Foxx Posted September 26, 2023 Share Posted September 26, 2023 Hi all, Car is a 2000 VVTI TT6, FCD, Decat w/ 1bar restrictor, Fuel Pump, boost controller. Rest stock. Problem is that when lifting off, usually if quite abruptly, makes a big pop and sometimes black smoke out the exhaust. Didnt notice this pre decat, is it normal? Many thanks. Link to comment Share on other sites More sharing options...
rider Posted September 27, 2023 Share Posted September 27, 2023 You should be able to tell if its smoke or soot coming out. If it only happens when you go big pop then you have an explosion in the exhaust because of over fuelling that would dislodge soot. I'd be more concerned about over fuelling or timing issues. Link to comment Share on other sites More sharing options...
TheTurtleshead Posted October 15, 2023 Share Posted October 15, 2023 Do you have an aftermarket vent to atmosphere blow off valve? Link to comment Share on other sites More sharing options...
wile e coyote Posted October 15, 2023 Share Posted October 15, 2023 the vvti shouldn't vent to atmosphere I had a hks blowoff valve specific for the vvti I think I still have it in a box somewhere Link to comment Share on other sites More sharing options...
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