Venting the Stock BPV on an ST205 GT4, Bad or is it ok? Options

[Goonter]

Ive been reading all night about blow off valves and bypass valves. All i seem to read about is bad things (besides the sounds it makes) about blow off valves. Things like you run rich, lose power and crap like that. I wanted to know if this is the same way for 3SGTE ( i would assume so) Also does running rich every time you shift gear waste a noticeable amount of gas?

Also say i don't get a BOV. The BPV is designed to recirc the air back to the intake box. If i get an Apex'i intake filter to replace my box, Is there any way i can recirc the air back to the intake system? (btw I'm just getting the filter. The rubber intake piping will stay. I noticed the BPV is bolted onto the box so i see no way of getting it recirc'd to the intake system unless the piping was metal and a flange was welded onto it for the BPV to bolt onto.

This post has been edited by Goonter: Sep 24, 2011 - 6:08 PM

[Unicorn]

No problem at all, just glad I can help a little

By the way, in modern mechanics, MAP sensor theory often only covers it's use as an ignition timing sensor input for the ECU, but in this case it is used to read air mass data using the "Speed Density Method". This takes engine RPM and air temperature into account in calculating the approximate amount of air being ingested by the engine. This information is used by the ECU to calculate how much fuel should be injected, and also through the traditional use of the MAP sensor, it can be used to adjust ignition timing.

This is a very "heavy reading" article, but it's got all the info you could ever need on speed density method: http://support.moates.net/2010/02/11/theory-speed-density/

For the purpose of this thread though, the important piece of information from there is this:

The goal of Speed-Density is to accurately predict the amount of air ingested by an engine during the induction stroke. This information is then used to calculate how much fuel needs to be provided and may also be used for determining an appropriate amount of ignition advance.

This post has been edited by Unicorn: Sep 19, 2011 - 6:52 PM