port and polish throttle body vtr

1. user_18516 Established Member Joined: Oct 2007 Posts: 1743

   #1 18th February 2008, 22:23

   i took the restriction bar off my butterfly over the weekend to see if this gave me any more power/throttle response. it defatatly made some sort of difference so im going to bore and polish it out myself. just wondering what would be the best tools to use to bore my throttle body out more.
   
   i used a dremel to take the bar from the butterfly, and was wondering if this would be the best thing to use.
   
   if any one has done this themselves could they give me some info
   
   will rep for usefull info
   
   cheers
2. leeK9 Established Member Joined: Feb 2007 letterkenny,donegal,ireland Posts: 1338 citroen saxo VTS

   #2 18th February 2008, 22:26

   dont know much about doing this but make sure you still have a good seal on the butterfly or else your car will idle bad and stall
3. user_18516 Established Member Joined: Oct 2007 Posts: 1743

   #3 18th February 2008, 22:28

   yeah i know mate im going to keep the cicumfrence around the butterfly the same,
4. RCD-Performance Established Member Joined: Dec 2007 Southampton Posts: 2278

   #4 18th February 2008, 22:31

   if the circumfrence around the butterfly is the same, the now matter how big you make the circumfrence either side of it the velocity of the air can only go to the same as it was?

   1 user thanked this post: CbVtR
5. user_18516 Established Member Joined: Oct 2007 Posts: 1743

   #5 18th February 2008, 22:36

   what i was meaning was im gonna bore and polish the throttle body but not to the extent that i have to change the butterfly. what are the best toolsto use?
6. RCD-Performance Established Member Joined: Dec 2007 Southampton Posts: 2278

   #6 18th February 2008, 22:55

   dremel i suppose mate. Just thinking that if you bore it you will loose the seal? If you do it so as not too loose the seal, you can hardly take any metal out?
   
   Ross
   RCD.
7. vtr130 Established Member Joined: May 2006 Posts: 2279

   #7 18th February 2008, 23:11

   Quote:

   Originally Posted by adnandunn what i was meaning was im gonna bore and polish the throttle body but not to the extent that i have to change the butterfly. what are the best toolsto use?

   I wouldnt use anything to crazy unless you have a spare a few people on here used to do them and sell them, ask spencer cammed vts i believe he has done some!
8. user_18516 Established Member Joined: Oct 2007 Posts: 1743

   #8 18th February 2008, 23:17

   think i mite just smoth the screws down and bore the first inch or so out the bit before the butterfly. Will this be worth doing?
9. vtr130 Established Member Joined: May 2006 Posts: 2279

   #9 18th February 2008, 23:22

   Yeh you would want to open the tb up and remove the restricitng metal circle thing
10. user_18516 Established Member Joined: Oct 2007 Posts: 1743

    #10 18th February 2008, 23:29

    iv alredy tacken the circle restrictor out and it gave it more response.thats why im going to bore the lip and screws to make it better
11. user_7096 Established Member Joined: Sep 2005 Market Bosworth Posts: 2482 106 XSi 1360cc

    #11 19th February 2008, 13:31

    i did mine and used a dremel and lots of sand paper!
    then some really fine sand paper
12. user_18516 Established Member Joined: Oct 2007 Posts: 1743

    #12 19th February 2008, 13:40

    how long did it take buddy and did you could you notice any improvement
13. Matty-VTR Frequent Poster Joined: Jan 2008 Cheltenham Posts: 920 Silver VTR & Gunmetal Grey VTR

    #13 19th February 2008, 21:16

    I cant see that making any power mate, i dont know why those people on ebay claim 3bhp
14. KamRacing Saxperience Addict Joined: Nov 2006 A farm shed in Aylesbury Posts: 14916 Corolla AE86 Peugeot 205 B18C (in bits)

    #14 19th February 2008, 21:33

    Quote:

    Originally Posted by RCD-Performance dremel i suppose mate. Just thinking that if you bore it you will loose the seal? If you do it so as not too loose the seal, you can hardly take any metal out? Ross RCD.

    Indeed you are right Ross
    
    

    Quote:

    Originally Posted by adnandunn i took the restriction bar off my butterfly over the weekend to see if this gave me any more power/throttle response. it defatatly made some sort of difference so im going to bore and polish it out myself. just wondering what would be the best tools to use to bore my throttle body out more. i used a dremel to take the bar from the butterfly, and was wondering if this would be the best thing to use. if any one has done this themselves could they give me some info will rep for usefull info cheers

    so dont waste your time altering it any more. Your butterfly is the limiting factor here so without fitting a larger throttlebody you are not going to gain any more from widening the rest
15. Lozza_vtr Established Member Joined: Jun 2007 Sunny Essex!! Posts: 2342 VW Golf Mk4 1.8T

    #15 19th February 2008, 22:11

    I think that enlarged throttle body's can give good gains, as long as they are bored out and fitted with a bigger butterfly.
    
    Here was my one that i have done on my last car that i owned (Vectra).
    
    
    
    Here you can see the original butterfly under the throttle body to see how much it was bored out.
    
    
16. RCD-Performance Established Member Joined: Dec 2007 Southampton Posts: 2278

    #16 19th February 2008, 22:16

    "I think that enlarged throttle body's can give good gains"
    
    You indeed may be right matey
    
    However does anyone have any proven gains for these? If they do we would be interested too hear!
    
    Ross
    RCD Performance
17. spencer_cammedvts Saxperience Forum Bum Joined: Nov 2005 MEASHAM United Kingdom (England) Posts: 3445 257bhp Ibiza Cupra Turbo

    #17 20th February 2008, 08:21

    same principle as a flowed head! you dont put bigger valves in but you still get gains!
    
    as for the vtr throttlebody. i would be VERY careful as it seals against the inlet manifold on the flat face of the throttlebody. this is the bit that you enlarge & re-shape. take to much off the throttlebody and you have a useless piece of metal in your hands!
18. RCD-Performance Established Member Joined: Dec 2007 Southampton Posts: 2278

    #18 20th February 2008, 08:24

    I just think, (until someone proves me wrong, please do) that it's a complete waste of time.
    
    Ross
    RCD Performance
19. user_7096 Established Member Joined: Sep 2005 Market Bosworth Posts: 2482 106 XSi 1360cc

    #19 20th February 2008, 23:00

    well my car will be rr'd again in 5 weeks and all ive done is the tb and stripped it more
    
    it seems more responsive but as for more power we'll find out
20. user_18516 Established Member Joined: Oct 2007 Posts: 1743

    #20 21st February 2008, 18:59

    let me know piggy123 if you gain any more power
21. Matty-VTR Frequent Poster Joined: Jan 2008 Cheltenham Posts: 920 Silver VTR & Gunmetal Grey VTR

    #21 21st February 2008, 21:16

    If someone sends me one of these ported throttle bodies that claim power i will gladly drive me car down to the garage and dyno it before and after for free.
    
    Lozza_vtr that is the way it should be done mate!