Fabia VRS CAT question?

[mod_boy]

Hi all,

How many CATs does the fabia VRS have?

The reason i ask is because i wouldnt mind a deCAT but if there is only one obviously my car wont pass the MOT emission test. I was hopeing there was 2 and i could replace one of them like i have done on a swift. Havn't had the VRS long so dont know too much about it yet as the weather aint been the best.

People who have had a straight pipe fabd in place of the CAT...what do you do when it comes to an MOT??

[ultra_joel88]

Only One.

Diesels currently don't require a CAT to pass the MOT test.

[mod_boy]

OH shame on me for not knowing that lol, it is my first diesel

that is good news then

Do people approve of a deCAt on the fab VRS or is there any hidden problems if i do?

[Jonny5ive]

Do people approve of a deCAt on the fab VRS or is there any hidden problems if i do?

Rumour has it sounds lovely

[mod_boy]

What about MPG does anyone know the effect it will have ?

[MoggyTech]

Should make do difference to MPG or performance. However the car has a VNT Turbo, and the exhaust system will be tuned for a certain amount of back pressure. People do run de-cat with no issues, but I would say the chance of turbo damage is there.

[Jim H]

I read on another forum a very good post on de-catting diesels (TurboDiesel & TDCI forums). It said that they will pass the MOT on Emissions (Not tested) but may fail on noise.

See Turbo Diesel Owners Club UK - Diesel Emissions and De-Cats

[ultra_joel88]

I have removed my CAT but retained a back box and the sound I would say is nigh on perfect.

Quiet when cruising but loud when giving it some above 3k.

I have a stage one remap and boost gauge and have not noticed anything untoward.

[mod_boy]

Has anybody had any problems with there turbo if they have a deCat?

[MoggyTech]

Has anybody had any problems with there turbo if they have a deCat?

The thing is if a Turbo fails some time after a de-cat, was it the de-cat that caused it, or just general failure. Almost impossible to tell. There's a whole host of stuff about de-cats and turbo cars, and they differ depending on if it's a diesel or petrol engine. There is exhaust scavenging to consider and that very much depends on what size pipe is used to make the new exhaust.

Environmental issues aside, a de-cat on a diesel is a good idea, provided the custom pipe work is the right diameter.

Discovering if a modification causes a problem is never easy. Well that is if it's not something like a wide angle blind spot mirror I fitted last week, which decided to fall off when I washed the car yesterday

[mark_sargeant19]

Rumour has it sounds lovely

like john deere lovely?

[mod_boy]

So do people think i should go for it :confused:

[andypandypoos]

like john deere lovely?

exactly, it'll still sounds pants. only louder :thumbdwn:

[MoggyTech]

So do people think i should go for it :confused:

Well it's legal, and takes an expensive part out of the exhaust system. I'd say go for it.

[cheezemonkhai]

If you want to get rid of the CAT then stick a de-oxidising gauze in there

[Decron]

I would suggest a map after decatting to make the most of it.

[mod_boy]

Thanks for everyones input but think i will just get a bleflame or miltek system as everyone seems a bit vague on the deCAT

[strimister]

hi all,i have just put the blue flame decat pipe and cat back system on my fabia vrs.is is well worth it and is slight burble till 2500rpm then it starts to sound like a golf vr6! ps,i have forge dumpvalve on two years and with exhaust sounds and drives amazing.it does reduse turbo lag slightly.hardly any smoke of it ether.1st mot next month aswell.hope this helps

[ultra_joel88]

hi all,i have just put the blue flame decat pipe and cat back system on my fabia vrs.is is well worth it and is slight burble till 2500rpm then it starts to sound like a golf vr6! ps,i have forge dumpvalve on two years and with exhaust sounds and drives amazing.it does reduse turbo lag slightly.hardly any smoke of it ether.1st mot next month aswell.hope this helps

Please elaborate?

All a dump valve does on a diesel is **** away a tiny bit of valuable boost so it sounds like a duck is under your bonnet - they do NOTHING to improve performance

[strimister]

it has a control box that has a adjustment screw for time it stays open.i have mine on the minimum.i disagree having driven it without one for about a year.i honestly would say it works ok with decat system.the forge valve has no rubber seals to break,just a alloy ball with interchangble springs.

ps,still get 55mpg average and 45mpg driving flat out locally!

also,the blueflame cat back system only fits blueflames front pipes!!

[djswivel]

Ok, but myself and many others (if not everyone) will tell you a dumpvalve has no benefit at all in diesel engine. Without going techinal, it's not actually possible for it provide and benefit.

Back to the de-cats, I've been running one for about 18months now and had no problems at all. It's had 2 MOT's with it and it's not even been questioned, only commented on and asking if it improved the sound!

[strimister]

thanks for that.i have had many doubhts about dv thats y i have a switch in car to bypass it wen i cant be arsed with it.

i promise i wont say i have one ever again;-[