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4/11/2012 7:18 pm  #61


Re: The Chevrolet IRS picture thread

Here's a good pic of a C3 using an upper link to take the load off the half shaft. Along with splined half shafts. Also the chassis using a composite dual mounted spring. This type of mounting allows the springs center section to bend in the opposite direction. In turn you get an anti sway bar effect from this design. You can see the bend in the center even when the suspension is unloaded. The mounts are also adjustable in and out.

http://www.vettemod.com/forum/imagehosting/214f84e82e6e1d0.jpg

http://www.vettemod.com/forum/index.php

Last edited by Ralphy (4/11/2012 7:21 pm)

 

4/12/2012 2:50 am  #62


Re: The Chevrolet IRS picture thread

Karsten is doing some very nice work there.
Here is my "Jim's Giovanni"I was building before the IRS "revolution!
http://www.vettemod.com/forum/imagehosting/thum_12694eac8a58e7b6b.jpg


The improvements in camber control are obvious below:
http://www.vettemod.com/forum/imagehosting/thum_12694eac8a5ca205f.jpg


Here is a clip from an article in the early 80's:
http://www.vettemod.com/forum/imagehosting/thum_12694eac9ae177ccc.jpg


What the system doesn't do -- control the toe angle that gets all out of whack due to the trailing arm set up.
I'm eliminating that with the Wishbones.  More later.

Cheers - Jim


UNDERCONSTRUCTION! Highly Modified C3 Corvette
         Dual Wishbone IRS w Subframe + Custom Uprights
 

6/25/2012 8:07 am  #63


Re: The Chevrolet IRS picture thread

C3 conversion design in a Cheetah.
http://z3.invisionfree.com/cheetahcars/index.php?act=Attach&type=post&id=8828374

http://z3.invisionfree.com/cheetahcars/index.php?act=Attach&type=post&id=8828375

http://z3.invisionfree.com/cheetahcars/index.php?showtopic=102

http://z3.invisionfree.com/cheetahcars/index.php?act=Attach&type=post&id=8829057

Last edited by Ralphy (6/25/2012 11:07 am)

 

6/25/2012 3:00 pm  #64


 

6/27/2012 10:10 pm  #65


 

6/29/2012 8:32 am  #66


Re: The Chevrolet IRS picture thread

Very informative, as well as providing  diverse interpretations in improving what at the time Zora Arkus Duntov designed it was way ahead of the curve, and was a wake up call for the competition. The Dick Guldstrand package appears to be closest to what is needed for my application: C3 IRS to '57 Chevy PU, should that option be taken. Mr Guldstand personally responded to my call this speaks volumes as to the integrity of Mr. Guldstrand and his firm.

 

6/30/2012 9:21 pm  #67


Re: The Chevrolet IRS picture thread

It appears the C2 and C3 rear roll center is 7.56 inches. You can see the numbers well enough if you select view and zoom several times. Front RC looks to be 3.25. There my be two different roll centers on the C3 since it has two different HS lengths.
http://corvette-world.com/product_thumb.php?img=images/66GMCO02.jpg&w=433&h=600


This article mentions lowering the RC by adding a 1/2" spacer. Pg. 46 & 47.
http://www.corvettefaq.com/c3/vip.pdf

Ralphy

Last edited by Ralphy (7/01/2012 8:03 am)

 

6/30/2012 9:49 pm  #68


Re: The Chevrolet IRS picture thread

 

6/30/2012 10:08 pm  #69


Re: The Chevrolet IRS picture thread

Blackstone Race Cars custom IRS in a C3.
The carrier is a Strange 12 bolt. The case is a Strange 9" housing designed to hold a 12 bolt carrier, then narrowed with Strange inner axles. The rear portion of the housing is fabricated steel, X10 material. Half shafts are 4".
http://i197.photobucket.com/albums/aa210/itzachance/DSC00028.jpg

http://www.digitalcorvettes.com/forums/showthread.php?t=122850

http://www.youtube.com/watch?v=_NM4zB2-dpc

 

7/01/2012 5:30 am  #70


Re: The Chevrolet IRS picture thread

Walter Korff has the C2 diagram in his, Designing Tomorrow's Cars as well as a C3 Roll Center Diagram. 
I'll scan and post the C3 image later in this thread.
The C3 is shown as having a 3.25 inch RC Above Ground Level (AGL), and the rear at 4.71 inches AGL.

