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As I believe was pointed out in another thread, the A2-chassis '87 Golf 1.8 16V is actually more aerodynamic (lower Cd), particularly in race trim (windows down, etc.).[/b]
And when this is multiplied by the much smaller frontal area of the s-roc the result is less drag.
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Yes, the Scirocco has front brakes that are probably overkill for braking, but also weigh a lot more (both unsprung and rotating inertia) than the perfectly adequate vented front brakes on the Golf. On many tracks, I suspect that the lighter brakes might have the advantage.[/b]
We can't write the rules to accomodate individual system designs, but they are correctly written to consider basic design parameters. In those terms 10.1" brakes are better than 9.6" brakes. I can make my 9.6s work, but honestly could use more force in my system and would find 10.1s beneficial.
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Back on point, though, they are completely different cars aside from the long block (even the manifolds and motor mounts are different). [/b]
I just installed a used suspension from a 1984 GTI on my 1986 GTI this year. There were some minor changes to make, but they are not fundamentally different from a race car engineering perspective.
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On the actual Scirocco weight issue, please keep in mind that the 86-88 Scirocco 16V has the same suspension and front hubs as its 1975 predecessors. This is well-known as a serious weak link in these cars, so they should not be forced to carry too much extra weight. For the record, I do still run the stock ones in my '83, but I would never protest anyone for running non-compliant larger ones after some of the failures/crashes that I've seen. Contrast that with the '87 Golf 16V, which had better ones, and even those were significantly strengthened yet again for the '88-'89 Golf 16V (same ITCS line).[/b]
Go take a look at the hubs on that 16v rocco next time. I don't have a set handy anymore, but I could SWEAR they were the larger bearing hubs. Let me know what you find. Regardless, this is part of the car selection process in IT.
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Edit: When comparing 16V VWs, don't forget that even though the '89 Mexican-built Golf GTI 16V didn't get them, the '89 German-built Jetta GLI 16V went to 10.1 inch (256 mm) front brakes that year. I just noticed that the ITA VW brake specs listed in the '06 ITCS are completely wrong for the Jettas.
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You are right. The only A2 car with the 10.1 inch brakes is the 16v Jetta. It should be heavier than a 16v Golf IMO.