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Not Another Silly Atmo Bov Question

nuclear_skyline

By nuclear_skyline,
in Engines & Forced Induction

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nuclear_skyline Mentor

nuclear_skyline

Posted
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Posted

NO BANANAS FOR YOU! i turned off the ebc so I was only running 8 pound.... unless its on R&R all the time, NO FIX! the car feels sluggish and not fun.... I wouldnt be hitting R&R at 8 pound would I? One reason I think I'm not is that I am sucking through the standard airbox without the snorkel... I.e. its drawing hot as air from the engine....

TTT Grand Master

TTT

Posted
Posted

Explain this again.

you are in lets say 2nd gear.

foot to the floor, you accelerate to 6000rpm?

then step on clutch to change gears.

you hear some flutter and the car jerks a little (while you are off the gas).

or does the jerking happen once you've got in to next gear and plant it again?

nuclear_skyline Mentor

nuclear_skyline

Posted
  • Author
Posted

Hmmm.... good questions ask you....

I drive the car pretty easy most of the time. So when changing normally around town (3000rpm) I dont shift extremely quickly and you can feel the car jerk around a little bit, feels as though the pressure is bouncing around a fair bit....

When at high rpm, and quickly changing between gears, it doesnt seem to jerk as much.... Less time for the air to bounce around???

I read through the R&R stuff on other threads and I'm sure the car is suffering from it, however this seems different.

TTT Grand Master

TTT

Posted
Posted

but explain the moment of the jerking (eewww)

is it, when foot is on clutch, or when in gear and accelerating AFTER changing gears?

may be a stupid question but have you taken the stock bov off and checked to make sure it's not blocked off with a plate?

or that the plumback line doesn't have a cork of some kind in there?

this is the way I see it.

1.) car jerks when accelerating after chaning gears.. as in you are back on the boost = R&R

2.) car jerks when you are off the accelerator AFTER boosting = blocked bov.

you have said that you get flutter so I am leaning towards the fact that either the bov is blocked or that the tiny bleed hole under the bov base is blocked.

either way.

a few clamps and 2 bolts and the bov comes off.

remove it and check what I mentioned.

r32woohoo Rising Star

r32woohoo

Posted
Posted

I'm getting this same problem, it jerks when i get back onto the gas after a gear change ie: if i rev it up and dump it into the next gear i get a nice fart and jerk before i go anywhere.

Got a highflow with chipped ecu and z32 afm

getting a gtr bov this arvo so maybe it might fix it

r32woohoo Rising Star

r32woohoo

Posted
Posted

Not sure if it's always done it

I never used to drive it that hard so i've only started to notice it recently

Nothings changed since anyway

I haven't got a working scanner atm but my afr's are pretty flat along the 11's since its tuned for 20psi and im only running 15ish

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