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[Mr Gav]

Been filling with Tesco Ultimatum or whatever its called, 110.9, and has returned better power and mpg in tests than Shell and BP, but at maybe 5-10p cheaper per litre. Used to be on the Asda cheap n cheerful, but hearing it's probably the worst petrol you can buy switched. Haven't seen any appreciable/conclusive increase in fuel costs since the switch. 

No point in putting 99 RON fuel in the Omega, the ECU can`t take advantage of it as it isn`t designed to run on 99 RON, only the more modern ECU`s can utilise the benefits and give you a bit of extra power 

Oooh, now that's contrary to what I've heard elsewhere on OOF... anyone else have any experience of this? I understood that ECU would adapt anyway..    If not I'll be going back to bleeding Asda special 106p stuff, then, as I'm bleedin skint at the min!!! 

There was a review in EVO magazine a few years ago when these fuels stated getting popular at the garages, they used a V10 M5 and a Golf GTi and did some rolling road tests, the M5 did quite well with around 25bhp more but the GTi barely showed any benefit. Can`t remember the third car they used but had no benefit at all as it wasn`t designed to run on 99 RON fuel.

The conclusion they drew was that it was down to the ECU being able to take advantage of the extra octane which the GTi couldn`t but bearing in mind that this will have been around 8-10 years ago when they did the test.

[Diamond Black Geezer]

Ok... interesting. Next question.... can the Omegas ECU be reprogrammed to take advantage of this.... [scratches chin]... 

[05omegav6]

Presumably because the Golf was tuned to perform.well in emissions tests... 

[Diamond Black Geezer]

Presumably because the Golf was tuned to perform.well in emissions tests... 

What are you suggesting .... 


VW would never fake emissions tests.... 

[Kevin Wood]

The only sense in which an Omega ECU can "adapt" to fuel octane is that it will implement knock retard if the engine starts to detonate and this is picked up by the knock sensors.

What it doesn't do is offer any more ignition advance if fuel octane is better than the 95 octane for which it was designed. I've never seen the knock retard activating on any of the live data logs I've taken.

The likelihood is that, with an efficient combustion chamber design already, more ignition advance wouldn't give you more power anyway.

Put super unleaded in a very highly tuned engine with higher compression, or anything with forced induction, and it's a different story entirely.

[Mr Gav]

Ok... interesting. Next question.... can the Omegas ECU be reprogrammed to take advantage of this.... [scratches chin]... 

Even if you got an extra 5bhp which is unlikely the only place you would really notice the difference is in the wallet 

[Diamond Black Geezer]

Hmmm..... so the super fuel is a waste of time and money on an older engine, apart from the alleged added detergents, which a bottle of Wynns every once in a while is supposed to do, anyway. 


I am sad.

[baggers]

It's definitly in black and white Omega is suited to super unleaded and takes advantage of knock control.

[Diamond Black Geezer]

Oh dear, this is forums... some say the Omega doesn't have any ability to take advantage of super unleaded, some say it definitely does. 

I have to admit I always thought it did. Where's CarGod MarksDTMCalib when you need him?   

[STEMO]

How much difference can it make? We are talking about a two ton barge, not a fickin Ferrari.

[Diamond Black Geezer]

Don't let Webby hear you say that!  He has, after much deliberation, managed to deduce his car, after many tens of thousands of miles, and over a decade use, is basically identical in its 0-60 time as the brochure claims, or within 0.1 of a second.... And he now, therefore considers that to be 'slightly' down on power! If he were Leonardo Da Vinci he'd be re-doing the eyelids on the Mona Lisa on his death bed, I swear! 

[baggers]

It's definitly in black and white Omega is suited to super unleaded and takes advantage of knock control.

It's actually set up to accept beyond standard super unleaded.

[Broomies Mate]

Somebody must have the facts.

How far can the ECU advance the ignition timing?

Knock control (by definition) will retard the ignition timing until a 'safe' level of knock is detected.

Surely it can only advance/retard 'to-a-point'.

Without a re-map, I don't think the Omega (certainly the V6's, not sure about the 4pots) will make proper use from higher octane fuels.

My 4pot B235R has been remapped to take (minimum) 98RON fuel.  It responds lovely to a dash of Tuloene, taking the RON upto ~101/102.  The difference is night and day.

I just don't think the standard map for the Omega will do that!

[BazaJT]

Personally I've never owned a diesel powered vehicle,but I suppose really it's a case of horses for courses.What suits the way I drive/use my car doesn't make it suitable for someone else with different expectations/usage needs,much like lpg,again personally I wouldn't have that fitted as apart from losing boot space/gaining an extra hole in the bodywork for the filler I would never recoup the cost of kit/installation as I don't do the mileage.

[henryd]

I tow a lot so torque is what I'm after,sadly a petrol that can deliver what I want needs a  tanker following it,hence my towcar is a heavy turbo diesel,my othertwo are petrol powered though and one is turfbo'd