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Oct 29, 2021 10:22:04 GMT
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How is it October already?
Tbh next to nothing has happened for a while, as I've been moving house and re-decorating! I've thrown the car back together as much as possible so it can be transported to my new place within the next few weeks, but I don't expect I'll have much to update on this year.
I'm currently saving my pennies for painting the shell next spring, and should be back at it in the new year.
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Hello hello.. with it being 2022 now I thought I'd post a quick update of how things are going. The car is in my new garage now, which is lovely. The money I'd had earmarked for paint has unfortunately had to buy a new boiler, which isn't so lovely, but such is life! I thought I'd start getting on with the design work in the meantime, as there's plenty to be done. I've done a quick half model FEA on the front subframe to see how feasible the design is. This is nothing fancy, just a quick sheet model to look for any obvious problem areas that need re-thinking or refining. No bolt loads, welds, or anything like that, just a symmetrical model attached to some fixed rigid bodies to assess the overall structure.  A stress plot shown below:  Aside from some artificial hot spots from a lack of weld modelling, it's not looking so bad. I'm not particularly interested in weld detail right now anyway.. what this does very nicely is show how the structure is flexing and highlights any obvious areas that can be improved. So it's a decent starting point.. from here I'll add some reinforcements to certain areas and play around with thicknesses to reduce some of the more serious hot spots. With any luck I'll update this a bit more frequently now that things are a bit more settled. |
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Hello again, I've been busying myself with a bit of a re-work of how the side rails are constructed, to try and smooth out some of the higher stress areas. Instead of having folded sections welded together I've gone for a more swoopy section made up of separate sheets - a bit more of a fiddle to assemble but still pretty straightforward.  This has some doublers in places to stiffen up around the wishbone loads - particularly the rear bracket, which is very highly loaded. The half model was looking decent enough:  So I constructed the full model and used some remote loads for things like steering and ARB, as those brackets are still TBD.  I'm happy enough with it now that I can work out the remaining brackets for steering, engine mounts, ARB etc, and then do some final runs. All going well I should be able to get building one fairly soon! |
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Jan 31, 2022 10:27:55 GMT
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This is fascinating to read thank you. Back in the day I had access to several 205 and 309 Gti's and a mate had a 205 gti with the turbo technics conversion - all a lot of fun! I do however recall the 309 had much nicer handling and was less prone to lift off oversteer - was this down to having a wider rear track? Pretty sure the tyre of choice was the original Bridgestone RE71 in 195/50/15 flavour.
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Last Edit: Jan 31, 2022 10:30:00 GMT by dadstaxi
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Jan 31, 2022 13:33:59 GMT
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Yeah I think slightly more rear end weight and wider track made them a bit less.. spinny.. than the 205's
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teaboy
Posted a lot
Make tea, not war.
Posts: 2,125
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Jan 31, 2022 21:41:26 GMT
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Yeah I think slightly more rear end weight and wider track made them a bit less.. spinny.. than the 205's I think that the longer wheelbase would have had a greater impact on this than the slight difference in track. |
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Yeah I think slightly more rear end weight and wider track made them a bit less.. spinny.. than the 205's I think that the longer wheelbase would have had a greater impact on this than the slight difference in track. Yes you're right - I had assumed they shared the same wheelbase. So probably all of the above! |
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Great to see this project moving ahead again!
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