Ackerman on the 22

[dbizzle5]

Has anyone worked out a way to increase the ackerman on the 22?

The front outside wheel wen turning has way to much lock and is almost parrallel with the inside wheel.

This problem I think is the main problem with the 22 causing it suddenly hook during the corner as soon as you come off the power and the weight transfers forward. Ive tried everything else setup wise to try and compensate for this but nothing really solves it.

Just wondered if anyone had worked out a way to solve this as I cant!

[Frecklychimp]

Agree totally dude, thats why the rear end loses traction... there is nothing but inline or trailing Spindles to adjust steering.

Have seen Ellis Stafford on another car use carbon plates mounted where ballstuds go on spindles to give extra options, but with the steering on 22 being linear it will be hard to get anything to work ratio side to side wise like a radial bellcrank steering system operates.

I was chatting to Tom from Akula and we worked out that it would be possible to fit rear pivoting bellcrank steering on the chassis as there is enough room once rack is removed and there are posts to use as pivot points i you remove the plastic tapered sleeves... just need someone handy enough to make the parts!

When my 3D AutoCAD drawing of 22 is completely finished i'll be able to play with the design.... but its been 6mths so far cos it takes forever when doing half hour at a time.

[Frecklychimp]

Actually just wondering if curved turnbuckles/links would be able to give it a different Ackermann ratio enough to help?

With it having linear steering reaction, unless you change the toe in/out drastically it will be hard to get different response with wheels side to side against each other.

I'll get some graph paper out and the calculator and have a play... good fun engineering!

[dbizzle5]

haha! youre a much cleverer man than me! lol If this cud get sorted then the 22 wud be awsome. I still like the car and its only really been an issue on high grip astro. On carpet and at your place indoor it was fine.

So just adding new holes to the spindles isnt the answer? I was hoping I could just make a carbon plate to move the holes further back/forward on the spindles.

[Frecklychimp]

It may give you enough to dial out the snatchy feeling but unless i do some proper maths i can't work out the differences in angles... tbh i can't be bothered with maths tonight anyways!

Sure you can understand what i mean with linear and radial? with linear the ratio between wheels doesn't change across steering action, on other cars with bellcranks they have a radial ratio which changes how far and angle the arm is positioned during its sweeping motion, which changes the ackermann between wheels... 22 doesn't do this, the change between wheels is in the spindle pivot lengths and distance of mounting points on castor blocks which gives the angle of turn.

I've got a bloke that does Carbon cutting so may be able to get some different shapes with hole patterns knocked up for us to play with.

If you have spare spindles then get the drill out and give it a go buddy

I've always known its the front end giving the issue with mid corner sliding/grip loss but adding weight more towards the rear and using minimal front camber to allow the back to roll and rear tyres dig in helps as long as you are smooth with throttle in corners.

never bothered with it as my driving doesn't warrant designing new parts and i am used to it enough not to be an issue.

High bite tracks it is always awesome as you tend not to use steering as much

[dbizzle5]

Ahha! Ive just moved the castor blocks backwards and put the 2mm spacer at the front which has reduced the angle of the outside wheel. I think u have this done already.
Hopefully this will be enough.

[university_dave]

Originally Posted by Frecklychimp

I was chatting to Tom from Akula and we worked out that it would be possible to fit rear pivoting bellcrank steering on the chassis as there is enough room once rack is removed and there are posts to use as pivot points i you remove the plastic tapered sleeves... just need someone handy enough to make the parts!

Funnily enough I've got a design worked up and costed - I just need to do some more analysis of the ackerman angles to see what effect it will actually have on the steering.

I'll try and find the time to have a look at it this week - been a bit busy with another project recently...