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[minifreek]

Having recently changed inlet manifold and injectors, was wondering if there is any difference or benefits to be had via 'bolt on - off the shelf' parts from a scrappy....

Mine is the 2.5 V6 and have had a little play with the engine, Iv changed to a 2.6 inlet manifold and black injectors. Changed from 2.5 manifold and orange/red injectors...

I measured the bore of the 2.6 manifold and discovered that it is 3mm bigger than the 2.5.... better flow...?

The injectors are black compared to the orange/red injectors - dunno if they have a better flow or better spray pattern, I understand about closed loop and the ECU will only allow so much fuel into the engine, but experimenting in this way can't harm the engine Im sure...

I have noticed that the engine is a little more responsive, but that could just be down to the placebo effect... a bit like the chavs do with their big bore exhausts - its sounds faster so therefore it is.... noise does not equal power.... but they dont seem to understand this...

Is it beneficial to fit other injectors from say a 3.2 or even a 3.0 to increase power maybe... Fuel economy (or lack of) is something that Iv learned to live with since buying my Omega in January last year, I dont do long journeys except for when we take a trip to the lakes but then we're normally dragging a 1.7tonnes lump on wheels so economy just aint there (think I managed to get the Inst MPG down to 7.2MPG on a long hill  ).....


So if anyone has any ideas as to injector differnces that might help, or even if different injectors from 4 pots that might work...

[Diamond Black Geezer]

If it helps you compare, I'm averaging 20.9 (2.5 V6 myself, too) - which moves to 22mpg when I've been on a longer run into the countryside to visit family. The average consumption hasn't been zero'd for a couple of months now (this is recommended, otherwise every time you floor it our of a junction or similar, your average plummets, so it's worth leaving it, the longer the more accurate the figure.)

I manage high 30s on a nice motorway run, and do touch 40 mpg just under 60mph as the brochure claims. As you say, mpg never going to be amazing, but worth knowing every little thing that can be done to tweak things, will watch this thread with interest 

[minifreek]

Iv also posted this on another forum, and asked the same questions etc...

The 2.5 injectors are the way to go.... no benefits to be had by fitting the 2.6 injectors, could be down to placebo effect or the 2.6 injectors are cleaner than the 2.5 injectors that I removed... BTW the injectors are blue not red, I was looking at a 2 litre injector at the time of writing... I get confused easily in my old age LOL

[Diamond Black Geezer]

Fair enough. I'd never heard of different injectors doing different things. However, at the same time, everything has to be tried once... 

[TheBoy]

The injector flow rate is matched to the engine in order to keep it within a certain spec for the ECU. No point running a very high flow injector if the ECU cannot back off fuelling enough, or low flow so injector runs constantly open at high load.

Same as those completely pointless "upgraded" FPRs that do precisely bugger all except make the ECU trim it excessively.

[Diamond Black Geezer]

Suspected this would fall into that same category, the old "more fuel = more power" philosophy, which, of course engines don't work that way. Worth knowing, though