Nightpager Brake upgrade supra 323mm disk walkthrough for z20 soarer

[GU11TY]

well i cant find any walkthrough of this upgrade if you guys say so many people have done it!

[Exhumed]

Done it, bolts on, no hub grinding/butchery required... Use DBA 5000 series 2pc 324mm JZA80 rotors and it all bolts on (happy to dig up the part number if it saves a few hubs out there).

All given I've done my fair share of dodgy in my time but angle/bench grinding hubs isn't something I'd be recommending.

Edit: DBA 5000's + this kit will work on an ABS hub also without any hastles.

[ed]

in defense of the guilty (i lol'd) if the rotor is concentrically mounted to the hub spindle/shoulder, which they normally are, and not mounted/centred on the outer edge of the hub flange, as long as a generally even amount of meat is removed (and for a 2.5mm amount, thats pretty hard to majorly ass fuck)... i really dont see what the 'big' problem is.

sure, it isnt the most graceful way to do this, and a lathe is naturally better, but i can't see this process causing a hub explosion, or an off centre rotor?

the only thing id be raising eyebrows over is whether taking 2.5mm off the edge of the hub flange was in any way increasing the stress in the remaining hub flange material around the studs. but no ones mentioned that as their concern?

[Negative Boost]

What's the difference with the ABS hubs? Size?

And another vote to the lathe.

[takai]

in defense of the guilty (i lol'd) if the rotor is concentrically mounted to the hub spindle/shoulder, which they normally are, and not mounted/centred on the outer edge of the hub flange, as long as a generally even amount of meat is removed (and for a 2.5mm amount, thats pretty hard to majorly ass fuck)... i really dont see what the 'big' problem is.

sure, it isnt the most graceful way to do this, and a lathe is naturally better, but i can't see this process causing a hub explosion, or an off centre rotor?

the only thing id be raising eyebrows over is whether taking 2.5mm off the edge of the hub flange was in any way increasing the stress in the remaining hub flange material around the studs. but no ones mentioned that as their concern?

More an off center, abnormally heated cast pig iron hub being flogged around. Doing it on a bench grinder there is no way of being able to tell how out of round you are making it. Plus the concept of grinding a cast iron hub down with a friction grinder rather than a cutting bit is just stupid, the metallurgy just isnt made for that type of localised heat.

P.s. flinging neg rep around with idiotic messages because you are pulled up on a safety issue just makes you even more of a dickhead.

[CrUZida]

you show me one person who has done the conversion in this thread that has told me not to use the bench grinder

Whilst I haven't done this particular brake upgrade, I have performed many brake upgrades which have required hubs to be made smaller, and in all cases I've had them machined on a lathe. Its cost like $50.

Using a bench grinder to modify an integral part of the car which rotates at several thousand RPM isn't the most intelligent move.

[gianttomato]

you show me one person who has done the conversion in this thread that has told me not to use the bench grinder

Using the same logic, a million drunks can't be wrong. You initially even suggest using an angle grinder. What special kind of stupid are you?

Sure I haven't done this particular upgrade, but have performed many others, some of which have the required the hubs to be machined down and have done so on a lathe. It cost maybe $50.

There is little to walk through as it is not a complex conversion. Remove hubs, machine them down, bolt up some dog bones that someone else made, slide on the rotors and bolt up some calipers, bleed brakes. There is nothing particularly difficult here such that it needs a thread particularly when you're adding your own fucking retarded twist to it.

[takai]

Oh yeah, before you spout off about no-one else having machined down hubs before:

[Duk]

More an off center, abnormally heated cast pig iron hub being flogged around.

Wheel hubs wouldn't be made from Pig Iron, it's way to brittle.

[oldcorollas]

it would probably be SG cast iron, but thats not the point

[takai]

True, my mistake late at night. TBH i was thinking brake rotors when i made the comment about pig iron.

[oldcorollas]

what's a couple of % of carbon between friends

[eeeyan]

Not to mention when you machine iron the particulates are basically like pencil lead not something you wanna be breathing in or getting under your skin. This has got to be one of the worst idea's ever using a grinder of any sort. Lathes where invented for a reason.. was this just impatience or lack of funds? Most machine shops will do a love job like this for very little dollars.

Max RPM's for machining cast iron from memory is roughly 2000rpm at 1-2 inches per minute with the machining tool. Keep the heat down etc to stop the structure of the metal itself changing.

Whats the RPM and heat on a grinder like?

BAD IDEA. Use a lathe to anyone thats doing this upgrade.

Bench grinders you only need to lose concentration for a minute and its bye bye parts or god forbid bye bye fingers or something

[brett_celicacoupe]

i think there is some serious over reaction here. while the process is not ideal, i dont feel it is unsafe. grinding can theoretically achieve the same finish as a lathe, if not better.

my thoughts
1. removal of 2.5mm is not going to affect strength.
2. the radius that the material is removed is not going to affect balance by fuck all. ive seen factory hubs that are cast with ~1-2mm of runout.
3. i highly doubt the temperature that grinding induces is much higher than a repeated, hard braking event.
4. grinding temperatures will be very localised and for short periods. i wouldnt expect temperatures to be higher than that from a similar metal removal process (Lathe)
5. oldcorollas can comment on the required temperatures and times required to degrade the material's strength. i think ive read around 800degrees with a slow cool-down. is the whole hub really going to reach this temperature?
6. as someone already said, the disc is located by the centre spigot so the outside shape isnt really important.

im not trying to defend anyone but this is my opinion

[TERRA Operative]

But why chance it with such a blatantly dodgy practice when doing it the right way is so cheap and easy anyway.