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Old 06-03-2002, 04:07 PM   #1
rhdude
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Join Date: May 2001
Chapter/Region: MAIC
Location: Manassas
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2009 Acura MDX Sport

Default Can you move the MAF after the BOV???

Hey,

this question is mainly for steve and scott, but you all can help too...

With the comments from everyone saying you can't vent the BOV to atomosphere cause it will mess the MAF readings up... In SCC on their Matrix they got around that problem by making a braket for the MAF sensor in the intercooler pipe. Could you do that on our car? Then you could vent to atmosphere and still run safely... or is there anywhere after the BOV you could mount it?
I know the intercooler sits right on the throttle body, so it might be a tight fit....


--Brian
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Old 06-03-2002, 04:10 PM   #2
Impreza Rider
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I don't know if it will work or not...but it seems to me that the readings would still be messed up because the MAF will read air still going passed it, even if it's going the other way (ie, to the BOV)
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Old 06-03-2002, 04:21 PM   #3
rhdude
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like this....

it apperantly worked for them...
Attached Images
File Type: jpg scc article.jpg (44.5 KB, 83 views)
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Old 06-03-2002, 04:42 PM   #4
elgorey
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06 nasa spec miata champ

Default

is it really worth all the trouble? It would be a pain to drill into your IC pipe, and it would create a potential vacuum leak spot.

The IC pipe would also have to be the same diameter as the intake tube in order for it to read correctly. (the same reason why some CAI cause a CEL and idle problems)

and all just for that *PISSHH* sound?

doesnt the SAFC compensate for atmospheric venting bovs anyway?
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Old 06-03-2002, 05:13 PM   #5
Bob O
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BRP

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Is it a question of messing up the readings or messing up the MAF? As far as the readings go, when it vents, the car will run a touch rich (the MAF thinks there is more air than there is, cause that air was vented to atm). As for the subaru MAF that's another thing entirely, some have had problems, other's not. Plus like elgorey said, you have to have a properly sized intercooler pipe; it must be very close to the MAF housing it used to mount in unless you have a air flow chamber to recalibrate the new housing size and it's effect on how it cools the hot wire sensor, and therefore, it's ability to accurately measure how much air is going through it. I suppose you might be able to tune it to compensate for the change (ie tweak until the EGT and air/fuel ratios are right, and simply not care that the MAF is "thinking" differently), but I doubt the AFC has this much authority range. Remeber they were doing all this with a TECII programable ECU. Wee bit more capable than a simple AFC. You'll have to make the "phoosh" sound with your mouth like the rest of NA guys

Speaking of electronic gagetry, are you getting an ITC (apexi or otherwise) to play with timing as well as a J&S (or other mfgr) knock sensor control? I assume your going with what ever scott has on his, but I can't remember his setup. For that matter, is your turbo a kit or a cobble together? Expected boost (i'm guessing 5 psi)?

You do know we are taking bets on how long it will take before you blow something up, right? Make sure you pay REALLY close attention to what scott says...his turbo is still running.

Bob
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Old 06-03-2002, 06:27 PM   #6
rhdude
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Bob-- yeah, I know about the bet....
I'm listening to scott as much as I can.... and He will tune the AFC right after the install... But I need to learn how to do it on my own BEFORE the install...
The kit is Steve's used Minnam stage 2.
I have already installed the SAFC(with Steve's help), and I did the EGT and boost gauges myself... yes, I will be running 5psi....

This ought to be something tho, cause I have the DOHC phase I block, and a 4EAT....

I made this thread cause I just saw that article, and was told by most people on here that you can't vent to atmosphere, and as Scott once told me, "when someone says you can't do something to a subaru, you can, you just have to think how, and execute"....... like his SVX-TT motor'ed XT, or the lifted unibody BRAT....


Now, how about a RS-TT, not like the FAT kit, but making dual throttle bodies and running parralel turbo's.... Scott said thats how his XT was set up, and thats what I eventually want to do with a ej25 or ej22 w/ the ej25 heads..... as a project engine... so when I blow this one I can use that

I figure in a year or whenever, after I take some auto Tech classes at NOVA, I want to find a wrecked L, and build that motor... paeco makes ALOT of parts, even ask Scott.... then I can throw on 2 Saab 900 turbo's or whatever I can find for cheap...
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Old 06-03-2002, 06:39 PM   #7
elgorey
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Quote:
I figure in a year or whenever, after I take some auto Tech classes at NOVA
Good call. Im taking them now (slowly......one at a time)
and they are great. Talk to me whenever you are ready to register, and Ill tell you the teachers to take.
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Old 06-03-2002, 10:08 PM   #8
Pipercub
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The airflow out of that turbo is certainly more violent than the airflow through the intake. It appears they inserted it after the airflow was made more uniform by the intercooler, not feasable on our car. That leaves mounting it before the IC and I see several problems with this.

1. The maf will be subjected to a violent airflow from the turbo.

2. The air will be much hotter after being heated and most probably outside the range the MAF is designed for.

3. The pipe size would have to be calibrated and that would necessitate a redesign of the turbo to IC tract.

All in all, a very questionable change for no gain in performance. The very definition of rice itself.


Yes the SAFC does have an adjustment for the vent to atmosphere but it is often less than fully effective.
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Old 06-03-2002, 10:10 PM   #9
Pipercub
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"You do know we are taking bets on how long it will take before you blow something up, right?"

I want in on that action, who is the bookie?

Brian is actually listening to us slowly, after acting like a spoiled kid. Of course getting him to listen and take advice is like beating a doberman to death with a roll of paper towles.
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Old 06-04-2002, 12:07 AM   #10
TaiChih
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Old 06-04-2002, 09:09 AM   #11
Bob O
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BRP

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Quote:
Brian is......after acting like a spoiled kid
No...<gasp>...not Brian, I simply cannot believe that. Who would ever think that Brian would be accused of such a thing...tsk,tsk...Mr. Pipercub

And no you can't get "in" on the action, your doing the install, and can "tweak" things to go in your favor. Like make the car only run 1 psi of boost while running really, really rich, so it will run forever.

BTW the bet also covers Brian getting arrested for street racing or stacking the car into a tree/building/another car or someone kicking his ass for telling them every five minutes that he has a turbo and they don't.

Bob
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Old 06-04-2002, 09:42 AM   #12
rhdude
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eh, I asked if we could do the install sooner, and run say 3psi, but they explained to me you cannot do that due to the wastegate spring being a 5psi one.... Oh well, I can wait... I also want my car fixed before the turbo gets put on.... i want the car looking nice for the turbo, not body damaged...
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Old 06-04-2002, 12:19 PM   #13
Impreza Rider
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Default

Don't like the sleeper look?


Not that your car looks like a sleeper anyway
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