Gears Vs.Revs

Fomoco98 · Sep 21, 2005

Check my math here. I am going to change out a 2.73 to a 3.73 and this is the rpm jump I came up with .The tire I run will turn 786 revs in a mile. It takes 1 more turn of the drive shaft to make the tire go round 1 time so the way I see it I will be turning 786 more RPM at 60 MPH. i dont know if I'm even in the ball park here so dont laugh too hard.

csledd · Sep 21, 2005

how many rpms are you turning at 60 mph with 2.73's?

Fomoco98 · Sep 21, 2005

1400 In OD

wilsonc2222 · Sep 22, 2005

Fomoco98 said:
Check my math here. I am going to change out a 2.73 to a 3.73 and this is the rpm jump I came up with .The tire I run will turn 786 revs in a mile. It takes 1 more turn of the drive shaft to make the tire go round 1 time so the way I see it I will be turning 786 more RPM at 60 MPH. i dont know if I'm even in the ball park here so dont laugh too hard.

jesus man, you have way too much time on your hands.install those 3.73
gears and enjoy. dont worry about how many more turns you make.

Pearl02 · Sep 22, 2005

Going from 2.73 to 3.73 is about a 27% increase in rpms. At 60 you'll turn around 1778rpm's(1400x27%=378+1400=1778) Pearl02.

03ghoststang · Sep 22, 2005

just throw on those 3.73's and have fun at 60 you might be turning close to 2000 rpm's but it'll get the car quicker to its rpm band

Rocketman · Sep 22, 2005

Go with 4.10's

Here's the numbers I have with 4.10's

forpit2000gt · Sep 22, 2005

what engine is in the car and who said you had 2.73 gears to begin with?

Gearbanger 101 · Sep 22, 2005

Math sucks, let this calculator do it for you.

http://www.allfordmustangs.com/Detailed/608.shtml

DCjuggalo · Sep 22, 2005

Rocketman said:
Go with 4.10's

Here's the numbers I have with 4.10's

damn, you get bad gas mileage?
the higher the RPM the more gas it uses am i correct..

mogs01gt · Sep 22, 2005

city driving plays more of a negative effect on gas mileage more than high driving.

Stang|ess · Sep 22, 2005

I did not make these, I just saved the pictures. Someone else from here made them so props to him

forpit2000gt · Sep 22, 2005

there are 600 threads on gears and what is my rpm with 4.10s and I 'm scared to go with 4.10s should I do 3.90s? If you do one search, all can be answered.

Fomoco98 · Sep 22, 2005

You guy's are right 4.10 it is . I'm not buildin an eco car .BTW I built up and put in a mark VIII 32V in my 98 V6 stang and the tag on the rear says 2.73.

forpit2000gt · Sep 23, 2005

98 v6 rearend is 7.5. not 8.8.

Gearbanger 101 · Sep 23, 2005

forpit2000gt said:
98 v6 rearend is 7.5. not 8.8.

This is true. Almost forgot that point for a moment.

I found this a while back for a nice reference if anyone is interested….

http://www.dariusrudis.com/mustang/must98/must98a.htm

ponysarepretty · Sep 23, 2005

DCjuggalo said:
damn, you get bad gas mileage?
the higher the RPM the more gas it uses am i correct..

No more so than lugging the engine at low RPMS.

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