John Giovanni patented a modification to the C3 which is fairly easily replicated by many -- including me.  Its big advantages:
1.  Removing the half shafts as loaded members of the suspension, and
2.  Variable placement of the Roll Center - here shown with  unequal/parallel control arms. 

I have my measurements posted elsewhere in the forum.

http://i48.tinypic.com/30ngqhs.jpg


It does however, retain the Trailing Arms - which add an unfortunate Toe-In/Out contribution to the suspension.

Cheers - Jim


UNDERCONSTRUCTION! Highly Modified C3 Corvette
         Dual Wishbone IRS w Subframe + Custom Uprights
 

7/01/2012 8:01 am  #71


Re: The Chevrolet IRS picture thread

Phantomjock,
I forgot to mention there are two HS lengths as far as I know on the C3. My guess is the two have different roll centers. I'm going to update my post.

You know what? I just looked at that Grand Sport IRS pic again. The camber rods look to be much higher at the carrier. Is that maybe the high RC PJ? Then if you look at the pic in this pdf file on page 46. The middle camber rod bracket 80 82 looks to be upside down again raising the inner pivot point. I'm confused?  The so called 80 82 bracket looks to put the location similar to the Grand Sport location. Which to me should be a higher RC.
http://www.corvettefaq.com/c3/vip.pdf

Ralphy

Last edited by Ralphy (7/01/2012 9:36 am)

 

7/01/2012 4:36 pm  #72


Re: The Chevrolet IRS picture thread

I get 32 pages total on the pdf  so couldn't get "exactly" to #46  - but I did review and think I get your meaning. 
(Somewhere in my closet are all the originals of those cut ans saved from Corvette Fever in the 80s!)

The VIP, Greenwood, and Herb Adams upgrades all mentioned lowering the Lower Strut Rod Mount using spacers. For my Giovanni,  I originally built a new Lower Strut Mount out of some 3x3 channel and drilled lower holes to effectively do the same thing.  I was interested in zeroing out Camber change on the outside wheel - which you can tailor.  But that damn Toe was still there!

I think there was a change in HS length during the C3 - to C4 transition.  May have been in c3s too,  I'd have to do some research. 


Cheers - Jim


UNDERCONSTRUCTION! Highly Modified C3 Corvette
         Dual Wishbone IRS w Subframe + Custom Uprights
 

7/01/2012 7:44 pm  #73


Re: The Chevrolet IRS picture thread

The guys at VetteMod said there were two C3 lengths app 1/2" difference. The page # I refereed to is the article page not the pdf page. Anyhow you've got it.

Ralphy

Last edited by Ralphy (7/01/2012 7:46 pm)

 

8/07/2012 7:00 am  #74


Re: The Chevrolet IRS picture thread

Ralphy wrote:

Is this guy asking for trouble?  Those coilover mounts, Hmmm........
http://i256.photobucket.com/albums/hh193/RPM-2/Joeys%2067%20Camaro/DSCF3454.jpg


Pro Squat anyone?
http://i256.photobucket.com/albums/hh193/RPM-2/Joeys%2067%20Camaro/DSCF3463.jpg

http://m.modernhemi.com/forums/showthread.php?t=1014984
This should maybe be titled, how not to do it. Look at the trailing links in the upper photo. Wheels hanging, it still appears they are lower in front.

Not to mention the huge bending force put on the bolts that hold the trailing arms to the uprights!

Shiny Side Up!
Bill


Check out my latest project, "In the Company of Devils" at www.WilliamKElliott.com
 

8/07/2012 1:17 pm  #75


Re: The Chevrolet IRS picture thread

WOW! I was waiting for someone to point out the coilovers. I see an aluminum fracture on the upright sooner than later.

Are you planning on keeping the toe rods the same length as the C4 or will you go shorter to remove the roll steer/ bump steer?

