GT40s.com
MK-I  MK-II  MK-III  MK-IV  GULF  MIRAGE  J-CAR  LOLA
GT40s.com
Home Forum Gallery Support GT40s.com  
Register FAQ Advertisers Search Today's Posts Mark Forums Read

Go Back   GT40s.com > >

Notices

Wings, Wheels, and Keels Assorted discussions and build projects

Reply
 
Thread Tools Display Modes
Old 28th December 2016, 11:28 PM   #1
CousinVinny's Avatar
CousinVinny
Rookie
United States
 
Join Date: Dec 2012
Location: New York USA
GT40: Mercedes CLKGTR
Posts: 33
Starting my GTR chassis build

Hello to everyone here. I'm laying out my chassis for my scratch build Mercedes CLK-GTR Tribute street car and need advice on tube sizes as I want it to be strong but not too over built. I plan on using round tube for what will make up the 2 main roll bar hoops at the windshield A-pillar and B-pillars and their overhead connectors. Note: the doors will hinge forward off the A-pillars. I am considering 1.5'' or 2'' round tube in 11 or 13 gage. The remainder of the chassis will consist of square tubing 1.5'' x .060 (40x40x1.5mm) with secondary supports from 1''x1'' x .060 (16ga) 26x26x1.5mm.
The cars specs:
Audi 2.7ltr V6 bi-turbo 240HP
Boxster 012 5 speed
Corvette c5 susp & brakes all around
100'' / 2.55cm wheelbase
Target weight 2300lb/1043kg
.
Any advise on choice of tubing is greatly appreciated, If I may have left out something critical needed just ask. I look forward hearing back from fellow members and starting to build this dream car of mine. All the best, Vinny

Below are a drawing and photo of the actual race car. I'm not building a monocouque as the original, instead I will clad the lower half of the tube framed cabin with aluminum skin.
Attached Thumbnails
Starting my GTR chassis build-chassis-jpg   Starting my GTR chassis build-chassis2-jpg  

Last edited by CousinVinny; 20th April 2018 at 07:02 PM.
CousinVinny is offline   Reply With Quote
Old 10th January 2017, 06:04 PM   #2
CousinVinny's Avatar
CousinVinny
Rookie
United States
 
Join Date: Dec 2012
Location: New York USA
GT40: Mercedes CLKGTR
Posts: 33
Re: Starting my GTR chassis build

Any advise on choice of tubing is greatly appreciated, If I may have left out something critical needed just ask. I look forward hearing back from fellow members and starting to build this dream car of mine. All the best, Vinny
CousinVinny is offline   Reply With Quote
Old 11th January 2017, 06:20 AM   #3
kaspa's Avatar
kaspa
10 tenths
Australia
 
Join Date: Apr 2008
Location: Maroochydore QL
GT40: i wish
Posts: 1,099
Re: Starting my GTR chassis build

Vinny, 40x40 x 1.6 will be fine for the main chassis rails, that's all ive used on numerous GT40 chassis ive done and my McLaren with 25 x 25 x1.6 diagonals.

Now your roll hoops, I think you will find if you intend to take it near a track you want the cage to be FIA compatible which will mean main hoops of 44 x 2.5 wall CDS [cold drawn seamless tube] of 350MPA min requirement,
the diagonals can be 38 x 2.5 CDS also 350MPA min,
remember its your neck so do it once and do it right, and you'll have no problems down the track
look forward to seeing it all come together
cheers John
__________________
Steinard F5000 Steinard LMP Steinard M1B
kaspa is offline   Reply With Quote
Old 11th January 2017, 12:09 PM   #4
blueovalz's Avatar
blueovalz
Skinny Man
United States
 
Join Date: Aug 2008
Location: Arkansas
GT40: An orange car
Posts: 2,111
Re: Starting my GTR chassis build

John,

Help me understand the MPa. Is this what you guys use for tensile or shear strength values?
__________________
Terry


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
blueovalz is offline   Reply With Quote
Old 11th January 2017, 02:22 PM   #5
russell keach's Avatar
russell keach
4 Tenths
New Zealand
 
Join Date: Jul 2013
Location: newzealand
GT40: Mclaren M8b rep
Posts: 413
Re: Starting my GTR chassis build

Vinny

I am building a McLaren M8B as a road car and have gone a little stronger than John and my previous track car and used 40mm x40m x2mm, now that may be overkill but side impact is exceptionally strong with the only week point being going under the vehical in front.
All my bracing is 25mm sq x 1.6mm tube and some areas like dash surrounds is 19mm sq x 1.6mm.
My set up will be a lexus 1uz 4ltr V8 running thru what i hope will be an Audi transaxel with around 280hp.
I plan on the car being under 1000kg as the stronger chassis would only add around 30 to 40 kg n weight.
Like John, happy to help with any questions on scratch build stuff.
Cheers
Russell
My brother has purchased a tranaxel in the states and currently its sitting in the boot of his new Plymouth Wildcat some where between USA and NZ so i am nervously waiting to see what he got me....should see it in a couple of weeks
russell keach is offline   Reply With Quote
Old 11th January 2017, 05:11 PM   #6
kaspa's Avatar
kaspa
10 tenths
Australia
 
