I am not sure where this thread is heading too, but I think you guys are just a bunch of spitfires. Just keep it down to facts and data.
I am in the market for some louvers and I already bought an extra bonnet so I keep my pristine original one original. I have a '99 NB btw, so I want NB louvers. The car is mostly a street car so I would like to maintain my original bonnet hook so keeping the standard bonnet bracing is relevant to my interests. Shane seems to be very capable to draw up some louvers and produce them. They also keep clear of the bracing. So far so good. Now the all the discussion about pressures, engine bay temperatures, aluminium vs. iron etc. does not interest me. The bulk of the heat (I guess around 90% or even more?) of the engine is transfered to the air through the heat exchangers in the front of the car. These heat exchangers work because air flows through them. The thing these louvers should accomplish is to allow for more air flow through the heat exchangers. Air flow through the heat exchangers is all we care about. Now of course checking pressure maps is a very good start to determine the best place for these louvres, but I am interested to see actual air flow measurements with these louvres in place, because I think these louvres have some influence on the pressures around the front/hood area. Anyone with experience in aerodynamics is free to comment on this as I am no expert! I think everybody here should be intelligent enough to make their mind up based on facts. Do not feed the trolls. I do not care if my louvres get made by Ryan or Shane. The most important thing to me is airflow through the heat exchangers and data to back up the claims. Seeing these louvres installed on multiple vehicles with good succes is important to me. Secondary things are: looks, easy installation, (shipping) price, and being able to retain the standard bracing. Whoever does that best gets my money, be it Shane or Ryan. Just my :2cents: |
Originally Posted by mx5autoxer
(Post 1153730)
So how different is the pressure map of the NB vs. NA? And what's the resolution on those maps (like 10 or 15 measurements?)
Most interesting was our testing of several of the existing common vent options, some worked pretty well and some didn't. As an aside, another thing that really surprised me was the effect on the pressure differential across the radiator from clean air ahead vs. a car 50 ft. in the distance (at 65 mph). I wouldn't have expected a big change from a car leading that far away. Oh, I've also made a few tweaks after string testing the hood's airflow as well. This isn't the only part in the works, so I've had my hands full. I'm taking the weekend off and going on a motorcycle ride :) Developments coming this week though. I'm working out the details on a part of this that I'm rather excited about, but still working out whether it is cost-effective. -Ryan |
Yaaayyayyay. Take my money
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Have you considered making two different versions? An m.net version that doesn't require cutting the stock bracing, and an mt.net version that does require bracing removal but is 100% optimized based on pressure data. I'm not at all interested in the proposed m.net version, but will send payment right now for a fully optimized version.
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jpreston, standy by :) I believe I have figured out both. In terms of my priorities on this, performance/effectiveness trumps avoiding the bracing.
I'm just keeping in mind that a lot of guys would like to retain enough bracing that the hood doesn't become a floppy mess ;) -Ryan |
Will we experience any hood lift at high speeds?
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I would think the opposite would happen...less hood lift
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Well I was curious to his last post about it becoming a floppy mess. What type of bracing was he suggesting?
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Originally Posted by BlackBandit
(Post 1154044)
Will we experience any hood lift at high speeds?
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Would it make sense to create a bracing that would be sold with the louver? I thought of a bracing that would surround the diameter of each louver underneath for more stability. I would pay more.
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IMO the only real problems with taking the bracing out on street cars are; loosing the stock hood latch, and loosing the little hole that the hood prop goes in. You can easily avoid the bracing for the hood latch.
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Thank you for answering this. I will more likely make cuts for a street use and hope that it will be efficient enough for a track day or three in a years time.
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I did the De-Bone hood. removing all the hood bracing.. hood was a sloppy mess event with aero catches.
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Originally Posted by OGRacing
(Post 1154103)
I did the De-Bone hood. removing all the hood bracing.. hood was a sloppy mess event with aero catches.
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Originally Posted by Leafy
(Post 1154131)
You definitely want to leave the bracing along the sides. But taking the stuff out of the middle isnt bad when the hood is down and secure.
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I installed the GT500 vent in Sean's car ^
The final design of these louvers are looking like they'll require removing less underhood bracing than needed to be removed for the GT500 - the hood should be fine for keeping the stock latch as the fastening point or hood pins. Just to clarify for those reading along, Leafy, OG, etc. who are talking about hoods that get all flippy-floppy are referring to hoods with damn near no bracing left at all - for weight savings, not to clear hood vents. -Ryan |
Originally Posted by Leafy
(Post 1154131)
You definitely want to leave the bracing along the sides. But taking the stuff out of the middle isnt bad when the hood is down and secure.
Originally Posted by ThePass
(Post 1154165)
Just to clarify for those reading along, Leafy, OG, etc. who are talking about hoods that get all flippy-floppy are referring to hoods with damn near no bracing left at all - for weight savings, not to clear hood vents. -Ryan |
My current hood (still without vents) has all of the stock bracing removed except for the outside perimeter and what's required for the hood latch. I'm only using the factory latch and attachment points and don't have any complaints.
Originally Posted by ThePass
(Post 1154011)
jpreston, standy by :) I believe I have figured out both. In terms of my priorities on this, performance/effectiveness trumps avoiding the bracing.
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Any chances a few batches will be pushing through earlier Ryan? Namely for the nb hood.
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Of course I just purchased myself a spiffy CF Mini piece to ventilate my spare hood with ... now you come along with your so-called "testing" and "data" (honestly, really, WHO DOES THAT ANYMORE? It's the age of CAD and cheap China manufacturing - while I typed this post, I created and sent off my new 3d UltraMiata wing design to manufacturing, and expect the first container tomorrow via drone) to show me where I should ventilate it for best effect, which undoubtedly will not be where the Mini piece will look best.
So gitrdun, my funds are waiting. |
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