rpm drops to 100 after rev.

[colombianbryan]

i just swapped in my s14 sr20 and ive been having a couple small problems. when i turn it on it idles fine but when i rev it to about 4k rpm it drops to 100 and almost stall out. when i drive it and go into boost i let off around 5k rpm and it will also suddenly drop to about 100 rpm... i have a hks bov welded onto the coldpipe and flutters alot when rev'd and sounds like its coming from the intake so im guessing its compressor surge.. i dont know what to do ive searched alot and nothing.... its running a fmic, t28 turbo, megan turbo elbow and circuit sport downpipe. please help!!!

[Nicelyphe]

BOV Recirc? My set up is an s13 blacktop, with hks ssqv on the hot pipe. Not recirculated, but when i plug up that recirculation tube i get the bad rpm drop like you, but when i leave that recirculation tube unplugged it runes fine. Is your tube plugged or unplugged?

[MisawaJason]

BOV Recirc?
Same thing that happened to me on one of the cars that I owned in Japan. Went from a recirculated BOV to one that was vented to the atmosphere and it started doing the same thing that you're describing. I just learned to catch it with a little throttle before it would stall

[colombianbryan]

my hks bov has no recirculation right now so its unpluged and still happening...

[Nicelyphe]

Hmm..Try it plugged i suppose. I don't have any experience with bovs on cold pipes.

[ZilviaKid]

i had similar problems when i got rid of the recirc on my sr, just hook it back it up.

[nissanfreak317]

I've never had any recirc on my s14 sr, 100 rpms sounds super low. Mine might drop to like 500-600 at the worst.

[Nicelyphe]

Yea, does sound low, weird enough when i plug my recirc tube with something it surges like that. So i just leave it open and it works fine.

[colombianbryan]

yea it drops to 100 rpm like it was nothing. ive never recirculated my bov so i think i should try and see what happens