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Thread: How much does that weigh? (Mirage part weight list)

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    Still Plays With Cars Loren's Avatar
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    How much does that weigh? (Mirage part weight list)

    Some of us want to know what things weigh. Be it for performance or fuel economy or just general geekiness, we want to know!

    That's what this thread is for. If a moderator wants to try to keep it organized and maybe maintain a list in the first post, I won't complain. I'm not likely to do so myself, however.

    Loose rules: +/- half a pound is fine for most things. If it's something that weight matters a lot on (like wheels), +/- a tenth pound is preferred. And if it's something that weighs less than say 8-10 pounds, a tenth is preferred. Most digital bathroom scales are either .5 or .1 accuracy. For better than that, you need a postal scale or a kitchen scale. (just don't tell my wife that I weigh car parts on her kitchen scale)

    In no particular order, here are some things that I've weighed:

    Body / Exterior:
    The whole car: 2057# (this is a 2015 Mirage DE 5-speed, and this is with an added rear swaybar and coilover kit... so, +/- 20 pounds?)
    Corner weights: (taken with the weight above) Front: 573/648, Rear: 362/474
    Rear Wiper Assembly: 1.7#
    Hood: 20.5 pounds including the insulation and washer hoses and jets


    Suspension:
    Front Swaybar: 5.9#
    Front Swaybar End Links & Brackets: 1.5#


    Brake
    2015 Front Rotor - 7.55 pounds - 229mm (9") OD
    2015 Caliper Bracket - 1.22 pounds
    2017 Front Rotor - 9.12 pounds - 251mm (9.9" OD)
    2017 Caliper Bracket - 1.45 pounds
    Brake Pads, one wheel (barely worn at 20k miles) - 0.91 pounds
    Brake Caliper - 4.38 pounds
    Caliper Pins - 0.26 pounds
    Brake Hose - 0.35 pounds


    Interior
    Shift Knob: 120g
    Rear Seat Headrests: 1.1 pounds each
    Floor Mats (set): 4 pounds
    Jack: 3.3 pounds
    Tool Kit: 2.8 pounds
    Spare Tire: 19.1 pounds
    Left Headrest: 1.1 pounds
    Right Headrest: 1.1 pounds
    Left Seat Back (includes center seatbelt reel and brackets): 13.7 pounds
    Right Seat Back (includes brackets): 11.2 pounds
    Seat Back Bottom Bolts (6): 0.4 pounds
    Seat Back Latching Posts (with 6 bolts): 1.0 pounds
    Left Seatbelt Reel (with 3 bolts): 2.2 pounds
    Right Seatbelt Reel (with 3 bolts): 2.2 pounds
    Seatbelt Buckles (3, with 3 bolts): 1.3 pounds
    Spare Tire Cover & Carpet: 3.2 pounds
    Cargo Cover: 1.4 pounds


    Engine / Drivetrain
    Battery: 34# (this is a Toyota replacement battery, OE Mitsu may be slightly different)
    Transmission (including upper trans mount and bracket): 73#
    Engine (all accessories removed, no manifolds, fuel rail or coil packs): 112#
    Intake Manifold & Fuel Rail: 7#
    AC Compressor: 9#
    Alternator: 10.5#
    Flywheel: 15.1#
    Pressure Plate: 6.0#
    Clutch Disk: 1.6#
    Crankshaft Pulley/Damper: 2.8#
    Exhaust Manifold Assy w/ Pre-Cat = 9.9 lbs
    Exhaust from Pre-Cat Back (including 2nd Cat) = 18.5 lbs
    SuperCircuit Header = 5.5 lbs
    Battery Tray: 2.8 pounds (shelf, plastic tray and tie-down)
    Stock wheels/tires: 25.4 pounds
    Stock 165/65-15 Enasave Tire: 13 pounds (from Tire Rack)


    Simplify and add lightness.

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    Senior Member 01-7700's Avatar
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    what are corner weights - one tire at a time? how is this accomplished? one scale moved around or four scales? is it normal for them to be that far off from each other?
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        click to view fuel log View my fuel log 2014 Mirage 1.2 manual: 37.9 mpg (US) ... 16.1 km/L ... 6.2 L/100 km ... 45.6 mpg (Imp)


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    Still Plays With Cars Loren's Avatar
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    Quote Originally Posted by 01-7700 View Post
    what are corner weights - one tire at a time? how is this accomplished? one scale moved around or four scales? is it normal for them to be that far off from each other?
    Corner weights are usually done with a special set of scales. I have a friend who owns a set. Yes, you measure each corner of the car on a level surface.

