Need gearing help with blower/6speed setup

[mustang_guy]

Hey guys. I went to the track today for the first time since the Paxton blower install.
I have a 2012 GT with a 6 speed manual making 589rwhp
Gears are factory 3.73's. I'm running out of gear and having to shift into 5th at the track. I'm running a 28x11.5 ET strewt an stock intake.
What are you'r suggestions for a setup to eliminate having to go into 5th and at the same time not slowing the car down?
Thanks

 

[corepwn]

What did you run and what was your MPH?

3.31s would allow you to stay in 4th.
7200rpm in 4th with stock height tires and 3.31s would be 136mph.

I figure you're in the 125-131 range, putting you through the traps at 6600-7000rpm in 4th with those gears.

 

[burnin4]

This will help you....

Gear Ratio Speed Calculator

In for the et/mph as well!

 

[92hatchlx]

Stick with the 28" tire, 3.31s or even 3.15s wouldn't be too bad. Would help a lot with street driving also. If you are serious about getting gears you might consider swapping out the diff with something a little sturdier and getting your axle tubes welded. You're playing with a good amount of power and it sucks to have to do things twice! Just depends on how much the wallet will allow. Let us know what you choose.

 

[mustang_guy]

I can't remember my MPH for sure but I believe 122. I'll have to check the timeship which isn't on me.
I know the 60 foot was 1.72
Here is the vid of the pass


11.48 - YouTube


I'm wondering if a boss intake which will allow Nero rev higher and 3.55 gears will do it or if I should just go right down to a 3.31 to be sure?

 

[alex12gt]

bump the rev to 7500 thats what i run with my tvs so i dont have to hit 5th on 28in tires but this winter i will be going to 3.31s

 

[sambandit]

The way these trannys are geared, I think 3.31 is about a perfect setup.

 

[SILV03MustangGT]

The way these trannys are geared, I think 3.31 is about a perfect setup.

indeed, after installing my JLT and tune update my car will now burn my 275s all the way to 7500 in 2nd gear. very glad i have the 3.31s.

 

[5.0_KenneB]

Yeah I'm having the same problem even going to 3.55's from 3.73's. So I'm either going to go with 3.31's or 3.27's not sure yet

 

[mustang_guy]

Do you guys think a Boss intake would be a wise choice so I can bring the RPM's up a little bit which should help slightly?