Vts mods help

1. Atbracing Newbie Joined: Oct 2012 Posts: 14

   #1 21st July 2013, 18:22

   Hi I've got a 02 vts rallycross car which has had new forged racing pistons and a PT52 cam upgrade. Car has a fuel regulator upgraded fuel pump but the car is running like a bag of poo.
   
   Very lumpy on idle and no difference in speed at all. It also has 4-1 race manifold and black diamond clutch.
   
   It has a chip wizards ECU do you think this needs re mapped to go with the upgrades or what other problems do you think is causing this
   
   Cheers
   
   Adi
2. SlickandQuick Infrequent Poster Joined: Jun 2013 West Lothian Posts: 109 Citroen Saxo VTR - 2002. Makes all the birds cream

   #2 22nd July 2013, 13:41

   Been told that upgraded cams can cause the car to idle differently? Correct me if I'm wrong
3. Sexysaxojames Infrequent Poster Joined: Nov 2012 Crawley Posts: 158 Saxo vts

   #3 22nd July 2013, 15:41

   ive bought cat cams 743 for my vts, been told i need to remap otherwise will do what your saying yorus is doing... so my bet is remap so all the settings for fuel etc are set up properly..
4. user_39461 Super Moderator Joined: Nov 2009 Cambridge(ish), UK. Posts: 10581 BMW 5x M50d.

   #4 22nd July 2013, 15:44

   100% will need a remap. You've upped the fuel pressure and changed cam timing but haven't altered the map to suit. It'll be overfueling and underfueling all over the shop.
   
   Get it remapped
5. Saxdaniel Infrequent Poster Joined: Mar 2013 Ramsgate Posts: 111

   #5 22nd July 2013, 17:01

   Pretty sure your meant to remap after most engine mods?
   
   Correct me if I'm wrong.
   
   
   Sent from my iPhone using Tapatalk
6. wullvfr Established Member Joined: Jan 2009 killin,perthshire Posts: 1561 Audi a3 1.8sport,kawasaki zx9r c2,Yamaha R1 track

   #6 22nd July 2013, 21:59

   Defo remap.........your best doing that anyway to get the best from your mods even if it were idling not too badly.
7. Atbracing Newbie Joined: Oct 2012 Posts: 14

   #7 23rd July 2013, 17:03

   According to the people that did the mods it shouldn't need a re map but these same people drilled 2 holes in the inlet manifold flap to what they said" get more air in for it idling".
   
   Oh they also wrecked my first head when they changed the cams because no one told them that PT52 cams would have the right clearance with standard pistons and would need change. Surely someone fitting these cams all the time and portray themselves as experts in saxo would have known that or am I just expecting to much