brett_32i

im lead to believe that the xr6t runs a maf sensor and not a map. does this mean a vent-to-atmosphere bov cant be fitted?

brett

SPALDING GREEN

XR6T uses map.

brett_32i

so then, has anyone fitted an after market vent-to-atmosphere bov?
would it void warranty?

whats the ID of the rubber hose running from cooler to manifold?

brett

HOTDBZ

JCV8 from ************ forums has installed a GFB Stealth FX Vent to Air BOV. I'm having a similar one installed in my turbocharged AU XR6 pretty soon, but will incorporate plumb back...not a huge fan of the "sneeze"

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theBEAST
Un-Naturally Aspirated AU XR6
Track Progress of Mods: Click Me! (Updated Regularly)

Zoomer

Ahh, apart from the rice factor of installing a BOV that vents to atmosphere.

You will throw out the A/F ratio during gear changes.

Attached Images

map.jpg (33.9 KB, 155 views)

laminge

Zoomer

To a layman, wht does this mean?

Zoomer

I started to write a simply reply, but the more I think about it the more some d!ckhead is going to jump up and down about the technical workings on the ECC, or charged air hitting butterfly on the plenum.

So, it’s easier to say when you vent the metered air to atmosphere, the value of Air entering the combustion chamber is less then what’s expected. So fuel is metered and expecting, lets say X amount of air. But it actually has X-n amount of air; n being the amount of air vented to atmosphere.

The picture is the wiring of the ‘powertrain control module’ of the Barra240T, which should help you reference what im on about.

Zoomer

You already have enough happening during gear changes, ie torque limiting on gear changes and so on. Why run it rich for a few seconds is a ricer BOV???

Although not wastegate control, that’s coming SOON!

Jimbo

If you vent the BOV to atmosphere in an XR6T you won't affect the A/F on gear changes. The MAP sensor is mounted in the manifold after the throttle body. The PCM uses the reading from this to calculate how much air is going into the engine, once it knows how much air is going into the engine it knows how much fuel to inject. If the BOV doesn't affect the manifold pressure then it won't influence the air fuel ratio. Whether the outlet from the BOV is plumbed back or vented to atmosphere the MAP sensor can't see it so it doesn't care. MAP sensed cars are therefore quite immune to air leaks in the intake ducting.

However, if your cars has a MAF (mass air flow) sensor, this actually measures the amount of air going into the engine. It is normally mounted before the turbo, so if any of the air going through the MAF doesn't make it to the engine (because it is being vented by the BOV for instance) the PCM doesn't know this and still injects the full amount of fuel, causing the richness. MAF sensor car don't like air leaks at all, but make things like EGR calibration easy, but that's another story...

Jimbo

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MustangNicko

whatsa MAP

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