bov recirculation

[tattooedgst]

hey guys i have done alot of reading and learned that the bov NEEDS to be recirculated. my issue is i havent had my car that long and the bov has been vented to the atmosphere the whole time i have had it,when i put the hose on and recirculated it back into the intake it stumbles and sputters at about 3k to 4500 rpm. if i pull the hose off and vent it to the atmosphere the car runs fine

 

[agentorange313]

venting to atomsphere with a MAS system will make your car run rich. Maybe your spark plugs has been fouled out and can not ignite the leaned out mixture.

I would pull them out and check the condition of them.

 

[tattooedgst]

venting to atomsphere with a MAS system will make your car run rich. Maybe your spark plugs has been fouled out and can not ignite the leaned out mixture.

I would pull them out and check the condition of them.

i do beleave this will be the first thing i do soon as i get home. that does make sense being it only does it at the higher rpm and around 10psi of boost. i will post up my findings this evening. in the mean time i still want to hear everyones opinions and thoughts on this

 

[dsm144]

Maybe the person you got it from already fixed the computer problem so that it runs correctly when vented to the atmosphere

 

[Joe-GSX]

hey guys i have done alot of reading and learned that the bov NEEDS to be recirculated. my issue is i havent had my car that long and the bov has been vented to the atmosphere the whole time i have had it,when i put the hose on and recirculated it back into the intake it stumbles and sputters at about 3k to 4500 rpm. if i pull the hose off and vent it to the atmosphere the car runs fine

Where is the air sensor located.. before or after the bov? Can you post a pic up of the engine bay? If the sensor was moved, he could have vented to the atmosphere properly.

 

[agentorange313]

Maybe the person you got it from already fixed the computer problem so that it runs correctly when vented to the atmosphere

I thought this also at first, but if you look at his profile all he has to tune with is a SAFC. You can not compensate for venting to atmosphere with tht tool. It relies on the MAS, and as long as you have the sensor before the turbo inlet, then you can not vent to atmosphere.

 

[dsm144]

I thought this also at first, but if you look at his profile all he has to tune with is a SAFC. You can not compensate for venting to atmosphere with tht tool. It relies on the MAS, and as long as you have the sensor before the turbo inlet, then you can not vent to atmosphere.

So all you need to do is move the sensor to be able to vent to atmosphere? Im not planning on venting mine but Ive heard a lot of different things about the problems and how to fix it.

 

[agentorange313]

So all you need to do is move the sensor to be able to vent to atmosphere? Im not planning on venting mine but Ive heard a lot of different things about the problems and how to fix it.

well technically I guess you can, I have never see a mitsubishi MAS sensor after the turbo. Even if it was after the turbo and set up like a GM MAF, you would have a super hard time creating a seal around the are for the air filter, it wouldn't hold any positive pressure, even with that gasket ring (plus it would have to be a 2g or evo). I remember reading a thread on here about this exact question.

http://www.dsmtuners.com/forums/tuning-engine-management/229763-2g-mas-blow-thru-setup.html

bottom line, the way you vent to atmosphere is to use a GM MAF blow-thru set up with link or a translator, or switch to speed density (MAP and inlet temp).

 

[jcarmichael]

I am running mine open just put a fmic in last week with a different bov and deceided i didnt wanna recirculate car runs fine without it been running open for about 3 weeks now maybe 4. haven't had any issues I read on some forums you might have some issues like it missing out at high boost but mine doesnt do that or it might try and die on you when you are at idle but mine runs good that way as well.

 

[siccmade]

I'm pretty sure there is a thread on this already. I actually think I've read it a few times as a probationary member. Also, I don't believe there is a way to just "fix" the computer to allow venting to the atmosphere without supporting mods like a gm maf, map, etc.

 

[LiquidX]

venting to atomsphere with a MAS system will make your car run rich. Maybe your spark plugs has been fouled out and can not ignite the leaned out mixture.

I would pull them out and check the condition of them.

This is a good place to start. Have you checked your plugs yet?

