hi ive mounted my diff in this plate ive made at work its all 3mm do you think it will be ok when its welded to the bottom of my track car.or do you think it will bend
adam

IMO it will flex, but as to wether that's a problem or not I couldn't say. If there was a brace/cross bar between the front two longer bits that'd make it much stiffer.

Not sure how it's going to mount in your car but IMO its going to bend. I agree a cross bar would help and weld another strip at 90 degrees onto the existing ones.

Geoff

It'll bend when you give it the beans...
So unless you're going to be very gentle with this new car I'd re-inforce it....

will it be welded to the floor pan of the car? if so it mite do

would be better if the mount points were made of thicker steel or preferably if they were angle or channel, as for the base plate if its fully welded to the car would be fine as is probably but id personally want to add some diagonal strips on the plate between the brackets to prevent twist and maybe add a few bolts as well in middle or weld to stop the middle area lifting and stretching away from the floor pan

[Edited on 21/5/07 by goodall]

Surely it will bend? The twisting forces as you hit the gas in first will fold the long arm I would have thought?
Are you mounting the diff upside down or hanging this plate under the floor?

Look at the way MK, GTS and other do it much simpler all loads carried in sheer .

ive just offered it up to the bottom of the car to see what its like.do you rekon it would be ok if i put some braces to the long arms off the boot floor. the floor seems very thin i think i might have to run some box section across it
adam


[Edited on 21/5/07 by oadamo]

weld a piece of angle joining the two (four altogether) vertical brackets together, that way (at least) both of those will be suppirted and as they should be in conflict with each other in a twisting sense that should in theory be like a double reinforcement(?)

also I would use angle instead of flat so that it imposed a certain amount of 90degree force into your bracket in general!

Steve

This sort of thing mkight help, obviously the long straps are the real problem, the short ones less so, but still think it may needd more suport if your going to be giving it large
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If you make the front arms out of 3mm x 25mm angle you'll get rid of most of the twist. Then add a X brace of flat strip across the forward facing edge and it should be ok.
And yes, you're right about the boot floor. Being a saxo it was never designed to take any real force, so a few bits of box from the outer sills and so on to create a frame wikll go a long way towards not twisting the rear end.

just out of interest adam how are the de dion mounts going to be connected to the car? as you will probably have to make a bit of frame work on the car to take up the force from it as well and this frame work could be used to also mount the diff, just like a sub frame

ive made some box things like on the 4 link kits for the mk2 escorts. but i havent made the arms yet to fitting them. iam still waiting for the bushes do arrive then i can make the arms to suit the size of the bushes. iam still learning and sort of making it as i go along lol.the problem i have is trying to get it all to fit without cutting half of the car away
adam

yes i understand how it could be very difficult fitting all that in there, my dad and me often think of converting are audi gt in to a quattro and it would require us cut the whole transmission tunnel and rear floor out so i can see all the complications you must face

i think your biggest concern would be spreading the load onto the body well enough to prevent the body cracking at the pick up points for the axle and the diff and the welding on the diff mount you have made looks superb

looken good so far cant wait to see the pics of her when you finish

Weld a piece of box between the front two and some angle to the sides of the two side ones and drill through the original holes. Bolt it up to the boot floor with a couple of 5mm spreader plates between the bolts to sandwich the floor
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