catalytic ? i would like to take out ???

[dell]

if i take out my catalytic coverters out would i get more power ?? and would i save any weight ???????? thanks

[Whitey]

Yes, but not much and Yes but not much.

Best advantages of de-cating are saving your cats being burnt out, and the noise.

Did I mention the noise?

[BigJL]

And you'd need to get the ECU re-mapped too.

[dell]

the cars going in to silverstone for the 30,000 miles service and taps ? ill de-cat it at the same time , ? thanks for the info on the ecu

[BigJL]

No probs. Tempted to get mine de-catted too but just worried it'll be too noisy, especially with the CCCs! Plus the added hassle of getting it MOT'd.

[lee02]

BigJL said:

And you'd need to get the ECU re-mapped too.

you only need to re-map the ecu to get through an MOT. All i do is put hem back in for MOT takes 15 mins.

Before anyone contradicts me both my tuscans have been de-catted and both have been ok

lee

[Whitey]

Hi Lee,

Were your engines S or RR engines with the decat chip to pass the MOT? I ask as my RR/S engine would not pass the MOT with this chip from TVR Power and needed it's cats put back in.

Re-map is not essential, it depends on the status of your current map, a lot of Sp6 engines run too lean.

BigJL, your S with CCC's and decats will be loud, but it's all down to how loud you consider loud.

cheers
Whitey

[NTEL]

Mine is decatted with my own decat pipes and has had a bespoke John Ravenscroft remap. I have made some new silencers in order for it to pass 105dba trackday noise tests which it does, just. I have big gains in both BHP and Torque, but some people don't believe that but its true. The emissions just about pass an MOT test but the engine has to be HOT. Its not due an MOT yet but I took it to my local MOT station and had it tested anyway.

So, Happy days

[dell]

how about the bhp i thought i would get more power

[NTEL]

dell said:

how about the bhp i thought i would get more power

I got 28 BHP more with the remap and the decats. First run on the rollers was 294 BHP at the wheels and the 6th run (on the same day) it was 322 BHP at the wheels.

BTW it is a standard 4.0l SP6 and not a RR/S.

Edited by NTEL on Friday 11th April 13:16

[The Pits]

For me too noisy with decat and CCCs. Ear splitting in fact and a blare not a pleasant noise. There's no way I wouldn't have got stopped at some point making that racket.

So I've had sports cats put in at TVR power, so I can keep my gains but reduce the noise. Standard cans quieten things down considerably but I loved the sound of the car with cats in and CCCs on. So at considerable expense the car has been sports catted, has been remapped on the rollers at TVR power and is keeping the CCCs. Dom is very happy with the results and I think overall it will be better than a full decat.

[Whitey]

Pits do you have the car back yet? If so, how does it sound?

[Whitey]

dell said:

how about the bhp i thought i would get more power

You will get a small increase just by decatting, a remap will add more, but it all depends on the state of your current mapping.

Best thing is to get a dyno run at a known dyno like surrey rolling road (so we can compare) and get a baseline figure before you begin any mods.

My original 2000 build RR engine with the cats still in (and 1000 miles before it died) made 338bhp (at the flywheel) on the SRR. With a freshly run in 2006 Sag spec engine build and de-cat pipes it made 364bhp.

I may consider a remap this year but dont expect to gain more than 5% max.

I dont know what % the decat pipes are responsible for, but I'm sure someone on here has dones back to back runs and the difference was less than 5%.(from memory)

Edited by Whitey on Friday 11th April 13:51

[BigJL]

Anyone got an S in London with CCCs and de-cat? I'd love to hear how it sounds.

So I understand the procedure as:

1) Buy a set of de-cat pipes - £150
2) Remove standard cats and stick the de-cats in - £??? (Is this a big job?)
3) Get the ECU remapped - £??? (Have read that this costs between £350 and £750?)
4) Buy ear plugs - £2
5) Grin like a nutter while creating anti-social levels of noise - PRICELESS

[saulk]

Bigjl,

PaulV on this forum has an 'S' with CCC's and decats and he is in S.London.

His car is V loud, loud enough to hear his car over mine with CCC's on the motorway when i've followed him. Ear splitting when driving it.

HTH

[dell]

could some one tell me where to buy the de-cat pipes ? thanks

[NTEL]

dell said:

could some one tell me where to buy the de-cat pipes ? thanks

errrr hem YHM

Edited by NTEL on Friday 11th April 14:53

[Whitey]

my car with standard bore exhaust, decats and CCC's is very loud but really only when over 3000 rpm or nailing it. At idle and normal driving, motorways too it's only about 20% louder than with CCC's and cats.

It certainly does sound mean, all hell breaks loose when you nail it and it makes some incredible pops and bangs decelerating when the exhaust is hot. It does not amuse the handbrake.

The S with a larger bore exhaust is louder and deeper sounding, I compared an S with CCC's and cats and my car with CCC's and cats and that was our verdict, so decatted it's bound to be a good bit louder.

Which would be fine by me

[BigJL]

Ok, my mind is made up...

I don't care how much it'll pee the neighbours off or how much the girlfriend is gonna hate it (she think it's too loud at the moment!), I MUST get it done!

[NTEL]

BigJL said:

Ok, my mind is made up...

I don't care how much it'll pee the neighbours off or how much the girlfriend is gonna hate it (she think it's too loud at the moment!), I MUST get it done!

YHM