blow off valve??? July 05, 2006, 12:16:11 PM can you install a blow off valve on the stock 2.3 setup. if so how would i go about that! im very mechanically inclined just not really keen on the turbos yet but im gettin there! Quote Selected
blow off valve??? Reply #1 – July 05, 2006, 12:26:20 PM Yes you can. Most (if not all) tap into the intercooler. It really depends on your bov as to how you would mount it. Quote Selected
blow off valve??? Reply #2 – July 05, 2006, 12:41:47 PM From what I've read installing a BOV after an air metering device and before the T/B can cause stumbling problems when you go back into throttle. Quote Selected
blow off valve??? Reply #3 – July 05, 2006, 12:55:38 PM I'd just use a BPV (recirculating) on a stock set-up. Quote Selected
blow off valve??? Reply #4 – July 05, 2006, 07:24:06 PM I thought the stumbling/stalling was caused by the bpv/bov staying open. Quote Selected
blow off valve??? Reply #5 – July 05, 2006, 07:27:44 PM Shawn would be the one to talk to about this he seems to know quite a bit about turbo setups Quote Selected
blow off valve??? Reply #6 – July 05, 2006, 08:26:40 PM Quote from: darkthunderI thought the stumbling/stalling was caused by the bpv/bov staying open. Think of it this way.. Boost is up You let off the gas Bov opens Air meter is still reading as much air as it was when the throttle was open. Enough fuel is still being injected for that amount of air. When you open the throttle again there would be a rich condition caused by this scenario. Stumble.... Quote Selected
blow off valve??? Reply #7 – July 05, 2006, 08:46:26 PM You need to reroute the air coming out of the valve back in somewhere between the turbo and air meter otherwise it creates a momentary rich condition. Quote Selected
blow off valve??? Reply #8 – July 05, 2006, 08:51:52 PM Convert to a blow through VAM... Quote Selected
blow off valve??? Reply #9 – July 05, 2006, 09:13:39 PM I didn't say it wasn't possible to use a BOV on a stock system, but for the way the stock stuff is set up, a BPV works better.You can use a BOV if you want to deal with the "quirks" Quote Selected
blow off valve??? Reply #10 – July 05, 2006, 10:49:12 PM might be a dumb question but what is a blow through vam? Quote Selected
blow off valve??? Reply #11 – July 06, 2006, 11:29:52 AM A stock TC sucks air through the air meter, under the air box into the turbo. Some guys convert the setup so that the VAM (air meter) is in the charge pipe going to the intake. What you can do with that is install a BOV in the charge pipe, but before the vam. When the BOV opens it will vent the excessive pressure but before the air meter... so the air meter still reads the correct amount of air going into the engine. Quote Selected
blow off valve??? Reply #12 – July 06, 2006, 04:49:41 PM Quote from: CougarSEThink of it this way.. Boost is up You let off the gas Bov opens Air meter is still reading as much air as it was when the throttle was open. Enough fuel is still being injected for that amount of air. When you open the throttle again there would be a rich condition caused by this scenario. Stumble....I get that. All I am saying is that occurs in BPV and BOV setups. Less often in BPV of course, but it occurs none the less. Inferior components and improper setup (not allowing the valve to close) are usually main causes. After reading numerous topics on the issue, I have concluded that no one is really certain of the momentary rich condition between shifts. It seems to be a myth that gets passed around much like the 8.8 vs. 7.5 weight myth. Personally I would just ditch the VAM (which is to blame) for a MAF and be done with it but then that wouldn't be stock. :p Quote Selected
blow off valve??? Reply #13 – July 06, 2006, 05:28:43 PM so do we really need the vam? Quote Selected
blow off valve??? Reply #14 – July 06, 2006, 06:03:57 PM Alright, i have a blow off valve on my car, and i know the Pro's and Con's.Pro's: -easier plumbing-neat sound-cleaner appearanceCon's:-DrivabilityThe momentary rich condition happens wether the car is stock, or if its running a BOV. Thats a myth, but the stumble and stall issues are not a myth. Ive adjusted my driving around those issues, but anyone else who would hop in my car would stall it out once they got into boost.The biggest issue is that when the air vents, theres nearly enough fuel being shot into the cylinders to momentarily foul the plugs, so if youre in boost, you cant press the clutch and let the car idle, it will immediatly stall. I let off the throttle, and stay in gear for a bit, so that it will clear itself out.Another issue is starting it. The engine vacume will yank the BOV open since theres not much suction in the intake tubes at that moment, and itll sometimes stumble and stall. Also, sometimes coming to a stop, itll want to stumble and stall, unless i ride out the gear. MAF or VAM, the issue will persist, youre still venting metered are, regardless of how its metered. The only way to solve the problem is to run a bypass setup, or convert to blow through. Quote Selected
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