2 OR 4LINK coil suspension ideas for ke20?????

[Hurricane]

haha what the hell?
im guessin a jag invention.
looks like u would need to run the diff housing mounted like an IRS setup, might as well just use IRS.

that setup looks weird and heavy, but u could take part of it and mix it with a 2 link setup?

dan.

[oldcorollas]

de-dion is actually not that bad.
much easier to mount than IRS knuckles, and similar weight benefits





other thoughts, you could use short top arms, inwardly angled, so they terminate aroudn the trans tunnel , and splay out to wider ont he diff.
would need lateral locater like watts or panhard to help, but would minimise body cutting

[Hurricane]

it also look like it might need less height to mount it all in, so in turn less floor cutting?

[oldcorollas]

dedion is basically a fancy 2 link, that doesn7t cause issues with body roll.. and reduces unsprung weight (= easier to control tramp?)

[Hurricane]

true, true.
just not as simple as a normal 2 link, might give it ago one day OC?

dan.

[Joshstix]

NASCAR is limmited to 2 link rear suspensions, they call it truck arm.

Apparently it can be made to work really well but it doesn't seem like the best idea to me.

[oldcorollas]

ahh this sort of thing?

[JustenGT8]

Looks easy enough but heavy? The rear torsion bar seems to make it a 4 link?

Why do the arms need to be so long?

[oldcorollas]

there has to be some compliance if the torsion bar makes it 4 link, or it will bind outside of a small range of movement

long arms for force transfer and stability..

[Joshstix]

Yep the long arms are to allow a bit of articulation since they are bolted solid to the diff housing.

[YLD-16L]

Grab a copy of the book 'Chassis Engineering' - by Herb Adams. It's an old school chassis and suspension design book that is well suited to early Toyotas like the KE's. The book is written in a way that anyone with half a clue can understand and the concepts are easy to grasp. It covers most of the rear end and front end suspension designs and their pros and cons.

I grabbed a copy when I was considering fitting a 4-link to my KE25 and found it to be a good read.

I decided against doing the 4 link in the end for a couple of reasons, one being that it would change my class of racing and if I did do it I wanted to do it 100% spot on and that was a big investment to commit to this chassis, and I wasn't prepared to do that.

Besides, I've never had axle tramp issues and the car isn't exactly slow around corners and I certainly haven't reached the limit of the leaves yet either.

[WDE_BDY]

2 link is basically only good in a straight line (drags) or a very smooth track (Nascar). The main reason they run really long arms is to minimise the pinion angle change so if you try it using the leaf mounts you will get some really nasty results. For the KE20 either tweak the leaves to do what you want (some good info on Toms SR5 Corolla page, http://www.bigflea.com/corolla/index...D=109&Nav2ID=7) or you could look to adapt a KE70 type setup to it. Not ideal but should minimise floor cutting, could also look at the Crown style 3 link or even a factory style triangulated 4 link (KP Starlet run these). At the end of the day, unless you are doing some serious cutting for an equal length 4 link setup then you will be compromising.

Callum

[JustenGT8]

ah, pinion angle control makes sense.

[Hurricane]

the setup im looking at using is the same as what 80,100 series ladcrusiers and alot of other stock 4wd's use.

running 2 arms bushed at both ends and a panard rod.
im not sure if this is a 2 or 3 link setup though.

also the stock leaf mounts wil be removed and custom item make to sit af far forward as they can, also suspention travel will not be massive, alot less that what the cruisers use stock, so i cant see why the pinion angle will change to the point of coursing issues?

i beleave this is the setup MID9-5 is thinkin of making and refering to as 2 link setup.

arms

dan.

[WDE_BDY]

There is a massive difference between use in a 4WD and a much lower RWD for this sort of setup. If you are running bushed both ends do you mean two bushes at diff end (as pictured) or one, one will flop around around and two means it is effectively fixed with a little slop in it. If you want to do it I would would be modelling it in some sort of CAD program to see the effects, while you say the pinion change should be minimal it doesn't take much to be an issue. Think about the AE86/KE70 setups, anyone getting serious tend to try to get all four arms to equal length in part to combat pinion change.

Callum