What have you done to/with your Boss 302 this week?
#144
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Well thanks for the compliments. I am anxious to test it on the track. Drew had a good suggestion trying back to back sessions one taping off the openings and one without the tape on the same day under the same ambient conditions to see if ECT tracks or shows an improvement.
#145
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Gary, I think you could get even better flow out of those holes if you could open them up a bit more, and especially if you chamfer the leading edges. A Unibit would be the perfect way to do this.
#146
Originally Posted by cloud9
Ok the new wing is on It is so much more massive (but not heavy) than the stock one, and I'm excited about the potential aero benefits at the track. I know there's been some discussion about using the GT500 spoiler as well, so I took some side by side shots comparing the two:
#148
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I'm certainly no expert in airflow, but does the chamfering reduce drag/increase flow through the hole? It seems it would funnel in more air than can pass through the hole. Again, total newbie on those concepts. Thanks.
#149
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A countersink bit might work as well. The one I have doesn't have a long drill bit on it like the ones in the link. I purchased it at Lowe's.
http://www.google.com/search?q=count...w=1280&bih=822
http://www.google.com/search?q=count...w=1280&bih=822
#150
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Manually. One trick people sometimes use is to wrap the drill bit with tape, and drill until the tape is about to touch the surface of the part. Taping a Unibit is a bit more effort though.
It is obviously hard to know that for sure. I am not suggesting that you take a much larger bit to enlarge the holes, this one has an intermediate size. The chamfer for the next larger size can be used to make the chamfer for the holes. The size of the chamfer for the bit in the first picture is too small for this though. The one in the second pic would be better, however it doesn't have the intermediate size that you would want.
Because they only have one flute, Unibits are GREAT for making very clean and round holes.
This article will explain a bit of why the sharp corner reduces flow. This is particularly important in this case because the holes are so small. The effective area is reduced by quite a margin. Carefully blending the leading edge of the hole can do a lot to minimize this effect.
This is why all properly designed velocity stacks have a trumpet-like shape to them. The ideal edge shape is a smooth radius, but unless you have a nice router bit handy, chamfering with a drill bit will have to do.
Because they only have one flute, Unibits are GREAT for making very clean and round holes.
This is why all properly designed velocity stacks have a trumpet-like shape to them. The ideal edge shape is a smooth radius, but unless you have a nice router bit handy, chamfering with a drill bit will have to do.
Last edited by PTRocks; 6/29/11 at 09:57 AM.
#151
Good info guys, but we're not talking about an f22 here. The extra effort to chamfer or expand the holes likely won't have any measurable effect vs.what's already been done.
#152
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I was just out at a job site checking on an installation and one of my guys told me that's what they do when countersinking into furniture. He said you do have to watch out because the tape will move on the bit.
#157
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Ok the new wing is on It is so much more massive (but not heavy) than the stock one, and I'm excited about the potential aero benefits at the track. I know there's been some discussion about using the GT500 spoiler as well, so I took some side by side shots comparing the two:
Dave
#158
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Plus yes IMO it looks much better. So.....for $268 + paint if that's all I get I'm still a happy camper.
#159
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The additional downforce should be good for at least 1 MPH. I doubt any of us will be driving our Boss cars to their full potential but we might as well look good trying.
#160
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Results should be greater with a splitter/wing combo. A wing in itself will tend to add understeer (push). Whether Gary's stock spring/bar/shock Boss could use a little high speed understeer remains to be seen (or seat of the pants measured).
Nevertheless, it still looks sweet!
Dave
Last edited by iDrive; 6/29/11 at 02:39 PM.