Open Atmosphere BOV

[gomer23]

Been awhile since I have been on here.

Anyway finally getting around to working on my 240 with a RB25 in it after many months of it sitting....again. I have a Power FC with Datalogit software, Z32 MAF, open aftermarket BOV which I believe is an older Blitz Type S I think. Anyway I had been working on some other tuning and also been trying to tune it to keep it from dying on decel. I know this is because the BOV is not recirculated. When I set all this up I figured since I had a Power FC I could tune around it...or make it better. But thus far I haven't had alot of luck in doing so. I keep seeing that some people were able to "fix" this with a setting on the Power FC but not sure exactly what should be changed.

Anyway if anyone has a suggestion on what to change on the Power FC, or what target area of cells I should be changing that would help a bit. I may end up just recirculating it and being done with this but would be good to know how to compensate on the Power FC.

Thanks.

[Darius]

Hey! Glad to see you still have your car. Honestly, I would just recirculate it to the intake pipe. Mine would fall flat on its face without it and I had a PFC too. I tried changing some of the settings to compensate, but it never worked out.

[gomer23]

Long time no see Darius!

After this weekend I am finding that out too. I pulled fuel waaaay back in a few spots and saw very little change if any.

I am trying to figure out the best way to recirculate the BOV unfortunately Blitz doesn't make a flange anymore so I have to rig that up and I'll have to redo my intake.

And yes I do still have the car, been working on it and driving it alot more lately. Still going to try to sell it here soon but still have it. Until recently I hadn't driving it in a few months haha.

[Darius]

It doesn't look like it would be too hard to fab up a flange for that BOV and just weld a short piece of pipe to it. Fun, right?!

On my PFC tunes, the off throttle cells are way trimmed back so there isn't any sputtering or popping on decel. I can send you some of my tunes so you can compare.

[gomer23]

I actually found some stuff on a DSM forum for recirculating that BOV. I could just hack off the end of horn and putting a hose over it. I wish Blitz still make the actual flange for it.

But ya some maps would be sweet! I have been editting cells between N1-4, P9-11. Where the map tracer seems to go when I let off the gas but doesn't seem to do much.

I actually found some old thread (http://zilvia.net/f/tech-talk/281703-la ... ction.html) a couple days ago about the latency correction. I changed that .2ms and made a big difference on idle and just little smoother AFRs under normal driving acceleration....wish I could of known that awhile ago haha. Did you change the lag vs battery stuff too? I have the Deatschwerks 740cc injectors.

[Darius]

Yep I changed the lag vs battery voltage settings to correct for the injector lags. PM me and I'll e-mail you some tunes.

[jbracy7]

Open atmo bov are lame,there is no real gains from this,other than the noise,and rice lvl. There are a few peaple that belive it lowers lag,it is not true. Any gain from it fails when you have to tune around the problems caused by a open bov.

[gomer23]

I understand that, I left it open because of the BOV that I bought at the time when I switched to the Greddy Intake manifold and I was hooking up a Power FC at the same time and figured I could tune around it. I could care less about the sound, it was simply no easy way to recirculate and I was on the assumption that I could correct it the power FC but no luck so I will be working on recirculating it when I get around to it.

[jbracy7]

As soon as you do, i belive you will enjoy the car a ton more,track days will be more fun,and then even riceboys will say to you,"my blank has a open bov and that thing sounds insert douchbag commit" just say man only p****** have open blow off valves:-P

[Darius]

I run an atmospheric BOV (Greddy ype-R), but I also have a MAP-based tuning system which doesn't require a recirc line to run properly. It has nothing to do with rice unless someone claims that it has a performance advantage. It is a glorified pressure relief valve, but I admit that some sound better than others.

[240z4u]

I'd VTA in a minute if I could just to save plumbing hassles. PFC doesn't like it much, and as mentioned above it's not really tune-out-able.

and Jbracy7 amuses me.