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

IRS weight ???

Thread Tools
 
Search this Thread
 
Old Mar 25, 2008 | 03:22 AM
  #1  
red L98's Avatar
red L98
Thread Starter
Melting Slicks
20 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Jul 2003
Posts: 2,284
Likes: 4
From: Canton MI
Default IRS weight ???

sup guys,

how much does a complete IRS weight ? from axle to axle
Reply
Old Mar 25, 2008 | 04:16 AM
  #2  
toptechx6's Avatar
toptechx6
Safety Car
15 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Jun 2006
Posts: 3,629
Likes: 28
From: FL
Default

The shipping receipt on the D44 I purchased says 285 LBS. I am not sure if that includes the pallet but imagine it does. The rear suspension was complete from rotor to rotor and there was a support beam included.
Reply
Old Mar 25, 2008 | 08:30 AM
  #3  
cbernhardt's Avatar
cbernhardt
Safety Car
Veteran: Navy
25 Year Member
Liked
Top Answer: 1
 
Joined: Dec 1999
Posts: 4,389
Likes: 1,185
From: Lexington,NC,USA
C1 of Year Finalist (track prepared) 2019
Default

A few years ago I modified a C1 frame to accept a C4 suspension. I was curious as to the weight savings with the new suspension and I weighed a complete '92 rear suspension. It weighed 252 lbs (no wheels).
Charles
Reply
Old Mar 25, 2008 | 12:33 PM
  #4  
red L98's Avatar
red L98
Thread Starter
Melting Slicks
20 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Jul 2003
Posts: 2,284
Likes: 4
From: Canton MI
Default

Originally Posted by cbernhardt
A few years ago I modified a C1 frame to accept a C4 suspension. I was curious as to the weight savings with the new suspension and I weighed a complete '92 rear suspension. It weighed 252 lbs (no wheels).
Charles

cool thanks guys,
Reply
Old Mar 25, 2008 | 07:53 PM
  #5  
DVNCI's Avatar
DVNCI
Melting Slicks
25 Year Member
 
Joined: Jun 1999
Posts: 2,949
Likes: 23
From: Bowling Green KY
Default

Why?
Reply
Old Mar 26, 2008 | 01:50 AM
  #6  
red L98's Avatar
red L98
Thread Starter
Melting Slicks
20 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Jul 2003
Posts: 2,284
Likes: 4
From: Canton MI
Default

Originally Posted by RUKWKR
Why?
wanted to see how much weight i saved going to an axle
Reply
Old Mar 26, 2008 | 09:00 AM
  #7  
cbernhardt's Avatar
cbernhardt
Safety Car
Veteran: Navy
25 Year Member
Liked
Top Answer: 1
 
Joined: Dec 1999
Posts: 4,389
Likes: 1,185
From: Lexington,NC,USA
C1 of Year Finalist (track prepared) 2019
Default

Originally Posted by red L98
wanted to see how much weight i saved going to an axle
So how much weight savings (if any) did you get? On my '62 vette the solid axle weighed 268# so I actually lost weight by going to the IRS.
Charles
Reply
Old Mar 26, 2008 | 09:06 AM
  #8  
DVNCI's Avatar
DVNCI
Melting Slicks
25 Year Member
 
Joined: Jun 1999
Posts: 2,949
Likes: 23
From: Bowling Green KY
Default

Originally Posted by red L98
wanted to see how much weight i saved going to an axle
Yeah I figured, was just pulling your chain a little.

cuz' I'm curious as well. Wish I had weighed mine when I took it out. I know it's heavy as hell!!!!!!!! Even with 2 guys on either end it's a heavy *****'
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

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

 Michael S. Palmer
story-1

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

 Joe Kucinski
story-2

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

 Joe Kucinski
story-3

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

 Verdad Gallardo
story-4

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

 Joe Kucinski
story-5

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

 Verdad Gallardo
story-6

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
story-7

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

 Michael S. Palmer
story-8

10 Revolutionary 'Corvette Firsts' Most People Don't Know

 Joe Kucinski
story-9

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

 Michael S. Palmer
Old Mar 26, 2008 | 11:19 AM
  #9  
RacerX70CC's Avatar
RacerX70CC
Melting Slicks
10 Year Member
 
