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2004.12.26

4Motion on Snow

どちらかといえば「アスファルトを蹴飛ばす」こと、
もしくは「高出力を配分すること」に重点が置かれがちな
いわゆる「スポーツ4WD(AWD)」にR32の4Motionは分類されちゃうけど、
もともと4WDは氷結路・悪路のための技術だったりする。
もちろん、普段の「鬼のような高速安定性」や
「コーナリング挙動の安定化」に寄与してるのは体感済みだけど。

肝心の4WDとしてのBadCondition耐性、いかほどか。
さて、スタッドレスも履いてることだし、どんな感じだろう??

実は、機会があれば使用する私的テストルートがある。
R120:冬季閉鎖区間
今年は明日から閉鎖。というわけでラストチャンスに出かけた。

まず。
samui
寒い・・・・寒すぎ。
氷結警告の雪印なんてとっくに消えて、ただのマイナス表示。
#ちなみにココまで結構ガンガン走ってくるのに、燃費いいよ!

で、今年は雪が少ないので少しダルなコンディション。
でもココまで来ればほれ、立派に積雪・圧雪・凍結路。
in-snow
実はこの辺、地元ス○ル車の天下、周りはWRXばっかりだー(^^;;

で、上がったり降りたり曲がったり。
途中で雪壁に刺さってしまった軽自動車救出したり。
#FFで前から刺さると出れなくなるよ、ホントに。

で、無事に降りてきました。
in-marunuma
さあて、関東でのホームゲレンデ、
今年は何回来られるかなー??

さて、肝心の4Motion+スタッドレスの挙動。
「あ、来るくる」と思うと、即座に駆動配分が行く。
気づくとパーシャルのまんま、すんなり曲がる。
この、来る間の感覚がものすごく鋭敏かつ素早いので
結構緻密に制御されてますね、オンデマンドとは思えぬ。

知ってる他の4WDともちょっと雰囲気が違う。

WRXとかは「凍ってたんだっけ?」って思うほどのトラクションと
いざパワーをかけた際も滑りながらも曲がっていく。
やっぱラリーベースのフルタイム直結配分のなせる業か。

昔乗ってたU12-ATESSA(LSD付)は、
凝った電子制御も何にもない代わり、
「来てるねー来てるよ」を感じながらスルスルヌルヌルと破綻なく
コーナーも路肩凍結も越えていった。ビスカスのユルい動作も
変に意識させない挙動として、それは正解だと思う。
単純メカニカルでも十分に構築できる好例。
Audiのquattroもトルセンデフのメカ主体に戻ったしね。

さて、こんなこと、伊達酔狂でやっているのでもない。
雪道経験者としちゃぁ、そういうConditionで
そのクルマの真価が露見すると思ってるのだ、今でも。

あれだけの大きなエンジン、アスファルト上でアクセル踏めば、
大体がパワーどおりの速度は出る。
とんでもなく踏み込まなければ、まあ、あんなサイズのタイヤ、
滑らせてとっ散らかるほうが大変だ。

ただ、BadConditionでは自分の挙動(ドライビングスタイル)も
数倍に増幅されて帰ってくる。
ステア切り過ぎてないか、ペダル雑に踏んでないか、
なにもサーキットの限界走行で必要なスキルではない。
普段を乗り切るための、クルマと自分を確認するのだ。

そういえば・・・
前のクルマ(FF)でもやってたのよ。ほぼ同じテスト。
G3_snow_akagi
この時はサイド引いてみて回避動作を試した後なので、
リア周りが大変に雪まみれでっす(^^;;

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Comments

ご無沙汰です。
もうそんな時期ですか。今年も行ったんですね。
丸沼までの道が拡幅されたとかそういう話があるらしいんですが、変わってました?

Posted by: Tak | 2004.12.27 02:49 PM

おおぅっ,もうこんな積雪が。
もうお分かりだと思いますが,四駆は加速性能良い
ですが,ブレーキ性能一緒なので(もしくは重い分
不利)なので,お気を付けあそばせ。
でも雪道,楽しいんだよね~。
MR+スタッドレスだとどうなのかな?
ま,登りは勝負にならんな。

Posted by: Kim | 2004.12.27 03:29 PM

 こんにちはぁ。まだスタッドレス買っていないので、未体験ゾーン・・・私は一昨年の11月に金精道路を奥日光からバイクで抜けようとして途中積雪に出くわし、また宇都宮まで戻ったと言うことがあります。

 さて、私もみんなに言うのですが、「四輪駆動」なんですよね。四輪制動でも四輪操舵でもない。
 あくまで駆動しかしないのですから、走るは出来ても、曲がる、止まるは四駆でないのと変わらないのよね。それを忘れちゃっている人、結構多いのも事実。確かに駆動を操舵として利用するなら、四駆は曲がるけどね。

 いろいろ考えていますね、るし氏。

Posted by: 1.8T | 2004.12.27 09:17 PM

ほれ、
言ってる端から雪降った・・・。

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