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Decat Advice Please #633621
21/06/2008 15:38
21/06/2008 15:38

N
nathanholmes
Unregistered
nathanholmes
Unregistered
N



Hi, ive been searching for info on this with little success. I have a 20vt with standard turbo.

Would a decat pipe damage my turbo or any other engine part?

I was looking at a supersprint decat but now have been offered a custom pipe, is there any floors with this.

many thanks

Re: Decat Advice Please [Re: ] #633624
21/06/2008 15:44
21/06/2008 15:44

D
devbod
Unregistered
devbod
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D



Standard turbos dont seem to last long with a decat. Search on here for '+turbo +decat' and it should throw up some previous experiences. Upgraded bearing is needed for longer life.

Re: Decat Advice Please [Re: ] #633625
21/06/2008 15:46
21/06/2008 15:46

B
Bigtop
Unregistered
Bigtop
Unregistered
B



apparently so
i bought my decatted coupe with a supersprint and decat about 3 months ago and it seemed ok, but since has started smoking a bit.
now i dunno if its the turbo or if its something else, but it is getting worse, just bought a cat from someone on here for MOT time.
seems they dont like the lack of backpressure from having no cat or something like that

Re: Decat Advice Please [Re: ] #633635
21/06/2008 15:56
21/06/2008 15:56

N
nathanholmes
Unregistered
nathanholmes
Unregistered
N



thats a shame, really facied the sound and power advantages but im not prepared to risk the turbo \:\(

Re: Decat Advice Please [Re: ] #633640
21/06/2008 16:01
21/06/2008 16:01

B
Bigtop
Unregistered
Bigtop
Unregistered
B



well i suppose if you get uprated bearings in your turbo, then fit the decat, it should be ok.
i think
i dunno what to do myself, might put the cat back on but if the turbos on its way then may as well get it reconned with better bearings and leave the car decatted
dont know what difference there will be between decatted and normal.

Re: Decat Advice Please [Re: ] #633642
21/06/2008 16:05
21/06/2008 16:05

N
nathanholmes
Unregistered
nathanholmes
Unregistered
N



is upgrading the bearings a big job? expensive?

Re: Decat Advice Please [Re: ] #633673
21/06/2008 16:41
21/06/2008 16:41
Joined: Jun 2007
Posts: 4,596
Malaysia..Glasgow at heart
Kelv27 Offline
Forum is my job
Kelv27  Offline
Forum is my job

Joined: Jun 2007
Posts: 4,596
Malaysia..Glasgow at heart
I think it would cost around £300-£400.

Re: Decat Advice Please [Re: Kelv27] #633802
21/06/2008 20:59
21/06/2008 20:59

M
MattW
Unregistered
MattW
Unregistered
M



You want a 360 degree thrust bearing and staggered oil seals then it should be fine with a decat (apparently).

The difference... well apart from being a lot louder, \:D Mine is kind of boomy at around 3000 rpm which is a downside, if I put the cat on it sounds smooth and creamy, with the decat it's more of a deep warbly roar with a raspy edge to it \:# \:# \:#

I got the Blueflame 2.75" full system by the way, and would recommend it to anyone.

Re: Decat Advice Please [Re: ] #633832
21/06/2008 22:11
21/06/2008 22:11
Joined: Jun 2007
Posts: 391
stoke-on-trent
R
redinstead Offline
Making a profit
redinstead  Offline
Making a profit
R

Joined: Jun 2007
Posts: 391
stoke-on-trent
you will definatley need stagger seals fitted wich offers a total seal reducing oil loss
will cost £150 to have fitted or £280 for full rebuild inc 360 bearing
thanks rob


still a 5 cylinder 20vt freak lol
Re: Decat Advice Please [Re: redinstead] #633833
21/06/2008 22:13
21/06/2008 22:13

B
Bigtop
Unregistered
Bigtop
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B



so if i send my turbo off thats how much it will be to make it de-cat-proof?

Re: Decat Advice Please [Re: ] #633916
22/06/2008 00:08
22/06/2008 00:08

M
MattW
Unregistered
MattW
Unregistered
M



IF that's all it needs, yes. If it needs a new journal bearing as well it will be more.

Re: Decat Advice Please [Re: ] #633929
22/06/2008 00:32
22/06/2008 00:32

B
Bigtop
Unregistered
Bigtop
Unregistered
B



so anyone know what the actual bhp gain is from removing the cat?

Re: Decat Advice Please [Re: ] #633933
22/06/2008 00:38
22/06/2008 00:38

M
MattW
Unregistered
MattW
Unregistered
M



Just guessing... 5-10 more bhp and 50-100 rpm better spool up?


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