Make a donation

Author Topic: Is a sport cat legal?  (Read 4281 times)

Offline rcrisp11

  • Taking part
  • ***
  • Thank You
  • -Given: 1
  • -Receive: 0
  • Posts: 33
Re: Is a sport cat legal?
« Reply #15 on: May 21, 2018, 04:15:57 pm »
Precat is for German emissions testing which has a cold start requirement.

So yes?! Haha

Offline rcrisp11

  • Taking part
  • ***
  • Thank You
  • -Given: 1
  • -Receive: 0
  • Posts: 33
Re: Is a sport cat legal?
« Reply #16 on: May 21, 2018, 06:22:27 pm »
Precat is for German emissions testing which has a cold start requirement.

So yes?! Haha

Offline pudding

  • Global Moderator
  • Just look at my post count
  • *
  • Thank You
  • -Given: 2
  • -Receive: 670
  • Posts: 8229
Re: Is a sport cat legal?
« Reply #17 on: May 24, 2018, 12:41:17 pm »
Probably more for California emissions than Europe but a cat right next to the turbo, plus a second cat, is very common on most turbo cars.   First cat heats up way faster that way and the amount of fuel these engines burn, it needs 2 cats anyway to meet the very tough cal' emissions.

I noticed bugger all deleting the first cat.  It trims EGTs down a bit at the top end but in day-day driving there was nothing appreciable on the butt dyno.


2007 ED30 | 2009 TDI 140 | 2016 BMW 330D

Offline rcrisp11

  • Taking part
  • ***
  • Thank You
  • -Given: 1
  • -Receive: 0
  • Posts: 33
Re: Is a sport cat legal?
« Reply #18 on: May 24, 2018, 08:55:57 pm »
Fair do’s. Thanks for the info :happy2: