Citroën ZX Optima Mid LWB Rally

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Re: Citroën ZX Optima Mid LWB Rally

Post by j0pp3 »

Great to know about the bumper! It's the best candidate so far. I also checked the scale car body mount set but the mounting posts might be a bit short for a Citroën body. At least for the rear. I will get back to this when I have measured the height needed.

Thanks for all the input!
Cheers
Joel

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Re: Citroën ZX Optima Mid LWB Rally

Post by EvolutionRevolution »

j0pp3 wrote:Thank you EvolutionRevolution! The bumper you are using, does it fit the Optima Mid without any modification? I have only seen it on models based on Ultima.
You need part number OR-46.

There's also a later bumper that fits all Optima, Lazer, and GP-10 cars and that has a better design.

For the body posts, you can try Kyosho Spider part 92322, which has adjustable body mounts.

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Re: Citroën ZX Optima Mid LWB Rally

Post by j0pp3 »

Alright! The later version you mentioned, may it be OR-29?

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Re: Citroën ZX Optima Mid LWB Rally

Post by keithrc »

I've just posted up some pics of my F40 project in my Optima Mid thread.

http://www.rc10talk.com/viewtopic.php?f=30&t=29489&p=325034#p325034


Keith :wink:

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Re: Citroën ZX Optima Mid LWB Rally

Post by EvolutionRevolution »

j0pp3 wrote:Alright! The later version you mentioned, may it be OR-29?

Cheers
No. You can see it on my Lazer ZX-R Mk II here.

Unlike OR-46, it won't bend down (and eventually break) when you hit something.

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Re: Citroën ZX Optima Mid LWB Rally

Post by Incredible_Serious »

Watching this thread with interest... as I have a Citroen body somewhere (I think, haven't seen it since I moved!). Those SI-12 body accessory parts are like golden rocking horse doo-doo to find.... I think mine will be a road version if I ever build it.....

As an aside, I'm just finishing the rebuild (finally) of my Kyosho Celica GT-Four (original pictures here: http://www.tamiyaclub.com/showroom_model.asp?cid=40949&sid=154), which is Lazer-based rather than Optima-based. Not bad, seeing as it needed a rebuild in about 2006.... once I'm finished I might have to create a thread for it too. Then we can all work out what body I should put on it, as the original is basher-fine, but pretty much toast for anything else.

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Re: Citroën ZX Optima Mid LWB Rally

Post by j0pp3 »

Incredible_Serious wrote:Watching this thread with interest... as I have a Citroen body somewhere (I think, haven't seen it since I moved!). Those SI-12 body accessory parts are like golden rocking horse doo-doo to find.... I think mine will be a road version if I ever build it.....

As an aside, I'm just finishing the rebuild (finally) of my Kyosho Celica GT-Four (original pictures here: http://www.tamiyaclub.com/showroom_model.asp?cid=40949&sid=154), which is Lazer-based rather than Optima-based. Not bad, seeing as it needed a rebuild in about 2006.... once I'm finished I might have to create a thread for it too. Then we can all work out what body I should put on it, as the original is basher-fine, but pretty much toast for anything else.

Alex
Nice. I remember those rally models that were based on Lazer Alpha. I think I have a Kyosho mini catalog where a few of them are presented.

/j0pp3
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Joel

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Re: Citroën ZX Optima Mid LWB Rally

Post by j0pp3 »

Sunny weather in Stockholm today so I got a few parts done with the Dremel. Optima mid front tower and a Slingshot rear tower plus front/rear suspension plates. I'm not sure a Slingshot tower will work as I want but I want to try it. The Optima Mid tower I used as a template was modified with extra holes that don't even line up but I didn't realize that until the tower was finished... Right now it's no big deal as I will try different shock setups anyway.

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Re: Citroën ZX Optima Mid LWB Rally

Post by j0pp3 »

Another update. After some testing I decided to use the slingshot tower in the front instead. It makes it possible to get a good suspension geometry with shocks laying down. It is also a bit lower than the standard Mid tower which may help with body positioning later on. Don't worry, I will fix the negative camber angle. The front suspension plate seems to work fine.

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Re: Citroën ZX Optima Mid LWB Rally

Post by j0pp3 »

Got some more time spent on this project! :mrgreen:

I ignored my first idea of having short shocks in the rear as the long shocks gets a better mounting position after all. As in the front, the rear shocks are mounted in the hubs and I found out that they can be mounted in the gearbox if they are fitted behind the wishbones. As you may suspect the rear hubs are placed backwards.

Rushed it a bit and just had to try the wheels on even if the car lacks rear turnbuckles and dog bones all around :lol:

Next on the list is to craft a matching top deck.

Image
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Re: Citroën ZX Optima Mid LWB Rally

Post by Coelacanth »

Interesting project, j0pp3...looks like you're trying to go as low-profile as possible, judging by how you're mounting your shocks. I love the simplicity in the design of the Optima Mid series' chassis. The original Optima is a nice chassis but can be a real bear to work on.
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Re: Citroën ZX Optima Mid LWB Rally

Post by j0pp3 »

Yes, I'm aiming for a low profile this time as it seems to fit these kind of cars. I'm going to craft a shock tower just to be able to attach the rear body mounts. Mounting the body will take a bit more work than usual because it already has holes (adapted for the original Raider chassis). I will solve it anyway but the holes will "control" how the mounting setup is arranged. I have found some vintage mounting posts that almost looks like those included in monster truck conversion kits. Might give them a try as they feel sturdy. The rear part of the body is relatively high compared to other onroad cars so the mounting posts have to be put higher than normal.
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Re: Citroën ZX Optima Mid LWB Rally

Post by j0pp3 »

Some more parts made. You might ask why I chose to copy a Rear Plate (L) adapted for a mechanical speed control and the answer is that I only have that version in metal. I prefer copying metal parts because it's so much easier to follow the contour without hurting the original part too much :D

Image

Next update will show an almost complete roller!

See ya soon...
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Joel

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Re: Citroën ZX Optima Mid LWB Rally

Post by Coelacanth »

You might want to modify that rear plate to cut down on unnecessary weight. I did something similar to the attached image, cutting out the unnecessary triangular section in my own Mid SE build because it serves no purpose without an MSC. That and a bit of grinding/filing to round the edges and it'll weigh less and be just as strong.
PartMod.jpg
PartMod.jpg (6.66 KiB) Viewed 879 times
PartMod.jpg
PartMod.jpg (6.66 KiB) Viewed 879 times
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Re: Citroën ZX Optima Mid LWB Rally

Post by j0pp3 »

Cutting weight is good. Thanks for taking your time illustrating the modification. I'll fix it tomorrow!

Cheers
Cheers
Joel

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