day, so might be worth seeing what his 3.2 produced

Now, that would be useful.

[feeutfo]

Iirc <my eternal downfall...

Auto's are really difficult to measure, as shown at a rolling road day on here a few years ago. The bhp figures where all down, and the graphs where all over the place.

However, the figures where eventually consistent if locked in 3rd. I can't find the graph from the day in question so it's a bit of a pointless post. But another 3.0 omega there with cone filter and now, (admittedly a good while later )suspected multi ram issue, was down on power to the others.

Sadly you'll have to take my word for all this though  :-/

[SteveT528]

To the OP if your tuning the omega remove the duel ram. if keeping standard then leave it in place as it does a good job for the every day driver.   the duel ram is there to smooth the torque and aid better fuel economy , if tuning you dont want good fuel economy :-)  vauxhall designed the duel ram for the best all round , the best all round is no use to anyone tuning.

ive had my duel ram on and off (replaced with a box like mantzels original) and i preffer the box even more so on the motorway!!

Just unplugging the duel ram or removing vacuums will loose power this is not the way to see what its like removed 

Last thing... GM spent loads of time designing everything on the v6 but they had emmision limitations and the every day driver in mind. the egr, heavy flywheel, SAI , restricted exhaust ports/manifolds due to SAI, heated throttle body, duel ram, full exhaust system, and a few other things are due to emmisions and every day drivers , changing/removing/modifing these items make a big difference.

Anyone that says vauxhalls way is best have no idea and are probably balding on the top  hence have no interest in playing with vauxhalls perfect v6 engine  trust me theres power to be released  but it can cost!

[weasel]

^^^^^ nail on the head springs to mind.... thanks for that! 

[mr carl]

To the OP if your tuning the omega remove the duel ram. if keeping standard then leave it in place as it does a good job for the every day driver.   the duel ram is there to smooth the torque and aid better fuel economy , if tuning you dont want good fuel economy :-)  vauxhall designed the duel ram for the best all round , the best all round is no use to anyone tuning.

ive had my duel ram on and off (replaced with a box like mantzels original) and i preffer the box even more so on the motorway!!

Just unplugging the duel ram or removing vacuums will loose power this is not the way to see what its like removed 

Last thing... GM spent loads of time designing everything on the v6 but they had emmision limitations and the every day driver in mind. the egr, heavy flywheel, SAI , restricted exhaust ports/manifolds due to SAI, heated throttle body, duel ram, full exhaust system, and a few other things are due to emmisions and every day drivers , changing/removing/modifing these items make a big difference.

Anyone that says vauxhalls way is best have no idea and are probably balding on the top  hence have no interest in playing with vauxhalls perfect v6 engine  trust me theres power to be released  but it can cost!

i must admit i was and still am wondering why they have a water way going through the throttle body, that just seems nuts....cooler air = better surely?

[feeutfo]

To the OP if your tuning the omega remove the duel ram. if keeping standard then leave it in place as it does a good job for the every day driver.   the duel ram is there to smooth the torque and aid better fuel economy , if tuning you dont want good fuel economy :-)  vauxhall designed the duel ram for the best all round , the best all round is no use to anyone tuning.

ive had my duel ram on and off (replaced with a box like mantzels original) and i preffer the box even more so on the motorway!!

Just unplugging the duel ram or removing vacuums will loose power this is not the way to see what its like removed 

Last thing... GM spent loads of time designing everything on the v6 but they had emmision limitations and the every day driver in mind. the egr, heavy flywheel, SAI , restricted exhaust ports/manifolds due to SAI, heated throttle body, duel ram, full exhaust system, and a few other things are due to emmisions and every day drivers , changing/removing/modifing these items make a big difference.

Anyone that says vauxhalls way is best have no idea and are probably balding on the top  hence have no interest in playing with vauxhalls perfect v6 engine  trust me theres power to be released  but it can cost!

i must admit i was and still am wondering why they have a water way going through the throttle body, that just seems nuts....cooler air = better surely?

