Lurch Posted March 18, 2010 Share Posted March 18, 2010 Hello, I wonder if anyone can help me with a problem I've got. When I accelerate at full boost it judders almost like its not getting enough fuel. I'm BPU @ 1 bar boost. New sparkies, new walbro. Decat and 1bar restrictor ring. Could it be a faulty fcd? It doesn't do it when on 0.8 boost Quote Link to comment Share on other sites More sharing options...
Mike Posted March 19, 2010 Share Posted March 19, 2010 Warped discs? Quote Link to comment Share on other sites More sharing options...
Dnk Posted March 19, 2010 Share Posted March 19, 2010 Warped discs? Quote Link to comment Share on other sites More sharing options...
trinitom Posted March 19, 2010 Share Posted March 19, 2010 did you fit the right sparks? right gap? Quote Link to comment Share on other sites More sharing options...
Dnk Posted March 19, 2010 Share Posted March 19, 2010 Do you have a boost gauge ? whats it boosting to ? What FCD have you got ? Quote Link to comment Share on other sites More sharing options...
miko_supra Posted March 19, 2010 Share Posted March 19, 2010 Warped discs? You got enough fuel? When mine is on the warning light and I floor it it will judder and cut. Quote Link to comment Share on other sites More sharing options...
Lurch Posted March 19, 2010 Author Share Posted March 19, 2010 did you fit the right sparks? right gap? Yea I've got colder plugs, NGK BCPR7ES Do you have a boost gauge ? whats it boosting to ? What FCD have you got ? Just went out to check, as I wasn't sure and I noticed this... (not my photo but same item) Would this be the reason, does it need to be adjusted or mapped? I dont even know what it is lol. Tried researching but could only find the f con v pro which I do believe is different? yea I have got a boost controller, its running 0.97 bar of boost. (just under a bar) You got enough fuel? When mine is on the warning light and I floor it it will judder and cut. Yea lots of fuel, it does feel as though it has something to do with fuel though. Quote Link to comment Share on other sites More sharing options...
miko_supra Posted March 19, 2010 Share Posted March 19, 2010 Thats a piggy back. Have a go at removing that unit and just going through the stock ecu and see what happens. If its that ecu I don't think there are many places that can map them in this country as I have the same fitted. Yea I've got colder plugs, NGK BCPR7ES Just went out to check, as I wasn't sure and I noticed this... (not my photo but same item) http://i.ebayimg.com/14/!BkW55Kw!mk~$(KGrHqYOKigEsm+VcgY7BL(MD5ebY!~~_35.JPG Would this be the reason, does it need to be adjusted or mapped? I dont even know what it is lol. Tried researching but could only find the f con v pro which I do believe is different? yea I have got a boost controller, its running 0.97 bar of boost. (just under a bar) Yea lots of fuel, it does feel as though it has something to do with fuel though. Quote Link to comment Share on other sites More sharing options...
RobSheffield Posted March 19, 2010 Share Posted March 19, 2010 Its a fuel and ignition piggyback. Most are locked and unmappable. Quote Link to comment Share on other sites More sharing options...
Lurch Posted March 19, 2010 Author Share Posted March 19, 2010 So its worthless to me then. I shall unplug and take it for a spin, cheers Quote Link to comment Share on other sites More sharing options...
RobSheffield Posted March 19, 2010 Share Posted March 19, 2010 It depends how its been set up, safe or unsafe. Best bet would be to unplug it and take a few steady runs, see how it drives, see if it judders. Watch the boost though. I would say an hour on the dyno, runs with and without it plugged in would tell you if its safe or not. Quote Link to comment Share on other sites More sharing options...
Lurch Posted March 19, 2010 Author Share Posted March 19, 2010 Just took it for a spin and it runs alot nicer without it. no juddering. Only fuel cut. Luckily I've got a FCD that I can fit, so shall do that. Can it be mapped at all in the u.k? Quote Link to comment Share on other sites More sharing options...
Terminator Posted March 19, 2010 Share Posted March 19, 2010 Yes it can be mapped in the UK, ask Ryan. Quote Link to comment Share on other sites More sharing options...
