R32 Gtr Stock Rotors To 324Mm Rotors

[Legionnaire]

Makes sense. However available "oversized" pads are not heaps bigger that factory pad, only slightly bigger

[djr81]

I totally agree with your first point, but not everyone has money/needs/wants F40/F50 or any other a/m caliper, because stock calipers are OK for light track work, and while I hate soft and mushy pedal myself, it can still be improved somewhat with MCS and braided lines.

Please dont get me wrong it will be better - but it is not going to be perfect by any means.

I bought some second hand F40's with brackets. The gain from the basic R32 gear to that , even with a 324 rotor is a good one. The cost doesnt have to be huge either.

the #2 - sumitomo pad area is small. Why not to use larger pad that fits the caliper? Is there some working penalty to this? Given the same friction compound, braking force won't change, cause area is irrelevant to force, but heat transfer, heat generation and distribution will be better in larger pad. Or Am I getting it wrong?

Yes you may make a small gain - but the difference in pad size will only be a small one too. If you have a look at the photo I posted you will see where the smaller pad has broken up. I found this to be not uncommon at a track day - so I was paying again & again for pads. Some cheaper pads (no names, sorry) would, once they got too hot, lose their friction coefficient and nothing I could do would get it back.

[Legionnaire]

Please dont get me wrong it will be better - but it is not going to be perfect by any means.

I bought some second hand F40's with brackets. The gain from the basic R32 gear to that , even with a 324 rotor is a good one. The cost doesnt have to be huge either.

Yes you may make a small gain - but the difference in pad size will only be a small one too. If you have a look at the photo I posted you will see where the smaller pad has broken up. I found this to be not uncommon at a track day - so I was paying again & again for pads. Some cheaper pads (no names, sorry) would, once they got too hot, lose their friction coefficient and nothing I could do would get it back.

Funny enough, I ended up buying some F50's myself. But mainly 'cause I found them for cheap, if it wasn't for that opportunity, I would have been using sumitomos with larger rotors and larger pads, as per my initial plan.

Aren't 324mm rotors too thin for F40's?

It's not the first time you post this photo, is it? I've seen it several years ago and saved in to my hard disk for a reference of pad sizes, so thank you very much for that

May I ask where was that delamination occuring? Was it the area under leading or trailing pistons?

[djr81]

Funny enough, I ended up buying some F50's myself. But mainly 'cause I found them for cheap, if it wasn't for that opportunity, I would have been using sumitomos with larger rotors and larger pads, as per my initial plan.

Aren't 324mm rotors too thin for F40's?

Nah they are fine. I went the F40's because they matched the piston area of the Brembos from the 33's. They use the same pads as the BA Falcons with four pots Brembos so they are a good thing IMHO. I have often wondered if the Ex Falcon Brembos could be adopted for the front of the GT-R's - makes more sense than the Emo Brembo idea. Never really persued it as I had the callipers anyway.

It's not the first time you post this photo, is it? I've seen it several years ago and saved in to my hard disk for a reference of pad sizes, so thank you very much for that

May I ask where was that delamination occuring? Was it the area under leading or trailing pistons?

I probably have used it before. It was one of the things I had in my mind when looking for a calliper. Would have been a better photo if it had have been in focus.

It was a case of more pad area, larger effective radius & more airflow (from the larger rotor size). Win, win, win. THe thing actually stops now and I dont destroy a set of pads every couple outings. Down side is I cannot find a reliable source in the States to import the Ferodo Ds2500 from - part number FRP3028H/FDSR3028 (without the cutout I thinK). I did briefly find one but they went bust.

Cant remember where the delamination was to be frank. I would guess on the rear of the pad as logically that is where it would be the hottest.

Edited September 8, 2011 by djr81

[Beer Baron]

I run F50s on my R32 with 355mm rotors and it's a pretty good set-up. not as good as a nice set of alcons but it doesn't cost $10K either... it's certainly a shitload better than running the sumitomos. putting bigger pads that stick out of the caliper is just a waste of time. if you want to stick with the sumitomos then by all means run the 324mm rotor upgrade, good pads and braided lines but getting pads that stick out is not going to do anything. you do get a gain in simple leverage and heat capacity with the larger rotor but if you need more then you really need new calipers, 33/34GTR brembos are the next step up and are a much better caliper than the sumi's and have bigger pads after that you need F40/F50 and if that's not enough then it's time to open your wallet wide.