Join Date: Apr 2008
Location: Maroochydore QL
GT40: i wish
Posts: 1,099
Re: Starting my GTR chassis build

Hi Terry, MPA is the international measurement of tensile strength of steel.

cheers John
__________________
Steinard F5000 Steinard LMP Steinard M1B
kaspa is offline   Reply With Quote
Old 11th January 2017, 05:17 PM   #7
molleur's Avatar
molleur
Bronze Supporter
United States
 
Join Date: Mar 2008
Location: Florida
GT40: SL-C LS1/930LSD
Posts: 7,091
Re: Starting my GTR chassis build

Here 'ya go Ox,
1 megapascal [MPa] = 145.03773773 psi [psi]
__________________
Happily deplorable!

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
molleur is offline   Reply With Quote
Old 11th January 2017, 10:20 PM   #8
blueovalz's Avatar
blueovalz
Skinny Man
United States
 
Join Date: Aug 2008
Location: Arkansas
GT40: An orange car
Posts: 2,111
Re: Starting my GTR chassis build

Yeah, I saw some references to MPa and PSI as pressure, but then it came to me that this could be shear or tensile strength as well...duh.
__________________
Terry


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
blueovalz is offline   Reply With Quote
Old 11th January 2017, 10:36 PM   #9
CousinVinny's Avatar
CousinVinny
Rookie
United States
 
Join Date: Dec 2012
Location: New York USA
GT40: Mercedes CLKGTR
Posts: 33
Re: Starting my GTR chassis build

John, Thank you for posting the sizes on the tubing, I've written it in my notebook and will be calling the local steel supplier to see what he has to offer up, and they should have the equipment to bend my roll hoops too.
.
Russell, I was glad to read you and John were using similar size tubing, I had begun drawing my frame in 1.5'' square tube and now feel confident to stay with that size. I work a few evenings per week as a graphic artist as it keeps my creative side active and has led me to learn Google SketchUp to draw in 3D.
I hope your brother has something Stuttgart flavored for you, not too many FWD Audi's here in the states. When I picked up my Boxster trans (2002 EFD from a 2.7 car)I was surprised to see cost-cutting parts like using a plastic sleeve on the throwout bearing, and a plastic Slave cylinder. But those are easily upgraded.
,

I greatly admire the skill of everyone here, and I aspire to make this car better than my last one. Thanks for taking the time to reply.
Cheers,
Vinny

Last edited by CousinVinny; 11th January 2017 at 10:45 PM.
CousinVinny is offline   Reply With Quote
Old 12th January 2017, 12:29 PM   #10
CousinVinny's Avatar
CousinVinny
Rookie
United States
 
Join Date: Dec 2012
Location: New York USA
GT40: Mercedes CLKGTR
Posts: 33
Re: Starting my GTR chassis build

When I opened my email this morning I discovered I had won an auction for a Corvette C5 rear suspension assembly. It's complete rotor to rotor minus the diff. It's a 2 hour drive to pick it up which will likely happen next week. It's a good day. Cheers Vinny
CousinVinny is offline   Reply With Quote
Old 13th January 2017, 02:45 PM   #11
CousinVinny's Avatar
CousinVinny
Rookie
United States
 
Join Date: Dec 2012
Location: New York USA
GT40: Mercedes CLKGTR
Posts: 33
Re: Starting my GTR chassis build

Quote:
Originally Posted by CousinVinny View Post
When I opened my email this morning I discovered I had won an auction for a Corvette C5 rear suspension assembly. It's complete rotor to rotor minus the diff. It's a 2 hour drive to pick it up which will likely happen next week. It's a good day. Cheers Vinny
Another bit of good news, also got an ebay note this afternoon saying I was the winning bid for a complete front suspension and rack pulled from an 87 Corvette. Should be a busy upcoming week. Cheers Vinny
CousinVinny is offline   Reply With Quote
Old 13th January 2017, 09:33 PM   #12
Lambo's Avatar
Lambo
2 Tenths
New Zealand
 
Join Date: May 2006
Location: NEW ZEALAND
Posts: 237
Re: Starting my GTR chassis build

Hi Vinny G , you and others might find this link useful LocostUSA.com • View topic - Torsion Constants of Tubing
Lambo is offline   Reply With Quote
Old 17th January 2017, 10:01 AM   #13
CousinVinny's Avatar
CousinVinny
Rookie
United States
 
Join Date: Dec 2012
Location: New York USA
GT40: Mercedes CLKGTR
Posts: 33
Re: Starting my GTR chassis build

