4:10 gears

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01-21-2006, 01:36 PM

#51

Birdieman4

5th Gear Member

Join Date: Oct 2003

Location:

Posts: 3,020

RE: 4:10 gears

Quote:

WTF???

Who would keep the same aspect ratio when plus sizing?
That is just silly (and not what you said ) and it will also cause your speedometer
to be off, in some vehicles can cause your shift points and transmission fluid pressures to change

Like I said, any change in tire diameter will have an effect, wheel size don't have a thing to do with it...

How are you going to aruge with PROFESSIONAL DRAG RACER? He knows what he's talking about and it makes perfect sense.

I'm comparing apples to apples in tire charateristics. That's all. And we're not arguing here, we're discussing.

01-21-2006, 01:57 PM

#52

Blue70

2nd Gear Member

Join Date: Oct 2004

Location:

Posts: 485

RE: 4:10 gears

Quote:

ORIGINAL: Birdieman4

Quote:

I'm comparing apples to apples in tire charateristics. That's all. And we're not arguing here, we're discussing.

Yup
No arguement here, I just feel thet it's common knowledge that when plus sizing you must adjust your aspect ratio to compensate for the increase in wheel diameter.
Like I said, not doing so can have greater consequences then just a change in effective gear ratio because the average person will not feel the difference going to a 1" taller tire..
It is used more in the 4x4 world where people change the tire diameter buy a lot more than an inch.

But since you brought it up.....

Lets use a stock mustang 245/45/17 and say that someone decides to use a 245/45/18

OldTireDiameter = 25.68 inch
NewTireDiameter = 26.68 inch
GearRatio = 4.10

New Tires
effective gear ratio = 3.9463268365817

and if you had 4.10's in a 01.5 - 04 Mustang with the 3650 with 25.68" tall tires
at 70 MPH in 5th gear, your motor is turning at 2,329.1 RPM

and if you had 4.10's in a 01.5 - 04 Mustang with the 3650 with 26.68" tall tires
at 70 MPH in 5th gear, your motor is turning at 2,241.8 RPM

only a difference of 87 RPMs

Heck if you lose 1/4" of tread over the life of your tire, that is 1/2" off of the tire diameter...Do you feel that? You're not going to feel double that either

No one will notice [&:]

01-21-2006, 02:35 PM

#53

GSXRIntensity

4th Gear Member

Join Date: May 2003

Location: Chi-town!!!

Posts: 1,205

RE: 4:10 gears

Quote:

ORIGINAL: czwalga00gt
...And no it pulls nothing like 4th with stock gears, i've tested it.

It does not pull as hard has 4th w/3.27's, but 4.10's sure as hell will allow you to make better use out of it. I agree with you that it doesn't pull that hard, but 5th in a 3.27 is such a pig that the f*cker barely accelerates when you floor it. With the 4.10 you can actually move foward with 5th. Maybe there's not difference in an otherwise stock car, but with mine I can make use of 5th & 4.10's are perfect for a daily driver Mustang

01-21-2006, 02:40 PM

#54

GSXRIntensity

4th Gear Member

Join Date: May 2003

Location: Chi-town!!!

Posts: 1,205

RE: 4:10 gears

Quote:

ORIGINAL: pj1010
[That doesn't even work out on paper...your sense of pull is must be screwed.

lol...I don't need any paper to work out a solution. I'm talking SOP feeling in the actual car. My Mustang is highly modified though, so that is probably what makes me use 5th gear a lot more than someone with just exhaust and a clutch.