BRAAP

That sounds Sah-weeet! I was talking more on the odd tractor sound I have heard from some 5 cylinder ratty Audi's on the street with and open exhaust Vipers!

Agreed. Fighter jet aerodynamics have no relevance in this discussion due to the fact their design takes into account flight beyond the speed of sound, (cars just don’t go there), as such the design criteria of the shape and exterior of the air craft changes, and changes drastically with sharp points to “control” and “aim” the shock waves that are produced during trans and super sonic flight. In short, you are correct that the tear drop does not apply to fighter jets, but you are also incorrect in calling the tear drop shape irrelevant as applied to the discussion of this thread, cars traveling sub sonic. The exhaust of the fighter controlling air flow behind the aircraft, in a scenario that could be related to this discussion, only happens on such aircraft that the tail or extreme eppenage of the aircraft IS the exhaust, such as the Mig 15/17/21, F86/100 Sabre/Super Sabre, F-16, etc, or some custom Honduh's we see driving down the road, using huge by large exhaust tips mimicking the fighter jets allowing the air flow of 63 HP from a single 5” diameter exhaust tip, (or twin 12" in this picture), to reduce the turbulence found aft of the vehicle… Courtesy of urbandictionary.com The show is definitely fun to watch and I also would've like to see them take their testing much much further with the resources they had available.

Taking the Myth busters project to the next level, and has been mentioned already in this thread regarding vortex generators, if the dimpling was applied only to the location just ahead of where the boundary layer starts to separate on the car, (roof line ahead of the rear window and back of the trunk, just like that funky Corbin Sparrow pictured above), in an effort to retain that boundary layer across the transition of the body shape for as long as possible, reducing the quantity of turbulent air flow/drag, leaving the rest of the car, smooth, should realize an even greater increase in MPG from reduced drag. Those dimples across the front, roof, and hood of the car in the Myth busters testing, (where the boundary layer of air was intact and in no need of surface mods to maintain boundary layer flow), does not need the dimpling, as such the dimples themselves in those regions are inducing a slight amount of drag. As Cary mentioned above, Vortex generators are performing the same job, using different technology and being applied only the region where separation takes place. Remember, nothing is free. This technology doesn’t 100% fix the issue, just prolongs the separation to further across the surface at the expense of drag. If we could get the boundary layer to remain intact similarly with out the dimples or vortex generators, drag would be further reduced again! Turbulence; Courtesy of AirCraftSpruce.com Here are some Vortex generators pics to help illustrate what is taking place; Courtesy of aerospaceweb.org Courtesy of microaero.com Courtesy of automotive.com

I agree 100%, as you stated, only if the car could be optimally shaped, i.e. tear drop. Due to packaging and safety constraints of production car design, the optimum shape of a tear-drop/air foil with the sharp tail is going to be tough. Due to the blunt or rounded-blunt rear end of production cars, (as compared to the sharp point of the tail of a tear drop), turbulence, i.e. drag induced from the loss of boundary layer, therefore separation of air flow across the surface and the result of drag, even as depicted on the modern, relatively speaking aero Ford 4 door. That is where the dimpling comes in to play. I’ll elaborate in the next post.

Nice Knob Rob..

:lmao:

Yes... yes it is..

Been a long day, how's this?...

Built another tool yesterday. An extended mandrel for my Snap-On damper installer, (pt# YA 188C) so it will work for the LSx. Took a new LSx damper bolt, turned down the head of the bolt on the lathe and threaded it to fit the damper installer.

Yes. LOVE that car, (the Alpha car as he calls it), studied literally hundreds of pictures of that car during the LSx conversion, on track pics, and the various upgrades as the car evolved to what it is today. I was bit surprised when Terry announced he was going to sell the car a couple months back, I’m sure his next project will be no less stunning. This picture of that same car is my desktop pic.

Which 300-ZX? Z-31 or Z-32?

Thank you so very much guys. Had a wonderful birthday. My 3 lovely daughters, ages 17, 15, and 4.5 made a nice Lasagna dinner, Brownies instead of cake and little house decorating. My lovely wife of going on 21 years, came home from work early, had a nice relaxing evening with family. Yes, I am 42! Ron was getting me back over his birthday last month. He turned 39 and I was successful in getting more than few people, including my family, to wish him happy 40th Birthday! Best part was the look on their faces when he told them he wasn't 40! LOVE the V-8 ITB pic, thanks Dave.

It resets automatically, sorry about that. Let myself, RTz, or Phlem know and we'll change it for ya.

Sharing other phone based OBD-II scanner/diagnostic tools and the like per the topic of this thread is encouraged, similar to the laptop/palm example you shared above. But this; ... This post screams of iPhone cynicism. If your post is not just a jaded "iPhone sucks" post, then please show us these "Windows" phones and the several orders of magnitude of apps available for them? Otherwise, that sort of comment helps no one and should not be posted. By the way, the majority of iPhone apps are written by guys in the basement, the code is no secret. http://developer.apple.com/iphone/program/ http://www.iphonewebdev.com/ http://blog.ablepear.com/2009/10/building-iphone-apps-with-html-css-and.html http://www.softwaredeveloper.com/features/iphone-development-web-2-080307/ For the record, I am on my second iPhone, wife is still on her first, it is definitely a love hate relationship for sure. Great toy, some very cool innovative useful apps, lousy phone! That's my personal opinion. Looking forward to the release of Innovates OT-2.

I'm glad to see someone taking that info constructively and wrapping their mind around it. A couple of things as this applies to the inline 6. The Datsun L-6 headers, (6-into-1, or 6-into-2, or 6-into-2-into-1 design), already has its exhaust pulses merging at even intervals, giving the L6 exhaust note its smooth crisp tone. For a 6 into 3 header design, (whether it is 6-into-3 with triple exhaust pipes or 6-into-3-into-1 single exhaust pipe), your pairing of cylinders is correct in pairing the opposite firing cylinders, 1-6, 2-5 and 3-4. But I don't think it will change the tone of the exhaust note any from the standard 6 into 1, or 6 into 2, or 6 into 2 into 1 designs. I short, so it wont make it any smoother or crisper sounding. Though having 3 exhaust pipes would be rather unique and exotic looking. If for nothing else other than begin different, triple exhaust could be tastefully ran out the back. Would definitely get a bit of attention at the car shows. Though if you merged cylinders that fire in odd patterns, (such as pairing 1-2 or 1-3 or 1-5) you would get an odd rough tone like a V-8, Suby 4 cylinder or maybe the Audi 5 cylinder/Dodge V-10, depending on when you merged, which cylinders. (I personally don't like the sound of free flowing exhaust systems on Audi 5 cylinder or Dodge V10! Sound too much like a really old odd ball tractor, not a sports car or even a muscle car!). From an exhaust scavenging perspective, it wouldn't be ideal, but just as the Subies and domestic V-8's with their odd paired exhaust pulses, the merging of odd firing pulses isn't going to "hurt" performance to level you would notice.

:lmao: