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Independent Rear Suspension Forum » Trailing arm suspension upgrade help » 11/11/2017 3:40 am

phantomjock
Replies: 8

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This type would attach to the end and give you both length and some toe adjustment possibilities.
https://www.currieenterprises.com/CE-9114

Note they have teh specs available to size the threaded end you've shown in the pics. 

For while you're at it - maybe the U-joints and bearings checked?  The half shafts are part of the suspension and they will be critical - just like a 'vette with TAs.

Cheers - Jim
 

Independent Rear Suspension Forum » Trailing arm suspension upgrade help » 11/08/2017 2:15 pm

phantomjock
Replies: 8

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http://cdn.boardhost.com/emoticons/grin.png
  Hah- ha - that is funny!  If you poke around here - you'll find my "Jim's Giovanni" - it has the Currie johnny joints mod in the TAs.

Cheers - Jim

 

Independent Rear Suspension Forum » Trailing arm suspension upgrade help » 11/08/2017 3:21 am

phantomjock
Replies: 8

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Ahhh - pictures - well done - and these explain well too. 

Very similar to the Corvette Rear Trailing Arm setup.  Although a much more severe angle here.  A popular mod on the 'vette is the Johnny Joint.  here is a good how-to:  http://www.vettemod.com/forum/showthread.php?t=2315  mind you, they're not cheap - but rock crushers believe in them!  Stronger than a heim or Rose Joint, but similar action.
Basically, the joint goes in the trailing arm, and not the chassis mount.  That way any articulation is compensated for in the TA. 

You can also replace the bolt/pin with a drilled greased version to help keep it lubed.  Those are popular with 4x4 off road folks - so you know they're strong-as.

Good luck - keep us "posted"

Cheers - Jim

Independent Rear Suspension Forum » Trailing arm suspension upgrade help » 10/31/2017 3:06 am

phantomjock
Replies: 8

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Looks like you've hit the"magic" 3 on your posts - should be able to load pics now.  Looking forward to seeing them. 

Here's the "How-2"
http://irsforum.boardhost.com/viewtopic.php?id=3

Cheers - Jim

Front Suspension Discussion and Tech » Manual or Power Rack and Pinion? » 10/23/2017 2:43 am

phantomjock
Replies: 6

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Just a couple of quick ideas.  Believe I've seen power steering setup with an accessory pump.  Can't speak to cost - but doubt it is at 8HP.  Also if it is already "twitchy" may not want to try a "Quickener" or such item.  https://content.speedwaymotors.com/ProductImages/91032203_R_908bb5b3-fcc1-4e79-8eac-e3316eb717d4.jpg

Available from circle track outfits - Speedway, Lefthander, etc.
Cheers - Jim

Independent Rear Suspension Forum » To bush or not to bush an IRS? » 8/28/2017 2:39 am

phantomjock
Replies: 2

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Great solution - looks like some nice "kit" potential. 

Cheers - Jim

Independent Rear Suspension Forum » Is there any reasonably priced software for assessing an IRS design? » 8/06/2017 2:42 am

phantomjock
Replies: 3

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I'll add the following;
https://www.racingaspirations.com/apps/suspension-geometry-calculator/

You can subscribe for ad-free and it works well.  Has now included Scrub Radius the many other simpler models do not.
Speed-Wiz has been making steady improvements and even a smart phone app now I recall. 
http://www.speed-wiz.com/
Now it includes intake header cacls and much more

Vsusp is at: http://vsusp.com/

Not associate with any of the above products - just a user...

Cheers - Jim

Independent Rear Suspension Forum » MN12 IRS in '68 Cougar » 8/04/2017 4:28 pm

phantomjock
Replies: 10

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Looks like its coming together - Careful with that wrist!  You Know "Murphy!."

Cheers - Jim

Independent Rear Suspension Forum » Is there a way to assess IRS geometry without software? » 7/16/2017 2:18 am

phantomjock
Replies: 3

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rficalora wrote:

I'm thinking learning geometry & the formulas is beyond me so I'm wondering whether there are services that:
a) given various measurements, will provide back the info about camber (& toe if any) changes throughout the suspension travel
b) make recommendations for what to change to improve the IRS

I'm asking because I have an IRS that someone else made (I got no specs on it) & I had to modify to make it fit my car so changed it anyway.  Net, I have no idea what it's doing and want to because I want to change a few more things.  I'm thinking 1st step is figure out what it's doing currently & then make my modifications incorporating recommended changes from the analysis.
 

