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[cem_devecioglu]

Exactly. The physical differences between engines is what makes the biggest difference, namely cams and displacement.

3.0 ECU is a shot in the dark. it might make an improvement, it might make things worse. I wasn't designed for the 2.5 engine in the first place.

Oh, and the fuel pressure on both the 2.5 and 3.0 is 3.0 BAR, by the way. The regulator is the same, as are the injectors.

3.0 ecu works great on my 2.5..  I think both ecus are adaptive but 2.5 map more on the economy side instead of power..

[Diamond Black Geezer]

Leaving my 2.5 ECU on then!!! 

[Webby the Bear]

Ok then guys.

Let's say for arguments' sake you'd convinced me to go the 3L cams route as opposed to the chip.......

This extra flat spot thats created and fixed with the long plenum..... how bad is it?

[05omegav6]

Thanks boys.

DBG your explanation makes total sense.

Kev, would you reckon the 3.0 chip would do the same as a superchips chip? or not as the SC chip is designed specifically for the 2.5?

No, the Superchips chip will (hopefully) contain ignition and fuel maps that have been developed for performance rather than the usual mix of emissions, compatibility with all climates and market positioning that the OEM chip was, so that should given you some gains, and those who have tried it confirm this (and that it doesn't seem to impact reliability).

The 3.0 chip is a crapshoot. It's actually likely to have pretty much the same maps as the 2.5 IMHO. Timing might have been tweaked a little, the map might extend to higher MAF output (but this is of no consequence to the 2.5 as it hasn't got big enough lungs to reach it). There is heresay that it improves things, in combination with a load of other mods, but no evidence that the same returns wouldn't have been achieved with the 2.5 chip.

Don't expect stellar results from just a chip in any case.

By far the best modification is a complete 3.0 lump, as has been said.

Fixed

[Webby the Bear]

As mentioned before, amazing results not expected, and if TB is correct then it wont iron out the flat spots anyway.... although others have said different - ill just have to try one i think/

however, before i do..... 3L cams. they cause a flat spot(s) themselves. whats the experience of this?

[Kevin Wood]

Thanks boys.

DBG your explanation makes total sense.

Kev, would you reckon the 3.0 chip would do the same as a superchips chip? or not as the SC chip is designed specifically for the 2.5?

No, the Superchips chip will (hopefully) contain ignition and fuel maps that have been developed for performance rather than the usual mix of emissions, compatibility with all climates and market positioning that the OEM chip was, so that should given you some gains, and those who have tried it confirm this (and that it doesn't seem to impact reliability).

The 3.0 chip is a crapshoot. It's actually likely to have pretty much the same maps as the 2.5 IMHO. Timing might have been tweaked a little, the map might extend to higher MAF output (but this is of no consequence to the 2.5 as it hasn't got big enough lungs to reach it). There is heresay that it improves things, in combination with a load of other mods, but no evidence that the same returns wouldn't have been achieved with the 2.5 chip.

Don't expect stellar results from just a chip in any case.

By far the best modification is a complete 3.0 lump and AR35 gearbox, as has been said.

In fact, sod it.

By far the best modification is a complete 3.0 lump and AR35 gearbox Omega, as has been said.

Fixed

Fixed again.

[05omegav6]

Indeed

[TheBoy]

Webby, as has been previously said, you'd be a bit radio rental to buy a Superchips chips for £200-300, when half that will buy you a bigger engine complete with autobox and anything else you want, and this will perform far better, smoother than Superchips attempt (that IMHO wasn't that good).

I wouldn't even bother pissing around with £100 set of G cams. The 3.0l is just the only cost effective option if you want better performance and smoother power.

[Webby the Bear]

Fair enough jaime.

You mentioned I'd need everything from a 3l.

So block, heads, cams, ECU. Can I not use my old 2.5 plenum, inlets and sandwich plate?

[05omegav6]

Fair enough jaime.

You mentioned I'd need everything from a 3l.

So block, heads, cams, ECU. Can I not use my old 2.5 plenum, inlets and sandwich plate?

Webby, sincere apologies if this undoubtedly comes out the wrong way, but...

Obtain a COMPLETE 3.0 lump with ancilliaries/wiring/ecu/ar35 from a breaker, (hell you could even buy  cheapy from gumtree or wherever) and fit said COMPLETE lump to Eeyore. If you wish to rebuild it first, then great

Stop making everything so complicated for yourself

[chrisgixer]

Could probably get the complete car with 3.0 attached for not much more money.

[05omegav6]

Could probably get the complete car with 3.0 attached for not much more money.

Here do...

http://www.autotrader.co.uk/classified/advert/201411038708770/sort/priceasc/usedcars/radius/1501/page/1/postcode/nn36rq/model/omega/make/vauxhall/quicksearch/true/onesearchad/used%2Cnearlynew%2Cnew?logcode=p

[chrisgixer]

Perfect. Sort the suspension, bin those God awfull wheels, and away you go.

[05omegav6]

Perfect. Sort the suspension, bin those God awfull wheels, and away you go.

That actually looks quite tidy for the old fashioned version

[chrisgixer]

Perfect. Sort the suspension, bin those God awfull wheels, and away you go.

That actually looks quite tidy for the old fashioned version

Oh it's not as superior as the face lift Elite obviously, but needs must and all that.