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76

Omega General Help / mpg what do you get/expect

« on: 03 September 2009, 18:47:56 »

Hi everyone just curious as to what other drivers get fuel wise to the gallon ive got a 2.5 auto and i get 22-25 round town 30 to 33 on a run 28 when hooked up to the van, also got a tuned 2.5 manual that gets 20-22 round town 35 on a run and 18 when you use the loud pedal to embaress other car owners who think the can drive.

77

Omega General Help / cam cover gaskets

« on: 14 August 2009, 19:40:39 »

how easy is it to replace the cam cover gaskets on a 2.5 v6? 1 looks like it is weeping oil just wondered whats in volved

78

Omega General Help / Re: help please water leak

« on: 11 July 2009, 20:49:42 »

thanks for that just the bit thats broke
you people on here are and the best thanks again

79

Omega General Help / help please water leak

« on: 11 July 2009, 20:38:08 »

Hi everyone wonder if someone can help me
I have a 2.5 petrol auto saloon and it has developed a water leak. it appears to be leaking from the back of the engine tucked up there are 2 pipes going in to a plastic valve of some type while the engine is running it drips out however when i stop the engine it seams to pour out.
How easy is it to get at and how easy is it to solve. do i need to strip out all the top of the engine where the vac pipes etc sit.

thanks in advance Danny 

80

Omega General Help / Re: Some questions from a new owner

« on: 03 June 2009, 22:55:23 »

On very early Omega's the aerial was built into the rear windscreen, sounds as if yours just needs tightening.
regards
richarda
 

All Omega saloons have the radio aerial built into the rear screen!

the radio aerial is on the roof its a 99 saloon its not in the rear heated screen or am i looking at something totally different

81

Omega General Help / Re: Big Brake Upgrade?

« on: 03 June 2009, 19:15:22 »

Is one available? Can any of the units from the GSI / VXR astra's / Vectras be used? I am a little shocked how small the std discs are (something like 286 or 296mm) for such a heavy car. Would have throught that something in excess of 310mm should be available and a 330m for 18 inch wheel. For reference, my last golf had 312mm brakes as std on the 2.3 V5 model and that was only 'adequate'.

Failing this I guess some uprated pads and / or discs - any suggestions?

you can use all 5 stud discs from the vauxhall vectra/astra gsi/vxr models 330mm is the biggest i think you will need the calipers to match,or spaces to use the miggy ones. as for pads mintex 1144 fast road pads or ebc green range hope this helps

82

Omega General Help / Re: LPG on DTI engine

« on: 23 May 2009, 20:13:45 »

i dont know who installa lpg on cars, but  i guess its the same as on trucks they use a 25% lpg to deisel to cut emmissons

83

Omega General Help / Re: fitting a towbar to an estate

« on: 15 January 2009, 14:09:44 »

i have fitted towbars to my estates before,and from mermory there are 4 spacers 2 each side each side has different lengths. they are made from mild cold rolled steel for strength do you have the make of towbar? i have a friend who works in an enginering place who can make them for you if needs be


and i can drop them off next week when i am down your neck of the woods
 

84

Omega General Help / Re: Exhaust configurations

« on: 21 December 2008, 20:01:48 »

Hi Chris
  the manifolds for the carlton/senator where sold by a german tuning company and indeed where "off the shelf" they did do a bespoke manifold/exhaust system for the senator whoever that ment going to germany for 3 days.

The last senator i had back in1992 was a 24 valve 3.0 manual which i tuned to the limit, ported and polished head 285 piper cams veneir pullies alpha weber ignition/injection manifolds from germany exhaust from ashley stainless in leeds rollin road set-up net result was 320 bhp up from 204 and 296 lbs/foot t up from 199

85

Omega General Help / Re: Exhaust configurations

« on: 20 December 2008, 19:11:04 »

the omega was built the way legislation allowed for at the time  that is a compromise between emissions v consumption and power v weight.

the v6 engine was indeed tuned for a fat and flat torque curve as it is torque that gets a vehicle moving not bhp. 4 pot petrol omegas use more or less fuel as the six pot cos their power is devloped higher up the rev range. 2.0 16 valve is 100kw@5600 and 185nm @ 4000 V 2.5 v6 24 valve 125kw @ 6000 and 227nm @ 3200 3.0 v6 24 valve 155 nm @ 6200 and 270nm @ 3600.

although the outputs stated give the maximum output at the revs stated you need to understand that the 2.0 16 torque curve is steep very little torque below 2000 revs then 110nm rising to 185nm at 4000 back down to100nm by 5000 revs. the v6s by comparison deliver over 180nm from 1600 revs to 5200revs with the peak coming in in the middle of the range.

