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Vl Commodore Ignition Coil Into Rb20Det

Vimlesh

By Vimlesh,
in Engines & Forced Induction

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Vimlesh Explorer

Vimlesh

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I think you're confused about what different terms mean.

Lag (when most people around here use the term) is "waiting for boost". That may be "waiting for boost" when you are at lower revs than the turbo will spool up to - ie, the engine must accelerate naturally aspirated until there is enough exhaust flow to spool the turbo up. Or it might be "waiting for boost" when you have been off throttle, say going through a corner, but the revs are high enough to make boost - when you put the foot back down the delay before it starts making boost is lag. That latter one is the real and only true definition of lag, as originally applied to truly laggy turbo cars like the first Porsche turbos. Lag was a killer back then - you'd come out of a corner, put your foot down and wait and wait and wait and they the car would explode onto boost, swap ends and try to kill you in the scenery.

Anyway, the car not making boost until 3000rpm or so is normal, and as long as it doesn't fart and carry on before it comes onto boost, then everything is fine.

A BOV SHOULD NOT VENT TO ATMOSPHERE if you have an Air Flow Meter (AFM). The car will not like it. The AFM measures the air flow while you're on boost. Then you let the throttle off and the BOV let's a lot of that air out. The ECU doesn't know the air is gone and continues to put the fuel into the engine. This causes, at the least, shitty fuel rich running, and can and will cause the engine to stall - to actually stop running. This is a shitful situation and can be avoided by simply not running a venting BOV.

The BOV is not involved in "lag" at all, so forget about it

ok thanks. I will try to get a recirculation pipe going back to the turbo inlet. and see the difference.

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