Jump to content
SAU Community

Recommended Posts

Hi guys,

was looking at the RDA rotors group buy and had a thought whether i could get R34 GTR sized discs and put them on my GTT, ie oversize the standard OEM diametre...

Not sure of the rears but the fronts are 324 vs 310mm comparatively, but the height difference is only .05mm, which doesn't sound huge but i don't know, could be a massive difference.

Would it be a stupid to run oversized rotors on standard calipers? I thought it might be a cheap upgrade because i doubt there is much difference price wise between the GTR and GTT discs.

If it is possible, would it be a huge headache to modifying whatever to make the GTR sized discs to fit?

cheers,

daniel

anyone? i'm looking to burn KRudds money on my car and this might be a place...

my logic at the moment is that the GTR rotor price is VERY similiar to the GTT RDA rotor price, so why not go bigger if it's the same money?

what i don't know is how much of a headache it will be to fit...

  • 1 month later...

no you can't. the radius is 7mm different. the only way to do it is to get a bracket to mount the caliper 7mm further out. but you can't obviously as the bolt holes will be more than 7mm. so it would have to offset the caliper to allow you to bolt the bracket to the hub and the caliper to the bracket. considering you are trying to save money, then i would give it a miss. making custom brackets to gain 14mm rotor diameter is not worth the $500 it costs you.

RDA rotors are pretty cheap troy. maybe $200 or so for a pair of slotted GTR sized ones. there is a bloke flogging them on the forum in the group buy section.

thanks for the responses guys :P

I was told i could using something called "dogbones"? that mean anything to anyone?

There wasn't much of a price difference between the GTT and GTR rotors, so that got me keen. I think it was mid $400's all up? (4 discs)

Sounds like it would be too much $$ to make the brackets. Thanks for the info :(

right o, so if i can find some already made for this sort of application then maybe it might be worth it...

where'd you get your dogbones from and were they pricey?

cheers,

daniel

yes dogbones are brackets, but for good ones your looking at $400+ for them. there is no way you'll find some off the shelf to run a 7mm diameter bigger rotor. it's just not worth it. you could get them made but you're looking at $500. and again it's such a small difference it's not worth it. if you were running 280mm or even 296mm rotors it may be worth it. but 310 to 324 is NOT worth it. if you want to waste some money on gaining 14mm in rotor then by all means dig in. :D

no thanks. Been to Race Brakes before and will never go back. Harold was a tool, the guy working on my car chipped my rim getting one of the caps off, and basically i was told to run some $600 a pair Endless Ceramic pad to fix my supposed brake issues. So much for a supposed SAU Vic sponsor :laugh:

And from a few people i've heard the opposite, the DBA's aren't much chop and to go RDA's. And considering how many people have gone through the Group Buys for the RDA rotors, surely a bunch of people would have problems by now if there were issues with them.

I think i'll probably just go with he Group Buy RDA's in GTT size, keep my QFM A1RM pads i've got now (very similar compound to the RB74's i believe, but cheaper) and perhaps call it a day. Maybe get some braided lines as well. Already got a brake stopper thingy.

thanks for all the help guys :(

I think i'll probably just go with he Group Buy RDA's in GTT size, keep my QFM A1RM pads i've got now (very similar compound to the RB74's i believe, but cheaper) and perhaps call it a day. Maybe get some braided lines as well. Already got a brake stopper thingy.

best idea of the thread. :laugh:

done. Thanks for the help bubba, but ze baron is making sense and i didn't know they were that expensive.

ok, moving on. Thanks all :P

No worries, I'm with teh baron on this too - in my case it was 296mm to 324mm. I put some DS2500 pads in at the same time so I can't say how much better the bigger rotors or pads are but together, they were a hell of an upgrade over the 296mm rotors + bendix pads.

