Car Year & Model: 70 Ford Mustang Fastback
Competing in: NASA TTU & Track Days
Front Clip/Suspension: GT Track-Warrior
Rear Clip/Suspension: GT Track-Warrior
Engine: Track-Warrior 3 LS7 700 HP
Trans: PPG Sequential Shift T56 6-Speed
Brakes: StopTech 14” ST60/ST40
Owner: Greg Weld
Builder: Randy Chastain – One Off Customs
Here are some photos with the mid-frame structure done at Randy Chastain's "One-Off Customs" shop.
A few things that might not be apparent from the photos are:
* The outer rails are 2x2 x .120" wall
* The inner rails are 2x3 x .065" wall
* The cross bracing is 1x2 x .065" wall
The cross bracing is flush with the top rails, leaving a 1" void between the bottom of the outer rails & the bottom of the cross bracing. This is where we run the brake lines & car wiring to the rear for fuel pump, tail lights, etc.
The brake lines utilize two bulkhead fittings that go through the dog legs (at the firewall) & rear crossmember. The main fuse block, Holley ECU, No-Lift Shift Controller & Data Logger all mount on the backside of the firewall, in the cockpit & under the dash on a rubber insulated panel to reduce NVH to the electronics. The wiring goes through the floor & into to that same 1" void to the rear crossmember ... where it then goes into & through the rear frame rail back to the cell & tail lights.
The engine & trans are just "mocked up" & locked in place in these photos. We do this so the actual engine & trans mounts can be built & the exhaust can be run. The headers & exhaust run down the center of the car.
Later, there will be a "tunnel backbone" structure built into the car. It gets super insulated to help keep the driver cool. Plus JET-HOT High Performance Coatings coats the headers & exhaust INSIDE & OUTSIDE with with their top line 2000° thermal barrier. This is to reduce heat transfer to the transmission & driver.
If you look close, you'll notice Randy fabricated a thin steel panel that attaches to the bottom & top of the fiberglass body rockers. The panel has 6 rivnuts in it to allow the chassis to bolt to the rockers. You can see the milled holes in the frame rails that allow access to these bolts from under the car (with the belly pan removed.) The body is NOT quickly removable. Impossible to seal off the cockpit if it was. But the body can be removed in about an hour if needed for crash repair.
We're going to the Optima Ultimate Street Car event in Las Vegas for the weekend. So no updates until Monday.