Choosing gear ratio.

[re-rx7]

As it sits right now I have 3:31's but with the upgraded 20's It has fallen some. Judging by the Tire size calculator Im ruunng somehwere around 3:19's or so. I originally wanted 3:55's so with this difference Im gonna go 3:73's and hopeflly my ratio will end up somewhere in the 3:60's.

Any input on this? Im also buying OEM Ford gears and not Ford Racing as they are made by a different company. I can get gears and bearing brand new from dealer for $152.00.

[03MachMe]

Depends on your goal for the car. strip? autox? road race? roll race? I have 3.31 but with the shorter tires I will be running with my track wheels it ups my gear ratio right where I want it so I will likely not change mine.

[re-rx7]

Depends on your goal for the car. strip? autox? road race? roll race? I have 3.31 but with the shorter tires I will be running with my track wheels it ups my gear ratio right where I want it so I will likely not change mine.

Mexico mostly with very little Drag time. 3:19 is extrememly high and i hate it.

[03MachMe]

Mexico mostly with very little Drag time. 3:19 is extrememly high and i hate it.

then I would go with 3.73 if you plan to keep those wheels

[re-rx7]

then I would go with 3.73 if you plan to keep those wheels

I do for the forseeable future. Car takes awhile to climb the RPM band now. Its noticable.

[Darkhelmet22]

4.10s!

[re-rx7]

Jesus Christ!!!

[Darkhelmet22]

Jesus Christ!!!

No that's 4.30s. LOL

[re-rx7]

No that's 4.30s. LOL

LOL I think 3:73 is more then enough.

[Darkhelmet22]

LOL I think 3:73 is more then enough.

I had 4.10s in my 5spd GT and they were awesome.

[rlhay2]

If your long term plans include a turbo(s), keep the 3.31s.
Otherwise, 3.73 is a good street, strip, 1/4 choice.

[re-rx7]

If your long term plans include a turbo(s), keep the 3.31s.
Otherwise, 3.73 is a good street, strip, 1/4 choice.

No F/I. Maybe juice later on but mostly motor.

[Futwa]

I'm in the same boat as you with 20's and 3.31's and yea....it take a while to climb. I'll be getting 3.73's here in the next month or two. If I get mine done before you I'll let you know how it is.

[DirtyD]

I'm in the same boat as you with 20's and 3.31's and yea....it take a while to climb. I'll be getting 3.73's here in the next month or two. If I get mine done before you I'll let you know how it is.

Just add boost, that will help it climb faster. Lol

[DirtyD]

I had 4.10s in my 5spd GT and they were awesome.

That 3650 also had much different gear ratios.

[03MachMe]

That 3650 also had much different gear ratios.

Yep I had 4.10 in my Mach and they were perfect but would be way too much gear in a 5.0 unless all you care about is 1/8th mile race

[Dominic Toretto]

My car has a 3.15 rear end. Came with the gay 18s with 235/45/18s. I am lowered an inch with 285/35/19s, anyone know how that would effect my gear ratio?

-Alex

[my95z28]

Really good tire size calculator at this website. http://www.miata.net/garage/tirecalc.html

Gives you a visual of how the tires are sized differently, and a percentage of how far off your tires are. Yours are only 2%, so not that big of a drifference. You'll actually be going 2% faster than what your speedometer says, but thats such a small difference it will never matter.

[DirtyD]

Alex, it's probably now around a 3.13-3.14 effective ratio.

[Dominic Toretto]

Ah thanks guys. I didn't think the change was too drastic. I noticed my speedo hasn't changed at all.

-Alex

[DirtyD]

Ah thanks guys. I didn't think the change was too drastic. I noticed my speedo hasn't changed at all.

-Alex


Are your new wheels slightly shorter or taller than the old wheels?

If shorter, it's a slightly shorter effective ratio. If taller, it's a slightly taller effective ratio.

[Dominic Toretto]

Are your new wheels slightly shorter or taller than the old wheels?

If shorter, it's a slightly shorter effective ratio. If taller, it's a slightly taller effective ratio.

Posted this above.

My car has a 3.15 rear end. Came with the gay 18s with 235/45/18s. I am lowered an inch with 285/35/19s, anyone know how that would effect my gear ratio?

-Alex

[Bacadiesel]

http://www.tacomaworld.com/forum/tirecalc.php

I like this tire calculator cuz it shows pics

[Bacadiesel]

Alex , your new wheel and tire combo is 0.53 inches taller

[Darkhelmet22]

That 3650 also had much different gear ratios.

No mine was a T45 :party36:

[DirtyD]

Posted this above.


Missed that. I didn't realize the 18s came with such short tires.

[Dominic Toretto]

Missed that. I didn't realize the 18s came with such short tires.

Haha, thanks for second guessing, I had to check again. They were 235/50/18s stock.

-Alex

[DirtyD]

Haha, thanks for second guessing, I had to check again. They were 235/50/18s stock.



-Alex


That's what I was thinking. These cars come with at least 27" wheel/tire combos.

Your rear wheel is now about 1/4" shorter than stock, so your effective ratio when a little shorter to probably a 3.16. Lol

[Dominic Toretto]

That's what I was thinking. These cars come with at least 27" wheel/tire combos.

Your rear wheel is now about 1/4" shorter than stock, so your effective ratio when a little shorter to probably a 3.16. Lol

So now I should run 9s all day!

-Alex

[re-rx7]

So now I should run 9s all day!

-Alex
This.:mexsmoke:

[Dan12GT]

Oh ya I went from 27.68 on stock 19s to 27.58 with the 20s on a slightly shorter tire. Heck ya I'm running like 3:31.5s now! On a serious note I'm definitely looking at doing 3:73s