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PostPosted: Mon Jul 09, 2018 3:43 pm 
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Very cool. Looks like the front matches the rear quite nicely.
They look like big brakes under the fronts. I assume R33 disks?

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1972 Datsun 1600, S14 SR20DET Engineered (190-210kw @ 15-16psi.)
http://www.ozdat.com/forum/viewtopic.php?t=6579
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PostPosted: Mon Jul 09, 2018 4:28 pm 
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Location: CRACE, ACT
Currently Z32 / R32 but I have a set of 296mm Exige rotors to go in with R33 calipers modified to fit 26mm wide rotors, all on my own design alloy hub. Slightly bigger, but a massive 3.5kg lighter per side ... compared to std R31

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Last edited by AlanDatsomefun on Mon Jul 09, 2018 4:36 pm, edited 1 time in total.

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PostPosted: Mon Jul 09, 2018 4:32 pm 
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3.5Kg is massive.

I've always wanted to get an aluminium hat floating version of the R33 rotor I am currently using on the front of my car.
Unfortunately DBA don't make them. Plus they would be too expensive I think...

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1972 Datsun 1600, S14 SR20DET Engineered (190-210kw @ 15-16psi.)
http://www.ozdat.com/forum/viewtopic.php?t=6579
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PostPosted: Mon Jul 09, 2018 4:45 pm 
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Earlier, I included a photo of rotor, hub and alloy spacer plate under the thread "Brakes Upgrades Performance and Weight".
The R33 calipers look no different, they are just 4mm narrower: no real saving here.
The 296mm diameter x 26mm thick DBA bolt-on rotor for the Lotus Exige is heaps lighter than the Nissan R33 rotor which also incorporates a cast "hat", overall making it as heavy as a boat anchor.
The alloy hub is very much lighter than the Nissan Z31 Californian 5-stud one, not surprisingly.
Whilst the design replaces cast iron with aircraft grade 6061-T6 alloy, the whole assembly contains much less metal.
Unfortunately, this worked out to be a very expensive modification. Titanium bolts have to be used to fit the rotor.
Hubs have a design life of 80,000km.
This was quite difficult to design and tricky to build, particularly from the viewpoint of installing the bearings without damaging the hubs.
... but exciting to do.

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PostPosted: Thu Aug 09, 2018 7:00 am 
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Cool thread!

I enjoy daily driving my 510 with rack and pinion, hope you guys get to do the same.

Baz less then 3 turns lock to lock isn't bad on the street, although in our enduro car it's enough to wear you out. It has 225's all the way around, which is some serious grip!

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PostPosted: Thu Aug 09, 2018 10:22 pm 
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Hi Icehouse, can you post some more pics and info on your car.
What rack and cross member did you use for your conversion?

Cheers
Mick


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PostPosted: Fri Aug 10, 2018 2:27 am 
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Coz22a wrote:
Hi Icehouse, can you post some more pics and info on your car.
What rack and cross member did you use for your conversion?

Cheers
Mick



Me and a few of my buddies make these [url]JBcoachwerks.com[/url] We've only done a few of each version, but I enjoy one of each in my many cars. It took us a few years of 3D modeling and prototypes to get where we are. I think it was all worth it though. Like you guys we heard all the different "rules of thumb" and it was cool to see what actually effects roll, bump and ackerman without having to change a test jig. As you know, over here we like our cars super low. So it's really cool to have a car that tracks well through the rough roads while avoiding bottoming out.

One tidbit that blew my mind when figuring out what effects bump. I saw the earlier post about LCA's neeeding to being the same length as tie rods. That is actually wrong. Imagine if you will, the strut at max droop then max compression. Notice any odd changes? Since the strut has caster the more compressed it becomes the more caster that is added. This rotates the outer tie rod down effectly giving it a different arch then the LCA. There is even more to it then that but I'm bad at explaining things through typing. It's a fun thought experiment though.


How do I post a picture that isn't so big?


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PostPosted: Fri Aug 10, 2018 9:14 am 
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Location: Blue Mountains, NSW
This thread is still going then! Looks good. I'd resize the images and host them on this site rather than photobucket or another party?

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Ongoing Project: 1972 Datsun 510 S13 SR20Det. http://ozdat.com/forum/viewtopic.php?f=33&t=17898
New Daily: D22 Navara (The new workhorse)
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Previous Car: Restored Green 1972 Datsun 510, Hot L18


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