I shall concentrate on the v6 now. You can gain a higher torque figure for a longer rev range by altering the cam phasing without making the power delivery peaky,by fitting reprofiled cams that are only altered from standard by 8 degrees this still gives a fat and flat torque curve however instead of 180nm between 1600 and 5200 you get 195 nm. not alot more i grant you but enough to lower in gear acceleration by about 1.1 seconds over standard.

I have done quite abit to my 2.5 manual the only thing left to do is the exhaust side of the combustion cycle. I fitted a cold air feed air filter to reduce the temp of the air entring the engine making the air denser therefore  giving a better responce when mixed with fuel and fed in to the engine. i have reprofiled cams to alter the valve times to allow better combustion had head work done on the valves size and shape a remap done while the car was being driven to get rid of flat spots sports cats and stainless cat back exhuast to get the spent gases out quicker lightened flywheel to aid throttle responce.
While i can drive around on a light throttle in town and still get 20 to 22.5 mpg when you start puttin your foot down that dips to 15 to 17 mpg yet while crusing to liverpool at a steady 80 i get 31 or 32 mpg.
I will admit that the cost of the modifactions i have done are not cheap or practical but to me they are worth every penny ive spent.

As for tubular manifolds and/or forced induction the cast iron exhaust manifolds fitted to all mass produced cars are tuned for economy and built for a low price they will always be restrictive it is weather you can afford to or want to change them from standard however i have in the past fitted tubular manifolds to various vauxhall carltons and senators with 3.0 engines and they have only improved performance and sound with no negitive side affects.

86

Omega General Help / Re: Exhaust configurations

« on: 18 December 2008, 22:09:11 »

main bad points are PRICE for what i have done to the car i could have got another omega fuel economy or lack of it and 5000 service intervals,and exhaust  sound while cruisin can be boy racerish and boomy.

GOOD POINTS

quick very quick when floored very tractable the ideal sleeper car looks normal but capable of very swift travel the power to upstage bmws and mercs

87

Omega General Help / Re: Exhaust configurations

« on: 18 December 2008, 18:56:58 »

Hi Nathan, interesting reading this thread I have a 2.5 manual saloon which i have played around with
1. lightened flywheel
2. reprofilled cams
3. ported heads
4. remapped chip
5. stainless cat back exhaust (sports cats)
6. modified viper ram air induction kit with relocated cold air feed
7. rollin road tuned

192 bhp and 187 lbs/foot, quick of the line pdq once on the move

Ive gone as far as I can go with out manifolds and/or turbo/superchargin then again there is nitrous.

All the above has had a a maked affect on performance not all of it good hence why i thought of turbo or superchargin, I have spoken to a exhaust maker with reguards to manifolds though the cost of these are beyond my budget at the moment.

88

Omega General Help / Re: Fuel Type

« on: 20 December 2008, 17:28:09 »

the ecu on all petrol omegas will run either unleaded or super unleaded there is no lead in either so wont damage anything.super unleaded has the same octane rating as the old 4 star and as such has better combustion in the cylinders. slightly better running on su than reg u

89

Omega General Help / supercharging/turbo

« on: 17 December 2008, 19:41:53 »

Not sure this is in the right section so sorry in advance.


i own 3 omegas 2 saloons and an estate all have v6 engines 2 2.5 and a 3.0
My questions are based around either turbo or supercharging the 3.0 engine and if thats possible the 2.5s as well.
 
Is it possible to do either or will cost be prohibitive.

Also does anyone know where to buy limited slip diffs from  

90

Newbie Welcome Area / Re: Good afternoon all another new member

« on: 20 December 2008, 19:15:14 »

hi george welcome to the best omega forum on the net