Decat with standard backbox ?

1. VTR-Alex L-plater Joined: Mar 2009 Telford Posts: 30 Saxo VTR , R1 Powered Kit car ;)

   #1 15th May 2009, 18:35

   Hi, i had a straight through centre section laying around so i fitted it to my Mk1 VTR and it feels slightly slower if anything
   
   It is still using the standard VTR backbox, but has no silencer or cat.
   
   However when i measure 0-60 times and stuff they are reading 8.5 secs (which by time is reaches actual 60mph is around 9.2 secs) so i think its just the throttle response that has been lost I read somewhere that straight through system can help with BHP but lose some torque, is this true ?
   
   And would fitting an aftermarket backbox help this ?
   
   Many thanks, Alex
2. user_16747 Banned Joined: Jul 2007 Posts: 4328

   #2 15th May 2009, 19:20

   will be down to back pressure
3. LeeBBH Frequent Poster Joined: May 2009 Maidstone Posts: 860 Mk6 Fiesta Zetec S

   #3 15th May 2009, 22:01

   im with swampy on that one!
4. VTR-Alex L-plater Joined: Mar 2009 Telford Posts: 30 Saxo VTR , R1 Powered Kit car ;)

   #4 16th May 2009, 15:20

   Thanks guys .
   
   But do i need more back pressure, or less ?
   
   I dont know if the gas is flowing quickly through the system, and then gettin all stuck up when it reaches the backbox :/