Toymods Car Club Inc: Tech & Conversions => recommended BOV for 3SGTE (pretty stock)

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RWDboy
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Location:
South Australia
Registered:
July 2002

Re: recommended BOV for 3SGTE (pretty stock)	Thu, 15 July 2004 00:32

It's actually not that common, usually there isn't enough (or any) oxygen left to ignite the fuel straight away in the turbo, however it will vapourise VERY quickly and as soon as it gets towards the exit of the exhaust it will probably ignite/combust if/when it gets access to oxygen if the temperature of the exhaust is high enough. Sorry - my bad! That cloud of black smoke you see is actually carbon, not unburnt petrol - carbon is a result of the engine running rich and achieving imperfect (yet complete) combustion. Unburnt petrol (vapour) will result from imcomplete combustion, and will occur with either rich or lean mixtures. If you are getting incomplete combustion in a turbo engine then you may notice pops and bangs. Such 'dramatic' levels of incomplete combustion are fairly rare (from my understanding) and only occurs in very poorly tuned engines. A BOV usually operates when you lift off the throttle - meaning that your engine will usually retard the timing (there are other factors regarding modern ECUs timing I know). The pressure level in the intake manifold will drop - but the MAP or AFM will tell the ECU that there is still tonnes (in the case of a MAP, many metres cubed in the case of AFM) of air flowing through the intake manifold. The ECU delivers 'x' amount of fuel given the amount of air it thinks is going through the engine. Due to the (likely) change in timing and the excess fuel (rich mixture) chances are incomplete and imperfect combustion will occur resulting in oxygen and fuel heading off merrily towards the turbo. Chances are also that this mixture heading towards the turbo is also 'rich' (lower than 16:1 air/fuel ratio) meaning there will likely be a puff of black smoke as well out the back of the exhaust. To all those who know more about this kind of stuff than me, feel free to 'fine tune' my statement (ie - I've got my flamesuit on, so fire away guys) [Report message to a moderator]

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