kats

And this is what G-nose performs. Please don't take it seriously my calculations are not accurate. The thesis shows from 140 km/h to 160 km/h, G-nose took 8.0 sec, Basic nose took 9.5 sec. When G-nose reached to 160 km/h, Basic nose was almost 200 ft behind. Does it make sense? Kats

Thanks Roo and Alan, The data which Roo showed is exciting for me, I even don't know how to calculate that. This is just A Wild Guess, however I would say Roo's calculation might be something close to "IF" the car had the G-nose. And other cases too, thank you for the calculations. As Alan said, we need to be specific for numbers and units. 150 ps is written in the manual. And the engine performance differs depends on the territory even if the tag says 150 ps. The front end is 15mm lower for Europe model (except Portugees ) will also make certain difference in Cd and Cl. Gearing too, etc etc. Now I am curious about looking back old days, when we were able to buy G-nose from a local Nissan dealership with listed price, would it be the most inexpensive way to get a car faster? Adding 10 mph top speed, 30% more acceleration performance would cost more than just put a G-nose? Fairlady 240Z-L was 1350000 yen, Fairlady 240ZG was 1500000 yen in Oct 1971. The difference is 150000 yen. Now in Japan, you will pay 1 million -2.5 million yen for a complete set of genuine G-nose. Kats

One more quiz, how fast is the G-nose? I always imagine what a great driving experience for Mr.K would be. Now owned by Mr. Kenny Ueda, his car would pass my car easily on the road. The thesis provided the data, acceleration of mid range speed. Please think the yellow car and my blue car have the same gears. Kats

Hi Roo and Carl, By the way, yes if we have a car serviced properly for drive train and suspension components, properly tightened bolts and nuts, assembled carefully just they required in the manual would certainly reduce the chance of the shake issue. The test drive in U.S. and Canada late 1969 the crew noticed the vibration around 80 MPH constant speed cruising. The decision of Tokyo office was anyway just keep making cars, with balancing tire. They knew what they had to do thoroughly by the report of the test crew but needed a year and half for production ready. Let's play Another Wild Guess- about the top speed of "RACER BROWN" 1972 : If the car had a G-nose (with a chin spoiler), what the top speed would have been? How much speed would have been increased from 152.134 mph? Fairlady -Z brochure says G-Nose will give you 5% more top speed, 30% more mid-range speed acceleration. In the brochure, top speed of Fairlady-240Z is 205 km/h. Fairlady-240ZG is 210 km/h. Fairlady-Z432 is 210 km/h too (I think we have to guess there was something behind). Basically, I think it is a Japanese way of thinking. Listing data (numbers and values) must be correct and proved in many ways. Better is acceptable, worse is unacceptable. So, usually those performance data have certain margin in there. Kats

Seems good for reducing pressure in the engine bay! Kats

Hi Carl, Thank you for the data, I have never seen it before. I visited the link provided here, I saw they tested various kinds of body configurations. I am curious about the car stayed on the floor, Nissan engineers set the actual car on the block which makes the car sit higher than sitting on the floor. We know this car, Salt Flats Racer 240Z. Most of people never knew (including me) the G-Nose can be attached with the Europe front spoiler like this car. I think this car has perfect aero dynamic package available from Nissan back in 70's Except one thing, an undercover. If this car had an undercover on that day, it could have much faster top speed on the plaque. Nissan engineers tested a G-nose with a front spoiler in the thesis I showed here. More surprising for me is the car did 152 MPH in 1972 without G-nose. Kats

Hi! SpeedRoo and Alan described it well, I didn't even think about the under cover does such a great job for reducing Drag and Lift. Takeuchi-san (Z432-R owner) used to say he put an undercover on his car but he took it off in a few days. He said it wasn't good for engine cooling. Takeuchi-san, he takes his car on the road no matter how far his friends live, how hard rain falls from the sky. But he normally doesn't need to push his car over 100 MPH. Last time I visited him I saw the cover on his wall like an interior decoration. Me, maybe the same. I want to put it in my car but don't want to make the engine hot in the daily driving. Or winter only will work for me. Kats