Yes - It is called a "String Computer."  It was developed by Allan Staniforth.  There are freeby computer approaches - see my thread elsewhere.  This one is online - free just need to sign up for it;
https://www.racingaspirations.com/
Pics are always good!
Cheers - Jim

Independent Rear Suspension Forum » Is there any reasonably priced software for assessing an IRS design? » 7/10/2017 11:42 am

phantomjock
Replies: 3

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Sorry you didn't get a reply -- I am "in and out"  but here is a thread that might be helpful...

http://irsforum.boardhost.com/viewtopic.php?id=263

Cheers - Jim
 

Independent Rear Suspension Forum » The aftermarket IRS picture thread » 12/13/2016 3:16 pm

phantomjock
Replies: 93

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Nick_P wrote:

Interesting site but wow, so little activity.  Anyone here like the new IRS from AME

Welcome - and get that second post in so you can add pics!  I personally am in and out on an infrequent basis.  Will restaert my Corvett project next season.  This year I get/have to move my sailboat from South East Asia to South Africa  - so have been busy with getting that all ready.

Ask away any questions you might have - but be patient - I think many members are otherwise "engaged," like me and drop in from time-to-time. 

Cheers - Jim
 

Independent Rear Suspension Forum » seeking (rear) roll center ideas . . . . » 10/25/2016 9:36 am

phantomjock
Replies: 1

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thedude -
"...just dropped in to see what condition my condition was in..."
That is a longish wheelbase - but the C4 corvette at 98 inches runs just at 3 inches front and double (+) that on the rear at 6 1/2 inches as I recall. 

Any hints as to the body style?  A Stutz Bearcat (120" was the shorter version)  - or something from the League of Incredible Gentlemen?

Hope you post a pic or two.

Cheers - Jim
 

Independent Rear Suspension Forum » Baseline set up » 5/21/2016 2:16 am

phantomjock
Replies: 6

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Greetings - welcome aboard!  That is a cool looking project.  Level is a good place to be starting for the 1/2 shafts at ride height.  Be sure and check out some of the links I've posted that will help do the diagram/planning for you. 
There is no specific discussion on pinion angle as I recall - but there is a good bit of discussion on drive shafts and angle.

Looks cool - very cool.  Are you on Lateral-G or Pro-Touring too?  Might be some interest there in your ride too.

Cheers - Jim

Independent Rear Suspension Forum » 2005 GTO IRS » 9/25/2015 1:43 pm

phantomjock
Replies: 11

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Good Luck on that!  I tend to take my pause with a beer in the afternoon and refocus...http://cdn.boardhost.com/emoticons/grin.png

I bet downstream you'll end up using the couple 100 bucks you saved!  Ain't "hot-rodding" FUN?

Cheers - Jim

Independent Rear Suspension Forum » 2005 GTO IRS » 9/21/2015 3:32 pm

phantomjock
Replies: 11

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A while back I posted a thread that was on the "bits and Pieces" - or something like that.  There are a number of hex tube and swedged tube manufacturers that might be enough for your MOD.  The dirt track and circle track folks use a lot of that and really put it to the test.

Here is that link:
http://irsforum.boardhost.com/viewtopic.php?id=260

The total project is here:
http://vettemod.com/forum/showthread.php?t=10667
I started with some rightous - I mean LARGE DOM and threaded it rather than do the weld in bungs.  MAN what weight.  I've since gone to oversize AL hex Tubes. Haven't run it yet.

RE:  Halfshafts.  will you have enough end-play to accomodate any  suspension movement (in and out)? 
I had some slip shafts built for my Corvette project - much doccumented here - and on Vettemod.com   Have since gone to CV axles - less weight and rotational mass.
Here's the 'vette link :
http://irsforum.boardhost.com/viewtopic.php?id=490



Cheers - Jim

Independent Rear Suspension Forum » 2005 GTO IRS » 9/21/2015 2:24 am

phantomjock
Replies: 11

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Welcome Aboard! 
I note the forum has been kinda' slow form some of the frenzy pitch we had a while back.  http://cdn.boardhost.com/emoticons/grin.png


There is a great deal of info here and folks that have built their IRS like you're planning. 
There are a number of other options to using DOM and welding bungs to make your corntol arms - but those will certainly work! 
You'll be at the threshold of submitting pics - be sure and post some.  [I am overdue on my project - and better do some too.]

Cheers - Jim
 

Independent Rear Suspension Forum » Jag brake kits http://jheengineering.com/ More Useless Copy and Paste » 7/31/2015 2:25 am

phantomjock
Replies: 3

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Hey Jim - Long time no hear.  Hope you've been well.
Just saying HI!  A lot for me to post and catch up on.

Cheers - Jim

Independent Rear Suspension Forum » Other Manufacturers of the center section (differential) for C4's » 6/27/2015 2:23 am

phantomjock
Replies: 1

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Welcome aboard.   I'm sorry to say I won't be much help on the C4 question - you piqued my interest and had no luck on google either.  Hope someone chimes in to offer assistance.  Have you tried any of the corvette forums;  Vettemod and Digital Corvettes?   Good luck Geo!