Hello Graeme, that's a terrific link you posted. It will be very helpful. Thank you.
.
.
Both suspension assemblies are here now. They are 1987 C4 front and 2001 C5 rear (Corvette).
CousinVinny is offline   Reply With Quote
Old 17th January 2017, 10:07 AM   #14
CousinVinny's Avatar
CousinVinny
Rookie
United States
 
Join Date: Dec 2012
Location: New York USA
GT40: Mercedes CLKGTR
Posts: 33
Re: Starting my GTR chassis build

Some pics here.
Attached Thumbnails
Starting my GTR chassis build-download-jpg   Starting my GTR chassis build-_1-jpg  
CousinVinny is offline   Reply With Quote
Old 19th January 2017, 07:25 PM   #15
CousinVinny's Avatar
CousinVinny
Rookie
United States
 
Join Date: Dec 2012
Location: New York USA
GT40: Mercedes CLKGTR
Posts: 33
Re: Starting my GTR chassis build

I've managed to get up the courage to post my chassis in progress pictures. As this evolves I hope to improve it with each new version. Please consider giving advice on tube placement and all areas that need additional reinforcement so far. I value everyone's vast knowledge on this forum and look forward to reading all replies.
- The colors indicate:
Blue Square tube = 1.5'' / 38mm
Green round tube = 1.75'' / 44mm
yellow square tube = 1.0'' / 25mm
.
Thank you very much,
Cheers! Vinny
Attached Thumbnails
Starting my GTR chassis build-chassis-jpeg-jan192017-jpg   Starting my GTR chassis build-chassis-jpeg-jan192017-1-jpg   Starting my GTR chassis build-chassis-jpeg-jan192017-2-jpg   Starting my GTR chassis build-chassis-jpeg-jan192017-3-jpg  
CousinVinny is offline   Reply With Quote
Old 20th January 2017, 03:51 AM   #16
kaspa's Avatar
kaspa
10 tenths
Australia
 
Join Date: Apr 2008
Location: Maroochydore QL
GT40: i wish
Posts: 1,099
Re: Starting my GTR chassis build

Hi Vinny whats your E mail address and ill send you a couple of chassis pic to give you a guide to work from.

cheers John
__________________
Steinard F5000 Steinard LMP Steinard M1B
kaspa is offline   Reply With Quote
Old 20th January 2017, 09:29 AM   #17
CousinVinny's Avatar
CousinVinny
Rookie
United States
 
Join Date: Dec 2012
Location: New York USA
GT40: Mercedes CLKGTR
Posts: 33
Re: Starting my GTR chassis build

Thanks John, pm sent.
Cheers
Vinny
CousinVinny is offline   Reply With Quote
Old 28th January 2017, 10:51 PM   #18
CousinVinny's Avatar
CousinVinny
Rookie
United States
 
Join Date: Dec 2012
Location: New York USA
GT40: Mercedes CLKGTR
Posts: 33
Re: Starting my GTR chassis build

I was able to spend a couple of hours in the garage today, so I broke down the Corvette rear suspension into left and right assemblies on rolling dollys to make them easier to move around. Thanks to John for jumping on with advice on chassis design, its a great help to have guidance from more experienced builders. I'm working on establishing the rear track width using the outer corvette CV and shaft, and looking at Porsche 930 inner cv's. The Porsche cv's have the correct 28 inner splines to match the Corvette shaft. I will then need a pair of larger 108mm- 6 bolt Audi-VW axle flanges to replace the Boxster transmission's 100mm parts. My other option if the Porsche cv's won't work is custom axles.
Cheers
Vinny
Attached Thumbnails
Starting my GTR chassis build-c50-rear-dolly-jpg  
__________________
There's always next year.....

Last edited by CousinVinny; 28th January 2017 at 11:01 PM.
CousinVinny is offline   Reply With Quote
Old 7th February 2017, 09:16 PM   #19
CousinVinny's Avatar
CousinVinny
Rookie
United States
 
Join Date: Dec 2012
Location: New York USA
GT40: Mercedes CLKGTR
Posts: 33
Re: Starting my GTR chassis build

Ordered the Porsche 930 inner cv's today. I took apart the corvette axle beforehand to confirm that the splines on the shaft were indeed 28 count. still trying to locate a pair of VW axle flanges to match the 930 cv's. -Vinny
__________________
There's always next year.....
CousinVinny is offline   Reply With Quote
Old 8th February 2017, 11:14 AM   #20
CousinVinny's Avatar
CousinVinny
Rookie
United States
 
Join Date: Dec 2012
Location: New York USA
GT40: Mercedes CLKGTR
Posts: 33
Re: Starting my GTR chassis build

Terry, just came across your post in Udo's MB6 build thread. I'm going down a similar path with the 930 cv's and was glad to hear you're having success running without c-clips on your axles. This is great news and will give me additional options. Thanks for sharing your experience. Cheers , Vinny
__________________
There's always next year.....
CousinVinny is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

 
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

Forum Jump


All times are GMT -4. The time now is 08:01 PM.