Nohachi's suspension ramblings thread

[roman]

NoHachi Wrote:About roll centre position. If I understand you correctly, your idea is to use struts with a larger inlination angle instead of RCA's to get roll centre back to OEM? Interesting idea, but you end up changing more things then roll centre.

RCAs would definitely be used as well, as big as can fit under the wheels.

But even when you do that, you cant get the lower arms back to the factory angles, so roll centre has still moved in relation to the COG, compared to factory. This would just be another trick to raise the roll centre higher, the very same trick that Toyota uses to raise the roll centre on their cars with heavier factory engines.

I'm aware of the side effects of kingpin inclination angle. buuuuuuuttt, what I propose just mimicks the OEM setup of the 'widebody' cars anyway... If there were any disasterous handling consequences, it would be evident by 75% of the 80s Toyota fleet of RWD cars.

It would be quite easy to see how this suspension configuration drives... Drive an MA61! haha... or Cressida.

SekiguchiUeno Wrote:Roman thanks for new insights.
Newer thought about that, how much degree could the difference between MA61 and AE86 hubs on the strut be?

I cant remember... But I remember hearing that if you use them, you end up with 2-3 degrees of positive camber, if with standard top plates.

So it's not a MASSIVE difference... But just another trick to use to help bring the roll centre back up. I'll have to sketch it up to see how much difference it actually makes.

Quote:Would the camber adjustment be enough, i think not and longer LCA needs to be used. With more lean struts the front outer tire will be put more on their outer edge while steer so it will be needed to compensate with even more caster?

Yep there's enough camber adjustment, it's been done before, I know someone with MA61 struts in their '86. Dont need to use a longer LCA, just adjustable camber tops.

But acheiving the same thing with a longer LCA would probably be better in terms of camber gain, so long as your wheels still fit under the gaurds more or less

Quote:btw: where to get MA61... struts and how they differ in other aspects.

There are pretty much identical struts in MA61, cressida, soarer, etc etc.
Cressida struts are likely easiest to find.
I've currently got the exact same type of struts, but 'narrow body' ones from a TA63 Carina. With the plan to change to the ones with more kinpin inclination angle some time down the track, as I can adjust camber to suit.

The end goal of all of this, would be to use the suspension geometry for roll resistance rather than spring rate, so I could run as soft a spring as possible without having the car tip over through the corners.