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Sports cat #1634308
30/07/2019 11:04
30/07/2019 11:04
Joined: Dec 2005
Posts: 346
Dan Offline OP
Club member 1124
Dan  Offline OP
Club member 1124
Making a profit

Joined: Dec 2005
Posts: 346

I currently run a decat but I'm thinking of getting some kind of low-restriction cat fitted instead. I know there would be some loss of performance, but would the car run ok without remapping if I were to fit a cat? The car's currently in quite a high state of tune - around 400bhp.


Re: Sports cat [Re: Dan] #1634317
30/07/2019 14:16
30/07/2019 14:16
Joined: Feb 2008
Posts: 1,724
kj16v Offline
My life on the forum
kj16v  Offline
My life on the forum

Joined: Feb 2008
Posts: 1,724
Even a sports cat will cause quite a fair amount of restriction (and some loss of horsepower) on a turbicharged car. So you should definitely get it on the dyno to check how it runs at high load. Boost, AFR and det need to be monitored

Re: Sports cat [Re: Dan] #1634334
31/07/2019 07:08
31/07/2019 07:08
Joined: Feb 2006
Posts: 171
Czech republic
Honza Offline
On a journey
Honza  Offline
On a journey

Joined: Feb 2006
Posts: 171
Czech republic
be carefull with proper sizing of cat !

there should be BHP ceiling recomendation, from core manufaturer ... eg. 100mm diameter, 200CPSI core sport cat is suitable for 150-170bhp max, othervise serious increase of backpressure will occur, (as I had on my 2l 16v NA with 100mm dia/200cpsi universal sports cat and was able to rev up to 3500rpm/WOT without problems..., but turbo engines are not so sensitive to that.. ther will be only some lost of power...)

this backpressure could cause engine running slightly leaner...

so for 400bhp u need at least twice area of core, or smaller density... so at least 130mm+ core/100cpsi should be good for small amount of backpressure

05 15.84s
06 14,79s
07 14,9s
09 14.4s
11 lot of things to do
17 back on the road smile and much stronger

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