[Roy]

I have often wondered if the Ex Falcon Brembos could be adopted for the front of the GT-R's - makes more sense than the Emo Brembo idea. Never really persued it as I had the callipers anyway.

I posted the piston sizes a while back when a friend bought a set and I grabbed them to measure up. The were something like 48/44, they were a lot bigger then F50 calipers in the piston size. Means you would have to go for pretty big rear 4 pot calipers and play with master cylinders.

The best thing about the F40/F50/ST40 etc is that they are only 4 pot. So all the cool kids bin them and go for supposed "far better 6 pot" option So if you hunt around you can get some real good buys. For about $1500-200 you can get some F40s with brackets to suit 324mm rotor. If you find that you still struggle, or upgrade to more power/grip etc then just pony up for a new set of 343 or 355mm rotors etc and throw the F40s on them.

I currently have a pretty basic 4 pot setup using new 343mm rotors that all fit under a 17" wheel. It didnt cost the earth and for what I do with the car is almost perfect. Alomost because I wish I still had F40s rather then the Stoptech ST40, as whilst the Stoptech caliper is a slighly nicer thing being forged rather then cast, a slightly better bridge design...the pad availability is not even close to being as good as the F40/50 range of calipers

[djr81]

I posted the piston sizes a while back when a friend bought a set and I grabbed them to measure up. The were something like 48/44, they were a lot bigger then F50 calipers in the piston size. Means you would have to go for pretty big rear 4 pot calipers and play with master cylinders.

Ah ok. damn. Not like the F50 is short on piston area anywway.

The best thing about the F40/F50/ST40 etc is that they are only 4 pot. So all the cool kids bin them and go for supposed "far better 6 pot" option So if you hunt around you can get some real good buys. For about $1500-200 you can get some F40s with brackets to suit 324mm rotor. If you find that you still struggle, or upgrade to more power/grip etc then just pony up for a new set of 343 or 355mm rotors etc and throw the F40s on them.

Yeah the cool kids wont even talk to me anymore.

I currently have a pretty basic 4 pot setup using new 343mm rotors that all fit under a 17" wheel. It didnt cost the earth and for what I do with the car is almost perfect. Alomost because I wish I still had F40s rather then the Stoptech ST40, as whilst the Stoptech caliper is a slighly nicer thing being forged rather then cast, a slightly better bridge design...the pad availability is not even close to being as good as the F40/50 range of calipers

Dont worry about the F40s Troy. They are being looked after.

Edited September 8, 2011 by djr81

[SiR_RB]

thanks for all the replys but i decided on a set of AP Racing 6 pot fronts (came up at a good price

will be running braided lines and motul fluid, should be done by this weekend

[bubba]

By the way anyone imported Ferodo DS2500's recently?

Not imported, no. The last set I bought from PBP just before I took the 32 off the road ~18 months ago, cost about $550 for fronts and rears.

[Beer Baron]

you tried these guys for DS2500s DJR? http://www.zeckhausen.com/Brembo/GT1_Pads.htm

pad choice for F40/F50s is probably second to none. all the euro stuff is available, so is the US stuff and even the japanese stuff is all made in F40/F50 pad shapes.

as far as the cool kids go, they most often mistake my F50s with 355mm rotors for stock R33 brembos... lol definitely no cred, especially since they fit under my 17inch LMGT4s...

[Beer Baron]

BTW a handy pic for all the F40 and F50 club members. it lists the projec mu part numbers and also kindly lists the compatible part number amongst a number of other pad makers.

[Beer Baron]

also the mintex numbers are 1976F*R18.00

and pagid also use 2179 as well as 1287 for F40/F50 pads.

[djr81]

you tried these guys for DS2500s DJR? http://www.zeckhausen.com/Brembo/GT1_Pads.htm

pad choice for F40/F50s is probably second to none. all the euro stuff is available, so is the US stuff and even the japanese stuff is all made in F40/F50 pad shapes.

as far as the cool kids go, they most often mistake my F50s with 355mm rotors for stock R33 brembos... lol definitely no cred, especially since they fit under my 17inch LMGT4s...

Cheers. Cant make sense of their pharken part numbers. 63-360-0810 ??? Guess an email is in order.

Also see here:

http://www.ferodoracing.com/catalogue/detail_car_racing.php?cat=brake_pads&code=FRP3028

http://www.ferodoracing.com/catalogue/detail_car_tuning.php?code=FDSR3028&cat=brake_pads

Oh and it may pay to be carefull on the pad thickness. You can get 16 or 18mm. From memory the 16mm just fit on a 30mm rotor.

