de-cat how much louder?

For those of you not faint of heart, who believe the Volvo 480 should have more torque and horsepower, find all you need to know in here.

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ovlov 480
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de-cat how much louder?

Post by ovlov 480 » Sat Sep 02, 2006 9:37 am

I'm seriousley considering a de-cat but I like the fact that I can do 100mph and still be able to listen to the stereo (not that I would do that sort of speed!) how much louder is it? I would'nt mind a bit of extra growl but when I put a de-cat on my old 106 rallye it was soooooooo loud. any advice appreciated
91' 480 turbo manual

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Murf
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Post by Murf » Sat Sep 02, 2006 2:39 pm

doesnt really make a difference to the noise, you can hear the turbo a bit more though, which is cool :)
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ovlov 480
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how much more power

Post by ovlov 480 » Sun Sep 03, 2006 3:35 pm

I like the sound of that! :D so what can I expect power wise 10bhp and slightly quicker spool up?
91' 480 turbo manual

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Post by catgroom » Sun Sep 03, 2006 4:34 pm

Not sure on BHP,it just feels like someones freed yer engine up,it breathes out much more quickly,as is not restricted.

A de-cat pipe is best.If you were going to just knock the insides through on a 480 cat,it works well,but apparently theres turbulance in the cat box.It was designed to have insides,so a puropse built one is best for flow efficiency.

Yep my Turbo sounds nice through it too!You will need to put your cat back on for MOTs though dont forget!

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I'm No Longer Here :(

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Post by Murf » Mon Sep 04, 2006 7:36 pm

You will need to put your cat back on for MOTs though dont forget!
Only if your scared of electrical problems and rust and bought a late model turbo :D
If you own a pre K reg turbo then go kick your cats insides out, right now :)
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pol
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Post by pol » Mon Sep 04, 2006 8:07 pm

Not much difference in volume, make's it sound more renault like to me for some reason. Reminds me of how a friends 1.7gtx R5 sounded. I like it anyway and yes, you hear the turb spooling better.

pol

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Post by robin_xr4i » Tue Sep 05, 2006 7:30 am

Murf wrote:......go kick your cats insides out, right now :)
thats a bit mean!
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cruelty to cats

Post by ovlov 480 » Tue Sep 05, 2006 5:06 pm

yeah mines a '91 so it gets tested as a non cat. a local company are going to make me one up for 35 squids then i'm going to smash my cat with a sledgehammer!
91' 480 turbo manual

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Post by aibast » Tue Sep 12, 2006 5:28 am

De-cat'ed my 744. The result was a bit higher exhaust note but way faster turbo spoolup. A fix for a louder note for me was a sports straight trough 3" resonator instead of Cat. Gives nice smooth constant exhaust note and almost doesn't affect performans.
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kitt
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Post by kitt » Wed Sep 13, 2006 9:44 pm

Why dont you try a sports cat - the airflow is much better and it will pass MOT with no probs!! :D

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Post by robin_xr4i » Thu Sep 14, 2006 12:51 pm

kitt wrote:Why dont you try a sports cat - the airflow is much better and it will pass MOT with no probs!! :D
Expensive thou......

P.S. You avatar might be a little big :D
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Post by muddyfox470 » Tue Apr 17, 2007 3:37 pm

can you de-cat a 2litre?
saves having to replace it when it goes booboo.

what sort of changes with respect to the emissions would it make, i.e. as said above about mot's etc.

cheers

ian

ps. yes i know about the age of the thread, i just thought it pointless creating a new one :)
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Re: de-cat how much louder?

Post by Matthew Brennan » Tue Apr 17, 2007 3:52 pm

ovlov 480 wrote:I'm seriousley considering a de-cat but I like the fact that I can do 100mph and still be able to listen to the stereo (not that I would do that sort of speed!) how much louder is it? I would'nt mind a bit of extra growl but when I put a de-cat on my old 106 rallye it was soooooooo loud. any advice appreciated
The answer is 12

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Post by robkendall » Tue Apr 17, 2007 4:52 pm

ian on a serious note....yes you can de-cat a 2 ltr
same rules apply though.....if before 91/92, then youre ok, if after mot issues.

be aware though that with a turbo, the quicker you get the gas out the better....with an NA car, you do need some back pressure, and this will remove that, so performance wise could actually be worse.....ive had two b18ep's (ok, not 2 ltr, but same applies i think)....one made a massive difference in breathing, and felt smoother and flowed better....the other ran like murfs kicked cat.....well, but hobbled and jerky
rgrds
rob
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Post by muddyfox470 » Tue Apr 17, 2007 4:58 pm

robkendall wrote:ian on a serious note....yes you can de-cat a 2 ltr
same rules apply though.....if before 91/92, then youre ok, if after mot issues.

be aware though that with a turbo, the quicker you get the gas out the better....with an NA car, you do need some back pressure, and this will remove that, so performance wise could actually be worse.....ive had two b18ep's (ok, not 2 ltr, but same applies i think)....one made a massive difference in breathing, and felt smoother and flowed better....the other ran like murfs kicked cat.....well, but hobbled and jerky
rgrds
rob
cheers for the reply rob

the car is a 93 2litre so thats what i was thinking about with the mot and all...
just seems a bit mad to have to by a cat for the sake of it when they decide to go kapputt, how much do they cost? £150 or more :cry:

im not thinking about it immediately im just thinking of it for the near future :)

cheers

ian
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Post by 98kellrs » Wed Apr 18, 2007 12:50 am

Yeh on a N/A you'll notice the idle going a bit lumpy and the car won't drive as smoothly anymore. I've just done it to mine and I'm currently not happy with how the car has responded.

The power increase is minimal with de-cat, mine now feels less responsive at low revs, although better in higher rev ranges. IMHO I'd say that 2ltrs shouldn't be modified power-wise, nothing is really cost effective, by all means change the air filter, or change your cat for a sports version but thats about all i think you can do and even they have minimal results.

In fact, probably the most cost effective thing to do with a 2ltr to make it speedier would be to paint some giant go-faster stripes on it! ;)
Ryan.

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Post by robkendall » Wed Apr 18, 2007 6:41 am

the best results for 'decatting' on an NA i found were....

remove cat from car and with an airline, blow all the shite out of the cat....all the deposits etc....but tape a bag to the other end...the gubbings allegedly have a half life of a millenium or so.
then if you can get a large drill bit, drill a hole through the ceramic honeycomb inside....i did a 22mm hole in mine.....i found it enough to allow breathing, but not so much to lose the back pressure etc.

alternatively ive heard of people smashing the crap out altogether, then putting a piece of pipe striaght through and welding.....it looks like a cat from the outside, but is a striaght pipe inside....not sure how that would affect the lambda though, as it wouldnt be reading any kind of exhaust fumes etc.
rgrds
rob

it does seem to be a suck it and see thing.....get a scrappy cat and play with that....if its shite, you can put the original one back on, no harm, no foul.
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Post by 98kellrs » Thu Apr 19, 2007 9:10 am

Well even if it looks like a CAT, but isn't, it'll fail the MOT on emmissions test anyway...?
Ryan.

1992 480 ES, 110k, Paris blue, custom SS side-exit exhaust, De-catted, custom fibreglass lightweight bonnet, custom fibreglass front spoiler, stripped interior, Slate Black textured metal paint throughout, Cobra Imola S drivers Seat, Ricco 4 point 3 inch harness, Magnecor KV85 leads.

Current Status: A very impressive track car. :-D

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