What's a good gear size? - LS1TECH

Go Back   LS1TECH > CHASSIS, SUSPENSION, APPEARANCE > Gears & Axles
Log In 
Search


Gears & Axles
Driveshafts | Rearends | Differentials | Gears | 12 Bolt | 9 Inch | Dana
Sponsored by
JawsGear


What's a good gear size?

Reply
 
Thread Tools Search this Thread
Old 06-25-2012, 02:29 PM   #1
On The Tree
 
hotrodth's Avatar
 
Trader Rating: 0
Join Date: Mar 2011
Location: jax, fl
Posts: 161
Default What's a good gear size?

Running 233/239 cam stage 2.5 5.3 heads. Currently have 3.73s this is with t56 and 27" tire. Wondering if a 4.56 is too much?
__________________
Ls1 prc2.5 5.3 heads 233/239 cam ls6 intake 3.73 gears pacesetter lts
hotrodth is offline   Reply With Quote
Old 06-26-2012, 05:09 AM   #2
LS1Tech Sponsor
 
Bob@BruteSpeed's Avatar
 
Trader Rating: 16
Join Date: Mar 2003
Location: Roanoke, In
Posts: 19,275
Default

You need to figure out what rpm you want to be going through the traps at. Bob
__________________
ATI ProCharger and Moser Sales 260 672-2076

E-mail: brutespeed@gmail.com


https://www.brutespeed.com/index.htm Link to website


Bob@BruteSpeed is online now   Reply With Quote
Old 06-26-2012, 06:19 AM   #3
On The Tree
 
hotrodth's Avatar
 
Trader Rating: 0
Join Date: Mar 2011
Location: jax, fl
Posts: 161
Default

Not sure. I know with the 3.73 I am hitting 6k in 3rd about 20-30 yards before finish line. No time to hit 4th to make a diff. I'm hitting 100mph in 3rd at 6000. My limited has been raised to 6800 since cam install
__________________
Ls1 prc2.5 5.3 heads 233/239 cam ls6 intake 3.73 gears pacesetter lts
hotrodth is offline   Reply With Quote
Old 06-26-2012, 06:20 AM   #4
On The Tree
 
hotrodth's Avatar
 
Trader Rating: 0
Join Date: Mar 2011
Location: jax, fl
Posts: 161
Default

My 60 ft SUX at a 2.2
__________________
Ls1 prc2.5 5.3 heads 233/239 cam ls6 intake 3.73 gears pacesetter lts
hotrodth is offline   Reply With Quote
Old 06-26-2012, 06:23 AM   #5
On The Tree
 
hotrodth's Avatar
 
Trader Rating: 0
Join Date: Mar 2011
Location: jax, fl
Posts: 161
Default

Also cruising on highway in 6th at 70-75 My rpm is at 1700.
__________________
Ls1 prc2.5 5.3 heads 233/239 cam ls6 intake 3.73 gears pacesetter lts
hotrodth is offline   Reply With Quote
Old 06-26-2012, 08:43 AM   #6
11 Second Club
 
Ethan[ws6]'s Avatar
 
Trader Rating: 13
Join Date: Jan 2009
Location: Indianapolis, Indiana
Posts: 849
Send a message via AIM to Ethan[ws6]
Default

I have 4.56's with a tire that is ~25.66" and 4th gear maxes out right around 115mph for me. With the taller tire you would get some more MPH to play with than that. Do you daily drive the car?
__________________
Ethan[ws6] is offline   Reply With Quote
Old 06-26-2012, 08:55 AM   #7
On The Tree
 
hotrodth's Avatar
 
Trader Rating: 0
Join Date: Mar 2011
Location: jax, fl
Posts: 161
Default

No not a dd but its my only vehicle.I drive company truck every day. I don't want to lose all my top end. But I only have like two choices for a Toyota 8.4" rear. 4.10s or 4.56. Id like some 4.30s but can't find any.
__________________
Ls1 prc2.5 5.3 heads 233/239 cam ls6 intake 3.73 gears pacesetter lts
hotrodth is offline   Reply With Quote
Old 06-27-2012, 08:05 AM   #8
11 Second Club
 
Ethan[ws6]'s Avatar
 
Trader Rating: 13
Join Date: Jan 2009
Location: Indianapolis, Indiana
Posts: 849
Send a message via AIM to Ethan[ws6]
Default

You won't lose any top end really. Even with a 4.56 6th gear would be good for over 200mph, assuming you had enough power to hit that mark.

When setting up gearing, you want to look at your trap speed. You want to try and make it so that as you are crossing the finish line you are just passing peak power in your 1:1 gear. So, if power is starting to fall off at 6500 (just for example), you would want to set gearing so that you are crossing the line at ~6600 in 4th gear. That will be the absolute best setup for track use.
__________________
Ethan[ws6] is offline   Reply With Quote
Old 06-27-2012, 10:07 PM   #9
Staging Lane
 
Trader Rating: 1
Join Date: Jun 2012
Posts: 66
Default

I have 4.56's and love em ! 65 mph @ 2000 rpms
L84ARACE is offline   Reply With Quote
Old 06-28-2012, 03:38 AM   #10
On The Tree
 
hotrodth's Avatar
 
Trader Rating: 0
Join Date: Mar 2011
Location: jax, fl
Posts: 161
Default

Quote:
Originally Posted by L84ARACE View Post
I have 4.56's and love em ! 65 mph @ 2000 rpms
What tire size?
__________________
Ls1 prc2.5 5.3 heads 233/239 cam ls6 intake 3.73 gears pacesetter lts
hotrodth is offline   Reply With Quote
Old 06-28-2012, 05:46 AM   #11
11 Second Club
 
Ethan[ws6]'s Avatar
 
Trader Rating: 13
Join Date: Jan 2009
Location: Indianapolis, Indiana
Posts: 849
Send a message via AIM to Ethan[ws6]
Default

He's probably running around the same tire size I am. My 65MPH is right around that RPM as well. I'm running a ~25.66 tall tire. 275/40/17
__________________
Ethan[ws6] is offline   Reply With Quote
Old 06-28-2012, 06:07 AM   #12
On The Tree
 
hotrodth's Avatar
 
Trader Rating: 0
Join Date: Mar 2011
Location: jax, fl
Posts: 161
Default

This is in 6th correct
__________________
Ls1 prc2.5 5.3 heads 233/239 cam ls6 intake 3.73 gears pacesetter lts
hotrodth is offline   Reply With Quote
Old 07-01-2012, 12:25 AM   #13
11 Second Club
 
Ethan[ws6]'s Avatar
 
Trader Rating: 13
Join Date: Jan 2009
Location: Indianapolis, Indiana
Posts: 849
Send a message via AIM to Ethan[ws6]
Default

Yes..
__________________
Ethan[ws6] is offline   Reply With Quote
Reply


Tags
233, 239, 373, 456, cam, gear, gears, goodgear


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


 

All times are GMT -5. The time now is 11:46 PM.


Powered by vBulletin® Version 3.8.7 AC2
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Advertising - Terms of Service - Privacy Statement - Terms of Service - JOBS
Emails & Contact Details