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DINAN Throttle Body vs Stock Comparison
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11-09-2006, 05:37 PM | #1 |
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DINAN Throttle Body vs Stock Comparison
Just installed today. Will dyno when time permits.
I cropped and resized the photos to the same dimensions. Photo 1: OEM top (76mm I.D.), Dinan bottom (79mm I.D.). Photo 2: Dinan top (40% opacity), OEM bottom (100% opacity) |
11-09-2006, 05:43 PM | #3 | |
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11-09-2006, 05:45 PM | #4 | |
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can't wait to see the dyno |
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11-09-2006, 10:21 PM | #5 | |
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CDV mod, OEM BMW Strut Bar, OEM Aluminum Pedals, OEM Short Shift Knob, OEM Alarm, Rear Fog Lights, Rear Power Outlets
Next mod...Intake(Dinan or Gruppe M), Rogue SSK |
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11-09-2006, 11:41 PM | #6 |
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what does the opacity mean?
edit: and I know the definition of the word...I mean in this context.
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11-10-2006, 12:19 AM | #8 | |
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11-10-2006, 12:57 AM | #9 | |
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11-10-2006, 01:39 PM | #10 |
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3mm lets that much more in? I'll repeat Hunter's sentiments... if not his verbal eloquence.
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11-10-2006, 01:43 PM | #12 |
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but froggy has 3 (?) different companies...
gruppe M intake, Dinan throttle body, and stock(?) exhaust. How's software gonna take all of that into account?
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11-10-2006, 01:58 PM | #13 | ||
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The surface area of the OEM 76mm bore is pi*r^2 = 4536.5 mm^2 For the aftermarket 79mm bore, the surface area = 4901.7 mm^2 Now imagine a square hole almost 2cm x 2cm large. That's the additional surface area that will theoretically allow more air in. I'm not sure this would translate into better engine breathing, or diminished air speed velocity. One should not expect dramatic improvements on a normally aspirated engine with intake and exhaust mods, but it's my hope that the sum of each improvement would make some difference. I'll dyno test next week. Last edited by ksfrogman; 11-10-2006 at 06:35 PM.. |
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11-10-2006, 02:08 PM | #14 | |
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I'm sure intakes and exhaust are all pretty close, plus the frog's right about the computer adapting itself a bit |
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11-10-2006, 02:14 PM | #15 | |
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http://www.e90post.com/forums/showpo...1&postcount=95 The opening toward the bottom brake duct area means that if the driver's side bottom grille were opened, cold air would get to the K&N air filter. As for the throttle body, forget for a moment that it's a "Dinan." It's a stock BMW throttle body that has been bored out a little bigger with a bigger valve. Dinan's claims are a mere +5 hp max and +4 ft-lbs torque, and I am assuming this is at the wheel. |
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11-10-2006, 06:48 PM | #16 | |
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11-11-2006, 07:17 AM | #17 | |
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11-11-2006, 11:49 AM | #18 |
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I don't feel like this mod is worth the $. If it was 1/5th the price, then we can talk, or if it's part of a COMPLETE intake system, from the filter all the way to the intake ports (which would ASLO get port/polished) then I'd expect moderate gains.
If just boring out the thottle body was worthwhile for some horsepower, and won't harm mpg too much, why wouldn't BMW have just produced a wider mouth tb?? |
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11-11-2006, 01:05 PM | #19 |
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The cylinder head and intake ports already look polished and port-matched.
There's an old saying that I think applies here. There are three potential sources of misinformation: the media, your friends and relatives. Listen to the latter two and ignore them all. Everything is speculative; let the dyno speak for itself. |
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03-23-2007, 12:31 PM | #20 | |
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It is important to note however, that the throttle plate is not removed, but rather defaults to a fully open position once the engine is running. Pulled this from here http://en.wikipedia.org/wiki/Valvetronic Makes sense to me |
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03-23-2007, 12:37 PM | #21 | |
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Dinan took the OEM throttle body and widened it. The inner diameter is slightly bigger, as is the butterfly valve. The new N52 and N54 engines use a ceramic material for the valve and a different triggering mechanism. |
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03-23-2007, 01:41 PM | #22 |
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I thought it'd be interesting to note...
The N52 produces almost zero manifold vacuum. It actually has to use a vacuum pump, run off the timing chain, to produce enough vacuum to run the brake booster and the exhaust flap. |
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