Ralphy

 

8/07/2012 1:36 pm  #76


Re: The Chevrolet IRS picture thread

Ralphy wrote:

WOW! I was waiting for someone to point out the coilovers. I see an aluminum fracture on the upright sooner than later.

Are you planning on keeping the toe rods the same length as the C4 or will you go shorter to remove the roll steer/ bump steer?

Ralphy

Yeah, they aren't exactly mounted well either, are they? LOL

And yet all that extra strength added to the batwing.

Shiny Side Up!
Bill


Check out my latest project, "In the Company of Devils" at www.WilliamKElliott.com
 

8/07/2012 1:44 pm  #77


Re: The Chevrolet IRS picture thread

Maybe if he had a bracket tying the coilover mount to the trailing links?

This would be the end at app. 60 MPH!
http://4.bp.blogspot.com/_pECDY6aB_w0/SecdvTElj5I/AAAAAAAAF3o/m31N2zqri3g/s400/potholes.jpg


Ralphy

Last edited by Ralphy (8/07/2012 1:48 pm)

 

8/07/2012 6:34 pm  #78


Re: The Chevrolet IRS picture thread

 

9/05/2012 9:50 pm  #79


Re: The Chevrolet IRS picture thread

Street Shop Inc. C4 Billet Rear
http://www.streetshopinc.com/images/billet_rear/_AAP9831_main.jpg

http://www.streetshopinc.com/billet_rear.html


Street Shop Inc.
C5 and C6 Suspension
for your 1953-1982 Corvette
http://www.streetshopinc.com/images/c5c6/Main_Street_Shop_Inc_c5_c6.jpg

http://www.streetshopinc.com/c5andc6for53-82.html


Repalcement 1953-1982 Corvette Chassis by Street Shop Inc.
http://www.youtube.com/watch?v=rP_gF-fSrbg&feature=related

Last edited by Ralphy (9/05/2012 9:56 pm)

 

9/10/2012 6:40 am  #80


Re: The Chevrolet IRS picture thread

I found this at the Vettemod board.
Thank You Vettemod and Groovyjay.

Evolution Of The 5-link Suspension For The C3 Corvettes
http://www.registryofcorvetteracecars.com/five-link-evolution.pdf

Pics, 6 pages
http://corvetteregistry.smugmug.com/Cars/Five-Link-Suspension/24901149_4ZKtjG#!i=2039250463&k=FfwX9LB

http://corvetteregistry.smugmug.com/Cars/Five-Link-Suspension/i-2w88jRT/0/M/14-Guldstrand-5-link-System-M.jpg


I came across more images of Guldstrand's RPF 5 link design. It may appear the trailing links are not equal length but I think they are. It also appeared the coilover is being used and not the leaf spring.
http://img.photobucket.com/albums/v349/72redvette/Keiths%20car/keith77car.jpg

http://img.photobucket.com/albums/v349/72redvette/Keiths%20car/keith77car010.jpg

http://forums.corvetteforum.com/c3-tech-performance/2707888-installing-a-guildstrand-5-link.html

More Pics
http://www.malinmotors.com/projects/c_suspension/images/suspension2a.jpg

http://www.malinmotors.com/projects/c_suspension/images/suspension13.jpg

http://www.malinmotors.com/projects/c_suspension/c_suspension.html

Ralphy

Last edited by Ralphy (9/10/2012 10:10 pm)

 

9/12/2012 5:02 am  #81


Re: The Chevrolet IRS picture thread

1969 TVR Tuscan V6 Race Car with a C3 carrier. From Britishracecar.com

Bind?
http://www.britishracecar.com/MichaelZappa-TVR-Tuscan/MichaelZappa-TVR-Tuscan-DA.jpg

http://www.britishracecar.com/MichaelZappa-TVR-Tuscan/MichaelZappa-TVR-Tuscan-DG.jpg

http://www.britishracecar.com/MichaelZappa-TVR-Tuscan.htm

Last edited by Ralphy (9/12/2012 5:04 am)

 

9/12/2012 1:45 pm  #82


Re: The Chevrolet IRS picture thread

OH - you almost got me on that one Ralphy!
Its a, "Chevrolet Corvette quick change rear end with limited slip differential."  Gee, I didn't know that's what I have too.

