Greddy Type R Bov

[Spurdo]

hey guys now as title suggests i'd like to know if my blow off valve is push or pull type as i cant seem to find much info on them. im assuming its push type can someone confirm this?

recently when i installed a front mount intercooler the bov sounded different. it used to flutter when i changed gear after only making half boost or so. and if i made full boost it would sound normal, no fluttering (full boost is 10psi).

once the front mount cooler was on it would flutter slowly even after hitting full boost, i assume this is because the added capacity of my intercooler/piping system has increased and there is more compressed air to expel and the spring is set too soft maybe? the lag also got worse. i used to see 10psi at 2900rpm but after install it was more like 3500rpm and the low end torque had turned to complete rubbish.

eventually a light clicked on in my head and i thought i'd wind up the spring in the bov to set it harder. this reduced the lag somewhat and improved the low end torque a bit, still not as good as i'd like. 10psi is now at about ~3200 and the bov sounds normal again after full boost, but no longer flutters on low boost gear changes like it used to.. was the fluttering before at all normal?

also i've been told by a guy at nissan to move my bov to after the intercooler. at the moment it sits halfway between the turbo and the intercooler but apparently thats not the way to do it. it was like that when i bought the car and i never looked much into it.

im looking to pick some brains here so any help is appreciated

Edited June 22, 2010 by jonboy

[89CAL]

I have my blow off valve before intercooler plumbed back into my intake pipe (Might be able to see in my sig?) and my car runs no different to before it was like this

Maybe theres a vac line or somethng loose? because really nothing should have changed except for maybe some slight amount of lag (an additional 500rpm at the most) depending on your IC setup and piping

[lotsalag]

Did u touch the blow off valve at all? change where the vac/boost line came from?

Sounds like u have a boost leak somewhere, if the bov was ok before the cooler install it wont be that.

check over every join etc carefully, hopefully not a big headache especially if it was a new kit, u can assume hoses and cooler core have no holes.

The cooler itself will have no impact on lag as u mention, dont point ur finger at that either

Hope that helps somewhat