De-Cat Affect on Fuel Economy

1. user_50058 Infrequent Poster Joined: Jan 2011 Southampton Posts: 172 Mauritius Blue VTR

   #1 27th April 2011, 17:01

   Approx how much does a de cat affect VTR fuel economy?
   
   I know its quite a difficult querey to answer but just a rough idea would be appreciated.
   
   Thanks
2. Nathan-HxC Established Member Joined: Aug 2010 Bath, South West Posts: 1081 16v VTR

   #2 27th April 2011, 17:07

   I get about 80 miles to £15 in my VTR, but I think I've got a blow in my exhaust somewhere as it sounds really air-y from the front windows!
   
   That's with a full Supersprint system, including decat pipe, standard manifold though.
3. user_50058 Infrequent Poster Joined: Jan 2011 Southampton Posts: 172 Mauritius Blue VTR

   #3 27th April 2011, 17:51

   Quote:

   Originally Posted by Nathan-HxC I get about 80 miles to £15 in my VTR, but I think I've got a blow in my exhaust somewhere as it sounds really air-y from the front windows! That's with a full Supersprint system, including decat pipe, standard manifold though.

   Cheers mate, that doesnt seem far off what I am getting atm with a standard exhuast.
4. Nathan-HxC Established Member Joined: Aug 2010 Bath, South West Posts: 1081 16v VTR

   #4 27th April 2011, 18:11

   Quote:

   Originally Posted by JBrown92 Cheers mate, that doesnt seem far off what I am getting atm with a standard exhuast.

   I try to drive economically most of the time too, but do like to give a bit of go in the 60's
5. devilsadvocate Saxperience Post Whore Joined: Dec 2006 Maidstone Posts: 8210 Golf TDI

   #5 27th April 2011, 18:14

   I have a decat on the GTI but it came like it so can't compare
   I can scrape 140 miles out of £20 if motorway miles
   Usually about 115 miles combined and 90-100 miles if town driving
6. Stevo123 Established Member Joined: Apr 2009 Redcar Posts: 1971 2000 Posi Blue vtr

   #6 27th April 2011, 18:59

   As always depends on how you drive, I had a decat on my Mk1 and the mpg was either the same or very slightly worse - like 15miles less to a full tank if that.
7. user_50058 Infrequent Poster Joined: Jan 2011 Southampton Posts: 172 Mauritius Blue VTR

   #7 27th April 2011, 19:30

   Quote:

   Originally Posted by Nathan-HxC I try to drive economically most of the time too, but do like to give a bit of go in the 60's

   I tend to do the same tbh, I drive economically then ill get the erge to give it some every so often.
   
   

   Quote:

   Originally Posted by devilsadvocate I have a decat on the GTI but it came like it so can't compare I can scrape 140 miles out of £20 if motorway miles Usually about 115 miles combined and 90-100 miles if town driving

   Thats what I would hope for tbh and yours is a 16v aswell so I may even get more.
   
   

   Quote:

   Originally Posted by Stevo123 As always depends on how you drive, I had a decat on my Mk1 and the mpg was either the same or very slightly worse - like 15miles less to a full tank if that.

   thanks mate, I always thought that it made quite a large difference but obviously not, defintaly tempted now!
   
   Thanks guys
8. Saxotim Saxperience Forum Bum Joined: Nov 2007 Leeds Posts: 2865 172 Cup, Mk2 VTR

   #8 27th April 2011, 19:47

   I get 3mpg more now its decatted.
9. Slugshead Established Member Joined: Jan 2009 Cardiff Posts: 1087 1.4 Red Westcoast Mk2 Posi Blue VTS

   #9 29th April 2011, 10:55

   No diff at all... Apart from my foot being heavier because the sound is so fricking awesome
10. VTRelite Saxperience Forum Bum Joined: Dec 2008 Gloucester Posts: 3000 Citroen Saxo VTR Renault 5

    #10 29th April 2011, 11:04

    mk1 shouldnt make a difference as there's only one lambda sensor anyway and that is before the cat
11. Manu Saxperience Addict Joined: Dec 2009 Posts: 11714 A6 Le Mans tuned/A3 TFSI tuned

    #11 29th April 2011, 11:28

    how long is a piece of string will depends on how heavy is your right foot.
    
    

    Quote:

    I get about 80 miles to £15 in my VTR

    that's terrible.
12. devilsadvocate Saxperience Post Whore Joined: Dec 2006 Maidstone Posts: 8210 Golf TDI

    #12 29th April 2011, 11:32

    Quote:

    Originally Posted by Manu how long is a piece of string will depends on how heavy is your right foot. that's terrible.

    Heavy foot combined with town miles it's belieable
    
    £15 is only about 11 litres so roughly 33mpg