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11-11-2010, 01:33 PM | #37 |
resident senior
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Tom: for track and autox I take out the rear "junk" so that I can utilize oversteer . In the mountains I leave everything in so that I can utilize understeer . I don't want my tail to be in the opposing lane !
Jason: First of all , I really admire what you have done with the Yaris But it is really unfair to compare your fully track prepped Yaris with a street driven Yaris . I mean your Yaris looks like it has the correct weight reduction measures ( in all 3 planes ) . I mean really , those Goodyear ( which have extra stiff sidewalls BTW )slicks are enough to keep any vehicle from tipping over Not to mention I feel you have a custom suspension among other things . Try this , put your stock Goodyears on and put your glass back in or up ( not sure if you removed/replaced your glass ) . I feel certain that the stock tires will roll onto the sidewall then the wheels will dig in to the tarmac , then loopedy loop , you will make some body shop happy Light is might . That is correct to a point . To the point that safety is compromised . The OP doesn't have a roll cage to stiffen the Yaris up after the reduction in weight . Nor does he have 10.5" slicks with a custom suspension . Nor does he have the driving experience(Yaris) in a panic/performance situation like Jason does . In no way am I saying that weight reduction shouldn't be done . I'm just trying to point out the potential pitfalls . Another pitfall I forgot to mention is that the Yaris will be more likely to hydroplane with weight reduction . I can't speak for anybody else , but I would not want to be hydroplaning on the downside of a 12% grade Not saying that will happen , but the potential will be increased with weight reduction .
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11-11-2010, 02:35 PM | #38 | |
Drives: 2015 H Production Yaris Join Date: Oct 2009
Location: Debary, FL
Posts: 1,953
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Quote:
Less weight builds traction, as the tires are not have to work as hard to hold the weight up. More weight on a tire does not make it work more efficiently. At the initial moment of inertia the extra grip will help to prevent wheel spin, but once the car has moved even a fraction of an inch the weight is hurting efficiency. Worrying about the effect of the trivial amount of weight you could remove and keep the car civilized for the street is a waste of energy. If you want to use a hydroplaning example keep in mind that the inertia of the heavier car will carry it longer than the lighter car, and it will take longer to recover. You want to prevent hydroplaning, use a better tire. Manufacturers are going to alternative lightweight materials for a many reasons... It helps fuel economy for one. Another is safety. Look at the numbers, a full size van does not fair better than a lightweight compact when it comes to occupant safety. No one should be suggesting removal of any safety equipment, or any devices that compromise the structure of the car, but there are things that can be removed without a dangerous downside.
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2005-2008 SCCA Solo BS National Champion 2017-2018 SCCA H Prod National Champion |
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11-11-2010, 11:34 PM | #39 | ||
Only Happy When it Rains
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Quote:
It would be different if i wanted to add power, but i really just want to add lightness. Quote:
You should note that the one known Yaris that tipped at an autocross had a stock suspension and some of the stickiest tires you can buy for the street. And then re-read what Jason wrote.
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Colin Chapman disciple Last edited by why?; 11-12-2010 at 12:07 AM. |
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11-12-2010, 02:06 PM | #40 |
Drives: 07 Yaris Sdn, 97 4Runner Join Date: Jul 2006
Location: Upland, CA
Posts: 113
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What are getting for fuel mileage with all of the weight reduction? Pencil and paper calcuations only, Scan Gauge numbers do not count!
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11-12-2010, 08:51 PM | #41 |
Only Happy When it Rains
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so accuracy doesn't matter? lol.
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Colin Chapman disciple |
11-12-2010, 09:46 PM | #42 |
Drives: 2007 Yaris Hatchback Join Date: Jul 2007
Location: Beaufort, South Carolina
Posts: 388
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I think as tempting as it is to lighten the rear, I personally would prefer to do this only if I planned to tweak the suspension a bit. having an even heavier front end seems silly without tuning the car further.
I do think lightening the front needs less tuning overall, and has an even more drastic impact. anyways, you can always add your notes to this thread: http://yarisworld.com/forums/showthread.php?t=17526 I was hoping we could get more of these calculations on the forums :) |
11-12-2010, 10:54 PM | #43 | |
Drives: 2008 5 sp. LB Join Date: Oct 2010
Location: Idahoi
Posts: 268
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Quote:
Having to pull a 1,000' grade every day to get home, for me anyway it makes sense and just feels right to not haul any dead weight up with me. I also like not having it with me when going down, it is a win/win. If all I did was level driving I wouldn't be quite so anal about it. I even made a point of getting a small dog, 20 lbs, and keep him on a strict diet. Sure, people tell me all the time "that dog looks like he's starving", but every little bit helps. Making him run uphill helps keep the weight down also. Last edited by Idahotom; 11-13-2010 at 10:12 AM. |
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11-13-2010, 09:01 PM | #44 |
Drives: 2007 Yaris Hatchback Join Date: Jul 2007
Location: Beaufort, South Carolina
Posts: 388
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11-16-2010, 12:17 PM | #45 |
Don't forget about your own diet. ;) It's not fair to the dog. :(
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04-05-2011, 12:49 PM | #46 |
Drives: 08 Sedan & 11 5-door Join Date: Sep 2010
Location: Socal
Posts: 16
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04-05-2011, 02:36 PM | #47 |
advocatus diaboli
Drives: 07 Yaris hatch Join Date: Mar 2011
Location: San Jacinto California
Posts: 1,126
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don't forget to remove the headliner, and depending on your local codes you might only need one side mirror...I'm just sayin. ;)
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04-07-2011, 01:34 AM | #48 |
Drives: 08 Sedan & 11 5-door Join Date: Sep 2010
Location: Socal
Posts: 16
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Haha thats my other car no joke. :)
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