I am wondering if its possible to fit big rear discs maybe R31, with a front 240k two piston caliper and what would be involved..
and also does a standard R31 Rear brake conversion into a 1600 require replacement of my 240k rear control arm/and or, hub assembly?

I'm only guessing, but the R31 calliper bracket will probably go on the 240K control arm OK.
The problems with the 510 conversion are minor: -
increasing the hub hole diameter by ~2mm
grinding off some edges to allow the bracket to sit flat on the hub flange
re-drilling some of the mounting holes to line up with the existing flange holes.
If the same issues apply to the 240K then that's it.
Also, with the 510, the calliper bracket when it's flush with the hub flange, positions the calliper EXACTLY central over the disc rotor.
You will need to double check that the 240K arm does the same.
It is possible to cut a section out of the calliper bracket to allow it to mate up without dissembling the rear stub axle.
However you lose one of the mounting holes that way.
If your car has never had new bearings in the rear arms, this is a good opportunity to renew them and fit the calliper bracket at the same time

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Regards, Graeme
Just trying to help...
http://nissanman.shutterfly.com/
graemes@internode.on.net

Thanks for your help Graeme. this is only my first car so i dont know much about it atm.

bout the only complaint ive had about the r31 setup on my datto is that when mounted on the 1600 swing arms the bleeders are not at the top so its a bit tricky to bleed them up, but once done there sweet

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1971, datto 1600, s13 sr20,
gt2871r, 21psi, pumpfuel, 342hp,

Funny you should mention that.
The very first critera I addressed with MY conversion was to have that bleed nipple at the very top of the device.
From memory that resulted in the LH calliper being mounted on the RHS and vice versa.
The handbrake cable turned out better this way too, straight run and better "pull".

_________________
Regards, Graeme
Just trying to help...
http://nissanman.shutterfly.com/
graemes@internode.on.net

yeah im pretty sure we reversed them, cause the hand brake cables are pretty sweet, but still the bleeders arent in the right spot, now you go me thinking going to have to go check this out

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1971, datto 1600, s13 sr20,
gt2871r, 21psi, pumpfuel, 342hp,

Sorry to drag up an old post, but I'll be doing the R31 rear disk swap onto a 180B this weekend, and just have one question....
Apart from enlarging the centre hole & redrilling the mounting holes, where do I need to cut the bracket back? I had a very quick look last night, and it seemed to look like it would go on fine with just the two mods mentioned above?

Any got and pics of theirs?
Ta
Damo

I actually did the conversion to some spare control arms which were off a 180B.
There is a 90deg. return on the calliper bracket that from memory fouls on the spot welded flange of the control arm.
This area is on the edge immediately in front of the backing plate flange.
I think all I had to do was cut a wee notch in the calliper bracket to allow it to clear the flange.
You'll soon find out when you try to sit the bracket flush with the backing plate flange

_________________
Regards, Graeme
Just trying to help...
http://nissanman.shutterfly.com/
graemes@internode.on.net

Thanks heaps Nissanman,

I assumed the 'angled' bit on the bracket faced outward (leaving the flat surface on the inside).....now I see!

Thanks again
Damo

Hmmm, that 1600 looks like it needs a gearbox rebuild....

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Ben
Adelaide,
South Australia
L28ET 240Z
RB25DET WGNC34 Stagea RS-FourV

How very astute of you

_________________
Regards, Graeme
Just trying to help...
http://nissanman.shutterfly.com/
graemes@internode.on.net

When doin this conversion to the rear of the 1600 has anyone had any troubles with their wheels fouling on the calipers afterwards.

also has anyone got any in progress pictures of the conversion or just the end result????

also i forgot to ask in the previous post... is the new mounting braket for the r31 calipers welded to the 1600 "A" arm or is just a redrilling of the holes that allows it to be bolted to the "A" arm??

Aaron.

I'm running 13x8 wheels, and naturally had some clearance issues with the calipers. A small amount of grinding of the taller fins on the caliper will give plenty of clearance with the wheel.

I haven't welded the backing plates in, and by the looks of it neither has Nissanman. After all, they are only bolted in on the R31.

Cheers,

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Chris [;-{)>

Hi again,


After doing this conversion over the weekend, I've got one small concern;

By slipping the disk over the stub axle, it now sits perfectly flush with the wheel mounting ring cast into the stub axle end.
This means that the wheel will now only be supported by the wheel studs.....has anyone had any problems with this? (Studs breaking, wheels falling off etc?)

Its a rally car, so I'm a bit concerned that it may not be able to handle the abuse for too long!

Nissanman, anyone?

Ta
Damo