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I made a new thread cause I didn't want my question/concern to get lost in the pics thread.
Anyhow I noticed the MAF is before the turbo. Now my concern is the MAF meters in air, the turbo compresses it, sends it through the intercooler where the blow off valve is, you take foot off gas, blow off valve sends air out, so basically air that was metered to go in by the MAF ends up getting vented to the atmosphere. Will this have any adverse affects? WIll the ECU do some bad things to me?
(my knowledge of turbos is fairly limited so please don't mock me)
2000 Cougar V6 MTX Black Visteon GFX Kit with Razzi rear skirts, Ground Controls, YoDude Exhaust, Ractive Filter, Custom Interior, Custom Loud Stereo, and more... See Her Here
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Good question I was wondering the same thing...
98 V6 Lots-o-mods SOLD
88 Daytona Shelby Z TII (The beast)
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The BOV vent tube is not plumbed right now. It causes some stumbling when you let off the gas at WOT, but it runs fine otherwise. Right now we aren't boosting it up high enough to open that valve very much. Yes, good question. 
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so in other words, it is really a bypass valve, and excess intake tract pressure is not vented, but routed back to before the turbo?
It's all about balance.
bcphillips@peoplepc.com
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Originally posted by Rara:
so in other words, it is really a bypass valve, and excess intake tract pressure is not vented, but routed back to before the turbo? Right now, it is a blow-off valve. As soon as we connect the tube, it becomes a bypass valve :p
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Originally posted by Chris Hightower: Originally posted by Rara:
[b]so in other words, it is really a bypass valve, and excess intake tract pressure is not vented, but routed back to before the turbo? And it will run better! Good work Chris. 
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ok .... since you are working on that issue, i'm sure it will be working properly.....
2000 Cougar V6 MTX Black Visteon GFX Kit with Razzi rear skirts, Ground Controls, YoDude Exhaust, Ractive Filter, Custom Interior, Custom Loud Stereo, and more... See Her Here
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FWIW a MAF is not the ideal air metering for any forced induction set up as it has no clue when the intake hits positive(boost) pressure unless the system & calibratin has an input from a MAP sensor.Most low boost systems 'bluff' the processor with a combination of TPS & MAF inputs to trigger a spark retard and fuel increase with no sensor input ie no MAP sensor.
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This is why the VAG 1.8T engine has both, a MAP sensor and a MAF sensor. Due to surging problems, many people on the VW boards have disconnected their MAFs with great results ... seems the MAF sensor is too sensative when going beyond stock boost levels 
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The MAF is the best way to tune and the intake does not need to know if it is under boost
The biggest problem is people do not understand how the MAF works and how to use it tuning
i am running a set of 96 LBS injectors and a 70mm ported mass air with the stock ECU ,no idle problems at all ,no spk nock, and useing 65% of the injectors
tom
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