DIY Subframe bracing?
#1
DIY Subframe bracing?
Anyone who has taken their engine out or done a diff swap. Have you thought of or done any diy bracing to them?
I've got mine out now and am interested in welding some bar's onto them or plate to box in/triagulate certain areas.
I'll be taking some pictures of mine tonight for refference but has anyone had any ideas?
I've got mine out now and am interested in welding some bar's onto them or plate to box in/triagulate certain areas.
I'll be taking some pictures of mine tonight for refference but has anyone had any ideas?
#8
i have a good friend who is a talented welder, has done all my past welding work on my cars.
I was figuring something like a permanent cannon brace, get rid of the tubular ladder bars in the back and make a one piece square framed ladder bar.
I'm just not sure if there is any way to brace the front subframe (engine cradle?* or re-enforce it while its out.
I guess making an L bracket to bolt this to the tranny would work
http://store.summitracing.com/partde...0&autoview=sku
I was figuring something like a permanent cannon brace, get rid of the tubular ladder bars in the back and make a one piece square framed ladder bar.
I'm just not sure if there is any way to brace the front subframe (engine cradle?* or re-enforce it while its out.
I guess making an L bracket to bolt this to the tranny would work
http://store.summitracing.com/partde...0&autoview=sku
#9
The problem with making your own subframe bracing is not the welding but the forces passing through the welds. I would find someone who had a waterjet or CNC mill. Through it in autocad and get it made. Then sell it to people.
If you do put it in Autocad, or draw it out by hand I can model it for you in a few minutes. I can also run it through Mechanica and optimize it.
If you do put it in Autocad, or draw it out by hand I can model it for you in a few minutes. I can also run it through Mechanica and optimize it.
#10
thats way too advanced for me at the moment. I dont have the software for that, i can do a drawing in paint with the measurments but thats about it.
Also no one on island has that kind of equipment lol
i was planning on making some frame rails like FM's....basically its just some sheet steel with 4 bends in it, i might be able to get holes drilled and chamfered as well.
Also no one on island has that kind of equipment lol
i was planning on making some frame rails like FM's....basically its just some sheet steel with 4 bends in it, i might be able to get holes drilled and chamfered as well.
#13
Loki...using Mechanica or some other FEA-based program to optimize would be great, but only if you know the loads being put onto the thing. If you can accurately determine the loads by yourself, you've got yourself a job with any auto company. Any "optimization" is based solely on a specific loading. Since a car is under arbitrary dynamic loading, it takes a lot more brain-power to "optimize" than to throw it into Mechanica. I think you're over-simplifying part design.
#14
Heres a good write-up. Just click the next button to scroll through.
http://www.miata.net/hakuna/0007/h0001.htm
http://www.miata.net/hakuna/0007/h0001.htm
#16
Of course engineering involves simplification. But we only do it in the absence of accurate information. Much better to get data when possible.
I'm currently working on my Phd in structural engineering, mechanics and materials. One of my office-mates is doing his entire dissertation about effective, lightweight chassis-bracing schemes. He's doing some really cool stuff, but it is way more involved than it seems at first glance. I wish he were using a Miata, but it isn't exactly an archetype chassis.
Some of his general conclusions are that it is much more effective to avoid bending in braces, and design them to be in tension (duh), or concede to the fact that you never truly know the loading.
Bent-tube braces are great for "get'er done" type diy braces to get rid of certain bad dynamic characteristics. But be careful...placed incorrectly and you can get some other weird things happening...
I'm currently working on my Phd in structural engineering, mechanics and materials. One of my office-mates is doing his entire dissertation about effective, lightweight chassis-bracing schemes. He's doing some really cool stuff, but it is way more involved than it seems at first glance. I wish he were using a Miata, but it isn't exactly an archetype chassis.
Some of his general conclusions are that it is much more effective to avoid bending in braces, and design them to be in tension (duh), or concede to the fact that you never truly know the loading.
Bent-tube braces are great for "get'er done" type diy braces to get rid of certain bad dynamic characteristics. But be careful...placed incorrectly and you can get some other weird things happening...
#19
im doing a motorsport engineering degree and i understand some of what your friend is doing but not to that degree obviously.
all help is welcome
i never intended to use flatened round tubing like mazda. what i wanted to do was make a rectagular tubed ladder frame with everything welded together then bolted to the underside using all the existing holes
all help is welcome
i never intended to use flatened round tubing like mazda. what i wanted to do was make a rectagular tubed ladder frame with everything welded together then bolted to the underside using all the existing holes