Topcase removal and backpressure? - BMW Luxury Touring Community
 
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post #1 of 6 Old Jan 9th, 2007, 1:17 pm Thread Starter
 
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Topcase removal and backpressure?

I'm wondering if removing the topcase helps to eliminate the backdraft (air pushing on the helmet from behind) one gets riding on highways with the windscreen in the full upright position?
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post #2 of 6 Old Jan 9th, 2007, 1:48 pm
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Quote:
Originally Posted by hoodoodrum
I'm wondering if removing the topcase helps to eliminate the backdraft (air pushing on the helmet from behind) one gets riding on highways with the windscreen in the full upright position?
Tim - it might help a leetle, butt won't eliminate it completely. That windshield provides the Bernoulli Effect pretty good, even with the underdraft slot at the base. However, removing the topcase did seem to lessen that neck backdraft for me, at speed. Give her a try and see whatcha think. Very easy to do.
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post #3 of 6 Old Jan 9th, 2007, 2:05 pm
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Quote:
Originally Posted by Dick
Tim - it might help a leetle, butt won't eliminate it completely. That windshield provides the Bernoulli Effect pretty good, even with the underdraft slot at the base. However, removing the topcase did seem to lessen that neck backdraft for me, at speed. Give her a try and see whatcha think. Very easy to do.
Dick's right. If you've ever run a Parabellum windshield with the ports, you'll see it's mostly windshield that creates the back pressure.



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post #4 of 6 Old Jan 9th, 2007, 2:20 pm Thread Starter
 
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Quote:
Originally Posted by grifscoots
Dick's right. If you've ever run a Parabellum windshield with the ports, you'll see it's mostly windshield that creates the back pressure.
Dick, I may try removing if a different screen doesn't help.
How different is that Parabellum from the stock? Grif.... do you have the ports?

Last edited by hoodoodrum; Jan 9th, 2007 at 3:04 pm.
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post #5 of 6 Old Jan 9th, 2007, 7:31 pm
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Well, he did for a while before he had a rainy day get off. His was a shortened unit with ports. I had full height with ports. I didn't have the back pressure issue with the ports open. The Parabellum sits up straight and doesn't lay back like the BMW or V-Stream. You can see what one looks like here, and then clink on the K1200LT link. The one shown in the picture does not show the ports.

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post #6 of 6 Old Jan 10th, 2007, 6:35 am
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Bugs on the back of the windshield

Guess that explains why I have to remove bugs from both sides.... I have noticed that the amount varies with the height of the windshield. Lower has less.

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