Not on a cold morning, or generally in cold weather. Ever heard of carb icing on Kawaski's? No? Well, ram air is a kwaka speciality. Great in summer. But winter creeps in. Those long cool evenings turn into freezing cold evenings when you add in wind chill in an inlet tract at ton plus  at 3 or 4 degrees c air temp. It gets below zero and you have ice. On carbs thats fatal. The bike stalls or at best runs like a bag of shite.

Now I know these are fuel injected obviously. But we need just enough heat to keep things working without ice buggering things up. Hence your heated throttle bodies.

Car makers ain't daft ( although we all make mistakes ) they do this stuff at great expense for a damn good reason. It's ALWAYS worth baring that in mind. ALWAYS. 

[TheBoy]

To the OP if your tuning the omega remove the duel ram. if keeping standard then leave it in place as it does a good job for the every day driver.   the duel ram is there to smooth the torque and aid better fuel economy , if tuning you dont want good fuel economy :-)  vauxhall designed the duel ram for the best all round , the best all round is no use to anyone tuning.

ive had my duel ram on and off (replaced with a box like mantzels original) and i preffer the box even more so on the motorway!!

Just unplugging the duel ram or removing vacuums will loose power this is not the way to see what its like removed 

Last thing... GM spent loads of time designing everything on the v6 but they had emmision limitations and the every day driver in mind. the egr, heavy flywheel, SAI , restricted exhaust ports/manifolds due to SAI, heated throttle body, duel ram, full exhaust system, and a few other things are due to emmisions and every day drivers , changing/removing/modifing these items make a big difference.

Anyone that says vauxhalls way is best have no idea and are probably balding on the top  hence have no interest in playing with vauxhalls perfect v6 engine  trust me theres power to be released  but it can cost!

I mostly agree, but my understanding is that with the fully working multiram produces approx the same peak power as with it removed, its just it improved low rev torque as well.

The biggest problem, is people believe that if the likes of Courtney Sport say something is an improvement, be it cone filters, FPRs etc, it must be.  Sadly, there seems to be a lack of specialist Vauxhall tuning companies that do understand basic concepts.

[SteveT528]

Chris, your right about bike throttle bodys, but on the v6 in the uk the heated throttle body is a waste of time, the throttle body gets warm on its own without the coolant running through it.  i remember the days of carb icing though  but alots changed since 

Theboy, the multi ram is a good bit of kit, but once you start tuning its a real hold back the problem i find with the multi ram is it makes it feel like the cars quick to the average person. completely different but its almost like a lightened flywheel fit one and it feels like you have gained 20bhp when you havnt gained anything!.

i agree with vauxhall tuning companys... waste of time! i laugh when i read stuff on some of these companys sites.

I think everyone is different on this forum and owns their omega for a different reason its just a case of what your happy with. 

[feeutfo]

Merely an example. But you see the point? Obviously the omega is not just a uk model. They would have to include it in the original design.

[TheBoy]

Chris, your right about bike throttle bodys, but on the v6 in the uk the heated throttle body is a waste of time, the throttle body gets warm on its own without the coolant running through it.  i remember the days of carb icing though  but alots changed since 

Theboy, the multi ram is a good bit of kit, but once you start tuning its a real hold back the problem i find with the multi ram is it makes it feel like the cars quick to the average person. completely different but its almost like a lightened flywheel fit one and it feels like you have gained 20bhp when you havnt gained anything!.

i agree with vauxhall tuning companys... waste of time! i laugh when i read stuff on some of these companys sites.

I think everyone is different on this forum and owns their omega for a different reason its just a case of what your happy with. 

Yeah, they make the same basic engine for the global market (with additional additions/deletions for emissions purposes).

Although we've had some -25C winters recently, and air intake will reduce 1C for every 10mph.  I guess that is cold enough for the throttles to start to stick if the engine hasn't warmed up?


Once you overcome other restrictions - the intake is not the first place to start on this engine - then there is scope for changing the multiram system possibly. Although my understanding is its tuning the inlet length for a specific RPM for that capacity engine, so not sure how much you could improve.  I guess everything is refinable, but with deminishing returns.


The GM V6 in other cars is more compromised, due to space, so more scope to see improvements on Vectras, Chavaliers and Calibras.