It is currently Fri Mar 29, 2024 6:46 am




Post new topic Reply to topic  [ 34 posts ]  Go to page 1, 2, 3  Next
GTM Coupe Special 
Author Message
GTM delivered

Joined: Sat Nov 16, 2013 7:36 pm
Posts: 19
Location: Germany
GTM: Cox/Coupe
Post GTM Coupe Special
Everything startet with a 1985 GTM Coupe without engine.
Attachment:
File comment: My GTM when I purchased it.
001.JPG
001.JPG [ 506.82 KiB | Viewed 31929 times ]



The car had to be converted to left hand drive and needed more than just a new engine. The interior was in a bad state, exept the seats. It was equipped with sunroof and a bit or rust at the sills.

I startet with the roof and thought a slightly more curved roof would suit the GTM. Therefor I used a mould I had made a long time ago, using the rear half of a Mini roof panel. After laminating the roof segment I had to cut it into two parts and fixed it with some glue. At a later stage I will have to glass it in correctly.
After the roof I started modifying the rear end to accept Ford Cortina MK-I rear lights.
Attachment:
002.JPG
002.JPG [ 215.87 KiB | Viewed 31929 times ]
Attachment:
003.JPG
003.JPG [ 238.46 KiB | Viewed 31929 times ]
Attachment:
004.JPG
004.JPG [ 216.72 KiB | Viewed 31929 times ]
Attachment:
005.JPG
005.JPG [ 172.45 KiB | Viewed 31929 times ]



On the last picture you can see the BF-Torino "Silverstone" seat I will like to use and a first attempt for positioning the steering.
Attachment:
006.JPG
006.JPG [ 244.72 KiB | Viewed 31929 times ]


dietmar


Sat Jun 21, 2014 3:48 pm
Profile E-mail
Admin, and Coupe Nutter
User avatar

Joined: Fri Sep 14, 2007 10:34 pm
Posts: 1762
Location: In the workshop
GTM: Cox/Coupe
Post Re: GTM Coupe Special
Welcome to the forum, I see we have GTM in Germany now! interesting mod making the roof more curved.

Neil

_________________
IF wile e coyote had a GTM he would have one with Nitrous too! watch out road runner! The First GTM into the 11s then the 10s, PB 10.87 @ 125.5 Mph on A048 tyres, and fully road legal at Santa Pod


Sat Jun 21, 2014 5:21 pm
Profile
GTM delivered

Joined: Sat Nov 16, 2013 7:36 pm
Posts: 19
Location: Germany
GTM: Cox/Coupe
Post Re: GTM Coupe Special
There is at least one GTM Coupe road registered in Germany:

Image

There is also a Rossa MK-I Road registered.


Sat Jun 21, 2014 7:25 pm
Profile E-mail
Admin, and Coupe Nutter
User avatar

Joined: Fri Sep 14, 2007 10:34 pm
Posts: 1762
Location: In the workshop
GTM: Cox/Coupe
Post Re: GTM Coupe Special
I had forgotten about that one I knew it was in Europe somewhere.

Neil

_________________
IF wile e coyote had a GTM he would have one with Nitrous too! watch out road runner! The First GTM into the 11s then the 10s, PB 10.87 @ 125.5 Mph on A048 tyres, and fully road legal at Santa Pod


Sat Jun 21, 2014 8:55 pm
Profile
GTM delivered

Joined: Tue Nov 13, 2007 4:36 pm
Posts: 47
Location: Peak District
Post Re: GTM Coupe Special
That roof looks perfect, the standard flat roof has always looked odd to me.


Sat Jun 21, 2014 10:05 pm
Profile
GTM delivered

Joined: Sat Nov 16, 2013 7:36 pm
Posts: 19
Location: Germany
GTM: Cox/Coupe
Post Re: GTM Coupe Special
I didn't like the use of the Mini bumper, so I tried to use a Lotus Elan front bumper. After fitting the mid section of the Elan bumper and bending the bonnet to fit properly, I thought why not using the front skirt of the elan, too. It still needs a lot of work, but I like it.
Attachment:
010.JPG
010.JPG [ 145.65 KiB | Viewed 31865 times ]
Attachment:
009.JPG
009.JPG [ 169.13 KiB | Viewed 31865 times ]



