de-cat on a gsi - Corsa Sport - for Vauxhall and Opel Corsa B, Corsa C and Corsa D

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gsirick

Member

Registered: 18th Feb 07
Location: mid-wales
User status: Offline

25th Jan 08 at 20:06

would i benefit anything if i fitted a de-cat to my gsi?
ive got a stainless cat back system and a 4 into 1 exhaust manifold.

[Edited on 25-01-2008 by gsirick]

Richardhhha

Member

Registered: 29th Sep 07
Location: Croydon, Greater London
User status: Offline

25th Jan 08 at 20:19

mid range is inproved but not much really, had a decat and then a sport cat on my X14XE and it was nice, just put the standard system back on and its missing the midrange get up and go.

gsirick

Member

Registered: 18th Feb 07
Location: mid-wales
User status: Offline

25th Jan 08 at 20:28

ive only ever had a de-cat on my saxo vtr and i noticed quite a difference even when i went for a straight threw system. a mate of mine had a hollow cat on his gsi and he said when he fitted a new cat he did notice a difference.
the only problem i have is having the 4 into 1 manifold ive had a reducer welded onto the cat to make it bigger so it connects to the manifold.
think if i get one i mite go back to a standard manifold.

[Edited on 25-01-2008 by gsirick]

Steve X16XE

Member

Registered: 31st Dec 06
Location: Barnsley, South Yorkshire
User status: Offline

25th Jan 08 at 20:32

I feel it's more at the top end. When it was time for MOT, driving around, i couldn't redline in 2nd, where as with out the cat it'll redline in 4th or 5th very easy.

gsirick

Member

Registered: 18th Feb 07
Location: mid-wales
User status: Offline

25th Jan 08 at 20:34

quote:
Originally posted by Steve X16XE
I feel it's more at the top end. When it was time for MOT, driving around, i couldn't redline in 2nd, where as with out the cat it'll redline in 4th or 5th very easy.

would i be better off doing away with the 4 into 1 manifold if i get a de-cat?

Steve X16XE

Member

Registered: 31st Dec 06
Location: Barnsley, South Yorkshire
User status: Offline

25th Jan 08 at 20:39

Noooooooooo

Keep that on.

I has a protec 4-1, Decat, standard middle, then a bigger BB.

On the rollers it made 114.4 BHP.

Even then i could just about get past my mate who has a C2 VTS.

Then stick a mantzel on it and it now has 125.2 BHP.

gsirick

Member

Registered: 18th Feb 07
Location: mid-wales
User status: Offline

25th Jan 08 at 20:49

quote:
Originally posted by Steve X16XE
Noooooooooo

Keep that on.

I has a protec 4-1, Decat, standard middle, then a bigger BB.

On the rollers it made 114.4 BHP.

Even then i could just about get past my mate who has a C2 VTS.

Then stick a mantzel on it and it now has 125.2 BHP.

im having problems with the lamber sensor on the manifold, the one onit has got wet (due to where it plugs into the manifold it is where the cat joins the manifold) and the standard sensor doesnt seem to work.

Steve X16XE

Member

Registered: 31st Dec 06
Location: Barnsley, South Yorkshire
User status: Offline

25th Jan 08 at 21:22

Tryed a replacement? Scrappers or AutoVaux?

Ring AutoVaux coz there isn't much on their website. 01924 376003 (i can now remember their number now coz i ring them up sooooo much

)

Robin

Premium Member

Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline

26th Jan 08 at 00:03

quote:
Originally posted by Steve X16XE
I feel it's more at the top end. When it was time for MOT, driving around, i couldn't redline in 2nd, where as with out the cat it'll redline in 4th or 5th very easy.

WTF, there's something wrong with your car then Steve

Steve X16XE

Member

Registered: 31st Dec 06
Location: Barnsley, South Yorkshire
User status: Offline

26th Jan 08 at 00:23

Must be.

It would redline in 2nd if i held it in that gear for long enough. But without the cat i could just do it in 4th for poops and giggles all day long.

Robin

Premium Member

Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline

26th Jan 08 at 00:33

It's should do it in all but 5th regardless of if it has a cat.

Steve X16XE

Member

Registered: 31st Dec 06
Location: Barnsley, South Yorkshire
User status: Offline

26th Jan 08 at 00:38

quote:
Originally posted by Robin
It's should do it in all but 5th regardless of if it has a cat.

Naa, mine wouldn't.

Pre inlet, without the cat. It'd redline 5th.

Superlite Ltd.

Member

Registered: 9th Jan 07
User status: Offline

26th Jan 08 at 08:38

I'd do it

Didn't notice alot of difference on mine, but like steve said, the revs pulled round to the limiter easier than before.

gsirick

Member

Registered: 18th Feb 07
Location: mid-wales
User status: Offline

26th Jan 08 at 13:38

have got a magnex de-cat onits way. just need to get my hands on a welder to fit a reducer so it marrys up to the manifold. also have got an ntk lamber sensor and have found out that i have a protech 4 into 1 exhaust manifold. it goes like the clappers without the lamber sensor for some reason and i have no faults on the ecu