    It's a "race car" thing. Ideally, you want the weights WITH the driver in the car, to be either equal (if it was a perfectly balanced sports car), or at least have diagonal weights that are equal so that the car will corner more the same in each direction rather than a little better one way vs. the other. It also keeps the car from getting "wonky" when transitioning to acceleration or braking. If your diagonal weights are off by a lot, the car is going to teeter like a table with uneven legs.

    FWD cars are always heavier in the front. 60-65% front, the rest in the back. Left and right could be better balanced, but it's an economy car and that's not a huge design priority. I'm guessing this car was primarily designed for Right-Hand-Drive market, so the (very heavy) battery is on the left, and that makes it a bit more left-heavy in the LHD version. (edit: actually, it's NOT left-heavy. I expected it to be. I wonder if that's why they spec'd such a freakin' heavy battery?)

    I just included it because I had it, and figured some people might be interested.
    Last edited by Loren; 11-01-2018 at 04:47 PM.
    Simplify and add lightness.

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    Senior Member 01-7700's Avatar
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    yes, it is interesting to me - never even suspected this was a thing
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        click to view fuel log View my fuel log 2014 Mirage 1.2 manual: 37.9 mpg (US) ... 16.1 km/L ... 6.2 L/100 km ... 45.6 mpg (Imp)


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    I've stickied this thread. Nice job starting this Loren. We can do the upkeep on the first post.
    Custom Mirage products: Cruise control kit, Glove box light, MAF sensor housing, Rear sway bar, Upper grill block

    Current project: DIY Nitrous oxide setup for ~$100

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage DE 1.2 manual: 45.4 mpg (US) ... 19.3 km/L ... 5.2 L/100 km ... 54.6 mpg (Imp)


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    Still Plays With Cars Loren's Avatar
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    Quote Originally Posted by 01-7700 View Post
    yes, it is interesting to me - never even suspected this was a thing
    Oh yeah. It's all part of the "black art" of suspension tuning. It's a very, very deep rabbit hole to go down.

    I'm sure I looked at this when we initially weighed the car last September, but I had forgotten. So, the corner weights are Front: 573/648, Rear: 362/474. That means the cross-weights are 1047 and 1010. That's really not bad at all! Of course, these weights were taken without the driver in the car. I really just wanted to get a base weight for the car to know where I started.
    Simplify and add lightness.

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    Senior Member 01-7700's Avatar
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    are there any surprising results as to how a driver's weight distributes to the corners or is it all levers and fulcrums?
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        click to view fuel log View my fuel log 2014 Mirage 1.2 manual: 37.9 mpg (US) ... 16.1 km/L ... 6.2 L/100 km ... 45.6 mpg (Imp)


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    Still Plays With Cars Loren's Avatar
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    It's all black magic.

    How the driver's weight contributes to each corner would include factors such as exactly where the driver's seat is located, distribution of the rest of the weight in the car, the suspension geometry, the spring rates on each corner, swaybar rates, to some extent even the inflation of the tires. The only way to get it right is to test it and adjust it with the driver in the car.

    It all gets very complicated, but it's fun to play with.
    Simplify and add lightness.

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    Still Plays With Cars Loren's Avatar
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    I bought the parts needed to upgrade my 2015 to 2017 front brakes. I have the rear upgrade, as well, but that's a project for another day... and I may not even bother doing it.

    Here are the measurements taken with a kitchen scale (very precise):

    2015 Front Rotor - 7.55 pounds - 229mm (9") OD
    2015 Caliper Bracket - 1.22 pounds
    2017 Front Rotor - 9.12 pounds - 251mm (9.9" OD)
    2017 Caliper Bracket - 1.45 pounds

    So the the total difference is 1.8 pounds of unsprung weight. 1.57 pounds is rotational weight. (boooo!)

    The rest of the brake parts are the same 2015 or 2017:

    Brake Pads, one wheel (barely worn at 20k miles) - 0.91 pounds
    Brake Caliper - 4.38 pounds
    Caliper Pins - 0.26 pounds
    Brake Hose - 0.35 pounds
    Simplify and add lightness.

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    Love these weight threads! Thanks for starting it, Loren.


        __________________________________________

        click to view fuel log View my fuel log 2014 Mirage base ES 1.2 manual: 54.0 mpg (US) ... 23.0 km/L ... 4.4 L/100 km ... 64.9 mpg (Imp)


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