260DET Posted November 29, 2013 Share Posted November 29, 2013 I love Phillip Island even though I'm crap there, so friggin fast. Quote Link to comment Share on other sites More sharing options...
JMortensen Posted November 29, 2013 Share Posted November 29, 2013 (edited) With regards to the S flaps and the verticals on the splitter, seems like you can't really do both in the same spot. It would be possible to put the fences in a ways, maybe a foot or so from the edge to "capture" the air on the splitter, and then use the S flap to evacuate air from the engine compartment. I think it makes a lot more sense to use the S flap if you have a path for air to get out of the engine compartment as well. If you have a full fenderwell, you can only pull from under the frame rail. If that area is removed there is a better path for air to get out from under the car. FWIW I agree with Cary that the calcs on the Bimmer should have some value. I don't think it's "shoot blindly in the dark or pay for a wind tunnel session" and in fact, I question the usefulness of the wind tunnel sometimes. You can get a good idea of the overall effect, but if you have limited time in the tunnel you might make more than one change at a time and then you lose the capacity to figure out which change had what effect. This manometer testing gives the chance to test and test and test at comparatively low cost. I think cfd would be another really good way to go. Seems to make more sense to get things fairly well optimized with the cheap repeatable methods, then go in and fine tune the thing with the tunnel. Edited November 29, 2013 by JMortensen Quote Link to comment Share on other sites More sharing options...
tube80z Posted November 29, 2013 Share Posted November 29, 2013 Thanks for the pic. I was trying to figure out if I could get away with mounts like that in SCCA XP where the wing would be reverse swan neck mounted. The rules specify the wing location but don't really talk about the mounts at all. For those interested here's a thread about the aero development of the red Z we're talking about. http://www.viczcar.com/forum/index.php/topic,9059.0.html Cary Quote Link to comment Share on other sites More sharing options...
JMortensen Posted November 29, 2013 Share Posted November 29, 2013 Looks pretty serious. I have to wonder if there is a point at which front diffuser is too long. Quote Link to comment Share on other sites More sharing options...
LanceVance Posted November 30, 2013 Share Posted November 30, 2013 For those interested here's a thread about the aero development of the red Z we're talking about. http://www.viczcar.com/forum/index.php/topic,9059.0.html Thanks for the link, I've been planning a rear diffuser similar to this, and I'm glad to see one already in use on an S30. I'm thinking mine will extend out slightly more, and I'll notch the rear panel to allow it to come up a little higher as well; something like this, hanging off the rear bumper: Anyhow, considering this is a hood vent discussion, I'll redirect that way. I'm planning on cutting some holes in the hood for venting, and installing some almost flush louvers (I will rarely track the car, despite it's many 'race car' features, so I'm not opposed to making some successions for aesthetics). Has anyone here made custom louvers in this fashion? I've seen it more and more often in the OEMs, and despite their fascination with non-functional fashion vents in the 90's I'm inclined to think that they do serve their purpose. Here are a few examples to illustrate. Ford Raptor: Aston Martin V12 Vantage: I'm planning on something closer to the Aston's in terms of design and shape, but much simpler in construction. A basic riveted aluminum design, powder coated to match the exterior trim work. This is the closest thing I found on the web: I'm also planning a set of matching fender vents, situated right behind the ZG flares. My hopes are that the flare will act like the small spoiler before the vent that has been discussed earlier in this thread... Quote Link to comment Share on other sites More sharing options...
heavy85 Posted December 1, 2013 Share Posted December 1, 2013 For those interested here's a thread about the aero development of the red Z we're talking about. http://www.viczcar.com/forum/index.php/topic,9059.0.html Cary Checkout the front brake cooling scoops. Wonder how effective they are vs ducting from the front end? Quote Link to comment Share on other sites More sharing options...
260DET Posted December 1, 2013 Share Posted December 1, 2013 It has bigger brakes than standard, no problems that I know of. In my experience with big brakes all that is needed is to remove the backing plates, after all brakes are meant to run fairly hot and so too much cooling can reduce their efficiency. Quote Link to comment Share on other sites More sharing options...
heavy85 Posted December 4, 2013 Share Posted December 4, 2013 Test results at ~60 mph: I was a bit shocked at +0.75 " water I was equally shocked at -1" water Net 1.75" water of lift Looking back at pics I took at the Indy Grand Am race and came across this Porsche. Its used to vent air from some cooler ( oil?) but tells me maybe there is something to venting near the front of the hood to at least take advantage of low pressure on top to reduce lift? Quote Link to comment Share on other sites More sharing options...
260DET Posted December 4, 2013 Share Posted December 4, 2013 Might be a bit too far forward to be in the low pressure zone but I guess that has been looked at prior to deciding to locate a vent there? There will be some disturbed air behind the vent so that would tend to negate any lift tendency in that area. Quote Link to comment Share on other sites More sharing options...
ZT-R Posted December 21, 2013 Share Posted December 21, 2013 Where can i get luvers put in my hood? or you guys just welding on little louvered strips? Quote Link to comment Share on other sites More sharing options...
1 tuff z Posted December 21, 2013 Share Posted December 21, 2013 (edited) If you were local I'd introduce you to 'the louver guy' who punches the louvers in the inspection lids I have available, here and he could punch as many you'd like! Where can i get louvers put in my hood? or you guys just welding on little louvered strips? Edited December 21, 2013 by 1 tuff z Quote Link to comment Share on other sites More sharing options...
ZT-R Posted December 21, 2013 Share Posted December 21, 2013 I do have louvered lids already. Quote Link to comment Share on other sites More sharing options...
JMortensen Posted December 22, 2013 Share Posted December 22, 2013 There are lots of sources for louvers online. The alligator tooth style that they use in ALMS cars are usually pretty damn expensive though. Seems like this would be something that a 3D printer would be great for... Quote Link to comment Share on other sites More sharing options...
1 tuff z Posted December 22, 2013 Share Posted December 22, 2013 That i do remember but was saying that he could punch the same louvers in your hood if it was here. I do have louvered lids already. Quote Link to comment Share on other sites More sharing options...
ZT-R Posted July 5, 2015 Share Posted July 5, 2015 What do you guys think about this? I was thinking about putting a little lip around it like the last picture but not sure it will be needed or not... Quote Link to comment Share on other sites More sharing options...
AZGhost623 Posted July 5, 2015 Share Posted July 5, 2015 I saw that posted up on Ztrix.com's instagram the other day. Is John making that hood for you? It looks pretty aggressive, I like it. Quote Link to comment Share on other sites More sharing options...
ZT-R Posted July 5, 2015 Share Posted July 5, 2015 Yea. I prefer a stock hood, but just have to much motor for no vents. Quote Link to comment Share on other sites More sharing options...
1 tuff z Posted July 6, 2015 Share Posted July 6, 2015 I like it! Quote Link to comment Share on other sites More sharing options...
RB26powered74zcar Posted July 6, 2015 Share Posted July 6, 2015 I like it! Me to. I'm in the middle of the same type of problem solving with my extreme under hood temps. I have twice the turbo/ exhaust plumbing heat to extract out from under my hood... I wish I could go with the hood ZT-R is. It's going to look menacing... Quote Link to comment Share on other sites More sharing options...
ZT-R Posted July 7, 2015 Share Posted July 7, 2015 Im sure I'm going to have to do some cutting on it . Quote Link to comment Share on other sites More sharing options...
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