- the upright is also Custom, but a welded Aluminum Upright.  Very nice however.  Nice Slip yoke half shafts too. 

Cheers - Jim

Last edited by phantomjock (9/12/2012 1:47 pm)


UNDERCONSTRUCTION! Highly Modified C3 Corvette
         Dual Wishbone IRS w Subframe + Custom Uprights
 

9/12/2012 1:52 pm  #83


Re: The Chevrolet IRS picture thread

I don't know about any bind but I'd be worried about shearing off those wheel studs as there are only four.  If the goal was to cruise and have some fun on a light weight car, four might do the job.  But on most any other application, it is just a matter of time before he leaves a tire.

It's funny to watch as long as the driver comes out fine.

 

9/12/2012 5:23 pm  #84


Re: The Chevrolet IRS picture thread

I forget who/manufacture made the uprights. They may be Triumph. TVR did use other manufactures parts.The quick change statement?
http://www.tvrblog.com/tvr-tuscan-5-4-litre-the-brian-hough-tragedy/


TVR Tuscan, Mid Ohio 2011 SVRA
http://www.youtube.com/watch?v=IYWNMkbI7AQ

http://media.photobucket.com/image/1969%20tvr%20tuscan%20for%20sale/JAYPLAY28/TVR%2520Tuscan4/P1070713.jpg

Last edited by Ralphy (9/12/2012 5:31 pm)

 

10/25/2012 6:47 pm  #85


Re: The Chevrolet IRS picture thread

 

4/14/2013 3:49 am  #86


Re: The Chevrolet IRS picture thread

Original Guldstrand C2/C3 conversion. It's also for sale
http://www.vettemod.com/forum/showthread.php?t=9341
http://www.vettemod.com/forum/imagehosting/135169995c02801.jpg
http://www.vettemod.com/forum/imagehosting/135169995c5293a.jpg

Last edited by Ralphy (4/14/2013 3:50 am)

 

6/21/2013 4:07 am  #87


Re: The Chevrolet IRS picture thread

Here's a neat Sub Frame on a 60s Custom vette.  Uses the Jag components in a billet milled subframe:
http://i40.tinypic.com/ta3sd3.jpg



Another view:
http://i43.tinypic.com/atls9f.jpg


And the builder was clever enough to follow through on the FRS as well:

http://i44.tinypic.com/minh9e.jpg


Well thought out and designed suspension sustem - well integrated components including coil overs, Rack and Piniion, etc:
http://i42.tinypic.com/10x4ry8.jpg


These last 2 could be in the FRS thread as well - but thought nice fit here too.
Cheers - Jim


UNDERCONSTRUCTION! Highly Modified C3 Corvette
         Dual Wishbone IRS w Subframe + Custom Uprights
 

10/13/2013 6:22 am  #88


Re: The Chevrolet IRS picture thread

Here are some Dimensions I'm trying to source - been all over the web and these are hard top find - it is the C5/C6:
http://i43.tinypic.com/29w0lkj.jpg

ANy help VERY Much Appreciated! 
Cheers Jim


UNDERCONSTRUCTION! Highly Modified C3 Corvette
         Dual Wishbone IRS w Subframe + Custom Uprights
 

1/20/2014 7:36 pm  #89


Re: The Chevrolet IRS picture thread

Jim the rear is actually a quick change.


phantomjock wrote:

Here's a neat Sub Frame on a 60s Custom vette.  Uses the Jag components in a billet milled subframe:
http://i40.tinypic.com/ta3sd3.jpg



Another view:
http://i43.tinypic.com/atls9f.jpg


And the builder was clever enough to follow through on the FRS as well:

http://i44.tinypic.com/minh9e.jpg


Well thought out and designed suspension sustem - well integrated components including coil overs, Rack and Piniion, etc:
http://i42.tinypic.com/10x4ry8.jpg


These last 2 could be in the FRS thread as well - but thought nice fit here too.
Cheers - Jim

 

 

5/03/2015 10:42 am  #90


Re: The Chevrolet IRS picture thread

I've been looking for some Gen 5 differential dimensions as shown

 

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