I currently do not have tooling to build the frame itself let alone the space. The original idea for this was just to design the car something like a FSAE but wider that can accommodate two people, while I do want to win races I know that it is almost impossible to get a carrier of being a racing driver. As such I just want to build a fun car that will have a good competitive edge, I'm not looking to build a insanely fast car that breaks all kinds of records, but I've always figured if your going to build something build it to the max and then tune it down and progressive tune it faster as your skills start to exceed the capabilities of the car. I don't want to build a car and then through some off chance miracle be stuck wishing the car was quicker in this aspect or wishing it had a different engine or something else, there are ways to knock the speed off of an engine. I will admit I haven't really read into the class ruling all that much since I've been mostly concerned with learning more about the front suspension geometry. Which is what I'm mostly on this forum for. This hasn't moved passed pencil and paper/CAD drawing yet and since I do wish to build a car I kind of want to learn about all the different aspects that are go into building a car like this, I'm hoping that once I finish my schooling I can get a job working on these types of cars or other automotive engineering areas and work my way to race engineering.
The idea here isn't to just hurry up and pound out a drawing and sell my Focus and start throwing materials and parts together to see what comes out, its to learn about the design process, design the car, get a price listing together and have fun with it. I don't see myself building the actual car for a few years. All the while I will be getting more seat time in my Focus on the hills. I do appreciate all the questions you have asked about what I'm really looking to build, and the truth is a competitive car that isn't comfortable to drive as a street legal car, (and street legality as stated in my first post isn't even a primary concern its a secondary) I want a race car first and a street car second. From different sources I have read you start designing a car from the outside in starting with the front suspension geometry, while I'm working on that portion of the project I will be researching through the PHA rules to find out about classing regulations, safety regulations and car regulations. And cost is never an issue, its just time, and since I'm not looking into spitting out a full car tomorrow I'm not worried about cost saving money is the name of the game and spending it on quality parts once the design is finalized and I have access to tools and space to build it the consideration of even building it starts.
Again I've decided to go with a 15" wheel and a 225/45R15 tire since they seem to be cheaper and easier to find and the the Rota Slipstreams I have on my Focus at 16" respond well with the Hankook Ventus 225/45ZR16 C71 compound tires I have on them, They grip substantially well. To pair with those 225/45R15 tires I would like to know what for hubs I could use, Miata V8 suggested finding a FWD donor car and using those spindle assembles with the axles removed. I'm still curious as to why you suggest a FWD Spindle assembly as I'm still looking at popular cars with a rwd assembly and trying to narrow those down to the cars with double wishbone front setups and rear steer spindles. I stumbled into another website of a guy building a "cheaper" DSR/CSR style car where he used Miata hubs, Now my issue again is that when I try to get the roll center to be around an inch or two above or below the ground level at the center of the car my a-arms just don't look right to me. See this picture here of my attempt of locating the roll center at an inch above ground level using the measurements of the Fiero/Chevette spindles on the 225/45R15 tires.
I know I have to be doing something wrong with figuring out the geometry, I see a lot pictures of DSR/CSR cars and it looks like quite a few people are making their own spindle assemblies to fit what they want. All I'm really looking for is about 2 inches of ground clearance on the bottom of the car to road surface, now its going to make for some pretty stiff suspension and alot of scraping the ground I know but I want to keep a low profile with the car I don't know the first thing about making a body for this type of car so I will have to assume that the aero characteristics of my car would not be greatly beneficial. Also the wish to set the RC one inch above the ground is solely based upon another thread I read where it appeared people where suggested to keep the RC 1 to 2 inches above or below ground level, again please correct me if this is ill thinking.
Thank you all again for the help and I'm sorry I did not clarify that this is more of a learning project then actual going out and building it in a few months with a solid plan from scratch. I did not intend for everyone to assume that I was building the car asap like I said earlier I want to learn the process behind designing and engineering a DSR/CSR car, and obviously if you want to race a car you design to win.