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Old 01-19-2012, 11:16 AM   #11 (permalink)
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So yesterday I went through a few stages of grille blocks.

First off I made a top grille block by gluing glossed rubber to the back:


However after seeing some other blocks, I did a little bit of CFD and discovered that the blocked version still created turbulence and drag. So I decided to go for a full on cut to size and smoothed in version.



By the way this material is actually armoured mudflap rubber which I bought for my Subaru and didn't fit






I knew I'd be ecomodding this car, and now I'm REALLY glad I decided to get it in black!

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Old 01-19-2012, 11:35 AM   #12 (permalink)
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Here's a shot of the CFD from the first blocked (but not smoothed) grille.

All the twisty turbulent red velocity lines are bad, even if it's only on a small area I'd rather not have my grille creating drag.

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Old 01-19-2012, 12:21 PM   #13 (permalink)
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That really looks nice with the smooth lines of the Polo. I take it the Polo doesn't have the engine air intake at the top slat of the grill like my Golf does? (I left one side of the top grill bar open for that reason.)
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The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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Old 01-19-2012, 12:34 PM   #14 (permalink)
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Oh and remember to take out the rear muffler. It should help a lot.
I did this on the diesel Golf and replaced it with a straight pipe. I don't have any test data to show if it helped horsepower or mpg but it didn't hurt any. The noise level in the cabin is virtually unchanged. With the turbo and the cat dampening the exhaust pulses it is not loud.
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The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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Old 01-19-2012, 12:34 PM   #15 (permalink)
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It does, but I've removed the cold air feed so the airbox takes air straight from the engine bay. It'll help the car warm up faster on short journeys and I'm not bothered about slight power drop. Intake temp monitor reads about 15c, so about 10 degrees above ambient.
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Old 01-19-2012, 12:57 PM   #16 (permalink)
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Upper block looks very nice! Great job!
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Old 01-20-2012, 02:42 PM   #17 (permalink)
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The flush grille block looks completely stock ( and in my opinion, even better than stock.)
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Old 01-20-2012, 02:47 PM   #18 (permalink)
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Thank-you for that. That's what I was hoping for! I took some inspiration from the Bluemotion and decided to just block the whole thing in gloss black.

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Old 01-21-2012, 06:33 AM   #19 (permalink)
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This may be the best looking grill block I've seen.
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Old 01-21-2012, 12:36 PM   #20 (permalink)
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Block sure looks cool. If you want to make it perfect you need to take about 10mm out from the cars left side piece to make them symmetrical .

Yes when you take out the rear muffler you wont even notice it while driving.

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