Cheers - Jim

Independent Rear Suspension Forum » C4 Corvette IRS install help » 4/30/2015 2:31 am

phantomjock
Replies: 3

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MRGJNV wrote:

Another question I have is the angle of the dog bones. I see that the top link is supposed to be 6.2 degrees up. Since the CG is going to be higher than that of the Vette, I was thinking of installing them at about 10-12 degrees. The attachment to the frame would be much cleaner looking raised up a bit.

One thing you'll be "messing with there" is the Anti-Squat.  Could give you some characteristics you may not like - or maybe not.  Would bneed some analysis.
http://www.vettemod.com/forum/showthread.php?t=327

Cheers - Jim

Independent Rear Suspension Forum » C4 Corvette IRS install help » 4/30/2015 2:28 am

phantomjock
Replies: 3

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Greetings and Welcome Aboard!

Sorry I'm not a C4-guy so can't answer that for you.    Here are a few from a search iover at the VetteMod site - may help - but to virew pics you'll need to sign up. 

http://vettemod.com/forum/search.php?searchid=247470&pp=25&page=3

A very helpful and friendly "Mob" over there too.

Cheers Jim
 

Front Suspension Discussion and Tech » C4 Upper A Arms » 4/21/2015 2:19 am

phantomjock
Replies: 1

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There are a fair number of users over at vettemod.com that have used C4 control arms and rear "batwings" on their C3 Corvettes.  You might take a look over there and see if you have any "joy".  BTW if you become a member there you can use the downloads and there are some C4 suspensiion CAD files available.

Good Luck.
Cheers - Jim

Independent Rear Suspension Forum » ride height » 12/22/2014 3:26 am

phantomjock
Replies: 1

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Welcome aboard! 

You'll find the most common answer is level

However in the Corvette world, Greenwood (renowned Corvette performance guru) says to measure from the ground to the center of the outer and inner half shaft attachment points and there should be 1/2" difference. With the differential being the highest measurement of the half shaft.  Do this is with weight on the 4 wheels, and ride height set. [Preferably with 1/2 fuel load and driver's weight in seat.]

I'll add the "why" of this approach.  With the half shafts angled down from the differential, the Toe Angle of the rear suspension  goes more negative before it starts going more positive. Positive Toe Angle is unstable and no fun to drive. If you start with the halfshafts above horizontal then you will be moving toward positive toe at an increasing rate. Starting with the half shafts pointed down, not the case.

Hope that helps!  Post pics when you get to that "magical 3 posts."

Cheers - Jim

Independent Rear Suspension Forum » IRS UPRIGHTs » 11/30/2014 4:03 am

phantomjock
Replies: 62

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Over the past few years there has been a minor movement to DIY/CNC manufacturing of Alumiinum Billet Uprights.  The nice part about some of the designs, they can be modular and assebled rather than welded saving on fabrication, and easing manufacturing complexity.  This is a set built by a fellow who is building a Formula 1000.  Ok it weighs between 1000-1400 pounds wet, but the DIY work was done without a CNC as I understand.

Cheers - Jim
http://i58.tinypic.com/2ldu73b.jpg

Independent Rear Suspension Forum » Jag IRS into C3 worth the trouble? » 11/07/2014 3:49 am

phantomjock
Replies: 4

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tyrellracing wrote:

Gee I thought I was the only one here that keeps my shiny car parts in my living room. .... She claims they reproduce.LOL

Yep!  Started with the intake manifold and webers on the fireplace mantle, then a few interior parts, now the complete interior, and the IRS bits from above.  Add a rear wing, crank timing gears, a transmission cable, and so it goes. 
She's accused me of building a car in the living room - go figure?
 

Independent Rear Suspension Forum » Jag IRS into C3 worth the trouble? » 11/04/2014 4:08 am

phantomjock
Replies: 4

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Firebird - welcome aboard!
Sorry I can't answer the jag questions -- but theis is the right place. 
However, I'll jump in as a Vette-Mod Maniac... No mines here Richard!!!http://cdn.boardhost.com/emoticons/happy.png


I built a Giovanni-like Set Up - you can find it here on the site (url follows), google, or over @ vettemod.com - I use the  same handle there, phantomjock.

The Govanni is a HUGE improvement over the standard C3 IRS.  Yes, the C3 is an IRS, but the trailing arm suspension has its own set of quirks that leaves a lot of room for improvement.  Having owned my C3 for over 35 years, autocrossed and autobahned, I became well familiar with its quirks. And, I'm sure the jag IRS would be an improvement - but not without some manufacturing/mod efforts.   

You can see the difference on the curves on my build thread @ http://irsforum.boardhost.com/viewtopic.php?id=490   Similarily, the road test report I've posted there attests to the much improved handling and streetability for this approach.

