924 Carrera GT Technical Summary
The 924 Carrera GT uses a turbocharged version of the 924's 1984cc engine with an intercooler. Externally the 924 Carrera GT is similar to a 931, but with wider polyurethane wings at the front and rear, and a polyurethane hood scoop. Only red, black, and silver 924 Carrera GTs were made, the 924 Carrera GTS was only available in red. The styling exercise and full race cars were white. The M31.50 uses the standard 1984cc cast-iron Porsche 924 block and uprated parts as used on the M31.30 Series II 931, such as the aluminium head, camshaft, and cooling system. Getrag produced the G31 gearbox for the 924 Turbo, and it is perhaps the strongest in the Porsche 924-944 range, much of which used an Audi-derived 016 transaxle. The G31 uses a number of parts from the 915 and 930 transmissions such as the baulk ring synchromesh and bearings. The 924 Carrera GT gearbox is designated G31.03, serial numbers start 3103. It is similar to the 931 unit, with the same ratios, but has strengthened gear sets to handle the increased horsepower. A limited slip differential was an option on all G31 equipped cars. Like many racing gearboxes the G31 has a "dogleg" first gear; down and to the left, to reduce the risk of accidentally engaging first at speed. Second is where first would be on a normal H pattern box, third is where second is, etc, etc. Reverse is above first. All Porsche 924s have MacPherson struts and coil springs at the front, trailing arms with torsion bars at the rear. The 924 Carrera GT has a lightly uprated version of the Series II Turbo suspension with strengthened rear trailing arms.
On the BlackVue it has 鈥淧ITTASOFT鈥?in white letters on the bottom of the mount facing outside. We鈥檇 rather go more incognito so we used a black Sharpie pen to black out this logo before mounting. It may depend on the tools you have available, but we used a fish tape, a screwdriver with a T15 bit, a small flat screwdriver, a black sharpie pen, scissors and several feet of string. Wire strippers and diagonals are useful for the wiring. A soldering iron and solder may be required depending on which power method you choose. Most Model S cars include an always on power source in the headliner, behind the microphone panel. To open this panel, pull down using your fingers, at the back edge. Two snaps will release and it will hinge down. There should be a 4-pin, 3-wire connector taped to the panel, or in Europe, cars with the pano roof option may be connected to the intrusion module (part of the EU security package).
During a small period in late 2013 to early 2014 some owners were unable to find the connector and it may be missing or tapped up in the wire bundle.. If missing, you鈥檒l need to route the wires to another point, such as the ODB II connector in the driver鈥檚 footwell. Pin 1: 12v, wire color: Red/Dark Blue (older cars and AP2 cars), Tan/Black (after Oct-2014, before AP2). We鈥檝e also heard one unidentified car had a gray wire! You DO NOT want to install or use PowerMagic (BlackVue) on the S or X. It will only cause problems, but may be needed in the 3. There are two microphones with 3 wires each. Do not connect to either of these, as there is no power on these connections. If you have the 4-pin intrusion module connector, this is the best source for always-on power. All cars made after September 16, 2015 have this connector, as do most 2012-2013 cars. For a BlackVue installation You鈥檒l need the BlackVue Hard Wiring Power Cable.
It may have been included with your package, but it not, you鈥檒l need to get one. We made a dashcam cable project that provides power without any cuts or modifications to your car using the same connectors as Tesla uses. It also works if you have the intrusion module or plan to buy one in the future. Another option if you don鈥檛 have or plan to have the intrusion module is to use this 4-Pin Fan connector that will fit the connector. Wires are pre-attached, so cut off the unneeded female end and solder your power leads to the pin 1 and 3 pigtails or use solderless connectors. 12VDC, and pin 3 is a red wire for ground. For our BlackVue DR900S installation, we cut the long two-wire cable to about 18鈥?and reattached the fuse. If using our dashcam cable project, just insert the dashcam power to the T connector and clamp shut.
If using the fan connector, solder the wires. Other dashcams should have similar cables and can be attached to power the same way. If using the fan connector, the wire colors do not match up as you might expect. Pin 1, blue, connects to the fuse. Pin 3, red, connects to the BlackVue black wire. The other end of the fuse connects to the BlackVue red wire. We used some heat shrink tubing to protect the connections. 1. You can tap into the wires with 20-24 gauge red Posi-Taps. 2. If the connector is not attached to a module: - You can use a Male header strip. Cut off 3-pins of the strip and solder the red wire to pin 1 and ground to pin 3 (pin 2 is unused). 12v lead. On my header, I pulled out the header center pin 2, which made it easy to tie wrap the header to the Tesla connector (to avoid coming apart under vibration). For the Thinkware F770/F800, you need to buy the 3-wire hardwire kit.