AWW$HEEET Posted April 29, 2011 Report Share Posted April 29, 2011 what does reducing unsprung weight actually acheive? could it be equated to power increase? Quote Link to comment Share on other sites More sharing options...
TTQ B4U Posted April 29, 2011 Report Share Posted April 29, 2011 IMO unsprung wieght has a tremendous impact on performance. Hell, ask anyone involved in engineering of race cars Reducing unsprung weight will improve acceleration, braking ability, just about all all aspects that are critical to performance. I can easily feel the impact of putting my 18" 24lb stock wheels on my car vs the 17" 17lb OZ's I also run. Quote Link to comment Share on other sites More sharing options...
Patterson Posted April 29, 2011 Report Share Posted April 29, 2011 Think of it as installing a LW flywheel. Reduction in weight is always gonna help. When you're talking about unsprung, it'll help with acceleration, braking as well as handling. The less parisitic drag the better. Adding power is a good thing, but it will only help with acceleration. Quote Link to comment Share on other sites More sharing options...
CRed05 Posted April 29, 2011 Report Share Posted April 29, 2011 I feel like this was recently brought up somewhere...maybe I saw it on Top Gear about how BMW decreased unsprung weight on the new M3, or maybe somewhere else. Anywho... It makes sense that it would improve handling, acceleration and braking. Quote Link to comment Share on other sites More sharing options...
AWW$HEEET Posted April 29, 2011 Author Report Share Posted April 29, 2011 I feel like this was recently brought up somewhere...maybe I saw it on Top Gear about how BMW decreased unsprung weight on the new M3, or maybe somewhere else. Anywho... It makes sense that it would improve handling, acceleration and braking. I think I can lose about 4lbs from each corner with wheels alone. hmm. anyone know if eagle F1s are heavy/light in the tire world? Quote Link to comment Share on other sites More sharing options...
greg1647545532 Posted April 29, 2011 Report Share Posted April 29, 2011 Accelerating in any direction takes energy, so if you slam on the gas, hit the brakes, turn left or right, you're using energy to accelerate the mass of your car in a certain direction. This is why everyone wants to reduce weight in a racecar. It's a no-brainer. Rotational weight (i.e., wheels, flywheels, engine internals) is even worse, because the effect gets multiplied by some factor based on the rotational speed and the radius. Accelerating and stopping your wheels rotationally takes more energy than if you were to throw them in the trunk and drive around with them. It's also a no-brainer. Unsprung weight often gets overlooked, but it includes your wheels, brakes, hubs, and some control arms. When you throw the car into a corner, it's very clear that you're using energy to alter the direction of the mass of your car. When you go over a bump, it's not as clear, but when you think about it, you're moving the wheel/brake/hub/control arm mass up and down, and that also takes energy. That energy ultimately comes from gasoline. The car itself might not be moving up and down, but the unsprung weight is. On the racetrack, any time you change directions quickly or drive over bumps or elevation changes, your unsprung weight is moving more than your sprung weight. Not only is it moving, but then you need to stop it from moving. To stop it from moving, you use the shock absorber to slowly transfer the energy into the mass of the car. Believe it or not, you then use more energy from gasoline to counteract the energy received from the shocks. This is why people care more about unsprung weight than sprung weight. Reducing unsprung weight has a greater effect on the overall "snappiness" of the car. Quote Link to comment Share on other sites More sharing options...
ansonivan Posted April 29, 2011 Report Share Posted April 29, 2011 Do it man, do it. http://forums.pelicanparts.com/uploads15/joke+brake+rotor+over+drilled1250112699.jpg Quote Link to comment Share on other sites More sharing options...
AWW$HEEET Posted April 29, 2011 Author Report Share Posted April 29, 2011 LOOL. BRB, Anson you got a drill press I can use? Quote Link to comment Share on other sites More sharing options...
Patterson Posted April 29, 2011 Report Share Posted April 29, 2011 That looks like some of the neighbors work.. And please tell me thats not the Scirocco. Quote Link to comment Share on other sites More sharing options...
greg1647545532 Posted April 29, 2011 Report Share Posted April 29, 2011 I hope to god that's a dedicated drag car. Based on the A arm and the 4-lug I'm guessing it's a Fox body, so no real loss I suppose. ETA: Dammit, didn't even notice it's FWD. Nevermind, I = tard. Quote Link to comment Share on other sites More sharing options...
TTQ B4U Posted April 29, 2011 Report Share Posted April 29, 2011 ETA: Dammit, didn't even notice it's FWD. Nevermind, I'm an iTard. fixed it for the Apple lovers of the world. Quote Link to comment Share on other sites More sharing options...
greg1647545532 Posted April 29, 2011 Report Share Posted April 29, 2011 Need that as my custom title. Quote Link to comment Share on other sites More sharing options...
Patterson Posted April 29, 2011 Report Share Posted April 29, 2011 I hope to god that's a dedicated drag car. Based on the A arm and the 4-lug I'm guessing it's a Fox body, so no real loss I suppose. ETA: Dammit, didn't even notice it's FWD. Nevermind, I = tard. Nope, its a VW. Unfortunately I reconized it by the oil pan, and how the crank trigger is rigged on there. God i need help. Quote Link to comment Share on other sites More sharing options...
ansonivan Posted April 29, 2011 Report Share Posted April 29, 2011 Drill press is out of order at them moment but the cutting torch is ready to rloll, just need a steady hand. The car pictures was an scca autocross rabbit which actually kicked a huge amount of ass, I think they banned ultra-drilling the next season. Quote Link to comment Share on other sites More sharing options...
