gear ratios and acceleration - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Reply
 
 
 
Thread Tools Search this Thread
Old 11-04-2008, 06:53 PM   #1
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Jan 2008
Location: rockford, illinois
Posts: 281
Thanks: 0
Thanked 0 Times in 0 Posts
bonny99 is on a distinguished road
Default gear ratios and acceleration

What gear ratios are better for acceleration and what ratios are better at the the top end.
bonny99 is offline   Reply With Quote
Old 11-04-2008, 08:32 PM   #2
Senior Member
True Car Nut
 
Purplehazeir's Avatar
 
Join Date: Sep 2008
Location: Arlington, WA
Posts: 7,979
Thanks: 0
Thanked 1 Time in 1 Post
Purplehazeir is on a distinguished road
Default

Try this link for some good info Gear ratio - Wikipedia, the free encyclopedia

For quick off the line acceleration you want a higher ratio.
For better fuel economy you want a lower ratio.
High performance cars usually run a 3.73:1 or a 4.10:1
Purplehazeir is offline   Reply With Quote
Old 11-04-2008, 08:49 PM   #3
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Jan 2008
Location: rockford, illinois
Posts: 281
Thanks: 0
Thanked 0 Times in 0 Posts
bonny99 is on a distinguished road
Default

Ok, the trans in my bonne is out of a lesabre with the 3.05 ratio which gets 31 mpg and is sluggish of the line but hauls around 3500 rpm.
bonny99 is offline   Reply With Quote
Old 11-04-2008, 09:02 PM   #4
Senior Member
Posts like a Turbo
 
lordvader's Avatar
 
Join Date: Sep 2008
Location: Philadelphia, PA
Posts: 332
Thanks: 0
Thanked 0 Times in 0 Posts
lordvader is on a distinguished road
Default

i think the o.e. trans in the bonnie has a different ratio from the one in the lesab.
lordvader is offline   Reply With Quote
Old 11-05-2008, 02:11 AM   #5
Senior Member
Posts like a Northstar
 
Join Date: Apr 2006
Location: Robertsdale Alabama
Posts: 500
Thanks: 0
Thanked 0 Times in 0 Posts
hugger10 is on a distinguished road
Default

Bonnevilles have 2.93 or some ****. Which is fine because an l67 with light mods can break the tires loose up until around 30mph. Any higher gear than that and you better have an LSD.
hugger10 is offline   Reply With Quote
Old 11-05-2008, 08:27 AM   #6
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

All figures are 96+
NA'* should have either a 2.84 or 3.05/3.06 stock ratio. SC'd would have 2.93

Most people changing gears in their SC'd car go to 3.29 or 3.69 ratios. Overall the highter the number the better for acceleration if you can hold traction. The lower the number the better for highway crusing and fuel mileage.
BillBoost37 is offline   Reply With Quote
Old 11-07-2008, 06:26 AM   #7
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Jan 2008
Location: rockford, illinois
Posts: 281
Thanks: 0
Thanked 0 Times in 0 Posts
bonny99 is on a distinguished road
Default

alright so even though i have the 3.05 ratio, could i still modify the engine so it would compensate for the sluggish tranny.
bonny99 is offline   Reply With Quote
Old 11-07-2008, 08:25 AM   #8
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

Sure, there are things you can do to move it out better.

Ported lower intake manifold
Less restrictive air filter
Gutted airbox or FWI
Rocker arms to a better ratio
Ported or freed up front exhaust manifold
and the list is much longer.

My suggestion would be to call Intense-Racing and talk to them. They have some great solutions as well search the various forums out there. Tons of great info can be found. Do a ton of research and plan out your mods before spending and you'll be into the power for as little as possible.

Last edited by BillBoost37; 11-07-2008 at 08:27 AM.
BillBoost37 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Transmission Gear ratios and the PCM jshelton54 2000-2005 3 08-25-2006 02:25 PM
FYI if you lose 4th gear / no fourth gear / no 4th gear caminated2k 2000-2005 6 07-24-2005 11:26 PM
Can someone give me a lesson on gear ratios? ComfyCar General GM Chat 12 07-20-2005 12:39 AM
gear ratios macho_mike21 General GM Chat 4 08-04-2004 04:23 PM
Gear/axle ratios questions OLBlueEyesBonne General GM Chat 9 09-23-2003 04:32 PM


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 Off
Refbacks are Off



All times are GMT -4. The time now is 10:39 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.