Thanks Roo, I have seen the magazine but haven't read through whole pages, thanks! You don't need my drawings but hey, I put it just for fun. I have one interesting story to tell which Mr. Miyazaki told me about "front chin spoiler" later on here. Kats

Thanks Alan, According to the comments of Mr. Uemura and other engineers and styling designers, the 1/4 scale model was tested in the facility of the University of Tokyo. According to the book "Prince/Nissan" Kazuo Higaki (Nigensha), as Alan said Prince used to have a wind tunnel at Ogikubo but it had been abandoned since the end of the world war two, impossible to operate. Just like Nissan, Prince engineers brought their 1/5 scale model to the same place, the University of Tokyo. By the way, 1/5 scale is a tradition of the Prince which used to be as an airplane manufacturer. Nissan's used 1/4 scale... A full scale prototype car was tested in the wind tunnel freshly built at Nissan Oppama Chuo- kenkyujyo (Nissan Central Research Institute) at Dec 1968, started operating from April 1969. Kats Attached picture is testing a Prince R380.

Hi Roo, Me neither, and also engineers were shocked when they saw the results of Cd and Cl at that time. I will upload the remaining pages. Before that I will try to explain that Mr. Miyazaki told me about how bad the opening front end of S30 was. Just like you proposed, it was the issue of S30 which engineers had to deal with. I will draw a picture by hand, Mr. Miyazaki said S30 front end is so wide that it leads too much air coming through the radiator. Then the air can't go through under the engine because the air was blocked by the air stream which is flowing underneath of the car. At the end, the pressure of inside of the engine bay becomes positive, it pushes the front end. The higher front end gets more Cd worse. This story I think it relates the story of 15mm lower front end of Europe model (except Portugal model). And Mr. Miyazaki even told me there was a test car which had a factory air conditioning coupled with Z432!! (Z432 was not able to make a choice of air conditioning from the factory). During the test of aerodynamics, one day he was wondering why one car had a better value than other cars. The better one had an air conditioner condenser in front of the radiator. Less air gave less lift. That was a Z432. Kats

Alan, Your explanations made me realize the real meaning of Blunt. Yes the change to "Grand-Nose" is better, even people in the sales department were not fully educated why "Blunt" is literally not suitable for the image of the extension pieces. I think of course Mr. Yoshiyuki and Mr. Uemura knew how NASA's Blunt nose looked like and meaning of "Blunt", they might just wanted to barrow the image of detachable nose piece, not barrowing the meaning of "Blunt". By the way, "Blant" is just a spelling mistake? Kats

Hi Alan, I reviewed it once again to see how it was connected to the University of Tokyo's department of Aerodynamics and Aeronautics. I don't see it as we expected at the moment. I believe before 1969, the University of Tokyo was the only place where had a wind tunnel, but it was for 1/4 models not for full size scale car. So early days of styling development and aerodynamics study, engineers brought their 1/4 scale models to the wind tunnel at the University of Tokyo. In 1969 Nissan built a full size scale wind tunnel at Nissan Oppama. This thesis was made by using the wind tunnel at Nissan Oppama. Some of the engineers graduated the University of Tokyo's department of Aerodynamics and Aeronautics, so we can say the thesis was connected to it, though. Kats

Hi, For someone who is interested in aerodynamics of our S30 cars, here is a thesis made by Nissan engineers in May 21st 1971. Aerodynamic Study on Passenger Car Body Configurations / Michio TAKEI, Hikota SAKAMOTO, Kazuhiko YOSHIYUKI. The effects of G-nose and spoilers are quite noticeable, 7 pages of this thesis is worth to read. I'm not an engineer so some of the numerical formulas are unable to understand but the figures and illustrates work easy for me. So, I tried to show one of their data. Those numbers in pictures are excerption from the thesis. The only thing which I am not for sure is the data of Clr for the rear spoiler only configuration. It shows 0.007, it is too small isn't it? By the way, Mr. Uemura told the story of naming our G-nose in his book. "Blunt-Nose", Mr. Yoshiyuki and Mr. Uemura felt it was a cool name of NASA's Blunt-Nose cone which was attached on top of the satellite. They named their nose extension kit after the NASA's Blunt -Nose but the Sales department worried about that people would not understand what it would be. Finally "Grand- Nose" was used. Kats

