and how about if my car weighs, 2450 pounds I rip out the stereo??? what the flip??
If your car weighs 2450 pounds and regularly goes 100mph, you'll want to look at something better than the solid 9.4" front rotors. If your car weighs 2450 pounds and regularly goes 125mph, then the 9.4" vented fronts will be marginal and you might want to upgrade.
But thermal loads are related to kinetic energy, which is 1/2 * mass * velocity * velocity. So if you have the 9.4" vented fronts, and your car weighs 2450 pounds, the practical top speed for best performance is slighly lower (maybe ~123mph). Even at 2750 pounds, those brakes are probably good for 115mph. But that's probably not an issue for a 1984 diesel Jetta.
dude I asked what I could put on that was bigger because I do alot of mountain driving and need the braking power going down hills.
Use the gears for long grades. Even the biggest brakes will overheat if you ride the brake pedal down a long grade. Brakes are for slowing down, not for holding speed on a downgrade. The diesels are really good at holding speed with gearing due to the high compression.
also a hint, read my sig it tells you what I have.
I only noticed 3 Chrysler products in your sig. I missed the 1984 Jetta diesel that you parked in the back of the minivan.
oooh slower by .0001mph becausen now I have 10 pounds of mass instead of 8, my god I am more worried about MY safety and other people than greatest fuel economy or speed.
Most people with VW diesels, especially the normally asthmatic 1.6 diesels, care about the cars ability to accelerate to highway speeds. Heavier wheels, tires and brakes will add seconds to your zero to 60mph times. On my 1984 Jetta diesel, 14" wheels and tires that weighed 36 pounds per corner added a half second to my zero to 60mph time compared to the stock steel wheels with some cheap, heavy 175/70R13 tires on them. And I picked up another quarter second swapping on some light weight alloy wheels and lighter tires. If you are looking at 15" Dodge Daytona wheels and 10.1' front brakes, expect to be a second or more slower from zero to 60mph.
Also, you mention fuel mileage. Heavier wheels and tires will hurt fuel economy. Those 36 pound 14" wheels and tires got about 1.8mpg less than the light weight 13" wheels and tires in mixed highway/rural small town driving. It will depend some on the weight of your wheels and tires, but I think you can expect two mpg or more penalty from the 15" wheels.
And if mountain driving means twisty, bumpy, poorly maintained rural secondary roads, then handling might also be an issue for you. These cars really like light weight wheels and tires, especially on the back. They get really sure footed and handle excellent with wheels/tires that weigh 30 pounds per corner or less (on stock-ish springs). 40 pound wheels don't stay on the ground over bumps because the weak rear springs can't control the extra weight, so the car feels loose and disconnected from the road with heavy wheels and tires. Stiffer springs help some, but ride quality suffers with the stiffer springs (and with the shorter sidewalls with larger wheels).
fyi you come off alittle prickesh, don't take that the wrong way.
thanks for the input but I know about rotating mass
Perhaps I get a bit frustrated answering the same questions over and over. Sorry if that annoys you.