I don't understand....

1. Jase125 Established Member Joined: Jan 2010 Wiltshire Posts: 1381 Pug 106, Saxo vtr

   #1 9th February 2012, 18:11

   Why does some vts's backfire with full exhaust system on and just a induction kit on? Mine pops under 2k like loads when you let off but I've heard other saxos what's got the same set up and there backfiring and sometimes flames, why dosnt mine do it?!
2. Xplodee Regular Poster Joined: Dec 2011 Rochester, Kent Posts: 493 Saxo VTR

   #2 9th February 2012, 18:48

   As far as i know if you have a decat with a straight through pipe with manifold it should pop but you dont normally get flames.
3. devilsadvocate Saxperience Post Whore Joined: Dec 2006 Maidstone Posts: 8210 Golf TDI

   #3 9th February 2012, 18:58

   Flames are usually a result of overfueling iirc
4. user_34645 Saxperience Forum Bum Joined: Jun 2009 Rack City, Isle of Man Posts: 4127 GS300, MK1 VTS, Katy M 1190

   #4 9th February 2012, 18:59

   ^^ That.
   
   My old car spat flames..but the engine was fubar'd. Overfuelling, burning oil etc.
   
   My new one with the same OMP exhaust system hasn't popped a flame yet.
5. user_57322 Regular Poster Joined: Feb 2012 Posts: 334

   #5 9th February 2012, 19:37

   As other's said, it's often to do with the ECU overfueling
6. f13sta Established Member Joined: Sep 2010 loughborough Posts: 2229 1988 ford fiesta mk2 1.4- 2001 black saxo furio (d

   #6 9th February 2012, 20:14

   an ecu controlled engine should not pop flames if it is running correctly. as when you let off the accelerator it cut the injector pulse (if you still in gear)
   
   carb'ed cars pop flames simply cause it is like chucking a bucket of fuel into the cylinder so when you turn the ignition off it will still pump fuel into the cylinders cause it is done under atmostpheric pressure.
   
   besideds doing it will fuck you piston rings and therefor your engine.
7. Lewis1600 Saxperience Forum Bum Joined: Apr 2009 Los Anglesey Posts: 3416 Ibiza Sport TDI / MK1 VTS

   #7 9th February 2012, 20:19

   Overfueling.
   
   My VTR with a 4-2-1, straight through and a peco backbox was popping and banging, loud ones aswell with a spit of flame.
   
   But doing 20mph in 2nd/3rd foot all the way down, shit load of pops and bangs then it shoot off. Sounded good but wasnt any good for the engine.
8. Tom5190 Saxperience Post Whore Joined: Sep 2007 Someones Bumhole Posts: 5721 Mk2 16v Desire

   #8 9th February 2012, 20:22

   A standard mapped car shouldnt really flame to be honest but some do. Small amounts of flame arnt always bad, epic flames generally are but you use over fueling to help temperatures.
9. Jase125 Established Member Joined: Jan 2010 Wiltshire Posts: 1381 Pug 106, Saxo vtr

   #9 9th February 2012, 21:27

   Mine always smells rich of fuel when I get out do you know why that is? Mine pops but no bangs :/
10. MarcoB Newbie Joined: Jan 2010 Posts: 27

    #10 9th February 2012, 21:49

    Probably a knackered lambda sensor
11. kennym1987 Established Member Joined: Sep 2007 Armadale, West Lothian Posts: 1230 flatty 16v sleeper and a regular vts

    #11 10th February 2012, 06:01

    Quote:

    Originally Posted by MarcoB Probably a knackered lambda sensor

    this
    
    i have no lambda and since decatting it pops on gearchange
12. Ollierockk Infrequent Poster Joined: Dec 2011 Bognor Regis Posts: 117 1. MK1 Amazin VTS 2. RX-8 231

    #12 10th February 2012, 16:07

    I have a VTS with standard manifold, de-cat, silencer and ashley racing backbox and i get decent size flames....
    
    Over fuelling maybe?