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[Marks DTM Calib]

If you did it on a petrol car, aside from failing the MOT every year, you'd have a permanent P0430 'Cat efficiency' code and accompanying light on the dash..

On a diesel (as in this thread) the emissions test is currently visual smoke only (soon to be visual smoke plus the visual presence of a 'CAT')

Not on a 3.0 you wont.....only 2.6/3.2 

[Brikhead]

If you did it on a petrol car you'd have a permanent P0430 'Cat efficiency' code and accompanying light on the dash..

Aren't the lambda sensors before the cats on the earlier v6's? How would the e.c.u. know?

[Brikhead]

Ref the fault code though, if the cat was then refitted for the MOT, would the codes/light go out, or will it need resetting?

On Vx's the e.m.l. should go out soon after the fault has been rectified, only a.b.s. and s.r.s. systems need re-setting.

[blackviper90210]

Your the man Brikhead, cheers 

[aaronjb]

If you did it on a petrol car, aside from failing the MOT every year, you'd have a permanent P0430 'Cat efficiency' code and accompanying light on the dash..

On a diesel (as in this thread) the emissions test is currently visual smoke only (soon to be visual smoke plus the visual presence of a 'CAT')

Not on a 3.0 you wont.....only 2.6/3.2 

Ahh - didn't realise the earlier cars weren't .. whatever standard it is that brought that in (Euro III, was it?)

[Cotty]

i wish there was something like that for the 2.2!!!

  You'll find that like the V6's your 2.2 would be easy to change the engine management chip.
For the V6 there's a phase 7 motorsport chip which is simple to install as no welding is needed so its out with the old and in with the new with a claimed extra 30bhp.
I decided against the idea due to the insurance increase and also fuel consumption!!
If your happy with what you've got,it runs well and has good mpg then stick with what you have.
I've had 34mpg out of my previous 1998 2.5V6 but that was cruising between 60-70mph on the motorway but I did that as a one off to test consumption because I like to use the performance that I've paid for and it's amazing how many V6 Omega's I've flown past on the m-way so the majority of owners can't afford to use the car for what it was designed for!!
Do any mods then let the insurance comp know as I guarantee you that if you don't and it comes to claim time you'll find that you're not covered.
Your engine was designed with the components you have so any altering has no guarantee it won't damage your car!!
Anyway he sold his cats to pay for a K&N

[Kevin Wood]

i wish there was something like that for the 2.2!!!

  You'll find that like the V6's your 2.2 would be easy to change the engine management chip.

It's only the early V6s that have a removable chip. 2.2, 2.6 and 3.2 all have flash based ECUs so no chip to replace.

Besides, the best way to tune a 4 pot is to replace it with a V6.

[blackviper90210]

i wish there was something like that for the 2.2!!!

  You'll find that like the V6's your 2.2 would be easy to change the engine management chip.

It's only the early V6s that have a removable chip. 2.2, 2.6 and 3.2 all have flash based ECUs so no chip to replace.

Besides, the best way to tune a 4 pot is to replace it with a V6.

If thats the case, is there any benefit on changing a 3.0 chip or best to stick with whats fitted?

[Kevin Wood]

If thats the case, is there any benefit on changing a 3.0 chip or best to stick with whats fitted?

On a 3.0, yes. The point is that the map on the later V6s (2.6 and 3.2) isn't stored on a removable chip, but on the 2.5 and 3.0 it is.

[sticka_v8_init]

Just searched this "phase 7 motorsport chip " and found it for about £30. Is it really a case of out with old, in with new = + 25odd Bhp? Any possible side effects?

[blackviper90210]

Is it just a case of getting a different chip and plug 'n play, or is there other changes to be made?

In that case where can I find these and rough costing?

Sorry for the million questions, I just believed there wasn't a cheap (ish) way of improving the 3.0 

[blackviper90210]

Just searched this "phase 7 motorsport chip " and found it for about £30. Is it really a case of out with old, in with new = + 25odd Bhp? Any possible side effects?

Beat me to it, lol 

[TheBoy]

Just searched this "phase 7 motorsport chip " and found it for about £30. Is it really a case of out with old, in with new = + 25odd Bhp? Any possible side effects?

Aside from the fact you'll never get that sort of increase in a month of Sundays, yes.

The downside is, there are a lot of inappropriate, poor chips out there, esp those off egay, that many I've seen have been disappointing.

A good chip, of which there are a couple will, at best, give probably just shy of 10%...  ...these tend to cost a couple of hundred quid.

[TheBoy]

I would add this phase 7 whatever is not one I've heard of, and is probably one I'd give a wide berth to.

[VXL V6]

The best results seem to come from remapping diesels, once i've de-catted my DTi (Must get SWMBO's done first along with replacing the rest of the exhaust) I am looking at getting it remapped.