BOV. MPG

[supergrass]

Since fitting forge bov,seem to be drinkigg fuel.Would having the wrong spring ie not yellow have any cause.DOV seems to work 100% but i did not check the spring,did order with yellow spring.

[Jenx]

The BOV has nothing whatsoever to do with fuel consumtion...except maybe you're driving the car harder to hear the noise at every gear change

[supergrass]

I think your spot on.On a run what would mpg would you expect? Thanks.

[Jenx]

Anything from 8mpg to 30mpg, dependant on how you drive.

[daddysumo]

I have seen this before on the turbo charged Fords and could never explain it but yes I have known it to affect fuel consumption.

Steve

[andygtt]

ok why are we fitting the dump valves on our cars.... is it purelly the sound? as it has no bearing on protecting the turbo as the blades are too small to stall and snap the shaft (reson they were originally designed and have to be fitted to large boost huge turbo applications).... do people really perseve a reduction lag during the gearchanging?

The reason I wonder is that having looked at the Nobles piping it seems the turbos have a lot of pipes to represurise after all the boost has been lost and to me this would take longer than and potential respool of the turbo due to it slowing down..... I removed mine on a 1.8bar cossie and it reduced the lag even though it was comonly 'known' that you had to have them fitted!

pretty amazed that it effects MPG though.... may be that the ecu isnt set up for the change in gearchange spooling... but still cant really see how it could have an impact if the cars being driven the same, strange.

[Jenx]

andygtt said:

ok why are we fitting the dump valves on our cars.... is it purelly the sound? as it has no bearing on protecting the turbo as the blades are too small to stall and snap the shaft

I think it helps look after the bearings though...

[gadgeroonie]

if a car is fitted with a Mass Air Flow meter or MAF then when you change gear the air continues to pass through it and out the dump valve - so the ecu thinks air is passing through the engine and adds fuel

the noble uses a MAP sensor not a MAF sensor - so this does not happen

[JLSELAN]

gadgeroonie said:

if a car is fitted with a Mass Air Flow meter or MAF then when you change gear the air continues to pass through it and out the dump valve - so the ecu thinks air is passing through the engine and adds fuel

the noble uses a MAP sensor not a MAF sensor - so this does not happen

FYI, the Rossion engine management scheme will use a MAF.
See pics here:
http://www.nobleforums.com/showthread.php?t=3859

Agree with others, though, that adding a BOV to a Noble cannot affect MPG.

[gadgeroonie]

JLSELAN said:

gadgeroonie said:

if a car is fitted with a Mass Air Flow meter or MAF then when you change gear the air continues to pass through it and out the dump valve - so the ecu thinks air is passing through the engine and adds fuel

the noble uses a MAP sensor not a MAF sensor - so this does not happen

FYI, the Rossion engine management scheme will use a MAF.
See pics here:
http://www.nobleforums.com/showthread.php?t=3859

Agree with others, though, that adding a BOV to a Noble cannot affect MPG.

thats intereating - not many aftermarket ecu's use MAF so it may have a ford ecu in there.

i like the idle control valve - our cars could do with one !

[JLSELAN]

gadgeroonie said:

JLSELAN said:

gadgeroonie said:

if a car is fitted with a Mass Air Flow meter or MAF then when you change gear the air continues to pass through it and out the dump valve - so the ecu thinks air is passing through the engine and adds fuel

the noble uses a MAP sensor not a MAF sensor - so this does not happen

FYI, the Rossion engine management scheme will use a MAF.
See pics here:
http://www.nobleforums.com/showthread.php?t=3859

Agree with others, though, that adding a BOV to a Noble cannot affect MPG.

thats intereating - not many aftermarket ecu's use MAF so it may have a ford ecu in there.

i like the idle control valve - our cars could do with one !

Using a Ford ECU is the plan, AFAIK.

[F.C.]

bov on mine made a definite difference on up change maxed out 5th to 6th otherwise the difference was negligable.
fuel consumption down to right foot to hiss ratio
F.C.