Joined: Nov 2004
Posts: 2,799
Likes: 2
From: Cape Coral FL
Default

Originally Posted by RUKWKR
Yeah I figured, was just pulling your chain a little.

cuz' I'm curious as well. Wish I had weighed mine when I took it out. I know it's heavy as hell!!!!!!!! Even with 2 guys on either end it's a heavy *****'
Doesn't matter in your case... you've got enough tubing that probably weighs as much as a Honda back there alone WITHOUT the rearend! (just pullin' yer chain btw.... it's all good)
Reply
Old Mar 26, 2008 | 12:44 PM
  #10  
DVNCI's Avatar
DVNCI
Melting Slicks
25 Year Member
 
Joined: Jun 1999
Posts: 2,949
Likes: 23
From: Bowling Green KY
Default

Originally Posted by RacerX70CC
Doesn't matter in your case... you've got enough tubing that probably weighs as much as a Honda back there alone WITHOUT the rearend! (just pullin' yer chain btw.... it's all good)
LOL, you WOULD think that. But I was amazed at how light the chromoly tubing is, if the whole cage was out of the car you could probably pick it up with one hand. I picked up about a 15 foot bar of it and it was a featherweight.

But the way he builds these rearends they are heavy duty!!!!!

(sorry red don't mean to hijack )
Reply
Old Mar 26, 2008 | 07:51 PM
  #11  
red L98's Avatar
red L98
Thread Starter
Melting Slicks
20 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Jul 2003
Posts: 2,284
Likes: 4
From: Canton MI
Default

i saved little bit over 100 pounds over the IRS.
Reply
Old Mar 26, 2008 | 08:51 PM
  #12  
cbernhardt's Avatar
cbernhardt
Safety Car
Veteran: Navy
25 Year Member
Liked
Top Answer: 1
 
Joined: Dec 1999
Posts: 4,389
Likes: 1,185
From: Lexington,NC,USA
C1 of Year Finalist (track prepared) 2019
Default

Originally Posted by red L98
i saved little bit over 100 pounds over the IRS.
Does your 100# savings include all mounting brackets, locating rods, springs, shocks, brake rotors, calipers?
What solid axle are you using?
Just curious because I am building another car that has C4 suspension and I've been thinking about a solid axle for it.

Charles
Reply
Old Mar 27, 2008 | 05:03 AM
  #13  
toptechx6's Avatar
toptechx6
Safety Car
15 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Jun 2006
Posts: 3,629
Likes: 28
From: FL
Default

Originally Posted by red L98
i saved little bit over 100 pounds over the IRS.
Wow, that is quite a bit. Certainly NOT disputing your claim, but have to wonder how it is possible. I would expect a steel solid axle housing and axles to outweigh the aluminum pumpkin, batwing and half shafts and the coil springs to outweigh the monospring. Calipers and rotors would be a "wash", control links should be too except for the toe and camber rods which are pretty light, interesting.
Reply
Old Mar 27, 2008 | 08:27 AM
  #14  
ski_dwn_it's Avatar
0ski_dwn_it
Former Vendor
 
Joined: Jun 2001
Posts: 7,204
Likes: 6
From: St Marys PA
Default

well I can believe it because we just installed on in a guys car and removed the IRS. I can grab the complete moser 12bolt and move it around fairly easily by myself (lifting it etc) and with the IRS complete it takes two guys to lift it into a truck. Those suckers are HEAVY. Also with the IRS there is a lot more MASS there , which I am sure contributes.

