More progress on the FB

[dankilleen]

Looks interesting.

If the inner tie rod end locations are as close to standard as he says, then it might work.  However the standard tie rod ends do not move in a purely left to right fashion as in his design - they actually trace an arc about the idler and steering box. To add to this, all this movement is not in one plane - if you imagine the passenger side idler as it at approaches full right hand lock, the tie rod end is actually higher and further back to its original straight ahead position.

Having said that, perhaps this arc is part of the problem with the original steering anyway (beside the fact it uses recirculating ball and nut box).

All I know is, that the geometry is only ever a trade off between about a million different parameters.  99% of which I wouldn\'t know how to analyse.

It is no doubt possible to do, but I think a pen, paper and calculator might be the way to solve it - good luck to him though.

[MikeLMR]

I hadn\'t thought of that , as you turn the wheel from dead ahead the end of the tie rod will move towards the back of the car

I think I\'ll sit back and let a few other people try out this setup and see how it works out first

The other alternative is to bolt in a complete 2nd gen subframe

[dankilleen]

2nd Gen subframe - sounds like a lot of work.

[MikeLMR]

its not a simple job

http://www.rx7club.com/forum/showthread.php?s=&threadid=176299&highlight=subframe

http://www.bcrx7.com/modules.php?name=Forums&file=viewtopic&t=2055&highlight=subframe

What are  you doing with your 7 ? is it for track use

Mike

[dankilleen]

I suppose it is really, though I hope to use it on the road after I\'ve fitted everything to it.  My intention is to get the chassis and brakes sorted in the short term (+ a LSD, lightened flywheel and H/D clutch) in preparation for a RX-8 engine and box from a write off - yes there is no doubt a few people with this dream....

I chose the car for the engine.  A friend had a 10,000 rpm 12A bridgeport engine fitted in a RX-3 - I don\'t think I stopped grinning for weeks after driving that.  But also for the fact that it\'s a lot lighter than any 7 that followed.  

I just want a cheap track car that will be enjoyable to drive fast (don\'t suppose it\'ll be dead cheap by the time I\'m finished).

I need to fit an oil cooler, match port the intake manifold (there is a lot of difference between the port size on the centre housing and the manifold - though I don\'t know how much hp this will release, engine is approx 150 -155 at present with exhaust system and carb mods)  then I\'ll be off to the track to scare myself.  Ought to be fun.

[MikeLMR]

hmm I\'m thinking about a 12a bp for mine eventually ... got to price up what it\'ll cost first though

[dankilleen]

Looks like the above development is coming along well in the states.  I think a right hand drive version might place the steering input right in the middle of the exhaust manifold especially if the original thermal converter is installed.

Lets hope there is a way around this, or that it isn\'t a problem.  The benefits of rack and pinion would be huge.

[rotary emotions]

A German guy has an FB with 200hp 13B TII engine. He (well the guys who build the car) has used a complete front end of a TII. So subframe, struts, strut towers, etc... Very much work, and not really neccessary if you ask me, but still intresting. Take a look here: http://www.rotary-mechanic.de/
I tried the link, but it says it\'s closed at the time??? Maybe it returns, maybe not. I\'m not sure.