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Old 01-05-2003, 02:06 AM   #1
rlavalle
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Default How do you tune a BOV? (APS 50/50)

Does anyone know how to adjust the APS 50/50 Blow Off Valve?

I imagine you need to tweak where it starts to blow off pressure... maybe for both Intake and Atmosphere sections.

I've got what feels like slow boost recovery between shifts on a Stage 4 setup. I'm wondering if the BOV isn't adjusted properly.

Thanks,
Russ
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Old 01-05-2003, 02:11 AM   #2
David@Vishnu
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Step 1: take it off
Step 2: Put stock back on

HEHE just hijacking Im really not polished on BOVs. Someone answer this man
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Old 01-05-2003, 04:17 AM   #3
Uncle Scotty
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I can't help with the tuning bit, however...
...there are many who frequent this forum that are glad that they kept their stock BOV, after buying an aftermarket one....
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Old 01-05-2003, 04:23 AM   #4
rlavalle
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Quote:
Originally posted by Uncle Scotty
I can't help with the tuning bit, however...
...there are many who frequent this forum that are glad that they kept their stock BOV, after buying an aftermarket one....
Yep, I've seen many posts from people saying that the stock one is fine.

However, I think with higher boost pressures (18psi) and especially with the APS FMIC (it doesn't work with the stock BOV) I need the APS version.

Thanks,
Russ
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Old 01-05-2003, 01:26 PM   #5
jblaine
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I thought there was a fine-tune adjustment screw on the APS BOV.
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Old 01-05-2003, 01:51 PM   #6
rlavalle
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There is... but I'm looking for info on how to use it.

What does it control?
How do you test it?
etc.

Thanks,
Russ
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Old 01-06-2003, 03:20 AM   #7
PAWRX
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I have the same setup( APS FMIC & BOV.) At the top of the BOV is an alan screw and nut. Loosen the nut and turn the alan screw in to tighten and out to loosen. Basically go for a drive. Get it spooling at partial boost( like 5 or 7 PSI.) then quick let off the gas and listen. Tighten the BOV until you hear a kind of sputtering sound. Like a lot of the Supras get if you know what I mean. Then little by little back off the alan screw until you stop getting that sound and everything sounds normal. Hope this helps.
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Old 01-06-2003, 11:53 AM   #8
rlavalle
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Quote:
Originally posted by PAWRX
I have the same setup( APS FMIC & BOV.) At the top of the BOV is an alan screw and nut. Loosen the nut and turn the alan screw in to tighten and out to loosen. Basically go for a drive. Get it spooling at partial boost( like 5 or 7 PSI.) then quick let off the gas and listen. Tighten the BOV until you hear a kind of sputtering sound. Like a lot of the Supras get if you know what I mean. Then little by little back off the alan screw until you stop getting that sound and everything sounds normal. Hope this helps.
OK... so I'm looking for the BOV to actuate at just over 6 or so PSI...

Thanks!
Russ
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Old 01-06-2003, 04:23 PM   #9
zacek
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u r suppose to adjust the BOV piston so that it will shut just prior the car idles after a hard rev. up. For instance, loosen up the nut so that the alan screw can be adjusted. Have a friend power rev. the engine (takes about 3 or 4 gass throttle blips up to 4 to 5k rpms to get some boost while in neutral) and while u look at the external venting port in the BOV. Have ur friend power rev. the engine and let go and have him scream at u when the tach. reaches idling (750rpms). You will then see the piston go up and open to let the air out and when there is no more air it will juts drop back down. Adjust the alan screw so that the piston completely drops just before he shouts is idling. (about 0.5 seconds before). WHen adjusted porperly u will see the piston sometimes vibrate (slightly move) up & down as it idles.

Otherwise just email APS for a quick manual.
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Old 01-06-2003, 05:01 PM   #10
rlavalle
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This for the 50/50 BOV as well? I'm guessing that there must be some line where the BOV vents to the intake vs. the atmosphere. Maybe this part isn't adjustable.

Thanks for the info!
Russ
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Old 01-06-2003, 05:07 PM   #11
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Russ, if it were me, I'd contact APS.
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Old 01-06-2003, 05:15 PM   #12
rlavalle
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Quote:
Originally posted by jblaine
Russ, if it were me, I'd contact APS.
Me too... looking for an email address on their web site right now.

Lack of documentation is one of the risks of buying used... got a great deal though. APS FMIC, CAI & BOV for $1200.

Thanks,
Russ
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Old 01-06-2003, 09:07 PM   #13
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You can go here and try the 'Email' link maybe.

Other than that, it looks like their web form is the only electronic contact method
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Old 01-06-2003, 09:36 PM   #14
rlavalle
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Quote:
Originally posted by jblaine
You can go here and try the 'Email' link maybe.

Other than that, it looks like their web form is the only electronic contact method
Cool! I sent an email via the form on their web site. But this way looks better.

Thanks,
Russ
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Old 01-07-2003, 04:19 AM   #15
PAWRX
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I got my BOV new in a box w/ the FMIC. Mine didn't have instructions either. Please post here when you get word from APS.
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Old 01-07-2003, 01:12 PM   #16
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not to hijack this thread or anything, but I was thinking about going with the new aps fimc(d/r500). Is this the one you guys have? If so, what do you think of it?
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Old 01-07-2003, 01:29 PM   #17
rlavalle
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Quote:
Originally posted by 1quiksoob
not to hijack this thread or anything, but I was thinking about going with the new aps fimc(d/r500). Is this the one you guys have? If so, what do you think of it?
I don't think the new version is released yet. I have the original version and love it!

Fits the stock bumper like a glove with no bumper structure cutting... You just need to bend down a strip of metal on the radiator support and trim plastic off the bumper skin.

Very robust!

Maybe I'll post photos of it installed. I don't have the fog covers painted yet, so you see the aluminum pipe/Silicone pipe junction. Looks pretty tough, actually.

Russ
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Old 01-07-2003, 04:14 PM   #18
PAWRX
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I have the original one that doesn't require bumper beam cutting. That was the whole reason i got it. You can see a picture of mine at the Tri-State suby gallery.
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Old 01-22-2003, 07:25 PM   #19
03GLHWRX
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Default Did you hear from APS?

Any answer from APS? I have the same question and intended to start a thread asking the same question, but searched and found this one. Please PM me if you have definitive info.
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