AWW$HEEET Posted April 29, 2011 Author Report Share Posted April 29, 2011 Drill press is out of order at them moment but the cutting torch is ready to rloll, just need a steady hand. The car pictures was an scca autocross rabbit which actually kicked a huge amount of ass, I think they banned ultra-drilling the next season. lol, i would love to see the definition "ultra-drilling" Quote Link to comment Share on other sites More sharing options...
Das Borgen Posted April 29, 2011 Report Share Posted April 29, 2011 Drill press is out of order at them moment but the cutting torch is ready to rloll, just need a steady hand. The car pictures was an scca autocross rabbit which actually kicked a huge amount of ass, I think they banned ultra-drilling the next season. I don t think so...there is a badass C-Street-Prepared miata that has ultra-drilled rotors and weighs less than 2000 lbs..... he overheats rotors in a single 50second run (ridiculous) Bill Schenker http://images44.fotki.com/v1355/photos/1/1209929/6823155/CSP-vi.jpg http://lh6.ggpht.com/_-G4gMz5adZc/TMhisldvsQI/AAAAAAAALK4/X2tazqkQhTg/race-the-tire-rack-scca-solo-nationals-img16_gallery_image_large.jpg Do it man, do it. http://forums.pelicanparts.com/uploads15/joke+brake+rotor+over+drilled1250112699.jpg why is the caliper still there? calipers are heavy Colin Chapman once said: Simplify, then add lightness OP....i changed to lighter wheels (7lbs per corner) and immediately noticed quicker turn-in at corners........less weight is always a good thing on cars....less weight makes you faster everywhere but power only makes you quicker in a straight line. That explains why a turbo miata with only 170-200whp will own left, right, up and down Corvettes on a road course. Less weight also makes you use up less brake pad Quote Link to comment Share on other sites More sharing options...
ansonivan Posted April 29, 2011 Report Share Posted April 29, 2011 lol, i would love to see the definition "ultra-drilling" Stop by an Amish farmhouse at exactly 8:30 on any weeknight to witness ultra-drilling. 8:30 is ultra-drilling hour for those baby-making bastards. Quote Link to comment Share on other sites More sharing options...
Patterson Posted April 29, 2011 Report Share Posted April 29, 2011 Stop by an Amish farmhouse at exactly 8:30 on any weeknight to witness ultra-drilling. 8:30 is ultra-drilling hour for those baby-making bastards. First hippies, now the Amish. My god man. Quote Link to comment Share on other sites More sharing options...
AWW$HEEET Posted April 29, 2011 Author Report Share Posted April 29, 2011 First hippies, now the Amish. My god man. Fucking amish bastards. Quote Link to comment Share on other sites More sharing options...
John Bruh Posted April 29, 2011 Report Share Posted April 29, 2011 http://images.icanhascheezburger.com/completestore/2008/7/4/pimpmyrideam128596768710912836.jpg :megusta: Quote Link to comment Share on other sites More sharing options...
ImUrOBGYN Posted April 30, 2011 Report Share Posted April 30, 2011 Didnt see it mentioned but use this as a test for unsprung mass. Tie a small weight to the end of a leash or something. Swing it around. Now, tie a big 5lb weight to it. Swing it around. Notice how much heavier it gets as you swing it? You're exponentially increasing the mass of the object as you swing it out and thereby having to increase the amount of energy needed to maintain it. This is the same on your car. It's said that for every pound of unsprung weight you remove, is equivalent to removing 8lbs of static weight. Of course, that wont come into consideration when the car isn't moving, however, once you get going it equates. And of course, nothing improves every aspect of a vehicle's performance except removing weight. Unsprung weight is weight + bonus. Quote Link to comment Share on other sites More sharing options...
AWW$HEEET Posted April 30, 2011 Author Report Share Posted April 30, 2011 Itt: good info. Quote Link to comment Share on other sites More sharing options...
ansonivan Posted May 1, 2011 Report Share Posted May 1, 2011 Early e39's used aluminum front and rear calipers, might be possible to install them on your spindles with a little work. If you're going to that trouble it's probably smarter to go Willwood or other aftermarket race calipers just to open up the pad possibilities. edit: Early e39 528i and e36 M3 actually share the same front brake pad, offset is likely buggered but at least the pad size is correct. Quote Link to comment Share on other sites More sharing options...
AJ Posted May 1, 2011 Report Share Posted May 1, 2011 you guys talking about wheel weight are wrong and right at the same time. yes that is unsprung weight so you are correct. what you are wrong about is the reason why your car handles better with lighter wheels. its not because of the unsprung weight its because of the rotational weight reduction. now on topic this is roughly what you have unsprung. i say roughly because it could be different from car to car based on how the components are mounted. Front: 100% of: Rim Tire Spindle Brake Bearings 50% of: Sway bar Shock Control arms Spring Rear 100% of: differential Rims Tires 50% of: Sway Bar Shocks Springs Quote Link to comment Share on other sites More sharing options...
unfunnyryan Posted May 1, 2011 Report Share Posted May 1, 2011 Long ago I heard that every pound of unsprung weight removed is equivalent to 4-5lbs of sprung weight removed, as far as performance gains. If lightweight rims and wheels could net you 10lbs a corner, it adds up to a pretty significant amount. Quote Link to comment Share on other sites More sharing options...
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