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Tuesday, January 21, 2014

Gear Shifting for Economical Driving

For vehicle with manual transmission, there is an opinion stating that upshift gear should be done when the engine produces maximum torque. For example, if vehicle engine produces maximum torque at 3500 RPM, then upshifting gear from 1^st to 2^nd, from 2^nd to 3^rd, from 3^rd to 4^th, and so on, is made when engine speed reaches 3500 RPM.

If you follow that rule, it means that when driving a vehicle with maximum torque at high engine speed about 6100 RPM like BMW E60 M5, then any upshift should be done after reaching engine speed arround 6100 RPM, which is very-very high for use in the city.

I checked to vehicle manual book, but there is no explanation to constantly change gears when engine speed produces maximum torque. So, when the best time to change gears?

For economical driving, always try to keep engine speed as low as possible, but not too low to make the engine lack of torque and transmission vibrates. So, what is needed is sufficient torque for particular load and speed, not the maximum torque. This will vary for each vehicle and can be felt by an experienced driver.

For more details about the torque can be read on The relationship between Power, Torque, RPM.

The use of a tachometer can help to determine when the best time to change gears. More details about the tachometer can be read in the article What is Tachometer Function on Vehicle.

Some vehicles have engines capable of generating a large torque at low engine speed such as jeep, truck and bus, gear upshif can be done at engine speed as low as 1200 to 1500 RPM. For sedan, gear upshift can be done at engine speed 2000-3000 RPM for economical use. If going up hill or pulling heavy loads then gear shifting must be done at a higher engine speed, up to 4000 RPM. See Fuel economy-maximizing behaviors in wikipedia.

Some luxury sedan like the Rolls-Royce Phantom, designed with the engine capable of generating a large torque at low engine speed. Rolls-Royce Phantom engine produces maximum torque of 720 Nm at 3500 RPM engine rotation, and 75% of maximum torque is obtained at engine speed as low as 1000 RPM. The goal is to make it easier to accelerate without the need to press throttle pedal deeply and without the need to shift to lower gear (downshift) when going up hill and acceleration. Rolls-Royce named this easy to accelerate as waftability.

On tractor, if it is not pulling heavy load, due to it’s high torque at low engine speed, the driver can start directly with a high gear (3^rd or 4^th gear). Climb with 5^thgear is not a hard thing for the tractor. Shown in the photo below the tachometer of tractor with speed for each gears for a particular engine speed.

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Friday, October 18, 2013

Plume Premium for Twitter v4 11

Plume adalah aplikasi Twitter yang indah dan benar-benar disesuaikan yang akan merevolusi cara Anda menggunakan Twitter! Plume adalah salah satu klien Twitter untuk Android terbaik dan memiliki merek Ice Cream Sandwich baru dan antarmuka tablet! Plume sebelumnya dikenal sebagai Touiteur. (Twitter meminta kami mengubah namanya)

Fitur Premium:
- Colorize your timeline/friends from Twitter
- Multiple twitter accounts support
- Scrollable beautiful widgets to display your twitter timeline on your home
- Mute twitter users, word or clients
- Picture preview
- Twitter geotagging
- Swipe scrolling
- Very customizable
- Internal browser
- Autocomplete twitter hashtags and username
- Share photo with Lockerz, Twitter, Twitpic, Plixi, YFrog, Posterous, Mobypicture, MyPict.me
- Bit.ly support for your tweets
- Inline twitter conversation
- Display replies to a tweet
- Display twitter profiles
- Pull to refresh

Perubahan terbaru:
4.11 - 2 Agustus 2012
- Menambahkan opsi untuk mengubah teks Username dan gaya warna;
+ Perbaikan bug;
4.10 - 26 Juli 2012
- Menampilkan URL seperti mereka muncul di situs Twitter;
- Memperbaiki Streaming tidak restart dengan benar;
- Tata letak berubah dari Timeline dan Profil;
- Pengaturan modus AutoExpand;
- Tombol volume bergulir;
- Minor perbaikan bug

Download:
Plume Premium for Twitter v4.11

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Thursday, October 17, 2013

PUZZLE PRISM 1 3 1 for Android

PUZZLE PRISM – There are plenty of Android apps which you must install it on the Android phone or tablet. One of them is PUZZLE PRISM which recently updated to latest version, PUZZLE PRISM 1.3.1. PUZZLE PRISM 1.3.1 could be downloaded from Android Market where the link is available within this post. Meanwhile, below is detail from the app.

PUZZLE PRISM 1.3.1

Features of PUZZLE PRISM 1.3.1 for Android

There are various features that you can discover in PUZZLE PRISM 1.3.1. Here is full features in the app, including extra features in PUZZLE PRISM 1.3.1

The very best puzzle game is upgraded and now available for Android!
PRICE CUT for a limited time!
PUZZLE PRISM---No1 PUZZLE GAME which is highly evaluated by medias and users.
"PUZZLE PRISM" is still increasing its fans!
----------------------
**How to Play
--Flick upside and left/right/ to rotate blocks and down to drop.
1.Use various forms of blocks to fill the gaps between blocks.
2.If you succeed it, the blocks will be exploded.
3.Do it continuously to get large explosion.
-You can play the "PUZZLE PRISM" with very simple keypad.
-All the game modes support a global high score rankings system
----------------------
**Features
Various type of game modes.
Show me your skill and unlock all of these!
STANDARD
Enjoy the game with out any time restriction
TIME ATTACK
Score as high as possible within a restricted time frame in 2 minutes.
DEAD LINE
Difficulty is the highest from the beginning; this one is for advanced players.
EXTRA
You can enjoy the game in a different way in for advanced players
----------------------
**Facts
Ranked 1st in Google Play Japan.
Mater piece of Puzzle game.
----------------------
**User reviews
-This game feels like a PS1 game, and I mean in the best way possible, totally worth the cost!
-PRISM is everything a puzzler for the mobile device should be.
Uncomplicated yet challenging game play, great music, clean and polished design, addictive.
-This is the most addicting puzzle game in the store!!
----------------------
**Media reviews
-Sometimes you just need this sort of classic "go to" game on your device.
One thats fun, plot less, and has long term replayability. Well, here it is.
(Touch Arcade)
Puzzle Prisms graphical bells and whistles gloss over the awkward transition,
but we doubt you’ll ever be as hooked on this as you were on the classic 2D version of Tetris.
(Pocket Gamer)

PUZZLE PRISM

What’s new in PUZZLE PRISM 1.3.1

--------------
Version 1.3.1
Fixed some bugs.
--------------
Version 1.3.0
Supporting high resolution display.
Fixed some bugs.
--------------
Version 1.2.1
Fixed bugs.
--------------
Version 1.2.0
Fixed bugs.
--------------
Version 1.1.1
Bug fixed. The BGM still played in the background when lock the screen and turn the screen back on.
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Version 1.1.0
Fixed bugs.
You can turn pieces upside down now.
--------------

Interested to set up PUZZLE PRISM 1.3.1 into your Android device? Just follow this link to download PUZZLE PRISM 1.3.1 directly to your Android device. You can obtain PUZZLE PRISM 1.3.1 apk too from other websites.

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