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166

Omega General Help / Re: P0420

« on: 21 October 2008, 20:25:48 »

Looks like the answr is "yes".

And Kevins Wood explains it incredibly well.

I have found and implemented a solution on my 3.2, but the principle is identical for your car. The latter part of this thread explains what I have done.

http://www.omegaowners.com/forum/YaBB.pl?num=1214690650

 I did this on a new stainless cat-back exhaust, but a new lambda boss could be added into a standard exhaust if you wanted to.

167

Omega General Help / Re: P0420

« on: 21 October 2008, 20:21:38 »

Im a mechanical novice so i dont know how many and where anything is really  

Sorry the question was really aimed at the forum members generally. If the answer to my question above is yes, then I think I may have an explanation and a solution, but t is a bit of an undertaking.

If the answer is no, then I've nothing of much value to add as a novice myself.

168

Omega General Help / Re: P0420

« on: 21 October 2008, 20:07:56 »

Does the 2.2 have the same pre-cat arrangement and 2 lambdas; one before the pre-cat and one after?

Perhaps the code is related to the same issue, but it can only have it on the one "side" as it were?

169

Omega General Help / Re: ncdc 2015's and colour screens...

« on: 02 January 2009, 10:08:14 »

im not bothered bout the telemtics hotel21.. just fancy the full colour screen like on your new elite

If you're not fussed about being able to have a sim card built into your phone then you don't need the NCDC2015. The NCDC2013, which is easier to find, will do it and save you a little space in the glove box to boot.

170

Omega General Help / Re: Which Omega

« on: 02 January 2009, 10:13:00 »

Thanks for that, should have betwee  £1.5 and £2k to spend so should be able to find an elite 2.5 v6

Look for a 3.0/3.2, the difference in performance is noticable over the 2.5

And because the bigger engines work less hard, there's not much in it between a 2.5 to a 3.2 on fuel consumption either.

171

Omega General Help / Re: Replacing 16" alloy with 17"

« on: 23 December 2008, 03:07:06 »

Bolt straight on and solve all your problems. I've seen full sets with 4 good tyres on them for less than the price of 4 new tyres.

Go for it; you know you want to. Replacement tyres won't be much more, if anything, either when it comes round.

172

Omega General Help / Re: Comma ATF, any good?

« on: 25 December 2008, 08:54:30 »

pity your not nearer, ive 3 litres of vauxhall atf left over, cant take it back as my son took the seals off the lids

and 2 spare copper washers for the nut

Where are you? I might be in the market for it if I'm near enough to you.

173

Omega General Help / Re: Exhaust configurations

« on: 24 December 2008, 19:07:35 »

I'm pursuing this line of questioning elsewhere (ABS) too just to see if I can get any further insight or wisdom. I have had a bit of feedback which concerns me slightly.

can't comment on this particular setup, but I know in many cases those trumpets although look restrictive will actually help airflow at the top end of the rev range and increase power (less air turbulence as the air is directed into the AMM)

Now don't worry too much as this is specifically in reference to the top half "trumpet" and not the bottom half fibrous pipe which was what I believe the Chipped UK man was talking about and that you have already had cut flush in your air-box Steve. The trumpet may be something that we shouldn't be taking out. Noise is nice, but not at the expense of performance.

I rang Chipped UK again today for further clarification, but the technical guru there who originally advised me was "away filming with Top Gear" for the day (How cool is that?). I will call him again tomorrow to find out exactly what his take is on each of the two pipes. He did say "cut the pipe so it is flush and you'll gain horsepower, it is there as a restriction".

The trumpet piece in the top does not need "cutting" so I am guessing at this stage that he was referring to the bottom pipe only given the quote above.

I'll update tomorrow.

OK, an update:

Cut the fibrous pipe out as this has been verified by over 5 discrete sources as being added specifically to restrict air-flow and keep the 3.2 within a certain power tax bracket for company car use. Cutting it flush does increase performance and not noise.

Do not remove the trumpet shaped affair in the top of the air-box as this is needed. Removing it is actually detrimental and caused my car symptoms which reconcile with what I read on a German forum. With the trumpet removed my car would occasionally stall from a warm start as the idle would drop too low.

Will be checking out exhaust mid sections with sports cats now and the benefits (or not) of a balanced cross over and if this is good where should it go for the best balance of torque gains.

Tubular manifolds will be following that shortly, but the jury is out on that one as to whether it will be of much benefit.

I am going to a fully qualified Vx Omega tuning specialist in January (with Dan ^^) who tuned all of the Nottinghamshire plod Omegas who will give me some more insight.

174

Omega General Help / Re: Exhaust configurations

« on: 19 December 2008, 18:37:34 »

sorry about those tyre sizes nathan, was having a blonde moment and forgot it was percentage of the width (duuuh)

anyway... if your still wanting more power after a remap and exhaust then where else can you go ?

Monaro VXR

That's definitely on my list. I just need to check my bonus this year.

175

Omega General Help / Re: Exhaust configurations

« on: 18 December 2008, 23:00:38 »

What you've been told from where?

basically (i think they're a member on vvoc) i was talking to somebody on migweb/mvoc and they said how they'd turbo'd the vectra 2.5 but said to only run it upto 6psi, they said it'd run but it really wanted mapping for the boost at 6psi and then anything over that it needs fuel management and spacer plates etc

so reading between the lines i'd go for 4psi max with nothing done and then better safe than sorry

for the hassle of fitting a turbo only to run at 4psi its not worth it will mabye get you 15/20 bhp !  

Not worth the hassle if you can get that with a decent exhaust system and a professional rolling road remap. I reckon you'd get better fuel economy, responsiveness and engine longevity from the exhaust / remap route rather than a blower too.

176

Omega General Help / Re: Exhaust configurations

« on: 18 December 2008, 22:46:19 »

"235x35x19 to 255x35x19"
there's no difference in radius, only in tyre width

Not true

The middle "35" bit is a % of the width of the tyre. i.e the 35 = 35% of the width expressed in mm

Therefore the "35" on a 235 = 82.25mm tyre wall height, whilst "35" on a 255 = 89.25mm tyre wall height.

That is 7mm difference in "height" (rolling radius) or 14mm difference in overall height of the tyre.

Multiply that by Pi ([ch960]) which equals "roughly" 3.14159265358979323846264338327950288419716939937510 (it is an irrational number so has no finitely exact value) and you'll end up with a rolling radius difference of 43.982297150257105338477007365906mm.


To back this up; if you look on here:...

http://www.club80-90syncro.co.uk/Syncro_website/TechnicalPages/TRC%20calculator.htm

...you'll see that the rolling radii are 1974mm and 2016mm respectively for the two tyre's sizes that you claim are the same which is a difference of 42mm on the rolling circumference and 7mm on the dynamic rolling radius.

This is obviously not exact as all sorts of things such as variances in manufacturers specifications come into play, but in principle you're wrong on this one mate.


 

177

Omega General Help / Re: Exhaust configurations

« on: 18 December 2008, 20:51:42 »

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/supercharging then again there is nitrous.

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

So what's been good and what's not?

178

Omega General Help / Re: Exhaust configurations

« on: 17 December 2008, 22:55:59 »

What you've been told from where?

179

Omega General Help / Re: Exhaust configurations

« on: 17 December 2008, 22:53:01 »

could use a s/charger or turbo to get a couple of psi boost which should run fine without remapping or anything

I think that this was all covered off earlier in the thread TBH

180

Omega General Help / Re: Exhaust configurations

« on: 17 December 2008, 22:45:46 »

I don't want to "go daft"; just mildly enhance methinks