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Old 04-05-2005, 07:06 AM   #1
BlackoutWRX
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Default tuning for a blow off valve?

i see many many guys with front mounts with bovs, and a few different friends have told me that theyve tuned there wrxs to be able to run a bov with no negative effects( except probably boost leak i guess) Both of them have utec. now, it this possible to some how "tune" for a bov or is that just a load of crap?


and while im on the subject of fuel/ ecu tuning, when you install an aftermarket intake, does that make you run lean? ive seen the intake faq, and it just says that it alters the fuel/ air mix. is this something you can tune for as well if you have utec?
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Old 04-05-2005, 11:04 AM   #2
mbiker97
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Load of crap. Unless you eliminate the MAF there is no tuning to get around the BOV stumble. Now if you used a partially recirculating BOV that adjusted you could "tune" the BOV to give a good median.

If you have a Utec you can tune for an intake. The problem with most intakes is that the MAF tube is larger than stock so the ECU thinks x amount of air is coming in when it's really more than that.
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Old 04-05-2005, 11:04 AM   #3
BadTrip
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Load of crap...

and...the only reason you'd need an intake is if your engine can move a substanially larger volume of air than the stock engine.
CAI is not userful for our cars. Shorty intake, etc, CAN be useful if the engine needs better intake flow. The stock intake is good for at least 350hp engines.

That's my opinion and I'm not an expert.
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Old 04-06-2005, 09:56 PM   #4
feiron
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Quote:
Originally Posted by BadTrip
Load of crap...

and...the only reason you'd need an intake is if your engine can move a substanially larger volume of air than the stock engine.
CAI is not userful for our cars. Shorty intake, etc, CAN be useful if the engine needs better intake flow. The stock intake is good for at least 350hp engines.

That's my opinion and I'm not an expert.
the topic is on BOV here

regarding bov, I cant think of a way to tune for a bov (with a utec at least) Try to tune the fuel map to reach the target AFR. BOV only cause you to run rich for a short time. Not enough to make you stuble if the AFR is right.

dont add too much fuel on the 0% column to avoid shift knocks. I use flat timing accross the load sites above 4750rpm to get rid of those shift knocks.

the reason why BOV on stock impreza is a no no is because bone stock imprezas run pig rich (but I'm sure most ppl know that)
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Old 04-07-2005, 09:35 PM   #5
$leeper
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When going to an aftermarket BOV to atmosphere do I need to go to a piggy back tuner or a reflash?

From what some of the above posts it sounds like even with a tuner there is no getting rid of the rich condition when pressure is released.
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Old 04-07-2005, 11:19 PM   #6
yergi
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they are probably just talking about adjusting the tension on the backpreassure of the bov. it's not really "tuning" though.
Do you need to go with aftermarket EM for a bov?
Nope.
You should first ditch that up-pie cat though.

-yergi
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