Thoughts on intake flow rates etc......and filters. - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 09-13-2004, 12:45 PM   #21
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In our case for instance, the L27 and L67 Series 1 use the same stock filter size. Is it possible for the L67 to outflow it? Since we're pulling more CFM'*?

Is a filter more sensitive to higher flow rates than NA rates?

Come to think of it, there'* alot of different variables in our application. ADTR dyno'd and benchflowed different bends and pipe diameters and found differences. Our TB setup is quite different than a carb in flow capability, not to mention the intake manifolds. Does a cone flow more efficiently than a flat filter of the same area? And on and on.

This test was a good indicator for that type of setup, but how much really applies?
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Old 09-13-2004, 08:45 PM   #22
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eventually you will be nit picking. IMO anything under like 4-5hp isnt worth it.
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Old 09-13-2004, 09:00 PM   #23
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When you start running a car at the track, every SINGLE hp makes a difference. You go after the common things first, then you start trying to tweak out every last fraction of a second.
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Old 09-14-2004, 11:49 AM   #24
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Quote:
Originally Posted by willwren
In our case for instance, the L27 and L67 Series 1 use the same stock filter size. Is it possible for the L67 to outflow it? Since we're pulling more CFM'*?

Is a filter more sensitive to higher flow rates than NA rates?

Come to think of it, there'* alot of different variables in our application. ADTR dyno'd and benchflowed different bends and pipe diameters and found differences. Our TB setup is quite different than a carb in flow capability, not to mention the intake manifolds. Does a cone flow more efficiently than a flat filter of the same area? And on and on.

This test was a good indicator for that type of setup, but how much really applies?
Kind of curious how he flow tested the intakes as aparently it takes a massive machine capable of 3000cfm+ which isn't a "in your backyard" kind of thing...
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Old 09-14-2004, 12:09 PM   #25
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Hector ain't a 'in your backyard' kinda dude. He owns ADTR at the ripe age of 21, and has connections all over Simi Valley. All the good shops work together and use each other'* equipment.

Hector took it upon himself to quell the search for the 'answer' on intake diameters and angles. And spent alot of money doing it. In the end, he had to pull out of the (at that time) weak Bonneville market, and concentrate on the Crown Vic'* and WRX'*. Unfortunate.
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Old 09-14-2004, 12:15 PM   #26
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I didn't mean literally back-yard it just kind of struck me as interesting taking a quote from the filter dyno test:

"Westech'* burly, Pro Stock-capable Super Flow SF600 wasn’t big enough for the job. In fact, outside of Detroit engineering labs, few shops have (or need) a bench with more sucking power than an SF600." Which is why they had to use duct-tape over half the filter to get a "round about" number. Did you ever get a chance to see it?
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Old 09-14-2004, 12:19 PM   #27
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I've seen flowbenches before, but nothing that big, nor Hector'*. Hector may have started with a benchmark lower flow as a baseline for comparisons. Then again, he may have access to a large enough unit. Hell we have a couple flowbenches right here in town enough for a muffler comparison. That should be enough to do an intake, wouldn't you think?
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Old 09-14-2004, 12:23 PM   #28
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Quote:
Originally Posted by willwren
I've seen flowbenches before, but nothing that big, nor Hector'*. Hector may have started with a benchmark lower flow as a baseline for comparisons. Then again, he may have access to a large enough unit. Hell we have a couple flowbenches right here in town enough for a muffler comparison. That should be enough to do an intake, wouldn't you think?
No and not by a long shot. A filter flows upwards of 3000cfm+ while a muffler does around 2.2cfm per HP if matched correctly. Usually around 300-600cfm.
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Old 09-14-2004, 12:32 PM   #29
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I don't know enough about flowbenches to debate this one, but I DO know that Hector used a flowbench and dyno (on his own car) to determine the diameter, length, and bend radius of the ADTR intakes.

Then he used MY car to test them
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Old 09-14-2004, 12:36 PM   #30
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so here'* a question then.

since we're looking at this as a performance filter lowering the restriction that a motor faces, who stands more to gain? the forced induction folks who are already sucking the air like crazy into their motors, or us n/a folk, who don't have the super charger to aid in drawing air past restrictions?

may be something that would have to be tested, but it would seem that the larger % gains would be made by the n/a people, simply because we don't have that extra power to pull past any obstructions. or maybe it all works out in the end because restriction=restriction, no matter what type of induction is being used?

oh, and your q on the alternator - i'll dig up my physics 2 book and see if i can get you a more clear answer on that -

matt
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