Hi Patcon, maybe in Tampa with your car next year? That will be great! Kats

No, we appreciate your knowledge! Kats

Hi, I had a blast!! I am so glad that we got to see each other all at once. Alan, we talked about you a lot. Kats

The spoiler will be correct for your 12/70 car I think. In Japan, the spoiler was an optional item for any car listed in the brochure. Some other destinations had it as an optional item too. Kats

Hi SpeedRoo, thanks too! This picture is my favorite, and fascinating! Thanks Chris (26th-Z) for sharing it with us that was more than a decade ago. Let’s hope we will find more interesting stories and pictures. Kats

Thanks for the link, I am impressed by your wonderful collection of goodies, they are rare, I have never seen them before. And about the attitude of Nissan, not to disclose details about our car. Yes actually I was talking about it with Mr.Miyazaki. Mr.Miyazaki agreed with me, I told him how much we want to know about our car’s birthday and what ship loaded our car to the port. I am still dreaming about to find the record of our car’s history in Japan. Kats

This week I met two very important people for us. Mr.Miyazaki, a former member of vehicle test group for Europe and also did aero dynamics analysis for S30. And Mr. Uemura, a former member of Kaku - U team (test drive in US & Canada) and also he designed general layout of S30 chassis and suspension components. The picture is Mr. Miyazaki, he told me a lot of new things which we have never heard of before. One of them is, each our S30 can be tracked down by chassis number to see when it was made. Not only that, it can be tracked down by chassis number to see it was made in daylight time zone or midnight time zone. This story is like this, Mr.Miyazaki said to me, “ one day I visited Nissan Shatai around 2:00 a.m. midnight to see how workers were doing at the assembly line. Nissan got complaints from customers about insufficient looking of rear deck vinyl trim. It was not only a single complaint, one after another. AND ALL OF THEM WERE CARS MADE AT MIDNIGHT. I was surprised, a quite young girl was working and crawling and sitting in a rear deck to sticking the vinyl trims. She was an only worker who did the job at the assembly line. I felt sorry for her, I couldn’t say harsh words to her”. Then I asked Mr.Miyazaki how did you know it was happened at midnight, Mr.Miyazaki said “Nissan Shatai has the data, each car can be tracked down by the chassis number. In this case, interior trim section had three or four time zone, each time zone they recorded chassis number they worked” Can we see when our cars were served at the assembly line? Mr.Miyazaki said “they might still have the record, I think” I hope it too! Kats

Thanks Alan, so you pulled it out from the works rally car, what a wonderful thing you have got! The small label shows February 1971, must be corresponding to the car’s manufacture date. I need to put the label on to my oil coolers! Kats

Hi! I don’t know when. I want to know it too. Maybe somewhere in between from late 1970 to late 1971. Kats

Thanks Patcon and Alan, I didn’t know that, there was a paint manufacturer from Germany for our cars. And the paint samples! They must be so good, because it is German quality. Kats

I have been looking for original color for my blue 240Z, color “Universal Blue 903”. I finally got to know the manufacturer DAI NIPPON TORYO (DNT) and they made a sample for me for free of charge. We know Nissan used TANABE KAGAKU for the metallic paint, and there are mixing ratio of colors, this information can be seen only in Fairlady Z service manual. I have never came up to see those instructions in any other manuals. That means there is no information for Universal Blue 903 because it wasn’t available for Fairlady Z series. And seemed no Nissan domestic cars were sold in blue 903.(maybe I might be wrong). But I tried to ask a local paint shop which is very helpful for me and they found TANABE KAGAKU was merged into DNT. DNT replied they still have data of Nissan metallic 903 and 901 which they were originally provided by TANABE KAGAKU. Unfortunately, today’s paint isn’t the same like 1969 acrylic enamel paint. But I am happy that I think the paint has DNA of original 903/901. Please see the samples, I think it looks little bit lighter than my original 903 around the spare tire area, I have to decide to go with 903 or put a little bit arrange with this 903. Also, I really love 901 silver. I realized that my Z432 has much brighter silver, so back to 901 will be on my to-do list too. Kats