Maybe the person you got it from already fixed the computer problem so that it runs correctly when vented to the atmosphere

Being able to vent properly is one thing, however, you should still be able to hook the tube back up to the intake and run just the same if not better.

So all you need to do is move the sensor to be able to vent to atmosphere?

No. You need to either have a GM MAF in blow through which was already mentioned, or have the ability to run speed density. The stock MAF is not built properly to withstand positive air pressure, only vacuum. It would also be a HUGE restriction due to it's honeycomb design compared to the "3 resistors in the air" setup that the GM MAF has.

Why not just leave it atmospheric? Majority of tuners out there runs their BOV open, it doesn't hurt anything.

It hurts your gas mileage and fouls up plugs quicker due to that time period of being rich when the throttle plate closes. If your BOV leaks at all, then it'll be even worse as it become a boost leak at positive pressure and a vacuum leak in well, vacuum.

I am running mine open just put a fmic in last week with a different bov and deceided i didnt wanna recirculate car runs fine without it been running open for about 3 weeks now maybe 4. haven't had any issues I read on some forums you might have some issues like it missing out at high boost but mine doesnt do that or it might try and die on you when you are at idle but mine runs good that way as well.

It should run 100% regardless when driving as the BOV remains (well it's supposed to be) closed. The only time issues will occur is when the throttle plate closes after positive air pressure or the BOV is damaged (leaking).

 

[brevlle]

i vent to the atmosphere, but tuned with ECMLINK, on speed density.

 

[ed1380]

I thought this also at first, but if you look at his profile all he has to tune with is a SAFC. You can not compensate for venting to atmosphere with tht tool. It relies on the MAS, and as long as you have the sensor before the turbo inlet, then you can not vent to atmosphere.

dont know what safc he has, but the neo can compensate for venting to atmosphere

 

[LiquidX]

dont know what safc he has, but the neo can compensate for venting to atmosphere

So it's going to account for a specified amount of metered air that is lost after positive pressure and adjust the fuel accordingly during that split second? I doubt it works that well.

The only reason the GM MAF is capable is because it doesn't meter air until after the BOV.

 

[ed1380]

I've never done it, and dont know how effective it is, but I know it's an feature of the neo.
and since he's having problems when he recirculates, he might have that feature enabled and that's ruining his afr

 

[TWOpointFORliter]

I sold my neo because it was junk. However before I did I got very familiar with it. I can tell you from first hand experience that there is NO feature whatsoever to compensate for VTA.

 

[ed1380]

I sold my neo because it was junk. However before I did I got very familiar with it. I can tell you from first hand experience that there is NO feature whatsoever to compensate for VTA.

I had a neo I would know.


from their website

On MAF applications with open-air blowoff valves, there is a deceleration air correction feature that allows the tuner to compensate for the over-rich condition that occurs at throttle-off. By adjusting the MAF signal at throttle-off condition, the tuner can reduce the amount of fuel injected and prevent stalling.

 

[TWOpointFORliter]

Well it must be a hidden feature cause I never saw it in any of the options menus I accessed and like mentioned I doubt it works. Bottem line: if you want to vent do it right.

 

[HULK]

Yelp, sounds like the car was tuned to run with the vented bov.

 

[dsmer44]

If I'm not mistaken there is a setting on safc for decel. Said it Helps tune With vented bovs, bigger turbos ect..

 

[tattooedgst]

hey guys soory it took me awhile to get back with results, im runnung just the basic safc its NOT a neo or safc2 i put the tube back on after i changed the plugs and no difference i went with ngk bkr7e plugs. i adjusted the throttle air screw on the throttlebody and it doesnt sputter anymore i got this car on a trade and really cant verify anything the guy told me that was done to the car. i changed the valve cover gasket today and did find arp head studs. since its not breaking up anymore im just gonna leave the hose on and to get the car tuned the right way and get rid of the safc .

 

[LiquidX]

You should be using NGK BPR6ES gaped at 0.028".

 

[agentorange313]

http://www.dsmtuners.com/forums/frequently-answered-dsm-questions/239375-maintenance-schedule.html