The steering is in position, and the pedal box is getting modified to suit this special usage. You can also see a very early design stage of what my dashboard should look like.
Attachment:
007.JPG
007.JPG [ 205.32 KiB | Viewed 31865 times ]
Attachment:
008.JPG
008.JPG [ 200.67 KiB | Viewed 31865 times ]


Mon Jun 23, 2014 12:18 pm
Profile E-mail
GTM delivered

Joined: Sat Nov 16, 2013 7:36 pm
Posts: 19
Location: Germany
GTM: Cox/Coupe
Post Re: GTM Coupe Special
After some other work, I recently started working on my Coupe again.

At some point I decided to try something completely new. Making a lightweight chassis using honeycomb and carbon fiber. To be honest I have never build a chassis for a car, but making a more lightweight and stiffer one compared to the original chassis shouldn't be that difficult.
That's one reason why I called it Special, there are some more special things to come.

I also had some thoughts about the engine...

Attachment:
File comment: Carbon/Honeycomb floorpan
_MG_4063_k.jpg
_MG_4063_k.jpg [ 65 KiB | Viewed 29857 times ]

Attachment:
File comment: Carbon/Honeycomb front bulkhead
_MG_4062_k.jpg
_MG_4062_k.jpg [ 86.59 KiB | Viewed 29857 times ]

Attachment:
File comment: trial fitting the first panels
_MG_4061_k.jpg
_MG_4061_k.jpg [ 96.38 KiB | Viewed 29857 times ]

Attachment:
File comment: some minor changes to the front subframe
_MG_4060_k.jpg
_MG_4060_k.jpg [ 96.81 KiB | Viewed 29857 times ]

Attachment:
File comment: Carbon fiber window frame and glass reinforcement for the door skin. Changed to Mini door lock.
_MG_4059_k.jpg
_MG_4059_k.jpg [ 72.54 KiB | Viewed 29857 times ]

Attachment:
File comment: altering and reinforcing the door cards
_MG_4058_k.jpg
_MG_4058_k.jpg [ 81.19 KiB | Viewed 29857 times ]

Attachment:
File comment: dashboard
_MG_4057_k.jpg
_MG_4057_k.jpg [ 93.6 KiB | Viewed 29857 times ]


Fri Feb 03, 2017 8:57 pm
Profile E-mail
Admin, and Coupe Nutter
User avatar

Joined: Fri Sep 14, 2007 10:34 pm
Posts: 1762
Location: In the workshop
GTM: Cox/Coupe
Post Re: GTM Coupe Special
:mrgreen: :mrgreen: :mrgreen: :mrgreen:

I am Jealous

I have been wanting to do a Honeycomb chassis for ages, I was looking at doing an aluminium version. I have it roughly drawn out!

Looks good. Be interesting to see how the elan front turns out.

Neil

_________________
IF wile e coyote had a GTM he would have one with Nitrous too! watch out road runner! The First GTM into the 11s then the 10s, PB 10.87 @ 125.5 Mph on A048 tyres, and fully road legal at Santa Pod


Fri Feb 03, 2017 9:04 pm
Profile
Part built GTM

Joined: Tue Feb 23, 2016 11:14 pm
Posts: 52
Post Re: GTM Coupe Special
Love the look and idea of the honeycomb chassis. Your other ideas are also looking like modernising a great we car.
I am looking at doing something similar with a K3, see the post in the K3 section, and would love more details on how you did yours.
How light did it end up?
How stiff do you recon it is compared to the steel?
I am planning on replacing the front and rear sub frames with separate box sub frames, I recon I can loose a substantial amount of weight.


Fri Feb 03, 2017 9:33 pm
Profile E-mail
GTM delivered

Joined: Sat Nov 16, 2013 7:36 pm
Posts: 19
Location: Germany
GTM: Cox/Coupe
Post Re: GTM Coupe Special
techead wrote:
Love the look and idea of the honeycomb chassis. Your other ideas are also looking like modernising a great we car.

Well in the end you won't be able to tell if the car has a steel or carbon fiber chassis, as it will be painted completely. Here in Germany we have the so called "H" number plates, which are for historic cars (that are in a good and original state).
So everything I change has to be more ore less invisible or period style tuning including the frontend, rear lights, dashboard, engine, wheels, ...

