Advice/directions for Arch Louvre grills? - Page 2 - LotusTalk - The Lotus Cars Community
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post #21 of 52 (permalink) Old 09-02-2014, 07:47 PM
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I like the reverie,
But 1,200 is nuts


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post #22 of 52 (permalink) Old 09-02-2014, 08:48 PM
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Someone should offer them at half the price


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post #23 of 52 (permalink) Old 09-02-2014, 09:22 PM
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This was done 2 owners ago. I think it was copied from a clam design that a Japanese tuning company used to make. I don't remember the name.

I ran without fender liners for a bit, and on wet days I could notice the dirty water from the ground was being pulled out the vents and splattering down the side windows. Unfortunately that's about all the data I have, because the mess was so annoying with Seattle weather that I reinstalled the liners. I did vent the liners in a way that air "should" still flow through, but it's no longer a direct path and I no longer have muddy windows.
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post #24 of 52 (permalink) Old 09-02-2014, 09:24 PM
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In your photo, the inside edges of the openings are too close to the flat part of the "hood". That is a high pressure area. I like how this one is installed...



My guess, these are Reverie's...
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post #25 of 52 (permalink) Old 09-02-2014, 09:27 PM
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post #26 of 52 (permalink) Old 09-02-2014, 09:35 PM
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In your photo, the inside edges of the openings are too close to the flat part of the "hood". That is a high pressure area. I like how this one is installed...

My guess, these are Reverie's...
Those look more like the vents on the Red Bull car posted above. The Reveries stick up noticeably (see the link I posted above) and are fugly in my opinion. I much prefer those in the photo you posted and the Red Bull photo(s) as they look flush.

San
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post #27 of 52 (permalink) Old 09-02-2014, 09:35 PM
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Here is a Tesla CFD of the velocities...



It appears that you would want you fender vents in the blue areas... behind the front wheels and behind the radiator opening in front of the windshield...not where these are put. A louver like Reverie makes would draw the air out, but openings like you are suggesting would only draw air into the wheel well.

Sure this is a Tesla, but very close to an Elise.
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post #28 of 52 (permalink) Old 09-02-2014, 09:36 PM
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I thought there might be something to be learned here.

Sugeray, are you doing this based on speculation? How fast do you get to on the track?

05 elise (BOE Rev300 supercharged, SSRs, shift tower mods, Multivex; HID hi/low beams); 05 Corolla XRS. Past '72 Elan Sprint (I restored), Lotus 7 w/X-flow, TT Supra, Bugeye Sprite, BMW 2002 & 2002tii, '65 GTO.

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post #29 of 52 (permalink) Old 09-02-2014, 10:18 PM
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Here is a Tesla CFD of the velocities...



It appears that you would want you fender vents in the blue areas... behind the front wheels and behind the radiator opening in front of the windshield...not where these are put. A louver like Reverie makes would draw the air out, but openings like you are suggesting would only draw air into the wheel well.

Sure this is a Tesla, but very close to an Elise.
Based on that I would think the Exige style vent behind the wheel well on the lower mini-panel in front of the door would be optimal for the front, especially seeing the minimal effort to do it to an Elise. No need to hack up the front clam.

For the rear maybe something similar to this would be easier as well.
http://www.speedhunters.com/wp-conte...349_g3iz_0.jpg

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post #30 of 52 (permalink) Old 09-03-2014, 01:02 AM
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Based on that I would think the Exige style vent behind the wheel well on the lower mini-panel in front of the door would be optimal for the front, especially seeing the minimal effort to do it to an Elise. No need to hack up the front clam.

For the rear maybe something similar to this would be easier as well.
http://www.speedhunters.com/wp-conte...349_g3iz_0.jpg

San
I concur... the top of the fenders just has too much positive airflow for louvers. Exige lower fenders look like they would do the trick...and look OEM at the same time!
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post #31 of 52 (permalink) Old 09-03-2014, 04:17 AM
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post #32 of 52 (permalink) Old 09-03-2014, 06:06 AM
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Here is a Tesla CFD of the velocities...



It appears that you would want you fender vents in the blue areas... behind the front wheels and behind the radiator opening in front of the windshield...
I would not use that CFD data to determine vent placement. It's a velocity profile, not a pressure profile. The blue, low speed area at the base of the windshield is likely a sign of a high pressure zone.

The blue behind the front wheel is more interesting. It may be a good location for a vent, but the pressure profile would be needed to confirm.

The velocity profile appears helpful in determining some likely areas of high turbulence/drag. The side mirrors and the exposed section of the front tire are causing large gradients in air velocity.
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post #33 of 52 (permalink) Old 09-03-2014, 06:59 AM
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I was also wondering if the CFD data for the Tesla should even be considered since the car has fairly substantial body contour differences. You have to admit the Eliges are more curvaceous than the Rodster.

'05 CO Elise Mods: Yes
'01 NFR S2000 Mods: No
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post #34 of 52 (permalink) Old 09-03-2014, 08:34 AM Thread Starter
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I agree, especially since the Tesla doesn't have any front radiator vents, it throws everything off!
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post #35 of 52 (permalink) Old 09-03-2014, 08:45 AM
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Look at Elise and Exige track cars. Do you see any vents in the tops of the clams? I don't.

San
I think this may have something to do with modification/features that are allowed in each race class.

Jason

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post #36 of 52 (permalink) Old 09-04-2014, 01:44 AM
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You might find this of interest .... forums.seloc.org/viewthread.php?tid=375219&page=3

Sorry .. Can't get link to work ... Cut and paste

Last edited by cph; 09-04-2014 at 01:50 AM.
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post #37 of 52 (permalink) Old 09-04-2014, 06:30 PM Thread Starter
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[QUOTE=cph;3462993]You might find this of interest .... forums.seloc.org/viewthread.php?tid=375219&page=3

I appreciate the thought, but since they didn't post any pictures of the vents it didn't really help. I guess I am looking for a template to use when cutting, and will pay good money for it!
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post #38 of 52 (permalink) Old 09-05-2014, 12:26 AM
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If you do find template I would be keen to recieve also .
Looking to vent both front and rear in my track only Elise .
That been said it should be easy enough to make a template with cardboard and transfer to clam .
Using a Dremel cutter and sander tools to shape accurately .
Fill / sand / paint ... Job done
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post #39 of 52 (permalink) Old 09-05-2014, 06:04 AM
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I have a factory wide body gt3 clam set. It has the louvers in the front clam behind the front wheels I could take some measurements for anyone who interested.
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post #40 of 52 (permalink) Old 09-05-2014, 06:22 AM Thread Starter
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That sounds great! I find it very interesting that the vents are behind the front wheels whereas the Reverie are directly on top of the wheels. I trust the factory GT3 clam is the best design of all! Please specify your measurements from the corner of the clam below the windshield so we are all on the same page. Thank you!
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