Thread: BOV placement DET RWD

I just bought a S13 Silvia with a sr20DE+T running on low boost without a BOV. I intend to install my Blitz DD BOV and recirc it. In PICs below please refer to the green circles. The one on the hot side pipe is where I am thinking of placing the BOV. The one over the yellow cap is where I think I am supposed to recirc to. And the last one it a capped off vac line I am planning to plump to.
Am I on the right track? New to RWD DET and I trust this forum more than any other hence my asking here. Thanks

Your placement is fine. I wouldnt recirculate the bov though. Its not necessary on the rwd cars, they run just fine without it recirc'd.

You could also put it on the cold side pipe and have a shorter vac line to it from the manifold. Either or works just fine.

where on the cold side would you recommend? Closer to the throttle body or the intercooler. I have seen a number of pics with gys running them down my the intercooler.

you want it after where the IACV hose attaches, as far away as you can get it.

Ashton I love reading about how big you are going and some of your stories are great but, please explain how the orientation of the engine, the drive wheels, or the ignition system would determine if venting to atmosphere is a good idea.

Non of those differences in fwd to rwd change the fact that the re-circulating valve helps to reduce compressor surge (which atmosphere venting will too) and prevents the engine from running pig rich at every throttle lift since you are dumping metered air. This problem only gets worse as lbs of boost are added as well.

Sent from my HUMBLE 4.5 using Tapatalk

Its a setting in the ecu man, the rwd det ecus are programmed for boost and have a decel setting in them to compensate. Cuz even with recircing the air back it still take a while for that metered air to return back near the IACV hose.

Ive done many many rwd swaps and fwd de+t's and so on and its noticably different on the rwd's venting atmosphere compared to on a fwd ecu. Again its a setting in the ecu itself that helps. It will still go slightly right when lifting the throttle especially if you just got on it and went from full throttle full boost to lifting and pushing the clutch in, it will go rich but the rwd ecus recover idle pretty quick and havent seen one that had an issue with stalling from open vent.

FWD's they will stall all the time for whatever reason, which is the reason i do all my setups in blowthrough configuration to eliminate that and can run open vent all the time no issues

can anyone confirm that the bung with the yellow cap is for a recirc hose?

Keep in mind I have a DE+T form a silvia Q

You are right. They are programmed for boost, and for a re-circulation valve.

I get that it may work better on rwd vs. Fwd but if the desire and willingness to do something right is there why encourage shortcuts?

I know you aren't taking an unnecessary ones in your build.

Sent from my HUMBLE 4.5 using Tapatalk

No that is not the bung for recirculating. You have to plumb somewhere after the maf as the air you are putting back in has already been metered and fueled for.

Sent from my HUMBLE 4.5 using Tapatalk

The bottom of the black rubber tube that is attached to the maf should have a second, smaller, tube attached. Assuming of course that that is the factory piece, which it looks like.

Sent from my HUMBLE 4.5 using Tapatalk