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Old 07-06-2007, 03:32 PM   #1
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Purely Theoretical Question. Pressure

I need some input plz regarding boost and Duratec tune and fuel delivery system. This is a 'what if' question, so plz bear with me.
I am building a replacement 'box' for my Steeda SRI. The design is to bring cold air up from the dam (splash shield) thus eliminating one of the major gripes about SRI's. IF the new box were fully enclosed, then it would be possible that I could exceed a volumetric efficiency (VE) of 100 at times (by definition, turbocharged to some very very small degree). Question!!! Would/Could the stock tune/fuel delivery of a 2.0 Duratec be able to handle a VE of 100 or somewhat greater? Is there a known value of VE that represents a 'line in the sand'? I don't want to fit the pipe for the scoop and then find out it's to large.
Thanks Much!


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Old 07-06-2007, 04:12 PM   #2
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am i correct in thinking your going to build a ram air intake? Im going to say yes, your current tune will be able to handle it. You shoudn't need to change much untill you're getting pounds of boost (which i dont think a scoop could produce).
I'll let others chime in now
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Old 07-06-2007, 04:23 PM   #3
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Yes. A 'Ram Air' intake would be an accurate description. I am worried about things like oncoming trucks or driving in a very gusty wind conditions. I don't believe however that I would be anywhere near even 1 pound of boost worst case (Although I am having a devil of a time trying to calculate PSI from CFM at the intake. So it's still an unknown at this time).
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Old 07-06-2007, 04:40 PM   #4
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Originally Posted by S0C0nFused View Post
Yes. A 'Ram Air' intake would be an accurate description. I am worried about things like oncoming trucks or driving in a very gusty wind conditions. I don't believe however that I would be anywhere near even 1 pound of boost worst case (Although I am having a devil of a time trying to calculate PSI from CFM at the intake. So it's still an unknown at this time).
I had a ram air setup on my SVT. DEFINATLY gave it more top end on the highway. On the comment about gusting winds...

When I would have my cruise on say 75mph if a really hard gust hit the front of my car you could hear a quite noticable change in the exhaust note. Almost as if I was slightly pushing on and off the gas every time a really good gust hit. Never really had any problems though.

I did some testing with a fluke documenting meter along with a pressure/vac sensor in the breather inlet right after the MAF. There was a SLIGHT vac in the pipe on low end low speed pulls. Anything after 40mph maintained a +/-0 to +.1. On the highway the highest amount of pressure sensed in the tube was +.3 +.4 psi at around 90-95mph (too many state troopers on the highways in ohio 24/7 to go any faster).

So my end result was ram air WORKS.. just slightly annoying if your cruising long distances you will hear/feel a SLIGHT surge if your in really windy conditions when the MAF picks up that extra air gusting across it.

One other thing I need to add... INSTALL A SCREEN in your scoop or you WILL be taking it appart to pull feathers, acorns, rocks, and other random crap off your filter. And for god sakes watch for standing water with a sealed intake like that... its basically a shop vac sucking on the front of your car
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Old 07-06-2007, 10:47 PM   #5
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itbparada >> I hear ya on the screen. The actual design however is meant to foil 'deposit' of objects or water to the filter (integrated trap. Did not consider feathers however). It sounds like you achieved the magical 100%VE. That is my goal if possible. Oh! btw. The box will also have a 'vacuum breaker' should the intake become plugged (pesky squirrels). The total 'head' though may be a concern (head is how high a column of water can rise in a pipe via pressure or vacuum). But how do you calculate head when a good deal of the force is inertia?
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