The knowledgable cool kids look at my bucket of bolts and say stuff like V-spec 1, yeah? Sorry mate this one is the poverty pack. They assume the calliper is the stock Vspec jobbie.

Edited September 8, 2011 by djr81

[Roy]

Thats the good thing about the black Brembo setups. They look std. If i could find a place that I trust to do cold anodising thats what i want to do to mine...fir the time being fronts are red, rears are black. My old Sumitomo setup was blue and looked more aftermarket, but then again my Greddys were gold,. APs black, Alcons red etc etc

Actually, if someone wants a kick ass Alcon setup let me know. i forgot i had them under the bed

[djr81]

you tried these guys for DS2500s DJR? http://www.zeckhausen.com/Brembo/GT1_Pads.htm

pad choice for F40/F50s is probably second to none. all the euro stuff is available, so is the US stuff and even the japanese stuff is all made in F40/F50 pad shapes.

as far as the cool kids go, they most often mistake my F50s with 355mm rotors for stock R33 brembos... lol definitely no cred, especially since they fit under my 17inch LMGT4s...

I got this back from Zeckhausen.

The DS2500 pads we carry for the Brembo F40/F50 is the FCP1281H, which has the sensor slot, but is 18mm thick. The 16mm version is special order and costs $254.

So now I need to work out if the 18mm pad will fit a 30mm rotor/F40 calliper or I just fkd up last time I fitted pads and hadnt pushed the pistons all the way back.

Of some note is the rotor on the Falcon is 32mm thick & they use a 16mm pad.

I guess the questions is: will an 18mm pad fit?

Perversely if you go through the part numbers the pad fits the rear of an R35.

Edited September 9, 2011 by djr81

[Beer Baron]

that is ridiculous. 18mm pad (so more material), with slot (more finishing cost) is $189 vs a 16mm pad with no slot being $254.

v interesting they are the same as R35 rears. that means any remaining japanese pad maker that doesn't make F40/50 pads yet will be making them soon.

let me know if the 18mm pads fit. I'm sure they will. another 4mm pad shouldn't wreck things. also what thickness rotor are you using? 32mm?

[djr81]

that is ridiculous. 18mm pad (so more material), with slot (more finishing cost) is $189 vs a 16mm pad with no slot being $254.

v interesting they are the same as R35 rears. that means any remaining japanese pad maker that doesn't make F40/50 pads yet will be making them soon.

let me know if the 18mm pads fit. I'm sure they will. another 4mm pad shouldn't wreck things. also what thickness rotor are you using? 32mm?

To them it is a special order or something - hence the stuff around. The ridiculous thing is the $500 the yocals want for the damn things.

Using a 324x30. Just wanting to know if anyone has used an 18mm pad on a 30 or a 32 rotor with a F40/F50 calliper. Someone must have tried it, knowingly or otherwise.

Does the rear on an R35 have a wear sensor - I dont think it does?

[Beer Baron]

not sure if R35 has pad wear sensors, they might.

you would think if the 18inch pad is going to fit anything it'll fit with a 30 but I guess they make the thicker pads to fit cars using these calipers on the rear with little 20 odd mm thick rotors...

maybe try a quick measure if you have a caliper around? 30mm for rotor, 36mm or pack, plus backing, plus piston protrusion = ?

or wait for someone who's tried the 18s or even better buy some and be the guinea pig for the rest of us. and yeah $500 is nuts. at the moment there is project mu titan HC pads for F50s on ebay for less than $200 and they are a good pad too.

[Legionnaire]

Rear brakes on many cars have rotors 28mm thick, I reckon that's the reason for 18mm thick pads.

I don't think 18mm pads can be used with 30mm rotor, they may be 1mm too thick. But with the price and availability difference like mentioned above - $190 for common and easy to find 18mm pads vs. $250+ for a rare 16mm set I would not hesitate to grind off 1mm of friction material from each pad end enjoy the ride

[T04GTR]

using a db1346 pad from a v6 4 runner has a fair bit deeper anulas. and are thicker by about 2mm per pad. so, if using a GTR caliper on the 324x30 upgrade you get thicker pads and a better contact area. hawk do a perfomance compound. ferodo ds2500 is very old hat. there are many better comounds and brands available. pfc for one. also cheaper...