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Cobb's take on DCI vs. stock air box (article)
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09-04-2011, 10:43 AM | #1 |
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Cobb's take on DCI vs. stock air box (article)
I hope this is not a re-post. Take it as another data point for the dci vs. stock air box debate.
I wonder if the superiority of the stock air box will still hold for a stage 2 car. http://blogs.cobbtuning.com/2011/06/...ir-box-vs-dci/ Last edited by riceygts; 09-04-2011 at 10:48 AM.. |
09-04-2011, 10:54 AM | #3 |
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First and foremost a dyno does NOT replicate the air flow of real world roads and highways so the debate is negligible.
What is important is removing the restriction of the stock air box and anyone can easily agree on that. However you do that is up to you. Naturally, an intake breathing better and colder air would be ideal. |
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09-04-2011, 11:22 AM | #5 |
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This one has been beaten to death, DCI's are not optimized when sitting on a dyno with no where near real world air flow. DCI's prevail over the stocker when driven under load and experiencing proper air flow.
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09-04-2011, 11:32 AM | #6 | |
My X5d tows my spec miata to the track.
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I showed that at the track on stg1 the dci performed worse. http://www.e90post.com/forums/showthread.php?t=491005 The best intake for this car is the mr. 5 intake. My logs of it vs the stock box are here: http://www.e90post.com/forums/showthread.php?p=10352970#post10352970 |
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09-04-2011, 11:58 AM | #7 |
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In their testing they made the most power with the airbox lid removed which is functionally equivalent to a DCI. They are also using load targeting tuning that will just arise the boost should air intake temperatures increase. Their testing was internally inconsistent and flawed.
Mike |
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09-04-2011, 12:29 PM | #8 | |
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Then how come mr used the dci when he was at the track?? The stock airbox is garbage !!!The stock box is for stock cars . |
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09-04-2011, 01:49 PM | #9 | |
My X5d tows my spec miata to the track.
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Do yourself a favor and actually read the posts before commenting... |
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09-04-2011, 02:15 PM | #11 | ||
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By your logic I could slap in even bigger DCI's than BMS sells and make even more horsepower. Which we all know is false. What you are forgetting is that the runners that connect from the intake to the turbo's is flat and pancaked in the engine bay. So you can only flow so much more air before those runners become restrictive. Also boom is running the Mr5 intake not the stock box read the post. Quoted from Mr Terry himself seller of the BMS DCI Quote:
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09-04-2011, 02:21 PM | #12 | ||
My X5d tows my spec miata to the track.
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09-04-2011, 02:26 PM | #13 |
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All of this reminds me of the CAI vs Stock Airbox discussions in the VW/AUDI world from about 10 years ago when they introduced the 1.8T (Nevah' Loose) engine.
I've been saying this for a while now, but I'll repeat it again: the best flowing intake would be gutted and smoothed out stock air box with drop-in performance filter. Dinan intake and Mr.5's intake mod are also excellent solutions as well!
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09-04-2011, 02:28 PM | #14 |
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The Simota..I run it..its actually very good..I log my air intakes temps..and as soon as the car is on the move the temps drop rapidly..I have ran it wit both the lid on and off. and the temp differences are significant
Simota and the new AFE sealed box are prolly the best intakes for alleviating heat soak issues..and still removes the stock box restriction The Mr 5..Dinan style is prolly the best option..but out of the question for me due to rain and flooding in NY..these cold air intakes are safe to run in dry climates..but not in wet climates |
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09-04-2011, 02:35 PM | #15 |
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These are Forced induction cars..if on an NA platform then air filter sizes would matter greatly..not as important on an FI..
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09-04-2011, 02:50 PM | #16 |
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These styles are NOT a problem in wet climates.If the lower pipe where to become restricted the engine would get all the air it needs from the upper stock intake - especially at the low speeds you should be going if there was that much water present.
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09-04-2011, 02:57 PM | #17 | |
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http://www.nissanraceshop.com/image/...6576-rnz36.jpg check that out... why has nobody put a valve in on a MR.5 intake im in ny too flooding is a issue around here |
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09-04-2011, 03:04 PM | #19 |
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Tell that to my buddy who had a CAI that got completely water logged..and hydrolocked the engine on his G35...no way am I running a CAI here..if I lived in a desert climate or place where it rains a few times a yr then maybe
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09-04-2011, 03:15 PM | #21 |
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tibra1,
It seems that you don't understand the simple principles of fluid dynamics. Your buddy got his engine hydro locked with the CAI because the air has only one path to the engine: through the CAI. Both Mr.5 intake mod and the Dinan intake add an additional air source. If water completely submerges the intake filter in the fender area, the engine will still be fine because air will be sucked in though the stock intake tract above the kidney grilles.
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09-04-2011, 03:20 PM | #22 | |
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