RobSheffield Posted March 19, 2010 Share Posted March 19, 2010 Yes it can be mapped in the UK, ask Ryan. Phil, i thought the Fcon V couldn't be mapped? IS that a 'only if its locked' situation? Quote Link to comment Share on other sites More sharing options...
Terminator Posted March 19, 2010 Share Posted March 19, 2010 I thought they all could be "unlocked" if you know how. I could be wrong. May be they have to be rest to 0 settings and mapped a fresh. It is certainly worth asking. Quote Link to comment Share on other sites More sharing options...
Lurch Posted March 19, 2010 Author Share Posted March 19, 2010 Yes it can be mapped in the UK, ask Ryan. P.M'd Quote Link to comment Share on other sites More sharing options...
Lurch Posted March 20, 2010 Author Share Posted March 20, 2010 Ryan said it can be mapped, but if its locked would have to start from scratch Quote Link to comment Share on other sites More sharing options...
imi Posted March 20, 2010 Share Posted March 20, 2010 Ryan said it can be mapped, but if its locked would have to start from scratch Is there much benefit to be gained to use a piggyback like this on a BPU? Quote Link to comment Share on other sites More sharing options...
paulj1 Posted March 20, 2010 Share Posted March 20, 2010 I got mine mapped at Abbey motorsport but couple of other places do them now Quote Link to comment Share on other sites More sharing options...
Lurch Posted March 20, 2010 Author Share Posted March 20, 2010 Is there much benefit to be gained to use a piggyback like this on a BPU? I asked Ryan this, so should get a response soon... Quote Link to comment Share on other sites More sharing options...
trinitom Posted March 20, 2010 Share Posted March 20, 2010 Is there much benefit to be gained to use a piggyback like this on a BPU? there is always gains to be made over the stock ecu, better response, better fuel economy, no lean spots over turbo transition, and a few hp more. Quote Link to comment Share on other sites More sharing options...
RobSheffield Posted March 20, 2010 Share Posted March 20, 2010 I had the Fcon V on my car when it was BPU (it was on it when imported, and i didnt know until i removed carpets for painting) and every other TT or BPU TT owner i ever took for a drive commented how fast it was. If you change fuelling and ignition you can change the spool characteristics. When 2nd turbo came in when mine was BPU it felt insane. No juddering or issues though. IIRC, dont they also have a crude FCD effect? So maybe you fitting another may have confused it and led to juddering? Quote Link to comment Share on other sites More sharing options...
Lurch Posted March 20, 2010 Author Share Posted March 20, 2010 No, it didnt have a FCD. It was the f-con that stopped the fuel cut. Quote Link to comment Share on other sites More sharing options...
RobSheffield Posted March 20, 2010 Share Posted March 20, 2010 No, it didnt have a FCD. It was the f-con that stopped the fuel cut. Im not sure i follow. Im pretty sure the juddering wasnt fuel cut, the feeling you get with fuel cut isnt a judder, but more of a 'head through the screen' type thing! All i can say is my car was BPU, Had an FconV, didnt have an FCD, boosted to 1.2bar, and didnt hit cut. Quote Link to comment Share on other sites More sharing options...
Lurch Posted March 20, 2010 Author Share Posted March 20, 2010 Sorry, lazy typing again. What I mean is that I didnt have an FCD and F-con ecu together like you thought I did. I assumed I had a FCD as my car never hit boost cut until I had a look and found the f-con. So the juddering wasn't caused by a conflict of having and FCD and the F-con ECU. But its hitting boost cut now as I've removed the F-Con but the juddering has stopped. I luckily have a FCD to fit. Hope that makes sense, I'm rubbish at explaining things Im not sure i follow. Im pretty sure the juddering wasnt fuel cut, the feeling you get with fuel cut isnt a judder, but more of a 'head through the screen' type thing! All i can say is my car was BPU, Had an FconV, didnt have an FCD, boosted to 1.2bar, and didnt hit cut. Quote Link to comment Share on other sites More sharing options...
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