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Old 18th April 2005, 01:37   #1
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Default help reg gear ratios

hi ..
i was wondering if someone could tell me about the gear ratios and the shift points . how are they tweakd ?
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Old 18th April 2005, 01:59   #2
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http://www.howstuffworks.com/gears.htm

the link above should tell u everything about gear ratios .

shifitng point is different for each engine .. redlining the car each time does not give you a good run ... engine power curves down after a certain engine speed ...so look to shift by 85 - 90% of the tacho..
but it all depends run your car a few times .. too see what is the ideal shifting point ..

cheers
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Old 18th April 2005, 10:08   #3
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you just want to know more about gear ratios?
well basically they are worked on in tandem with the engine thereby giving you faster initial and maintain the power throughout the revs at maximum.

Last edited by iceman91 : 18th April 2005 at 10:10.
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Old 18th April 2005, 10:14   #4
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ah man gear ratios , not again. we had this design class in Engg, we calculated 3 page formula for opti gear ratios. Big head ache, any way cleared the exam in my first attempt so dont know much abt it
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Old 18th April 2005, 15:07   #5
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well by what i know, it is not necessary to develop gear ratios for a better initial speed ... we can have ratios to give just top end speed also!! .... By the way does any Bhpian have a closed ratio gear box or a Sequential Box on their cars????
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Old 18th April 2005, 16:53   #6
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closed ratio gearbox...had it on both the cars. teh e-zen as well as have it on the baleno
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Old 18th April 2005, 17:19   #7
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Quote:
Originally Posted by iceman91
closed ratio gearbox...had it on both the cars. teh e-zen as well as have it on the baleno
dude wanted to install one on my Vtec, any idea as to how much it will cost and from where i can get it??? And yeah, any drawbacks after installing da box???
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Old 18th April 2005, 17:31   #8
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as the name "close-ratio"suggests,the gearing will be short ,such that the revvs stay in the power band range throughout in all gears.
but i think the top speed will be reduced.
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Old 18th April 2005, 19:44   #9
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so is it like if you have close ratios the top speed goes down and the accelration is better.how much does the entire setup cost's.i dont think it would be suitable for a car which is used regularly...is it only meant for racing purpose ?
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Old 18th April 2005, 20:00   #10
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Quote:
Originally Posted by freakr
so is it like if you have close ratios the top speed goes down and the accelration is better.how much does the entire setup cost's.i dont think it would be suitable for a car which is used regularly...is it only meant for racing purpose ?
yeah ..close ratio is a performance setup .. the car is constantly in its powerband ...its a headache driving in city conditions ,mileage suffers aswell ..
but the fact that ur feeling that pull each time shift up is thrilling enough..my friend has a mazda MX6 .. came stock with a close ratio ... and a performance muffler .. feels great .. but sometimes it does get tiring the shift interval are short in the city you'll end up driving with one hand on the shifter all the time ..
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Old 18th April 2005, 22:29   #11
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yeah the top end will drop a little bit..... but then the acceleration is just too fabulous...! Infact ideally i would love to fit in a sequential box, but it will proabably cost me about 5-6 lacs! Will team-Bhp be interested in sponsering me???
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Old 18th April 2005, 22:46   #12
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Quote:
Will team-Bhp be interested in sponsering me???
old habits die hard
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Old 18th April 2005, 22:49   #13
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Quote:
Originally Posted by adilshah
old habits die hard

hahaha, adil dude.... actually i am still waiting to get sponsered from somewhere, somehow....!!
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Old 18th April 2005, 22:53   #14
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well its good you keep trying. you will get lucky some time or the other.
i dont think a sequential is so expensive. are you sure dude.
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Old 18th April 2005, 23:03   #15
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yeah adil, infact vickey was planning to put a sequential box on the new formula car with esteem engine, and it was costing about 5lacs! It bloody costs more then the car itself !! Infact one of the JKtyres Rally car (Group A) had a sequential box i was told...! hehehhe and guess what???? Mr. Anmol breaks the Box....when he was driving on the streets of delhi!! hehehe
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