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[Martin_1962]

OK here are my requirements

1) Boost bhp to about 200
2) Boost mid range torque (2500 to 3500 range)
3) Not lose anything over 2000rpm
4) Not too expensive

I am prepared to

1) Not drop below 99RON on fuel
2) Remove heads
3) Replace some engine components
3) Accept a small loss below stall speed.

Can't quite afford a 3.2 or the hassle of changing.

I think heads may need to be removed as there is no way I can do the exhaust manifolds in situ and 1 is blowing when cold.

Any ideas anyone?

[Rebel1]

For £299 Superchips.co.uk will give you an additional 13BHP and 24 lb ft...seems a reasonable place to start.

[Markie]

your really looking for that sort of increase to be changing to 3.2 cams...

Not sure if the 2.6 to 3.2 is as easy and productive as 2.5 to 3.0  :-/

[VXL V6]

The insurance is going to be affected as well by doing engine modifications.

[Martin_1962]

your really looking for that sort of increase to be changing to 3.2 cams...

Not sure if the 2.6 to 3.2 is as easy and productive as 2.5 to 3.0  :-/

Not even sure which cams are used in the DBW engines?

[Rebel1]

The insurance is going to be affected as well by doing engine modifications.

Only if you tell them - as an ex-claims manager, I know that the insurers and their engineers that inspect written off cars aren't set up to look for these kinds of engine mods...they look for non-standard wheels, body kits, big exhausts etc.

[Martin_1962]

Last time I enquired - no chips for 2.6 so I have asked them again

[Martin_1962]

The insurance is going to be affected as well by doing engine modifications.

Only if you tell them - as an ex-claims manager, I know that the insurers and their engineers that inspect written off cars aren't set up to look for these kinds of engine mods...they look for non-standard wheels, body kits, big exhausts etc.

I think with these cars they care little anyway, I have quite a big mod already and it made no difference to insurance. (My LPG kit), towbar made no difference either.

[Dazzler]

I don't think they do a chip as such but they can remao your ECU via a laptop. The other option is get a 3.0......

[Rebel1]

The insurance is going to be affected as well by doing engine modifications.

Only if you tell them - as an ex-claims manager, I know that the insurers and their engineers that inspect written off cars aren't set up to look for these kinds of engine mods...they look for non-standard wheels, body kits, big exhausts etc.

I think with these cars they care little anyway, I have quite a big mod already and it made no difference to insurance. (My LPG kit), towbar made no difference either.

Insurers definately wouldn't care about towbars and lpg conversions - they don't make the car go faster and don't make them more attractive to TWOCers

[cem_devecioglu]

With my previous car the biggest tork gain was from the head work as a result increasing the compression ratio..(not sure this can be done cheap style if you dont have friends in related jobs)

Changing the cams also will improve performance radically..(second hands can be cheap)

workin on valves (sure expensive eliminated)

exhaust manifolds+boxes can change the picture.. (quite pricey)

chip (sure is most cheap way)

other mods needs modification on cooling also(outside the subject)

But whatever you do consumption will be effected or you will get very little gain...if I'm not wrong..

Maybe will  be necessary to change ECU remap (also for lpg)

[Martin_1962]

My car could easily handle more ignition advance and higher compression ratio.

The cams as supplied are quite mild, but I don't know the fitments on the DBW engines, need someone with EPC to list all the variants.

Higher CR and more advance would help consumption rather than hinder, the LPG system follows the petrol system so would not need too much tweaking.

Cooling - same basic design is OK to around 220 - 240.

As to twockers - Omegas do not excite them - espeially with the good security they have.

Basically I want to make better use of 99RON petrol and 105RON (I think) gas.

The Y engines are lower compression, is the drop due to head design or piston design?

I have seen big increases due to CR improvements 10bhp at wheels on a 1600

[Kevin Wood]

Fitting more lairy cams will reduce the torque at low RPM. There's always a compromise with changing just cams as you are effectively moving the range of revs over which the engine breathes effectively. I'm sure someone who's got 3.0 cams in a 2.5 will be along to quantify this. May not be worth worrying about with a relatively modest cam change. Need to know if there's a similar spec. difference between 2.6 and 3.2 though.

Porting heads, fitting bigger valves, etc. tends to be more effective at high RPM, in conjunction with cam changes because that's the area where restrictions in gas flow start to become significant. Low RPM tends to suffer again because gas velocity reduces and the engine burns less efficiently.

If it's mid range torque you want the best solution is probably more cubes - i.e. a 3.2  :-/

However, upping the compression would also help and, given that you are on LPG that might be an interesting option. If the pistons are flat on all these engines the differences are in the combuston chamber volume. You just need to do the sums for each engine and see what'd work. Formula Here: http://en.wikipedia.org/wiki/Compression_ratio

Maybe a set of 2.5 heads would be a good option if they could be made to fit? Not sure if they'd make a significant difference - did the 2.5 have higher compression than the 2.6 or was it just the 3.0 / 3.2 that differed in this respect?

Sorting out the exhaust with a proper pair of tubular manifolds with the primaries tuned would also make an improvement in torque, I reckon. I hope somebody tries it one day 8-)

Kevin

[cem_devecioglu]

Increase in compression ratio will also increase midrange torque values.

Exhaust+manifold+valve modification will shift high torques to higher RPMs thats normal.

for cooling I see somewhere else the oil cooler in mega is taken out from the engine (external oil cooler by air)..

And someone open extra cooling holes behind the engine bay for cooling cylinders 5-6 (dont know how !!)

Wish omegas had vanos similiar apparats but unfortunately not..

PS: my experience from previous car mod :  better spend more money and invest bigger engine..

[TheBoy]

Any ideas anyone?

Unhitch your house from the back...