My Giovanni set up uses a dual mount composite transverse leaf, and the bushings in the TAs have been replaced with sphericals, so the motion is smoother and much improved.  Parking brake is moved to the top of the TAs. 
Two aluminum plates lower the lower cross member for better geometry on the lower control arm. 

The setup includes 2 safety loops as well, all (or most) of the necessary small bits and pieces for the upper and lower control arms.  I had all the welding done to the rear differential crossmember and it is part of the package too.  The diff crossmember mounts with aluminum pucks instead of rubber/poly discs so much improved road contact as well. 
The spindles were rebuilt all new bearings by VanSteel, and they powdercoated the TAs as well. There is always a concern regarding the in/out motion of the half shafts and wear and tear on the differential.  I opted for slip shafts that were built by Chris Taton who

Independent Rear Suspension Forum » Custom IRS » 10/20/2014 2:51 am

phantomjock
Replies: 31

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Here is a quick link to GrabCad - There are some control Arms and Upright in the database:
https://grabcad.com/library/corvette-c5-control-arms-1

Cheers - Jim

Independent Rear Suspension Forum » Custom IRS » 10/18/2014 2:18 pm

phantomjock
Replies: 31

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Sorry, I'm a little to join the party, but Ralphy has a wealth of information available - and terrylracing has a lot of experience to offer as well as many others here.  For all things IRS - this is the place!

I have been working with the C5/6 uprights in my suspension design for my track/race car for the past few years.  Maybe I can offer a point or 2 you might find useful.
1. The geometry of the pick up points on the frame from C5 to C6 are the same, the uprights and control arms as well (As I all my research has found.)
2.  Also, they are the same from base C6 to C6Z06. We'll have to assume that for the ZR1.  Have you a source for those?  May be just different materials - not design.  I understand that is the difference with the stock vs Z06.
3.  Suspension Analyzer V2.4 has a 2001 vette file in its library (C5). Because the position of the pick up points is the same, you can use that information to locate the control arm pivot points and balljoints if that fits your need.
4.  When you start your build, unfortunately, you'll need to do some work on the uprights to get them to be useful - GM didn't make the Ball Joints replaceable - that is why you see them on eBay. There are approaches you can use, I've posted mine here on this site, as well as vettemod.  I post there as phantomjock. 
I have some dimensions - somewhere - I'll look.http://cdn.boardhost.com/emoticons/grin.png


Cheers - Jim
 

Independent Rear Suspension Forum » Hi, I have two IRS projects to work out. » 8/02/2014 6:15 am

phantomjock
Replies: 77

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Richard/SIA wrote:

A step forward always seems to be followed by a step back!
... So now I have more design thoughts to ponder before I can complete my install.
Looks like I will be lowering my rear static ride height too for several reasons.


Going to have to clean-sheet of paper this, one more time. http://cdn.boardhost.com/emoticons/errr.png

At least my basic mounting scheme still looks good to me.

Boy - do I hear that!  Been round and round - but finally settleing in on my projo.  I'm way behind on posting - but will get some this weekend when it rains...

Cheers - Jim
 

Independent Rear Suspension Forum » Lower shock mount & more » 7/13/2014 3:57 pm

phantomjock
Replies: 1

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Welcome Aboard! Fellow Vette Owner!  Another Frame-Off SLAVE!!http://cdn.boardhost.com/emoticons/grin.png
Mine a 78 - original owner.

Where are you on the front end?  Just starting - or deep in to it?  Looking at Coil Overs - or a mono-spring?  I did A mono-spring (Vette Brakes or VanSteel- can't remember)  with SPC upper Control Arms and extended Howe Ball Joints.  I have a few books to recommend (in fact, may be listed elsewhere here.)  Also a few software programs to help (and confuse) you on teh IRS.

I will shortly be selling my Giovanni Rear Suspension I built.  It is a respectable bit of hardware - Dual Mount rear monospring, takes the half shafts out of the load equation, slip fit half shafts, etc, etc.

If you haven't yet checked in @ vettemod.com great source for all things corvette - especially as you are making MODS!   [Some sites don't think we should mess with these cars!]
Also I suggest you engine/tranny/rear end questions are perfect for grumpyperformance.com.  Grumpy is all over 'vettes and a heap of experience in answering such questions - or already answered there.

Now, my set up (becoming a Track car/racer/sometime street) is a 383 - somewhere around 450HP/420ft#.  Mated to a 200r-4 (Bowtie Stage II) that I've reset as a Full Manual/Reverse transmission - so it is now basically a clutchless manual transmission.  I have upped the Torque Converter to 2800 RPM.  The rear differential is a 4.11 Tom's with maximum splines (I forget how many).   
Just now diddling with the steeting etc - and firewalls.  You'll have fun! 

Welcome aboard again!  When you hit the "magic" number of posts -- add some pictures!

BTW - Your setup sounds close and reasonable.
Cheers - Jim
 

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