Lean Car Out?

[Spicy1390]

Hey, I have the hiboost fmic with the injen intake. I took off the bypass a while ago, and went with the Greddy Type s. It sounds awesome, and I am having no problems with stalling or anything. I have noticed that the car runs a bit richer now though. (I was expecting it to). Right now I have a cap where the receirc line went into my intake. I am thinking of putting a filter there instead to alloew more air. I think that it would suck in a little more air on the other side of the MAF thusfore the tricking the sensor. More air, but thinkins less would mean less gas right? Maybe lean it out a little. What do you guys think?

[Spooled]

That's an interesting idea. Do you have a wideband to meter it? If not, I'd be really careful about doing that.

[LinuxRacr]

You will have a vac/boost leak if you put that filter on there. Don't do it.

[Spooled]

Why would there be a boost or vac leak? That part of the intake is open to the atmosphere anyway. If he put a filter on the throttle body pipe, then there would be a problem, but he is talking about the return to the intake piping before the turbo.

[DSMConvert]

dont do it...A. that hole will allow way more air in than you'd need to do the slight bit of leaning you're talking about(thats a fairly large hole and a forced induction system will suck a ton of air through the path of least resistance that being the hole)...B. the computer is self learning meaning it will notice the difference and automatically correct and more than likely throw a code....nice idae just wrong application outlet...

[Spicy1390]

Its a pretty small hole, I think it is only like 1/2"- 3/4", and what other snesors do you think will make it throw a code? I am not arguing, just wondering what your thinking is. I still beleive that the easiest way for air to get in is through the big filter in my fender.

[DSMConvert]

It will throw a "system too lean" code...remember a vac. leak causes a car to run like crap, so a hole a half an inch will have severe effects on performance. An air system will always pull from the closest location when both holes are of equal resistance(in this case both holes are to atmosphere)....I mean you could try it and let us know, it surely wouldnt be the first time I've eaten my words...just be careful if you do....that amount of air could cause a very lean condition....our cars run in the ballpark of 10:1 to 12:1 so if you add 2 parts more air you're looking at a dangerous situation. hopefully that helps explain it a little better....if nothing else I'm positive it will throw a system too lean code or correct the problem in self learning mode....

[Spicy1390]

Just think of all the air that is thrown back in during recirc. That has to be more air then what a small filter on that hole could give. Like I said, not arguing, just hoping some one might have a way to test it out. It might be a cheap easy way to lean out our cars. Some one run with this...

[mp5jeff]

yes, but you will now be creating air ALL the time through the hole, not just when the BOV goes off...you can try it, it probably wont run right...as in idle, etc..

[DSMConvert]

hehe also remember that recirc air has already been counted, so it isnt new air just recycled air...the hole/filter lets new air in that hasnt been counted by the maf....thats the sorry thing about mazda they should of used a map and this all would of been a "moo point" as joey off of friends would put it....

[Rich24km]

i put a filter on mine. It helped alot. I have it capped off now and its rich as shit. I had the filter for the first few days i had it on and the car pulled great. but i only have a narrowband A/F and it dropped down like 1 bar from all the way rich instead of being pegged to the rich side. SO i dunno, i thought it ran better.

EDIT: BTW it idle'd alot better and I could set the BOV softer without even coming close to stalling. Now its set in the middle and i have it capped off.

[DSMConvert]

hehe well wow it seems rich has made me eat my words....i'm gonna try this myself to confirm the results...hehe i guess thats another case where real application actually proves theory wrong....

[Spicy1390]

Does anybody have a wideband gauge to prove this theory? I hate to do it and lean it out to a dangerous level. I think it will work, just being real catious before I try it. Keep in mind it use to dump sir into the pipe with recirc. Yes the air was already counted, and thats why well stall when we blow off, cause its not there. The filter will make it there again...

[LinuxRacr]

Anyone have a picture? I just can't draw it in my mind..

[wicked]

i put a filter on mine. It helped alot. I have it capped off now and its rich as shit. I had the filter for the first few days i had it on and the car pulled great. but i only have a narrowband A/F and it dropped down like 1 bar from all the way rich instead of being pegged to the rich side. SO i dunno, i thought it ran better.

EDIT: BTW it idle'd alot better and I could set the BOV softer without even coming close to stalling. Now its set in the middle and i have it capped off.



that's odd.(uhm)

[Spicy1390]

Nothing odd there that I see, more ir into the car on the other side of the MAF would make it leaner. The questionis, how much leaner....

[Spooled]

How about this:

Put another BOV on the recirc hole on the intake and install a filter in the horn. So essentially you will have one BOV letting air out of the pressurized piping, and one letting extra air into the intake after the MAF (not counted), but only when the first BOV is venting.

[Glowmunkey]

How about this:

Put another BOV on the recirc hole on the intake and install a filter in the horn. So essentially you will have one BOV letting air out of the pressurized piping, and one letting extra air into the intake after the MAF (not counted), but only when the first BOV is venting.
People on this forum are obsessed with dual BOVs... (boom07)

[Spooled]

People on this forum are obsessed with dual BOVs... (boom07)
Never heard of anyone doing this before. Dual setups that others have done are recirc and BOV I thought.

[Rich24km]

i don't know if a blow off valve on the intake pipe would work???

LINUX: I don't have a digital camera but think of the recirculation hole for the stock bpv and take the bpv off put a BOV on your upper intercooler pipe, and then put a breather filter on the hole where the BPV would normally recirculate.

[Spooled]

i don't know if a blow off valve on the intake pipe would work???

I'm not really sure, either. I was just assuming that if you connect it to the same vac source, it will open it to the atmosphere and let air rush in after the MAF. Of course, you'd have to have a flange on the intake pipe, too. Would probably be more of a pain than it's worth. Recirc would be the best bet.

[DSMConvert]

hehe yea this forum is the only one i've ever been on that does dual bovs for boost applications under 30psi....back to the hole idea....if you are going to try it i suggest putting some kind of ball valve on there and starting from closed and slowly open is a little at a time till the result are what you want...atleast this way its somewhat more controlled than just allowing an open flow of air in behind the maf...basically apply the same principle that you use when tuning a mbc...

[Spicy1390]

I like the ball idea, I guess I will have to spring and buy a wideband to see where it is at..

[jeffmsp]

suckin in unmetered air, what a great idea, while your at it why not take off the maf completely :rolleyes:

If you dont like runnig rich than just put the maf on the ic-to-tb pipe, then it doesnt matter how much air you blow off (as long as your blow off is before the maf)

[BlkZoomZoom]

Very stupid and dangerous idea. Trust me it won't work the way you think, there WILL be side effects that have not been mentioned and probably not thought of. Learn how a vehicles ecu works, and what sensors do what, and what the ecu looks for. You will find better and more efficent ways to do what your seeking.