mk3_matt 21 Posted April 12, 2015 Report Share Posted April 12, 2015 Hi guysI've just installed a turbo on a friends vr6.I fitted263 cams3mm spacer plateArp head stud kit440cc injectorsFront mount intercooler and pipe workMy question is why does it now run so rough, it's miss firing and won't Rev up.I re checked the timing today and I noticed the lower inlet manifold had little puddles of petrol in it so I changed the injectors to 315cc ones that came with the turbo kit it idles a bit smoother but still won't Rev up.Is this down to the ecu not having a map for the bigger injectors.I thought I would be able to run the car on really low boost till it gets mapped.Maybe I'm wrong. Could someone shed some light on this please.Many thanks Link to post Share on other sites
Sump_slammer 23 Posted April 12, 2015 Report Share Posted April 12, 2015 I was told that with superchargers you couldnt run the red injectors until it had been maped because it flood out. Thats what vince told me from stealth. Try the standards in there and see what youve got. Did you use a 2mm head spacer and two metal head gaskets? Or a 3mm spacer and two head gaskets? Ive read on here people had run them with bigger injectors and low boost. But then again you never know whats true or fairy land school boy talk on forums these days. Link to post Share on other sites
mk3_matt 21 Posted April 12, 2015 Author Report Share Posted April 12, 2015 Used a 3mm spacer plate it already had a gasket on it. Link to post Share on other sites
Sump_slammer 23 Posted April 12, 2015 Report Share Posted April 12, 2015 Cool thats the perfect size my mate with a r32 made the school boy error of using a 3mm plate then 2 headgaskets so never ran propper. Link to post Share on other sites
chrisvr6t 19 Posted April 12, 2015 Report Share Posted April 12, 2015 Will need a map to get it to run properly Link to post Share on other sites
Deckedvr 85 Posted April 13, 2015 Report Share Posted April 13, 2015 Mine was running like shit today as well... overfueling like crazy... running on 4 cylinders.... pressed the accelerator en bam.. engine died... my paintguy forgot to tighten a intercoolerhose... tightened the clamp and BAM... power back on ! But to burst your bubble... your car isnt going to run a little boost without being mapped mate Link to post Share on other sites
FishWick 21 Posted April 15, 2015 Report Share Posted April 15, 2015 If you still use the standard MAF and MAP with 440s, it will over-fuel like f'ck. Fit a 4" MAF housing and it will run better, but it will still need to be mapped. If you need to drive it somewhere to get mapped, refit the standard injectors and don't let the turbo go into boost. Keep the engine load light and the revs down and it shouldn't boost up. Link to post Share on other sites
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