Jump to content
SAU Community

Recommended Posts

  • 1 year later...

Eff, time flies.

Finally got around to trying put R31 discs/calipers onto R30 struts. Short story is it doesn't appear to work.

First problem is the much deeper grease seal (assembly?) on the hub has a diameter that is too large to pass through the hole in the baffle/backing plate. Took a few photos to compare easy fit over R30 hub but not R31 and the diffferent approach to sealing the hub but they're too big for upload. Anyway easy solution would be to relieve this baffle/backing plate, except for the next problem...

The there is not enough clearance between the torque member and the knuckle arm when the brake is used. Cruddy photo below shows it hitting the knuckle arm. Only really allows a few mm of movement. So you could have bigger brakes but not be able to use full pedal pressure because you'd foul your steering. You could of course relieve some of the (what appears to be cast iron) knuckle arm, but not sure what that would do for its strength...

post-68475-0-59594900-1327923193_thumb.jpg

Good points are that (without the baffle/backing plate) the disc slots onto the spindle perfectly with the inner and outer bearings lining up perfectly. The caliper bolt spacings are also an exact match (but you'd have use the longer R31 bolts) and the R31 brake lines also graft onto the R30 system perfectly. I would also say this system would have to perform better than the original CL22V calipers as they act over a wider area on the disc and the discs themselves feel quite a bit heavier with more vents so most probably could accumulate more heat and disburse it more easily.

So the conversion has a few positives. I know others say they've done it before so I'd love to know what enabled them to complete the conversion. Perhaps there's a really simple thing I'm missing here; bits, brains whatever?

If it matters, my R30 is complied/built Sept 84 so is update with sharper-edged bumpers etc. Can't speak to the R31 parts but they appear the same as those I've seen in photos of R31 brake systems.

hey mate

i have a set of brakes laying around from my R30 i took them off as i have upgraded to R33 calipers the brakes worked great no leak and they have brand new bendix pads travelled like 200km before car was put off the read for upgrades

i u want shoot me an offer

  • 3 months later...

Hi guys, I just tried recently to swap r31 s2 discs onto my mr30 and nothing but trouble.

i found as i drove home i had all sorts of noises an crap so i swapped the r31 struts on too. that worked ok

but the shocks were shot and the offset ended closer to the inside of the car..

so my +25 wheels scrubbed out on the inside.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Yes, I know🙄 but the sequential is not in my budget... don't want to reduce power neither, so looks like I'm stuck in the rabbit hole🤣
    • You’ll be very upset when you bust that too not to mention the gearing totally sucks. Don’t do it.
    • Is the panel filter one that is oiled? Have you ever cleaned or touched the AFM?
    • So.... the K&N air box thingo was too big, ended up gifting it to a mate, well, by gifting it he actually supplied food and beer at the pub,  which was nice, as it will not sit on a shelf in the garage for the next 10 years I did trim up some of the existing stuff to neaten it all up and gave it some wrinkle paint, unfortunately it currently has a used and abused mish mash of different types of hose clamps, 4 big fat T bolt type (shit), and a few normal clamps of vairing sizes and brands, but..... only until the 6 constant tension black worm clamps that I ordered from EFI solutions turn up next week Currently the current hose clamps are triggering me hard, LOL Is this the final version, probably not, I really want just 2 silicone pieces, a straight bit of silicone from the filter to the MAF is easy and will happen as soon as I head into Just Jap tomorrow, the problematic part is a 30° silicone bend from the MAF to the TB that I can connect the engine breather from the head, I found that there are bulk head fittings for boat bilge pumps that should work, but until I can get a 30° silicone bend the alloy pipe, and the 11ty thousand hose clamps, are there for the foreseeable future 4 hose clamps are golden, 6 are grudgingly acceptable, the 8 currently holding it all together is just taking the piss    I've also ordered 60 more retaining wall blocks for the front yard, I mis-gonculated the height that was required to get above the base of the Photinia's (red robin's) that are the hedge behind the front fence, currently it is 2 blocks high, and about 1/2 a block short, so going 3 blocks high will be above the base of the red robin's, and allow some room for mulch
×
×
  • Create New...