3.31 vs 3.73
 

Have any of you guys arena difference when running the 2 cars against each other? I really haven't been able to find much on this. Will the cars run close or will one walk away?

a 3.73 car will reach the power band quicker than a 3.31 car, but if given enough room, the 3.31 car will end up in front because the top speed will be slightly higher from having a taller, longer gear.

also, it depends on if you are trying to go from a dig or a roll. 3.73 might give you traction problems in lower gears with quick acceleration, but would spin the RPMs quicker once traction is had.

Depends on if your talking about from a roll or dig. Equal power would be a drivers race imo

Too slow. :p

33.1 vs 3.73
 

Well yea I know that. The thing I was more gearing to was like in a roll have you guys lined up a 33.1 car and 3.73 car will similar mods?

Ill race a 3.31 car

33.1 vs 3.73
 

Well find some one lol. I need to see the outcome so I can see if I need to pull the 3.31s out of my car before I start modding more!

If u are gonna go boost keep them

33.1 vs 3.73
 

I was think that to. In my supercharge 06 I went from 4.10s back down to 3.55s. I think that gear is probably the best of both worlds for boost and n/a.

If you want to do straight line racing, rather highway or track, and don't plan to go boost, get 3.73s. If you plan to go boost, as Nic (midnight) said, stay 3.31s.

I have 3.31s and will be keeping them because I plan on going TVS down the road.

4.10's FTW!!!!! Plus I got some for sale for 100 bucks with less then 300 miles in them.:driver:

<------3.31's ;)

I suspect you will change those at some point because you will get tired of blowing tire and losing to cars with less power.

33.1 vs 3.73
 

Set it up!! Then post the video. But I'm having a feeling you're boosted or something haha.

33.1s are pretty f'in steep, it'll prob blow tire in every gear and top out around 50 or so.

33.1 vs 3.73
 

Hahahaha yea damn iPhone and rushing.

Steve is stock but nick has about 40hp so wouldn't be a good comparison of just gears. Josh and I will have to solve this at the track sometime

They're not in the car hence why they are for sale.:lewx4:

My car is boosted and runs the 3.73's. If you are going to street/strip race your car and boost it I recommend keeping the 3.31's. It's hard to find traction or react quick enough to the near instant redline when I don't spin.

x2 and a mexico roll. That will be the big tell. I think the 3.73 v 3.31 cars from a roll will be pretty close with the 3.73 getting a hit and keeping the lead. I don't think it'll matter how fast you go I still think the 3.73 car will pull. I got the 3.73's knowing it was going to be a while before I was boosted. And then I'm sure I can find a 3.31 car who'll want to swap if the time comes. Until then I need some new rims and wider meats in the rear

Have you had your car to the track yet? It seems a lot of people running the 3.73's complain about banging the rev limiter before hitting the traps, defintely more so with the cars making more than stock power.

you know that wont happen.......

3.31 vs 3.73
 

So you think a 3.73 car will take the cake at the end of the day? Because at this point I think the in the middle gear (3.55s) may be the way to go. I think similar modded cars a 3.73 would have a hard time taking a 3.55 car. But as of now I'm playing the devils advocate lol.

ok well in that case. derek hurry up with mods and ill race you lol

ill still say 373s are a prime gear for a bolt on car

Nope, haven't even really played with launching the car. One of these years Ill take her out and see how she does on a race track.

With a DOHC car, one that has more HP than torque and makes it's power at 5,500k RPM and up anything that helps bring you into the power band quicker is better.

With pushrod motors you have peak power and a broad torque curve starting as low as 4k RPM so you want to keep that power band longer with a taller gear.

Although this is useless if you have too much power, or not enough power and how you're putting it down.

I think I saw this somewhere but it's something like this for Mustangs:

350HP or less = 4.10's
350-450 = 3.73's
450-550 = 3.55's
550 and up = 3.23 or 3.31 in our case.

I have 3.31s, let's race.

Me too

i have 3.73s but plan on going down to 3.27 since i went boost

3.31 vs 3.73
 

We should just swap rear ends then hahaha.

shoot, if i was home, i dont see a problem with that.

i'll be adding in an Eaton Limited Slip Differential as well since they will have the rear end opened for the gears.

<--keeping my 3.15's....

This is kind of what I feel I might do next. I rarely have the car at 120+ and I am not going boosted or big power anytime soon, so I wouldn't mind ditching my 3.31s for 3.73s. No Jeff I don't want your 4.10s!

Want my 4.10's?

nope!

Yes foo

there are a lot of different factors that come into play besides just final drive gear ratio.

the difference between the two is probably not that noticeable.

3.31 vs 3.73
 

Even a couple hundred RPM over 3-4 gears could mean the difference.

I have been to the track with a 3:73 car that is non Brembo and no tune just a cold air/horrible driver. I do not hit the limiter and shift at 6,800-7,000. The non brembo cars with the 245/45 19 is a 27.7 inch tall tire which helps. The brembo guys have a 255/40 19 which is a 27 inch tall tire. That is part of the reason for the rev limiter issue. The 3:73 do get you in the band nicely.