DR30 / MR30 Hatch rear ends

[Adam_RSX]

How similar are they? I've bent my back right wheel in at the back, its sitting on a diagonal in two planes, havent had a good look at whats bent but aside from the diff, whats different about a hatch IRS rear end?

[B0oStEr]

They are the same except the diff and halfshafts are larger in the dr30.

All else bolts up the same.

[Boof]

What did you do now adam???

[boj01]

Trying to be a race car driver I guess??

[Adam_RSX]

Nothing... I can't drive the bloody thing.

What I did at the same time as hitting a rock with the sump (well... just after it anyway) was driving it on a dirt road (done many times before but previously always on semislicks) on normal tyres, hooked it around a tight left hander with some handbrake at the same speed I'd done before but it slid a tiny bit too far out and smacked the right rear wheel into the bank.

This was just after I'd heard something smack under the car on an uneven bit of road, but there was no knocking from the engine, pulled over just down the road, saw there was rocks and shit embedded between the wheel and tyre but didnt notice the wheel was in until I'd gotten it home. Noticed the knocking from the FJ when I pulled over to check the wheel, switched it off, checked under the car for oil leaks, checked the oil, put more in for good measure. No mobile reception, no houses, after midnight on a weekday... SH1T!!!!!! Decided if i could drive it at very low revs a max of a km I could get it to a position that I could probably roll it home, or at least push it as there would be no more uphill bits, so I did that. Knocking got a tiny bit louder for the short time it was running (figured if it was stuffed it would need a rebuild or replacement anyway...)

Got home, jacked it up to take the weight off the tyre as I felt it could go flat from an imperfect seal, had felt flattish rolling home, back was swinging a bit but didnt look like it had gone down much. I didnt want to bend the rim of the Watanabe so I stuck an Enkei on the next day, noticed the wheel was sitting in a bit on an angle but thought some might have been from jacking the car up, rolled it up and down the driveway a bit to try and get it to settle but it didnt do terribly much.

Then I rolled it into the shed and forgot about the car until I went to get something from the shed the other day.

So I've bent something..... just dont know what it is yet

Only time I've ever hit anything btw... and I wasnt going quick at all, just like using the momentum of the car to bring the back out a bit on that corner, the dirt road is a bit of a shortcut between two good roads in the hills

[V8skylineMAN]

sounds like maybe bent the bolts that the swing arm pivots on.

[sr201600]

That good to hear about the MR rear end are the same as it looks like something is bent in the back of mine. I have 9 degrees of toe in on the right rear.

robert

[blind_elk]

sounds like maybe bent the bolts that the swing arm pivots on.

My experience has been that you bend the axle housing (180B SSS).

[Adam_RSX]

Mine is toeing out

[Crimmo]

Sounds like axel housing, basically swingarm would be bent. DR30 disks are obiously bigger than aus mr30, but im not sure if them swingarm shell, hub/axel carrier is the same. You may be able to get an mr30 swingarm and switch hub and disk, caliper etc

[DR JOSH]

I folded a wheel under my car putting it up a curb. I just payed a visit to jaustech they had a couple of arms laying round $150 which was a bit sore on the old pocket though.

However since then I have had a bit of a look at the wreckers and so on and from what I can see the mr30 sedan disk rear end is wrong on the caliper to rotor offset, however hatch back rear calipers fit on the rear DR30 arm and disc assembly which leads me to believe the hatch rear arms will fit up no worries, how ever I have never actually tried. If that makes any sense to you.

[Boof]

Long and the short of it adam..Let the tape measure be your friend and suck it and see

[Adam_RSX]

Yeah, I will when I get the car to dads and start pulling it apart. Hopefully the torque-monster stroker Charade will be sold on Friday so I can spend the cash fixing the DR

[BensDR30]

FWIW...

RMR rear discs = 258mm

DR30 rear discs = 290mm

There is a pair of DR control arms on Yahoo! Japan going cheap.

[B0oStEr]

I think some dr30s had the 258mm rotors as I bought a complete dr30 rear-end with a open r200 diff and 258mm rotors.

[Crimmo]

I think some dr30s had the 258mm rotors as I bought a complete dr30 rear-end with a open r200 diff and 258mm rotors.

smaller disks, open r200, sounds a bit like a hr30 to me... ?

[Adam_RSX]

Hmmm, took the DR out of the garage and swapped the wheels off it so its sitting on the 16's and had a look under the back. I couldnt really see what was bent, it might be the arm where the axle goes through, it looks a little bit like the arm is bent in where it meedts the hub. Though it could also be where the arm mounts off the chassis... I guess I'll need to go and get all the MR30 hatch arms and then compare everything

[Adam_RSX]

Engine is running now, so I just need to get the back fixed.

Took it to a suspension / alignment dude yeasterday and he said that the arm probably needs to be replaced.

From what Bensdr30 said, the MR discs are smaller than the DR ones... but if the DR disc will bolt ono a MR hatch rear then that should be fine? I'll try Jaustech first for some DR arms I think

[stagefumer11]

They always bend at the hub. mine is bent with +2 deg of camber. But i cannot find another one yet. Makes it handel like sheott

[Ghostrider]

Engine is running now, so I just need to get the back fixed.

Took it to a suspension / alignment dude yeasterday and he said that the arm probably needs to be replaced.

From what Bensdr30 said, the MR discs are smaller than the DR ones... but if the DR disc will bolt ono a MR hatch rear then that should be fine?  I'll try Jaustech first for some DR arms I think

<{POST_SNAPBACK}>

Adam,

The basic arm is IDENTICAL, it mounts to the same place, they are both interchangeable, BUT as Ben says, the rear brakes on the MR are different, they are only 254 instead of 290, the caliper mounts may be different as well.

The DR rear arms are unique as the HR's are same as MR & I just chucked a pair out yesterday. The original arms off my PNV, gone to the recyclers.

I have a pair of stock HR calipers here as they are very similar to DR. I will check tomorrow if the calipers can be mounted to the DR rear end etc and advise further.