So I have done my research and listened to those around the board and have come up with the fact that the stock WRX and STi BPV are the same. Now I ask what PSI are they good to. I have heard 23 with out modifications ... can this be done?
Do you really want that choppy air going back to the turbo when the throttle slams shut between shifts...while creating that kind of boost?
wait, what!??!?!?! You can't tune for th3 psshhhhh? :biggrin: that's why i have the twin vent APS. not issues with idle or rich condition between shifts due to it recirc. the air....and only at WOT does it vent to atmosphere
i have a full vent to atmosphere BOV and i was able to "tune" for it. i dont know what part of my tuning did it but before the tuning the car would stumble a lot at low idle, now i have no problems at all.
just a heads up, the ej205 and ej257 have different part numbers for the BOVs, that would indicate them being different.....
Unpossible. The ECU always just expects the air to be reinserted after a shift, this is not editable. As a side note, even the stock BPV goes rich between shifts.
It does go rich between shifts, yes, but when i first got the car with an RFL on it, it would stuble at idle and die quite often, after i tuned the car i no longer get the idle problem.
It all has to do with the driver and how/when they let off the gas vs stepping on the clutch. In all the cars I have tuned, I have seen it all and the only thing I can come up with is the driver. I have tuned cars with one person driving and not having a problem. They hand the car over the the owner and all they had was problems. I can definitly say, that not all cars will go rich between shift, but most will. Usually the cars the "pop" alot between shifts are the ones that are NOT going rich. Russ
Yeah, it was metered SEVERAL INJECTOR CYCLES BEFOREHAND. The ecu basically guesses as to how much extra air is going back in between shifts.
mines goes pop pop pop when cruising down the street with no gas applied. what is that? O I C...thanks
That is when it is going lean. Certain AFR's will ignite just from the heat around it, so what usually happens is when you left off the gas, if you let off BEFORE you push in the clutch, you are creating a lean condition. The lean condition will ignite in the turbo/header/uppipe/downpipe and give you the pop/explosion. The people who are getting the fireballs is a combo of the lean condition with some extra fuel in the exhaust. So the lean part starts the explosion, and the rich exhaust just keeps the fireball moving down the exhaust and out the tail pipe. Like in my car. With the auto tranny, the ecu cuts the injectors for the shifts (to reduce HP/TQ to ease up on the clutches). So at WOT and my car shifts, it sounds like a rally car with a good 3-5 pops but no fireballs. Russ
you cannot do 100% atmosphere unless you relocate the MAF to the spot after the BOV, am I correct? you cannot meter air that is going away into the atmosphere or your motor will be missing it
That's called engine braking. Like Russ stated, it's a lean condition. You don't have much for fuel, and your engine is still under partial load because it's stopping your car. It's normal for any car, most you just don't hear because of cats/quiet mufflers. Bike's with exhaust sound even better!:biggrin:
