Rearend???

suprasforlife · 08-25-2006, 07:54 AM

Quote:

Originally Posted by grygst76

at 70 I am at 2100 rpms in 5th. 75 I think 2850

I've got 3.9 gears in mine and at 75 I'm at 2850 there about so I'd say you got 3.9 gears.

Supra2NR · 08-25-2006, 08:11 AM

maybe i can help

Quote:

could someone explain this too me. why, in the same gear and at the same speed, do "low" gears have higher rpms, and "high" gears have lower rpms?

lower gears have small circumferences that allows them to do a complete 360
faster
while the higher gears have a bigger circumference, hence a longer rotation

bcuz the lower gears needs to rotate more to produce the same amount of power as the higher gear does
the higher gears puts out enough power so it does not need to rotate any faster
rpm = rotation per minute

im not making you sound stupid,
but look at it this way
you got the lower gears as a , small guy , really quick but no muscle
then you got the higher gears, big guy, muscular, but no speed

to push a 3600 lbs object
the smaller guy needs to work more harder than the muscular guy

i did my best to explain that, may not have the proper terms but, i think it works,
if not, oh well i gave it my best shot
hopefully it helps

h8z2luze · 08-26-2006, 01:50 AM

I found mine, its G285

h8z2luze · 08-26-2006, 07:05 PM

So would that mean that the rearend has 4.30 gears like 4.11's? Cause that would be really low.

suprasforlife · 08-27-2006, 02:22 AM

Yup, you got some the lowest ones there is, great for in town and racing, shitty for the highway.

damdog05 · 08-30-2006, 02:32 AM

thanks for the explination. ive got it all worked out in my head now.

Isphius · 09-02-2006, 06:23 AM

High gears are called high, And have high rpms, Because of the numeric gear ratio. All for example, First, being a high gear, is say, a 3:1 ratio. Meaning the drive gear spins 3 times(high rpms, more mechanical advantage) for one rotation of the driven. At 5th, The ratio is say 1:1, a low gear. The drive and driven spin the same. Which is less rpms and less mechanical advantage as opposed to 3:1. And overdrive means that the ratio is less than one. .75:1 for example. And supra2nr, For your explanation, A smaller guy running faster and a stronger guy running slower pulling the same weight, Are doing the same ammount of work, But one faster and one with more force. That is the important part.

08-26-2006, 01:50 AM	#3
h8z2luze 12psi boost Join Date: May 2006 Location: Nor*Cal Posts: 338	I found mine, its G285 __________________ 1989 Supra 7MGE MK3 5-speed project... http://www.cardomain.com/ride/2385505

08-26-2006, 07:05 PM	#4
h8z2luze 12psi boost Join Date: May 2006 Location: Nor*Cal Posts: 338	So would that mean that the rearend has 4.30 gears like 4.11's? Cause that would be really low. __________________ 1989 Supra 7MGE MK3 5-speed project... http://www.cardomain.com/ride/2385505

08-30-2006, 02:32 AM	#6
damdog05 12psi boost Join Date: Apr 2006 Location: Georgia Posts: 250	thanks for the explination. ive got it all worked out in my head now. __________________ My cars: 85 Trans Am- Ehhh- Gone 83 Rx7- Much Better- Gone 86.5 Supra- Love- Not Gone

09-02-2006, 06:23 AM	#7
Isphius 500whp yet? Join Date: Nov 2005 Location: Long branch, NJ Posts: 1,006	High gears are called high, And have high rpms, Because of the numeric gear ratio. All for example, First, being a high gear, is say, a 3:1 ratio. Meaning the drive gear spins 3 times(high rpms, more mechanical advantage) for one rotation of the driven. At 5th, The ratio is say 1:1, a low gear. The drive and driven spin the same. Which is less rpms and less mechanical advantage as opposed to 3:1. And overdrive means that the ratio is less than one. .75:1 for example. And supra2nr, For your explanation, A smaller guy running faster and a stronger guy running slower pulling the same weight, Are doing the same ammount of work, But one faster and one with more force. That is the important part. __________________ Yay the supra assistant is gone!!! WEEE!! Last edited by Isphius; 09-02-2006 at 06:26 AM.

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