I've read alot of posts saying that a de-cat can cause the turbo seals to go.

I've been wondering about some of the risks of certain mods. I heard from an ex-mechanic that by changing to a bigger exhaust you can also melt the valves is this true?

If you change what most people change (Exaust, Air filter BOV) what are you risking if that's all you change?

never heard of the bigger exhaust melting valves so i cant say if its true or not,
BOV`s atmos ones can cause the car to run rich for a few seconds and clog the cat over a long period of time , at least this is what happens on nissans!
ive always run decats but havent on the coupe yet! i never had any problems with turbo seals leaking on the other turbo cars ive had the only time i had a sealleak is when ive used oil thats to thin as it gets push past the seals as soon as it was changed back to a little thicker oil it was fine.
some people may say im wrong but im only going from my experience!

You've got to ask yourself why tho really.

There isnt any risk with putting a larger exhaust on your car. If it was an N/A it might run worse, because of reduced back pressure, but on turbo car, its only gonna affect the seals as mentioned.

Ross

lol @ Ex-mechanic he said he used to get essex boyracer cars coming in with big exhausts and they'd melted the valves. He's moved into IT like me so he can't be all that smart

Thanks for the quick replies. So fitting something like a big exaust and maybe racing cat that improves airflow (like a decat but not illegal :P) still leads to the same effect of eventually damaging the seals on the turbo? I'm guessing there's nothing you can do to prevent this other than not tinkering in the first place?

It's just something i've always wondered about. Havn't even got a coupé yet. I want a red LE but not to do anything that can lead to spoiling it.

probably they melted valves because their ECU couldn't fuel the ccar properly with a freer flowing engine and so it was detting I suppose. Would only happen on a turbo car tho

So does that mean if you do change (assuming its a turbo) your BOV your Air filter and your exhaust you really ought to get the chip remapped? Or could you even use a getec?

ive de-cat my 20vt with a standard turbo for about 3 months and my seals seem to be ok so far

no not really,but if you start fitting bigger turbo's uping the boost thats when you'll want to fit a gtech or simular, you'll want to get fueling checked to be on the safe side anyway

There's a lot of headroom on the fuelling of a std 20VT and it has an adaptive ECU. That's not true of a lot of other turbo cars.

So in short theres not a lot that can go wrong if i just add a K&N filter a Blueflame exhaust and a SSQV to the car?

just do it mate, it's only breathing and it's not a two stroke .
as said above the car runs rich as standard so you won't have any problems, although i'm not to sure about the idle with an ssqv fitted??

no not really , your just improving the breathing side of your car as already said

if you look at my exhaust1
exhaust2
exhaust3
i never damage anything but very noisy.

I hear that using an atmo BOV can leak oil. Is that true?

Whats the pro/cons of an atmo vs recirc BOV?

Yes it can, but this is down to the oil vapour circuit used on the engines. The oil vapour cannot vent to atmosphere, so it is recycled back into your boost pipes which finds it way to your engine. In doing so, the pipes are lined with oil, so when the dunmp valve goes, it will be blowing a little oil out of it.

Worried now

there have been reports of exhausts with some sort of heat retention coating - ceramic coating, hi-temp wrap - causing valves to melt due to the retained heat in the exhaust manifold conducting into the engine head and the valves itself.

redd

Skip the K&N filter and you are correct.. In the long run, a clogged AirMassmeter IS one of the most dangerous features, especially if you've been pushing the HP's a bit further by then.

like it a lot avinash

ought to get a group buy going on them lol