Quote:
How light did it end up?

My main goal is to prove that it can be done and getting experience for doing the same thing for other car projects. I think it will be less than 30Kg, but at least 3 times stiffer than the steel one.

Quote:
I am planning on replacing the front and rear sub frames with separate box sub frames, I recon I can loose a substantial amount of weight.

Why not using the titanium ones made by Carl Austin (Force-Racing)? I would love to use them but I can't as they are not period style.


Fri Feb 03, 2017 9:58 pm
Profile E-mail
GTM delivered

Joined: Wed Feb 08, 2012 11:53 pm
Posts: 31
Location: Poland
GTM: Cox/Coupe
Post Re: GTM Coupe Special
Yuppie, next LHD coupe :)


Fri Feb 03, 2017 10:22 pm
Profile E-mail
GTM delivered

Joined: Sat Nov 16, 2013 7:36 pm
Posts: 19
Location: Germany
GTM: Cox/Coupe
Post Re: GTM Coupe Special
There was another mod I did. I did't like the look of the headlamp rim, so I completely redesigned the Headlamp area to use standard 7" Mini headlamp rims. I'll post a picture soon.


Fri Feb 03, 2017 10:36 pm
Profile E-mail
Part built GTM

Joined: Tue Feb 23, 2016 11:14 pm
Posts: 52
Post Re: GTM Coupe Special
Force racing sub-fame looks amazing, but way to expensive for the car. I would need 2.
I am also looking at possible changes to drive and suspension as well and they may force compromises to be made.
Going back to your carbon honeycomb. Did you buy the sheets pre-made then join them to make the floor and bulk heads or did you lay them up yourself?
I can get my design to be almost flat panelled and a pre-made sheet would speed up the production. What spec of materials did you use? I am at present designing a mould and thinking of using grp honeycomb and other high tech materials to make the suspension tubs as I like to call them.


Sat Feb 04, 2017 10:47 am
Profile E-mail
GTM delivered

Joined: Sat Nov 16, 2013 7:36 pm
Posts: 19
Location: Germany
GTM: Cox/Coupe
Post Re: GTM Coupe Special
If I try to sum up the material and time I need to make the chassis, the Force Racing parts are quite cheap.

All sheets are made by myself with different layup and honeycomb thickness. The next parts I'm going to make need moulds to be made. So it's even getting more expensive.

All Carbon sheets are made using vakuum infusion to get the best quality possible.


Sat Feb 04, 2017 4:20 pm
Profile E-mail
GTM delivered

Joined: Sat Nov 16, 2013 7:36 pm
Posts: 19
Location: Germany
GTM: Cox/Coupe
Post Re: GTM Coupe Special
Finally I managed to make the mould for the sills. I took some pictures while making the first of my carbon fibre honeycomb sills.

Attachment:
20.jpg
20.jpg [ 155.27 KiB | Viewed 28831 times ]

The outer carbon fibre structure which was made using vacuum infusion.

Attachment:
21.jpg
21.jpg [ 165.65 KiB | Viewed 28831 times ]

Preparing the honeycomb.

Attachment:
22.jpg
22.jpg [ 189.56 KiB | Viewed 28831 times ]

Glueing in the honeycomb using vakuum.

Attachment:
23.jpg
23.jpg [ 244.41 KiB | Viewed 28831 times ]

The honeycomb is in its desired place, now it's time to prepare the inner carbon layup.

Attachment:
24.jpg
24.jpg [ 175.83 KiB | Viewed 28831 times ]

Everything is done, now the resin will cure under vacuum pressure. Tomorrow the first sill is ready to be trial fit to the other chassis parts. I'm curious about the weight.

I also did some measurements where to put the seats, gear lever and handbrake to make the reinforcements needed. Getting the desired stainless steel tube (35x1mm) for the water rail inside the tunnel isn't that easy.


Sat Jul 15, 2017 7:11 pm
Profile E-mail
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 34 posts ]  Go to page 1, 2, 3  Next


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © phpBB Group.
Designed by Vjacheslav Trushkin for Free Forums/DivisionCore.

phpBB SEO