Lets review: Tamiya’s 1996 Porsche 911 GT1 kit is mostly accurate, and concisely engineered. The 2 sides of the transmission each represent 6 or 7 pieces from the actual car, and the top and final drive piece also includes the rear suspension bulkhead, six space-frame tubes, rear suspension rocker bases and two adjustment knobs for the external shock absorber reservoirs.
But a few of the things provided aren’t quite what you see in pictures of the real thing. And a number of things in the pictures aren’t in the kit. In describing the kit I touched on The cooling air ducts for the rear brakes, and the breather catch tank.
Rear Brakes Cooling Air Scoops and Ducts:
The back of the scoop and ducts need to be made or bought. They should look like
Link to a jpg URL: Displays the URL, not the thing the URL points to. Not worth it.
Image of a jpg URL: Displays a really large image, click does NOT link through. Big, but not worth it.
naked .HTML URL: Doesn’t display image. Can be clicked through.
The catch tank can be re-worked to fix the shape problem. So lets start with what can be fixed or re-worked. Then the missing bits that need to made or found.
If you haven’t seen Renaissance Model’s reference pages you’re in for a treat:
RM galerie de details:
RM Front Page:
The front page is French/English, deeper in, French only.
The carbon brake disks (380 mm diameter 37mm thick) are ventilated, by
round holes on straight radial lines. Rotating cutter? Formed by tooling? They follow a two-holes, space, one hole, space, two-holes pattern. My guess, 10 sets of 3.
In a picture showing < 180 degrees I count 14 holes. 2 X 14 = 28, but 28/3 is 9 1/3, not an even pattern. Symmetry around the disk seems likely to be important. The smallest number greater than 28 that is evenly divisible by 3 is 30.
Think of the 1 hole-space-2 holes-space pattern as 5 points, 3 of which are holes, 2 of which are not. 0-00- so the disc goes: 0-00-0-00-0-00-…If 10 sets of 3 holes, is right, 360 degrees/50 points = 7.2 degrees/point. 5 points = 36 degrees, 360/10.
Brembo’s web site:
lists 36 as the minimum number of cooling holes for GT1 brakes, in 2018.
Robert Muschitz’s marvelous photo:
Robert M again:
Brake disk calipers.
Brake disk calipers should have open backs, through which the pads should be seen. The kit parts have closed backs, but can be filed down to shape to expose the disk, and the pads, same radius. Mind you file for a curve.
A cardboard template from the rest of the disc would help. A brass-colored brace connects the two halves, at the back. Something to make, but not much. Stretched parts-tree polystyrene, metal wire, or mechanical pencil “lead” will suffice. Two “U” shaped wire bails cross the gap behind the pads and across the disk. Small steel wire, mini staples?
The wheels cover this area, but if you want to back off a wheel (or more) for an informal pose, some time on the backs of the calipers will be rewarded.
This should be a link:
<a href="http:////embedr.flickr.com/assets/client-code.js” target=”_blank”>Frame Grab from Callas RennSport Rohr yellow car front brake caliper” https://www.flickr.com/photos/wbaiv/50231600796/
This should also be an image but not a link
The real thing:
Cold air to turbo inlet pipes.
Tamiya provide part A32, connected to the roof air scoop, with left and right takeoffs going to the turbo-compressors and the center going down through the air to air inter-cooler. Unfortunately, the two turbo-bound pipes on Tamiya’s part have a flat bottom, simplifying the mold, but changing the cross section of the pipe. Straight lines that should be curves are eye-catching.
These photos show how it should look.
Emphasize Division Between The Left and Right Inter-cooler Outputs.
Tamiya supply a single piece for both intercoolers, the ducts that take their outputs to the sides and the plenum “log”s that feed the throttle and injector for each cylinder. The division between the ducts on the two sides aren’t as clear as photos suggest:
Remove One or Both Pairs Of Shock Reservoirs.
Tamiya provides a pair of shock reservoirs attached to the sides of the final drive. And a second pair attached atop the rear anti-roll bar housing. One place or the other was common for different cars at different times. Some shock reservoirs are seen attached to the diagonal tubes from the top of the transmission to the rear suspension bulkhead.
Other cars, other times, reservoirs are on top of the final drive housing, or on either side of the back end of the transmission. Or asymmetrically disposed somewhere across two of the places listed. There is clearly the potential for a table showing where the reservoirs were and whether gray metallic painted reservoirs and shock bodies, or red metallic paint painted sets were used. And what color for the springs. Indexed by chassis number and markings. More opportunities to excel!
GT1 109, gray metallic, reservoirs on diagonal tubes. Metallic / stainless braid hoses and banjo fittings. Glossy black springs. Glossy black three-bolt top of the spring. Black-red-black lower end stop.
GT1 104 Gray metallic, reservoirs on either side of the final drive. Aluminum colored cloth heat reflective wrap on hoses. Glossy, slightly darker red springs. Blue anodize banjo fittings. Black + silver / gold metallic three-bolt top of the spring. Red, Red, Black lower end stop.
GT1 101 Red metallic, reservoirs on carrier at back edge of final drive. Metallic braided hose or braid-like cloth.Semi-gloss black spring. White (silver) metallic banjo fittings. Dark Gray / Gray Blue on cone-shaped top of spring .
GT1 117 Red metallic, reservoirs at back edge transmission. Black rubber/vinyl hoses. Glossy dark red spring. White (silver) metallic banjo fittings. Dark Gray / Gray Blue anodize on cone-shaped top of spring. Black-black-black lower end stop.