Oh and slotted 324mm rotors look better than non-slotted 296mm rotors :D

no thanks. Been to Race Brakes before and will never go back. Harold was a tool, the guy working on my car chipped my rim getting one of the caps off, and basically i was told to run some $600 a pair Endless Ceramic pad to fix my supposed brake issues. So much for a supposed SAU Vic sponsor :starwars:

And from a few people i've heard the opposite, the DBA's aren't much chop and to go RDA's. And considering how many people have gone through the Group Buys for the RDA rotors, surely a bunch of people would have problems by now if there were issues with them.

I think i'll probably just go with he Group Buy RDA's in GTT size, keep my QFM A1RM pads i've got now (very similar compound to the RB74's i believe, but cheaper) and perhaps call it a day. Maybe get some braided lines as well. Already got a brake stopper thingy.

thanks for all the help guys :blush:

interesting...

i still havent cracked my RDA fronts, and i rate RB74's over endless SSS(FWIW)

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

    • Had a go at the stuck crush tube this afternoon. Tried things like grips and a chain wrench first but wouldn't just twist straight off. So got to work with a drill. Started small and kept a depth stop on to make sure I didn't drill into the bolt. Made a line of drill holes all the way up and enlarged them. Then a combination of chisel and Dremel to split it all the way up. Levered the split to get oil in there and eventually it gave a bit while levering. Worked it back and forth with loads more oil till it was spinning freely, then with grips I could work it downwards and off. And no significant damage to the bolt (not by me anyway - just the 27 years of rust)
    • Well, I'm tired. I'm tired because about 4PM yesterday, before today's appointment someone immediately bought my bumper. They couldn't get it any other day as they're on the way back to NSW. So I had to do that big GTR conversion I had been planning. Unfortunately, the information on SAU about what you need and how this is done is incomplete. So what should be a simple bolt on affair, yeah, it's not. Did you know if you use all GTR items the bonnet won't close? This little manuever sent me into about 1am the night before trying to dodge a way to get it closed. I will have to revisit this in the next few days  - or maybe not, I may let a body shop figure it out. It all needs to come up and my motivation to pull the bumper off is low. It also seems to hit things in the bay where the GTT bonnet didn't. Yes I used 100% new OEM GTR items. Today, I had the joy of driving to the dyno looking like this: Given I had roughed in the fuel and given sensible but pretty conservative timing, I didn't really bet on having the car drive out any real difference than when it drove in. Sadly due to a miscommunication and laptop fun and games (and almost bricking the dongle, prayers and firmware updates indeed), I ended up using HP Tuner credits to licence the car that was already licenced. So in the end my laptop was used. It turns out my butt dyno is still well calibrated after all this time. The 325kw was on 74% Ethanol, the 313kw line was on 98. The other line is the 'before' line which was 281kw. While the numbers are pretty low, they're pretty in line with what you'd expect. Even if US dynos bump the whole result up about 50KW, gaining 10-15% is similar gains.  The curve of the cam is pretty much spot on with what was discussed as well. All this said, it still feels bad to not see the number you secretly want to see. Even if the car drove great beforehand, and I knew pretty confidently the car would drive out much the same way it drove in due to the nature of a wellish dialled in LS1 not gaining much if anything at all from being tuned from where it was. As expected, the car isn't particularly sensitive to running it at anywhere between 12.0 and 13.0 - And the initial timing at 20deg and 12.0 made 308KW. So 3 degrees of timing, and leaning it out to 12.7 for 5kw, anything above stopped giving any benefit until E85 (which has an additional 2 deg as before). Car itself behaved entirely fine. I found out that 100C = 1.15V! IAT at about 7pm was 19C. I might mess with the bonnet mounting.. but given the REO NEEDS TO BE CHOPPED TO FIT A GTR BAR this is possibly something I may leave gathering (more) dust until it returns to paint jail.
    • It sounds farrrrrrr too cold at your place Duncan... Here I was thinking our 10 degrees overnight is getting cold...
    • oh yeah, reminded this morning....bin lids frozen shut too
    • In my case not, because of total reno. But yeah.
×
×
  • Create New...