DV Question

[SteveS]

 

[neg]

It has something to do with putting air back to the turbo to keep it spinning so when you back on boost it can react quicker, dumping air out means the turbo will have to spin up again wasting time/power - something like that anyway...

Plainly the 1.8T and 2.0T have been designed to re-circ the air unlike other TC'd cars so its best to keep it that way.

I understand, however DOES it ACTUALLY keep the turbo spinning, if its just put back into the intake, then its not exactly pushed into the turbo to keep it spinning....  i know thats the idea, but is it fact!

I would hope so!

Means the turbo is not having to work so hard so effectively using less energy, less fuel, less turbo lag.

Get a atmos valve and see ... 

[SteveS]

hum, i even spoke to awesome, and they said "If it makes any difference at all, It would be that margainal that you would need a Science lab to figure out the exact differences"

lol

[neg]

maybe it works better under cirtain circumstances - like when the is more boost or when WOT through the gears etc.

[topher]

they said "If it makes any difference at all, It would be that margainal that you would need a Science lab to figure out the exact differences"

Or an ECU, which can, and does tell the difference, and then throws a wobbler about it.

[RedRobin]

they said "If it makes any difference at all, It would be that margainal that you would need a Science lab to figure out the exact differences"

Or an ECU, which can, and does tell the difference, and then throws a wobbler about it.

....Exactly! Awesome sometimes say some things which surprise me!

[SteveS]

they seem to think the ecu doesnt throw any errors up

[chungster]

a DV doesn't put air back into the turbo on intake side to keep it spinning; a DV relieves the pressure between the turbo and intake manifold when the throttle.

without a DV, the compressed air will go back towards the turbo putting huge strain against the compressor fins and the turbine shaft aswell, as the air is going AGAINST the direction of rotation/air flow in the turbo.  This will ultimately kill a turbo, or reduce its life severely.

a Vent to Atmosphere DV may not necessarily throw up any codes, but i would pretty much guarantee a worse MPG than with a recirc DV.  This is because the ECU will expect the released air to still be "in the system" post MAF, but with VTA DV this is removed from the system. So the Air/Fuel mix will be slightly differently (more fuel, less air) = richer running, and potentially less MPG / Fuel efficient.


that's my view anyway...I'll let TT correct any errors!