maf install success!!!!!!...so far
#16
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Didn't the guy that originally did this dyno the car and it made less power with the MAF and never ran correctly?...so why are you doing this? You NEED some sort of translator to convert the signals, otherwise it might run correctly in some places and not in others. Sounds like a good way to blow an engine.
That and you need to recirculate your BOV as you are losing metered air.
That and you need to recirculate your BOV as you are losing metered air.
There really is no down side to it but if you know something different please let me know i always like learning new things
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prossi,
Once the air passes the AFM/MAF, then the air has been metered by the DME. If the BOV is vented to atmosphere then that metered air never enters the engine. This causes a momentary rich condition, as the DME thinks that air is entering the engine, and provides fueling as such.
Usually this isn't a problem, but the proper way would be to re-route the BOV to the intake - post AFM/MAF.
You have a PM.
-Rogue
Once the air passes the AFM/MAF, then the air has been metered by the DME. If the BOV is vented to atmosphere then that metered air never enters the engine. This causes a momentary rich condition, as the DME thinks that air is entering the engine, and provides fueling as such.
Usually this isn't a problem, but the proper way would be to re-route the BOV to the intake - post AFM/MAF.
You have a PM.
-Rogue
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really? i guess im not really understanding this concept since im so used to stand alone systems, if you dont mind can you please elaborate on this concept?
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Its no different on standalones. Ok, so since the BOV is after the MAF, the ECU is fueling the amount of air the MAF sees. But if you release some of this air (metered air) the engine will supply too much fuel for the amount of actual air, because it was released from the intake via the BOV. The purpose of a BOV is to release the air in the intake before it backs up when the throttle body is snapped shut. So when you vent the BOV into the intake maniflold, the throttle body is bing bypassed, and the metered air is kept.
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well thanks for expaining ive always seen custom turbo builds with the BOV vented to atmosphere including my other car and i have no issues like this with it, . guess this is another thing ill have to test on the dyno....man im going to be on that thing for a long time
Last edited by prossi; 05-07-2009 at 12:41 AM.
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Yeah, MAP sensors aren't a problem when dumping to atmosphere. You can have a BOV with a MAF car so long as you run a blow-thru setup (MAF goes between compressor and throttle body with BOV before the MAF)
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Well atmosphere venting really isnt to bad. You'll just be running very rich while the BOV is venting. But its really not hard to just tie it into the intake after the throttle body.
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You don't want it to... at least not yet. The BOV simply diverts the air to circulate in the intake piping pre-throttlebody 2 pre-turbo. The BOV is there to allow the turbo to 'freewheel' when the throttle-plate closes.
-Rogue
-Rogue
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Yes i understand that, but if the metered air is never getting past the throttle plate, then wont the mixture be just as rich as if it were just vented out of the intake? The targeted mixture cant be acquired if the air isnt getting into the engine.
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The air will get into the engine, it is just delayed for the short time that the TB is closed. And going slightly rich during drop-throttle is normal.
-Rogue
-Rogue