Lonnie-S wrote:There is an assumption that everyone reading this thread might know what "zero Ackerman" or "200% Ackerman" might mean. I don't. Does anyone care to define those terms?
Picture below... left car is 100%, right car is 0%, 50% would be half-way between. Move the intersection point to half of the wheelbase and you would get 200%.
This article was a good read. My car drives the way the article concludes… at 100% my car is VERY 'pointy' (especially so at high speeds). I'm more of a technical and low speed (autocross) driver so this is desired for my use. https://www.vehicledynamicsinternationa ... viour.html
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davew wrote:" Ackerman is the same as a Chevy S10." The S-10 came in three wheelbases and used the same spindle on all three. Plus the S-10 spindle was a carry-over item form the older GM "B"-cars. So there had to variation with the WB changes but the spindle designed in Ackerman was consider sufficient for a lot of different WB's. Plus to add to the comments, the Pratt-Miller Vettes run as high as 200% Ackerman on some tracks. As long as you are in the ballpark, because it would be hard to say one size fits all!
Also, I don't think any s10 with 2wd spindles had a rack and pinion, just 4wd. Converting to a rack changes whatever it was with a steering box linkage. The popular stalker steering arm shortening changes it further.
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
If you are going to be using a trammel bar to check toe at different steering angles, just be aware that the tire gets in the way unless you make really long pointers on the trammel bar. Also, set your toe before checking as toe-in means you are starting with negative Ackerman and toe-out means you are starting with positive Ackerman,
A VERY general guideline I heard years ago is that the inside wheel should turn 23* when the outside is 18*. Obviously car width, length and intended use can affect this but it gives a frame of reference. I picked up commercial grade turn plates years ago on craigslist for $50.