I do not have a large enough scale to weight them both however, but my guess is the solid rear is lighter.
Reply
Old Mar 27, 2008 | 09:00 AM
  #15  
toptechx6's Avatar
toptechx6
Safety Car
15 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Jun 2006
Posts: 3,629
Likes: 28
From: FL
Default

Originally Posted by ski_dwn_it
well I can believe it because we just installed on in a guys car and removed the IRS. I can grab the complete moser 12bolt and move it around fairly easily by myself (lifting it etc) and with the IRS complete it takes two guys to lift it into a truck. Those suckers are HEAVY. Also with the IRS there is a lot more MASS there , which I am sure contributes.

I do not have a large enough scale to weight them both however, but my guess is the solid rear is lighter.
I'll take your word for it, but would not have guessed the difference to be that great (100lbs.) I do understand the complete IRS is a pain to move around single handed, but expect that has more to do with the awkwardness of the assembly than the weight, you lost me on the "mass" concept unless that is what you meant?
Reply
Old Mar 27, 2008 | 09:32 AM
  #16  
ski_dwn_it's Avatar
0ski_dwn_it
Former Vendor
 
Joined: Jun 2001
Posts: 7,204
Likes: 6
From: St Marys PA
Default

Again I did not actually weigh it, but just moving the two around the 12bolts seem to be lighter. Remember the hubs and stuff on the D44 are HUGE compared to the 12bolt that just has a simple 1/4" flange....not to mention the 1/2 shafts, 4 more ujoints, control arms brackets for them, and I am sure many other things.

At the end of the day the real advantage is in efficiency and strength gains with the 12bolt. Even if it weighted 100lb more, you would still be way ahead of the game in performance and reliability. My car went a solid .25 sec quicker with the install of the solid rear. And that was with the big wheelstands which were gobbling up ET. There is no comparison between the two systems.
Reply
Old Mar 27, 2008 | 12:04 PM
  #17  
red L98's Avatar
red L98
Thread Starter
Melting Slicks
20 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Jul 2003
Posts: 2,284
Likes: 4
From: Canton MI
Default

My rear-end has gun drilled axles, aluminum spool and yoke, pro gear and mostly chrome molly. also the fact that its narrowed makes everything like the axles and housing lighter. I was able to pick my housing right off the ground with no problem what so ever. Ill have the for sure weight saving for you guys this weekend …. Thanks
Reply

Get notified of new replies

To IRS weight ???

Old Mar 27, 2008 | 02:28 PM
  #18  
toptechx6's Avatar
toptechx6
Safety Car
15 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Jun 2006
Posts: 3,629
Likes: 28
From: FL
Default

Originally Posted by red L98
My rear-end has gun drilled axles, aluminum spool and yoke, pro gear and mostly chrome molly. also the fact that its narrowed makes everything like the axles and housing lighter. I was able to pick my housing right off the ground with no problem what so ever. Ill have the for sure weight saving for you guys this weekend …. Thanks
Okay, thanks for the explanation, that makes sense. Look forward to hearing what the difference is once you weight it.
Reply
Old Mar 27, 2008 | 11:07 PM
  #19  
hexane's Avatar
hexane
Melting Slicks
 
Joined: May 2007
Posts: 2,382
Likes: 2
From: Kathleen FL
Default

Removing the IRS and replacing it with a straight axle could contribute to some weight savings. I hope I can get it down to less than 2700 lbs one day.
Reply
Old Mar 28, 2008 | 05:07 PM
  #20  
REDC4CORVETTE's Avatar
REDC4CORVETTE
Safety Car
10 Year Member
 
Joined: Apr 2004
Posts: 4,532
Likes: 7
From: Lahaina Hi
Default

Originally Posted by red L98
My rear-end has gun drilled axles, aluminum spool and yoke, pro gear and mostly chrome molly. also the fact that its narrowed makes everything like the axles and housing lighter. I was able to pick my housing right off the ground with no problem what so ever. Ill have the for sure weight saving for you guys this weekend …. Thanks
You want your old rear back
Try Dennys half shafts which are 12 lbs more than the rear I bought off you.
I think that weight back their is the only thing keeping it on the ground.
Reply



All times are GMT -4. The time now is 06:03 AM.

story-0
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-1
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-2
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-3
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
story-4
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-5
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-6
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-7
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-8
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-9
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE