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sierra uprights

gavin174 - 19/10/08 at 08:15 PM

i am planning on using sierra uprights on the locost..

i have got sierra locost wishbones from casarva, transit drag links,maxi ball joints,and sierra uprights reamed for maxi balljoint...

my question is how do i know where to weld the suspension brackets..

thanks in advance

gavin174 - 23/10/08 at 05:34 AM

has no one else used sierra uprights

or is it a secret...

mr henderson - 23/10/08 at 06:59 AM

Get the Haynes Roadster book. That design uses the Sierra uprights and has full detail and dimensions of how to make the necessary jigs.

John

gavin174 - 26/10/08 at 05:50 PM

got the front end "finished" today..

had to graft in new front end as all measurements were wrong on the chassis i bought..

need to get the engine and box in now and look at ordering shocks to get the geometry right on the front....
Rescued attachment DSCF0879.jpg

mr henderson - 26/10/08 at 06:07 PM

quote:
Originally posted by gavin174
got the front end "finished" today..

had to graft in new front end as all measurements were wrong on the chassis i bought..

need to get the engine and box in now and look at ordering shocks to get the geometry right on the front....

Shocks aren't going to put the geometry right if it isn't already. How did you decide the wishbone bracket placement?

Is that the picture, or are you running a LOT of positive camber there?

John

Echidna - 26/10/08 at 06:16 PM

A lot of positive camber and quite bad trackrod angle too.

gavin174 - 26/10/08 at 09:26 PM

the photo was taken with 8" ground clearance and no weight in engine bay...

the steering rack angle will improve when the front end is lowered ..

and the camber was not set.

mr henderson - 26/10/08 at 09:27 PM

How did you decide the wishbone bracket placement?

gavin174 - 27/10/08 at 04:24 PM

made up a mdf jig to hold the two wishbones and upright ..

positioned it on the chassis and welded the front brackets on and then welding in the upright for the rear upper bracket...

mr henderson - 27/10/08 at 06:46 PM

quote:
Originally posted by gavin174
made up a mdf jig to hold the two wishbones and upright ..

positioned it on the chassis and welded the front brackets on and then welding in the upright for the rear upper bracket...

Yes, but what was the source of the dimensions for the jig?

gavin174 - 27/10/08 at 07:12 PM

i didnt do the job myself. i used the fabricator who built my race cars for me

he measured the distance of the top and bottom wishbone bushes..

and allowed for the lay back of the upright.

then compared this to the haynes roadster set up.. and hey presto..

i hope.. do you think i have done something wrong

mr henderson - 27/10/08 at 07:36 PM

quote:
Originally posted by gavin174

then compared this to the haynes roadster set up.. and hey presto..

i hope.. do you think i have done something wrong

If the dimensions have worked out the same as the Haynes Roadster then I'm sure all will be well. The rack will need to be the correct length, of course

John

gavin174 - 27/10/08 at 07:39 PM

the rack lengthvseems to be ok..

i have set it up with 10 threads inside the track rod end....

obviously need to wait till engine in and shocks fitted to get true idea..

mr henderson - 28/10/08 at 01:47 PM

quote:
Originally posted by gavin174
the rack lengthvseems to be ok..

i have set it up with 10 threads inside the track rod end....

obviously need to wait till engine in and shocks fitted to get true idea..

I think the idea of the correct rack length is that the target is to get the ball joints at each end of the rack itself in line with the upper and lower brackets, and the track rod ends in line with the upper and lower balljoints on the upright. IIRC this is the situation where the least bump steer occurs.

John

Syd Bridge - 28/10/08 at 07:42 PM

quote:
Originally posted by mr henderson
How did you decide the wishbone bracket placement?

Buy yourself a copy of each of the Staniforth books. Seems everyone here uses them and believes every word they read.

Cheers,
Syd.

Lord Charles - 28/10/08 at 08:07 PM

quote:
Originally posted by Syd Bridge

quote:
Originally posted by mr henderson
How did you decide the wishbone bracket placement?

Buy yourself a copy of each of the Staniforth books. Seems everyone here uses them and believes every word they read.

Cheers,
Syd.

Seen this "Syd"?

Syd Bridge - 28/10/08 at 08:29 PM

And what is your 'everyday' posting name on here, Lord Charles? Seeing as your last post was in 2003.

If anyone is a cesspit stirrer, then it is your good self!

Cheers,
Syd.

[Edited on 28/10/08 by Syd Bridge]

MK chippy - 28/10/08 at 10:48 PM

oo handbags!