Hks Ssqv Installation Question

[EVL-R33]

I just received and installed a HKS SSQV Bov into my RB25DET the simple way, but after the installation I noticed on the instructions which came with it says to disconnect the battery (-) cable.. I didnt do this, does anyone know why it needs to be done prior to installation? or is it OK to leave it connected whilst installing?

Also, im getting a real bad boost drop when changing gears, almost as if its leaking.. Has anyone else got this problem with the new SSQV?

Cheers.

Edited October 23, 2007 by EVL-R33

[raps86]

the reason they say 2 disconnect the battery is so that incase you touch sumthing u shouldnt and cause damage to the ecu or anything else

[EVL-R33]

the reason they say 2 disconnect the battery is so that incase you touch sumthing u shouldnt and cause damage to the ecu or anything else

ah ok.. thanks 4 the quick reply raps86

does anyone know why im getting a bad boost drop when changing gears? almost as if the car is gonna stall..

Edited October 23, 2007 by EVL-R33

[Col-GTSX]

Atmo valves can do this...

As the stock ecu is realying/expecting on return air post AFM...

By putting in a atmo valve your not returning the charged air back to the intake, hence the ecu is missing a huge chunck of "counted" air... So lack of air causes the engine to stall/labour for a second while the intake catchs back up to real time data being feed from the afm... Does this make sence?

The way to get round this is get a PFC or similar after market ecu which can be tuned with atmo valves and not have stalling issues...

[r33cruiser]

hey evl. i have had my hks ssq on my line for about 1yr. many people claim stalling issues. but it has NEVER happened to me. i think it is an urban myth that affects 10% of the population.

perhaps, the spring is too loose. i suggest tightening the screw on top of the bov. also from my experience, make sure the vacuum hose is on properly, same goes for the plumb back hose. ive forgotten this once and stalled 100m from my driveway

[Mikyel]

get the old sqv which is adjustable or the one after..latest one is shit..

i tried all 3 and i say first one is the best.. i only get pressure drop or stalling when i had the latest one..

[EVL-R33]

Atmo valves can do this...

As the stock ecu is realying/expecting on return air post AFM...

By putting in a atmo valve your not returning the charged air back to the intake, hence the ecu is missing a huge chunck of "counted" air... So lack of air causes the engine to stall/labour for a second while the intake catchs back up to real time data being feed from the afm... Does this make sence?

The way to get round this is get a PFC or similar after market ecu which can be tuned with atmo valves and not have stalling issues...

Makes sence what your saying, but I have a PFC installed with a Z32 AFM and its been tuned on an atmo GFB BOV previously.. I had no problems with the GFB, but I thought id give the SSQV a go..

I have the newest SSQV so there is NO pressure regulator on it and I cant tighten the valve spring..

When the valve opens to release the air into the atmo, it takes longer to close than the GFB i previously had, so when I accelarate again after changing gears the valve is still open for a second and the air doesnt get into the plenum causing a stall/labour..

On a positive note, the SSQV holds boost much better than the GFB i previously had..

Edited October 23, 2007 by EVL-R33

[Col-GTSX]

Yeah so the spring is not tight enough, and hence is not closing promptlly...

This will also cause the problem you describe...

[Sheng]

would the pfc and z32 pick up the BOV straight away after fitting or do i need to get it tuned