LocostUSA.com

Found this video(he has more episodes) and I thought to share it here.
https://www.youtube.com/watch?v=vZARRcd3_Yc

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Tibor


'20 Alfa Romeo Stelvio daily
Locost/442E in progress

Nice video, but the laser bump steer measurement would also show camber change. The spindle/upright vertical travel is in an arc that would muddy the water when all you are looking for is toe change.

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Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS viewtopic.php?f=5&t=13225&p=134742
Simple Spring select viewtopic.php?f=5&t=11815
LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12

That’s a common oversight when using the laser method. There’s more than a few videos giving the same poor advice.

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Midlana book: Build this mid-engine Locost!, http://midlana.com/stuff/book/
Kimini book: Designing mid-engine cars using FWD drivetrains
Both available from https://www.lulu.com/

So how it is supposed to be done?

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Tibor


'20 Alfa Romeo Stelvio daily
Locost/442E in progress

Coilover removed, chassis supported at ride height, toe set to zero with a laser mounted across the tire bulges or the rim lip at a height near the wheel center. The distance to the chassis centerline via outer rail adjacent to the wheel and as far along the chassis as possible (both references should be equal) for a laser parallel to the chassis. Raise the wheel in bump. If the laser beam is still parallel to the chassis centerline, there is no bump steer in that position. The laser can be replaced with jack stands and twine pulled taught across the far tire bulge and adjusted with the other jack stand to where the string barely touches the other side wall bulge.

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Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS viewtopic.php?f=5&t=13225&p=134742
Simple Spring select viewtopic.php?f=5&t=11815
LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12

Here's my non-laser method. The aluminum angle mounted to the hub is the same as my approximate tire diameter. The wood steering rack fixture is marked so I can easily document for and aft positioning and I can adjust the height with shims to dial it in. I was hoping to get away without shortening my rack, but with a stock Spitfire rack, at 2" of bump or droop, I get a pretty significant toe change, so I'm going to shorten it after all.

I'm cutting 9.125" from my NC rack. Rack is done(cut and re-threaded), I need to do the body next, and extenders, M14x1.5 to 12x1.25.
Nice setup.

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Tibor


'20 Alfa Romeo Stelvio daily
Locost/442E in progress

I did find some interesting ideas in that video even if his technique isn't 100% correct. It looks like my garage floor has about the standard 2% grade in it. I think those adjustable leveling stands look like a fairly practical way to overcome that issue.

Cheers,

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Damn! That front slip angle is way too large and the Ackerman is just a muddle.

Build Log: viewtopic.php?f=35&t=5886

I have the same slope. I had to add 1" at the front of the car's chassis to keep it leveled.

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Tibor


'20 Alfa Romeo Stelvio daily
Locost/442E in progress