CorvetteForum - Chevrolet Corvette Forum Discussion

C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

RPM at speed question.

Thread Tools
 
Search this Thread
 
Old Apr 18, 2008 | 01:54 PM
Share
  #1  
dchildress's Avatar
dchildress
Thread Starter
Pro
10 Year Member
 
Joined: Mar 2005
Posts: 666
Likes: 0
From: Walton KY
Default RPM at speed question.
I have a 94 LT1 6speed coupe. I drove a customer's 95 LT1 today and his felt a bit like a dog. I was curious if the previous owner of mine could have changed the gears. I can run in 6th at 40 MPH with little to no bogging. My build decal says I have RPO GM3 3.45 rear gears from the factory.

I would like for you guys to chime in and test this for me. Let me know what RPMs you turn in 4th gear at 55 MPH. I am at 2500 to 2550.
Reply
0
Old Apr 18, 2008 | 02:14 PM
Share
  #2  
mdlfcrss's Avatar
mdlfcrss
Burning Brakes
 
Joined: Aug 2006
Posts: 1,123
Likes: 1
From: Rockland County NY
Default
I have a 91 with the same setup (6spd w/3:45 rear). I don't get out of work 'till 8pm, then straight to my little guys baseball game, so I'll let you know, but it won't be until about 10:30 est.
Reply
0
Old Apr 18, 2008 | 02:23 PM
Share
  #3  
bjankuski's Avatar
bjankuski
Safety Car
20 Year Member
Photogenic
Liked
Top Answer: 1
 
Joined: Sep 2001
Posts: 4,157
Likes: 554
From: Glenbeulah Wi
Default
Originally Posted by dchildress
I have a 94 LT1 6speed coupe. I drove a customer's 95 LT1 today and his felt a bit like a dog. I was curious if the previous owner of mine could have changed the gears. I can run in 6th at 40 MPH with little to no bogging. My build decal says I have RPO GM3 3.45 rear gears from the factory.

I would like for you guys to chime in and test this for me. Let me know what RPMs you turn in 4th gear at 55 MPH. I am at 2500 to 2550.
If you do the math 3.45 gears at 55MPH should be 2472 RPM.
Reply
0
Old Apr 18, 2008 | 04:18 PM
Share
  #4  
psd_bullitt's Avatar
psd_bullitt
Instructor
 
Joined: Jan 2008
Posts: 245
Likes: 0
From: McKinney Texas
Default
Use this website to calculate the gear/speed table with your tire size. Select the ZF transmission.

http://www.f-body.org/gears/
Reply
0
Old Apr 18, 2008 | 05:39 PM
Share
  #5  
STL94LT1's Avatar
STL94LT1
Race Director
20 Year Member
Conversation Starter
All Eyes On Me
Liked
 
Joined: Jan 2002
Posts: 12,263
Likes: 86
From: O'Fallon Missouri
Default
Originally Posted by dchildress
I would like for you guys to chime in and test this for me. Let me know what RPMs you turn in 4th gear at 55 MPH. I am at 2500 to 2550.
Your gears are stock.
Reply
0
Old Apr 20, 2008 | 05:16 PM
Share
  #6  
dchildress's Avatar
dchildress
Thread Starter
Pro
10 Year Member
 
Joined: Mar 2005
Posts: 666
Likes: 0
From: Walton KY
Default
Thanks guys....that answers my questions....I guess I do have the stock gear.s
Reply
0
Old Apr 20, 2008 | 05:51 PM
Share
  #7  
Syclone354's Avatar
Syclone354
Instructor
 
Joined: Aug 2006
Posts: 143
Likes: 0
From: MD
Default
maybe the other car had 3.07s?
Reply
0
Old Apr 20, 2008 | 08:08 PM
Share
  #8  
dchildress's Avatar
dchildress
Thread Starter
Pro
10 Year Member
 
Joined: Mar 2005
Posts: 666
Likes: 0
From: Walton KY
Default
Originally Posted by Syclone354
maybe the other car had 3.07s?
Could be. I know that he still had the stock CAGS hooked up and it made me shift to 4th early. In mine, I can pull 4th from 15 mph, his just did not feel like it would.

Thanks for the help guys.
Reply
0
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-1

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-2

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-3

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-4

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-5

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-6

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-7

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-8

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-9

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
Old Apr 20, 2008 | 09:49 PM
Share
  #9  
STL94LT1's Avatar
STL94LT1
Race Director
20 Year Member
Conversation Starter
All Eyes On Me
Liked
 
Joined: Jan 2002
Posts: 12,263
Likes: 86
From: O'Fallon Missouri
Default
Originally Posted by Syclone354
maybe the other car had 3.07s?
I really doubt that anyone would put 3.07 gears in a stock M6 LT1.
Reply
0
Old Apr 21, 2008 | 01:05 PM
Share
  #10  
dchildress's Avatar
dchildress
Thread Starter
Pro
10 Year Member
 
Joined: Mar 2005
Posts: 666
Likes: 0
From: Walton KY
Default
Originally Posted by STL94LT1
I really doubt that anyone would put 3.07 gears in a stock M6 LT1.
What other gear options were available in the LTx models?
Reply
0
Old Apr 21, 2008 | 01:10 PM
Share
  #11  
STL94LT1's Avatar
STL94LT1
Race Director
20 Year Member
Conversation Starter
All Eyes On Me
Liked
 
Joined: Jan 2002
Posts: 12,263
Likes: 86
From: O'Fallon Missouri
Default
The only gearset available for the M6 94-96 LT1/4 was 3.45:1. Some claim a few earlier M6 LT1's had a different gear, I've yet to see that proven.
Reply
0
Old Apr 21, 2008 | 01:49 PM
Share
  #12  
Aurora40's Avatar
Aurora40
Le Mans Master
10 Year Member
 
Joined: Apr 2005
Posts: 6,413
Likes: 9
From: The Old Dominion
Default
Perhaps his car simply isn't in as good a tune as yours, causing the roughness at low rpm operation.
Reply
0

Get notified of new replies

To RPM at speed question.

Back to Subforum
C4 Tech/Performance
View Next Unread
84 Crossfire "Backfire"




Click for Advanced Search
Reply Closed Thread Share
Forum Jump
Trending Topics

All times are GMT -4. The time now is 07:16 AM.

story-0
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-1
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-2
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-3
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-4
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-5
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-6
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE