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05-08-2009, 03:02 PM | #1 |
Drives: 2007 Yaris Hatchback Join Date: Jul 2007
Location: Beaufort, South Carolina
Posts: 388
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Weight Reductions
I did not know where to put this, or if it already exists on here (I coudn't readily find anything), and technically is could fall in a few topic categories (Performance, Fuel Economy, etc.) but...
I think a compiled listing of all of the weight reduction methods would be helpful. If you're interested or if my numbers are way off, please chime in! Rotating Mass Reductions: Wheels covers: ~3.5lbs Lighter wheels: 1-10lbs, each wheel (Volk 14", ~10lbs lighter) ---- Lighter Tires/Smaller Total Diameter Tires This seems to be a larger determining factor than wheel weight... Because the weight is at the farthest reach of the rotation, it has a huge impact, even 1-2 lbs has a massive effect. On here: http://www.the-welters.com/racing/rotational.html is a spreadsheet to dial in some numbers and get a guestimate of dead weight equivalence through physics. I inputed this: Car and Wheel Dimensions: wheel 1 wheel 2 Wheel size (inches) 15 15 Tire width (mm) 185 195 aspect ratio 60 55 wheel weight (lbs) 17 13 tire weight (lbs) 19 21 Total wheel weight 36 34 Car weight (with wheel style 1) 2350 Engine Torque 103 Engine HP 106 Car 0-60mph time 10.8 The result is that tire+wheel #2 is 2lbs dead-weight heavier. If the tire weight of wheel 2 combo is changed from 21 to 18 (there are a few that exist that light) the effect is massive, equating to a ~70lbs drop in dead weight. Download the spreadsheet and play around with it, you'll see what I mean. Tirerack has a tire weight listing for each brand, as well here is a small compilation I found. tire weight listing: http://www.team-integra.net/forum/di...PagePosition=1 So what does this all mean to me? If you keep stock steel wheels and simply buy tires that are lighter and slightly lower profile, the dead weight savings is equivalent to almost 30lbs drop in dead-weight, or 1.5hp, just by selecting tires. (195/55/15 @ 18lbs == 32lbs, 195/50/15 @ 18lbs == 49 lbs) The extreme of this could be: Volk 14" (te37, 14x6, ~8lbs) with a 195/45/14 tire (toyo tr1, ~15lbs) would be a weight savings of 235lbs chassis weight. ----- Alloy pulleys: ~5lbs front reduction Flywheel: ~10 lbs front reduction Dead Weight Reductions: Carbon fiber hood, hatch, paneling: 5-15lbs front and back reduction Smaller battery: 5-20lbs front reduction (smallest Braille, ~20lbs lighter) Bucket Seats: x lbs, mid-front reduction Back Seat Removal(Standard not Split): ~55 lbs mid-rear reduction Muffler (Alloy/Carbon): ~5 lbs/8 lbs rear reduction Lexan rear-window: ~30-50lbs rear reduction (Not sure how legal this is) Remove spare tire+jack: ~25lbs rear reduction Owners manual: ~2.0lbs front reduction Flip up deck ~2 lbs rear reduction Deck carpet ~2 lbs rear reduction Tool trays with tools ~7 lbs rear reduction Steering wheel replacement (from stock+airbag): ~2-5lbs? driver-side front reduction note: I do not know the weights of all items, and thus put an 'x' and is not calculated in total dead weight total: ~70-180 (-100lbs dropped == +4.5 hp) more to come... edit: found these thread about someone who has reduced their car's weight http://www.yarisworld.com/forums/showthread.php?t=3176 http://yarisworld.com/forums/showthread.php?t=31397 Just to put things in to perspective: the power to weight ratio of the yaris hatch is about 1:22.8, so for every ~23lbs dead weight we drop, in a way that is the equivalent of +1 hp; consequently, at 100lbs dropped, it will be closer to 1:20 ratio, so less weight is needed for each additional hp after that. Last edited by scape; 11-12-2010 at 10:02 PM. Reason: Adding relatable threads |
Tags |
fuel efficiency, performance, reduce, weight |
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