bov, difference to throttle feel

[Jimbo2000]

heya.

chucked on a stealthfx bov last night cause i simply wanted a change.

my concern is when its fully plumback it drives totally normally but when switched to atmo i get a slight hesitation/sticky feeling when upshifting, it just feels a little bit different.

and no theres no stalling issues at idle or coming to idle, or excessive richness.

[Jimbo2000]

mmmmm

[Tommyk]

hey Jimbo

why not just keep it plumback ?

[NZM.031]

that will happen....its normal

when you vent to atmosphere, all that registered air is lost....the ECU reads it and dumps fuel in, but then gets no air, and also, when all that pressurised air is lost, it takes a few micro seconds to build up again, as it loses its momentum. its not there on hand to get forced in on throttle as its been dumped out.

cheers

Linton

[bigcarl]

also depends on whether you are running a map senser or air flow metered ecu? with an air flow metered ecu ;e.g. apexi fc you need to run plumb back for the reasons above. if you run a map sensored ecu; e.g. link . you can run both types of blow off valve.

[GTR-Ben]

I think you can buy something to correct that problem that wires into the AFm and I believe PowerFc's have this built in so running Atmo BOV's will not effect them.

[Ronin 09]

that will happen....its normal

when you vent to atmosphere, all that registered air is lost....the ECU reads it and dumps fuel in

...

No, the ECU does not 'read' the lost air - the ECU actually does not register the lost air volume, and continues to inject the amount of fuel from the A/F mapping that correlates to the volume of initial air that was read by the hot wire at the AFM. As a result the mixtures run rich.

[Jimbo2000]

right, so its not just me Cheerio's

what if i run it half and half? that seems quite a bit better but not perfect, is that alright?

[someonestolecc]

In theory the half/half atmos/plum is why it was made so that AFM cars wouldn't suffer so badly.

Try running it 90/10 plum/atmos and see if it still makes the noise you like

[Jimbo2000]

sweet will do