blow off
10-30-2005, 07:38 PM
#12
Since no one else wants to be nice to the NOOb, i'll play devils advocate...
Listen guy, the reason everyone is making such a big deal about this is simple: The design of the intake air charge system on our 1.8t's is such that purging air from a BOV to the atmosphere, instead of recirculating it as intended by the Stock setup, will cause an instant RICH condition.
This is due to the fact that the ECU is measuring the amount of air comming into the engine directly out of the AIRBOX. This measurement is taken at the Mass Air Flow Sensor (or MAF). When your release the throttle, vaccum pressure opens the diverter valve which diverts the pressurized air back into the intake track before the turbocharger so that the air stays in the charged air system. This also reduces the shockwave effect from reaching the compressor wheel and damaging the turbocharger.
Blowoff valves (or BOV) work on cars like the SRT-4 due to the location of their MAF sensor. If the air is being Metered post BOV, then there is no problem with purging it to the atmosphere.
At this point, I leave the decision up to you. If you want that cool wooshing sound do what you have to do. But take this small bit of advice I impart upon you: think about what you do to your car. Is it for your own satisfaction, or for others?
Everything I do for my car and learn about my car is for my own enjoyment, not to prove anything to anyone else. If you want to make your intake go WOOSH to get that funny feeling in your pants, then by all means go for it. But, please don't do it just to stand out that little bit more in the crowd. Far too much work and engineering went into these awesome cars to have some nitwit blow out his turbo/exhaust due to a little Woosh desire.
my .15 cents
This is due to the fact that the ECU is measuring the amount of air comming into the engine directly out of the AIRBOX. This measurement is taken at the Mass Air Flow Sensor (or MAF). When your release the throttle, vaccum pressure opens the diverter valve which diverts the pressurized air back into the intake track before the turbocharger so that the air stays in the charged air system. This also reduces the shockwave effect from reaching the compressor wheel and damaging the turbocharger.
Blowoff valves (or BOV) work on cars like the SRT-4 due to the location of their MAF sensor. If the air is being Metered post BOV, then there is no problem with purging it to the atmosphere.
At this point, I leave the decision up to you. If you want that cool wooshing sound do what you have to do. But take this small bit of advice I impart upon you: think about what you do to your car. Is it for your own satisfaction, or for others?
Everything I do for my car and learn about my car is for my own enjoyment, not to prove anything to anyone else. If you want to make your intake go WOOSH to get that funny feeling in your pants, then by all means go for it. But, please don't do it just to stand out that little bit more in the crowd. Far too much work and engineering went into these awesome cars to have some nitwit blow out his turbo/exhaust due to a little Woosh desire.
my .15 cents
10-31-2005, 04:02 AM
#17
Guest
Posts: n/a
For the record, intalling a BOV in an SRT-4 voids warranty.
Even the MOPAR part. I konw, I have denied claims because of it.
Very few cars seem to benefit from a BOV instead of a BPV.
My Conquest needs one, as have a MAF from a car that has a BOV. When I lift and the turbo stalls, I get a bad surge.
Meh.
Very few cars seem to benefit from a BOV instead of a BPV.
My Conquest needs one, as have a MAF from a car that has a BOV. When I lift and the turbo stalls, I get a bad surge.
Meh.
