Tweet
Miata for sale
I wrecked this car unfortunately and they totalled it and I bought it back. It runs great and needs a bit of bodywork/replace some panels and door but could make a great trailer queen as is or a rebuild. I was going to keep but don't have the time to get it rebuilt and race it. Low miles. Below are specs. I'll be posting this here for a week before I post on FB and Craigs.
- 2006 Miata Grand Touring
- 69k miles
- Single aftermarket exhaust I believe its a roadstersport street.
- Stock strut bar
- Two sets of tires
- Stock rims with tires plenty of tread
- TRM C3 17X9 on Hankook RSV-V2
- 6 Speed Transmission
- Limited slip diff
- Cloth Top in great condition
- Leather seats
- Stereo with Bluetooth
- Driver seat lowered 2”
- Coilover suspension see below for details
Extra parts
- Open Diff
- Stock rims with tires plenty of tread
Here is what the original owner did for suspension.
The coilovers were built by me. I am a mechanical engineer and a bit of a suspension geek and that has been my project for about 6 month. They started as Bilstein Sports which I converted to take-aparts. Basically depressurizing and then brazing in nitrogen fill ports and refinishing them. Also had new snap ring grooves machined in the bodies lower so that the coilover sleeves would fit properly. Coilover sleeves fit over the bodies for height adjustability. The spring rates chosen were based off of ride frequency analysis and are 450lbs/in front and 400lbs/in rear. This set up works incredibly well with a front sway bar and no rear and you will find many top drivers running similar rates, Goodwin included. It also happens to ride pretty well due to the "flat ride" concept. The springs specifically are Hyperco brand which is considered to be the best in the industry. The fronts are 8" free length and the rears are 7" free length with zero rate tender springs to keep everything tight. The rear has custom 3d-printed mounts to locate the springs since the stock springs are a much larger diameter than race springs. For the front, I designed custom top mounts that use large spherical bearings (rated for approx. 8000lbs axially) to locate the shock shaft and coaxial spring mounts. I wanted a no-compromise setup and this accomplished it. The stock set used rubber bushing to locate the shaft and the spring simply rested against the top mount. The problem is when you run much lower, the shaft becomes angled out of the designed range, and without accounting for that it starts sideloading the shaft which can lead to premature wear. Using a spherical bearing allows the shaft to angle freely without being sideloaded. The spherical bearing also eliminates the spring and damping of the rubber mount which makes everything more precise. Likewise, having the spring mounted on a coaxial perch means that the spring is always inline with the shock shaft and never experiencing bending loads. I also added thrust washers which allow the spring to rotate freely as it compresses This keeps the spring rate more consistent. You will find spherical bearing top mounts on all the high dollar setups for NC and even NA/NB Miatas (Xidas have them as an upgrade option).
Finally, the shocks themselves were re-valved by RE Suspension in NC. They're a big-time suspension shop for professional race teams. The dyno curves look very similar to Ohlins DFV's when tuned for these spring rates. Overall, the setup is very purpose-built for autox and track driving and extremely neutral. You could easily go up in spring rate front and rear some without having to re-valve and can also adjust the internal nitrogen charge for subtle tweaks. It is comfortable enough on the road to not be punishing but is not Cadillac plush. Last cool thing about the suspension is that since they use Bilstein internals, they can be easily and cheaply re-valved if so desired.
The RS3-v2's have very minimal wear. I don't have a measurement of tread depth but could get it later for you. They are essentially new though and almost full depth. The tires on the stock 17" wheels have lots of tread life left in them too I would say 15-20,000 more miles. I attached a picture of one of each wheel that I took a while back and thought was funny showing how much more serious the AutoX wheels are.
https://www.dropbox.com/sh/o9m0vah7x...5koADKIka?dl=0
I wrecked this car unfortunately and they totalled it and I bought it back. It runs great and needs a bit of bodywork/replace some panels and door but could make a great trailer queen as is or a rebuild. I was going to keep but don't have the time to get it rebuilt and race it. Low miles. Below are specs. I'll be posting this here for a week before I post on FB and Craigs.
- 2006 Miata Grand Touring
- 69k miles
- Single aftermarket exhaust I believe its a roadstersport street.
- Stock strut bar
- Two sets of tires
- Stock rims with tires plenty of tread
- TRM C3 17X9 on Hankook RSV-V2
- 6 Speed Transmission
- Limited slip diff
- Cloth Top in great condition
- Leather seats
- Stereo with Bluetooth
- Driver seat lowered 2”
- Coilover suspension see below for details
Extra parts
- Open Diff
- Stock rims with tires plenty of tread
Here is what the original owner did for suspension.
The coilovers were built by me. I am a mechanical engineer and a bit of a suspension geek and that has been my project for about 6 month. They started as Bilstein Sports which I converted to take-aparts. Basically depressurizing and then brazing in nitrogen fill ports and refinishing them. Also had new snap ring grooves machined in the bodies lower so that the coilover sleeves would fit properly. Coilover sleeves fit over the bodies for height adjustability. The spring rates chosen were based off of ride frequency analysis and are 450lbs/in front and 400lbs/in rear. This set up works incredibly well with a front sway bar and no rear and you will find many top drivers running similar rates, Goodwin included. It also happens to ride pretty well due to the "flat ride" concept. The springs specifically are Hyperco brand which is considered to be the best in the industry. The fronts are 8" free length and the rears are 7" free length with zero rate tender springs to keep everything tight. The rear has custom 3d-printed mounts to locate the springs since the stock springs are a much larger diameter than race springs. For the front, I designed custom top mounts that use large spherical bearings (rated for approx. 8000lbs axially) to locate the shock shaft and coaxial spring mounts. I wanted a no-compromise setup and this accomplished it. The stock set used rubber bushing to locate the shaft and the spring simply rested against the top mount. The problem is when you run much lower, the shaft becomes angled out of the designed range, and without accounting for that it starts sideloading the shaft which can lead to premature wear. Using a spherical bearing allows the shaft to angle freely without being sideloaded. The spherical bearing also eliminates the spring and damping of the rubber mount which makes everything more precise. Likewise, having the spring mounted on a coaxial perch means that the spring is always inline with the shock shaft and never experiencing bending loads. I also added thrust washers which allow the spring to rotate freely as it compresses This keeps the spring rate more consistent. You will find spherical bearing top mounts on all the high dollar setups for NC and even NA/NB Miatas (Xidas have them as an upgrade option).
Finally, the shocks themselves were re-valved by RE Suspension in NC. They're a big-time suspension shop for professional race teams. The dyno curves look very similar to Ohlins DFV's when tuned for these spring rates. Overall, the setup is very purpose-built for autox and track driving and extremely neutral. You could easily go up in spring rate front and rear some without having to re-valve and can also adjust the internal nitrogen charge for subtle tweaks. It is comfortable enough on the road to not be punishing but is not Cadillac plush. Last cool thing about the suspension is that since they use Bilstein internals, they can be easily and cheaply re-valved if so desired.
The RS3-v2's have very minimal wear. I don't have a measurement of tread depth but could get it later for you. They are essentially new though and almost full depth. The tires on the stock 17" wheels have lots of tread life left in them too I would say 15-20,000 more miles. I attached a picture of one of each wheel that I took a while back and thought was funny showing how much more serious the AutoX wheels are.
https://www.dropbox.com/sh/o9m0vah7x...5koADKIka?dl=0
Comment