Final Gear Ratios

[FNCrazy]

I'm in love! What mods do you have? So I'd call him, get the gear, and have someone locally (not me!) install it? Before I bug him, ballpark what might the gear cost?

Oh, and any changes to the speedo? Seems like there would be.

Thanks so much! *Exactly* what I'm looking for!

Sent from my SM-G935V using Tapatalk

[Cole]

Originally Posted by nikitopo

If you need more acceleration, the best approach is to have more power or less rotating mass.

So something like a light weight crank pulley?

Paging @justatroll

[FNCrazy]

Originally Posted by Cole

So something like a light weight crank pulley?

Paging @justatroll

I've been leery of that, I don't know why exactly. Partially I can't imagine it doing much good. Like I know anything though

Sent from my SM-G935V using Tapatalk

[justatroll]

Originally Posted by Cole

.... light weight crank pulley?

"Crank Pulley"???!!??

Slooowly I Turned.... STEP BY STEP

[nikitopo]

Originally Posted by FRS Justin

I would run a 4.56 ratio then it will still let first gear be usable and have a lot more bottom end. 120mph will be easy to reach in 6th 5th gear will max out around 104mph. The most I would do is a 4.88 but that is a extreme street gear and first is pretty useless.
When your ready to get a set call Mark at spencer fab in N.H. he will hook you up.

Hey Justin, long time to talk

Why 4.56 ratio gives a so small top end in 5th gear? I was thinking 5th gear would give something closer to 120mph @7400 rpm. I am using a gear ratio calculator: http://www.apexgarage.com/tech/gear_ratios.shtml

Is the actual speed much lower than the theoretical? I have a 3.7 FD and in 5th I max out around 145mph. In my car, the actual speed is the same with the theoretical.

[nikitopo]

Here is also a picture with the calculations:

[nikitopo]

Originally Posted by Cole

So something like a light weight crank pulley?

Paging @justatroll

We said less rotating mass in general. If you read the complete thread, you 'll find specific examples. First step is to use a much lighter set of wheels and tires. If you also question this, then you don't know what you are talking about.

[Dr. BRZ]

Originally Posted by FRS Justin

Yes rear diff gears,
I ran a 13.58 1/4 mile with a 4.56gear

what other mods do you have to run that time!?

[FRS Justin]

Originally Posted by nikitopo

Hey Justin, long time to talk

Why 4.56 ratio gives a so small top end in 5th gear? I was thinking 5th gear would give something closer to 120mph @7400 rpm. I am using a gear ratio calculator: http://www.apexgarage.com/tech/gear_ratios.shtml

Is the actual speed much lower than the theoretical? I have a 3.7 FD and in 5th I max out around 145mph. In my car, the actual speed is the same with the theoretical.

Ya I screwed that one up what I meant was 4th topped out not 5th..

[nikitopo]

Originally Posted by FRS Justin

Ya I screwed that one up what I meant was 4th topped out not 5th..

[FRS Justin]

Originally Posted by Dr. BRZ

what other mods do you have to run that time!?

This is the list I have to run 13.58


1: PPE merge collector header and overpipe
invidia N1 full exhaust


2: Airaid CAI


3: Delicious tuning Flexfuel kit and STG 2 tune....


4: 4:56 gears


5: Hoosier drag radials.... That's it


6: You must have no fear and worries about breaking your car!!!!!
I try to break it every pass.... Launching at 8000 RPMS and dropping the clutch.


good luck




and no I will not tell you how I went 13.47 because I plan to go back to N/A and smash the current record.




NOTE All of these times the car had full interior and A/C

[Dr. BRZ]

Originally Posted by FRS Justin

This is the list I have to run 13.58


1: PPE merge collector header and overpipe
invidia N1 full exhaust


2: Airaid CAI


3: Delicious tuning Flexfuel kit and STG 2 tune....


4: 4:56 gears


5: Hoosier drag radials.... That's it


6: You must have no fear and worries about breaking your car!!!!!
I try to break it every pass.... Launching at 8000 RPMS and dropping the clutch.


good luck




and no I will not tell you how I went 13.47 because I plan to go back to N/A and smash the current record.




NOTE All of these times the car had full interior and A/C

e85 tune, 91 or 93 tuned?

[FRS Justin]

Originally Posted by Dr. BRZ

e85 tune, 91 or 93 tuned?

E85

[FRS Justin]

DR. BRZ My tuner flew in for the weekend to go to the track with us you should come down to San Antonio raceway park and hang Friday and Saturday...