R32 GTR brake duct

[MarusGTR]

Hey guys, after going through my typical late night random googling I came across some GTRUKers that were discussing about this little gem:



They're OEM (some say NISMO?) brake ducts that bolt on the traction arm! So clever and why is it the first time I've ever heard of these? And I want them! Daryl, ever come across these? What's the part number for future reference?

While I'm on the subject of random parts, I'm also recalling the last page of my TSM where a diagram shows the location of an OEM external rear diff oil cooler... never saw any reference to it here or any other forum, ever.

[steveo1502]

Edit

[steveo1502]

Lol, had a set of these on my car, I took em off cause I didn't know what they were for, didn't realize they were part of the duct under the lip, maybe I'll get around to puttin them on sometime

[frankiman]

i made some of those myself, pretty simple

[Skym]

Seen those on a R32GTR in real life. I think was an option, but factory on N1 racecars, etc. Same with N1 front bumper vents.

It's better to have air over whole rotor, not just part of it that could cause warping.

Just like with F1 racecars -





Australian and UK GTR's (R32GTR, R34GTR) had gearbox oil coolers. Diffhead, gearbox, transfer case, fuel, engine oil coolers are N1. Rear diffhead oilcooler requires the N1 backing plate for diffhead that has the holes for fittings on it. I think Greedy sells an aftermarket diffhead backing plate.

Group-A (Gibson R32 GTR Group-A racecar) has the same oilcoolers (get an idea of size, rows) -

http://www.skylinesaustralia.com/forums/uploads/1149927888/med_gallery_1903_124_34003.jpg

[GodziRRa]

Hey guys, after going through my typical late night random googling I came across some GTRUKers that were discussing about this little gem:



They're OEM (some say NISMO?) brake ducts that bolt on the traction arm! So clever and why is it the first time I've ever heard of these? And I want them! Daryl, ever come across these? What's the part number for future reference?

While I'm on the subject of random parts, I'm also recalling the last page of my TSM where a diagram shows the location of an OEM external rear diff oil cooler... never saw any reference to it here or any other forum, ever.

Wow. And I thought brake ducts were just that. Need to get some of those. Is it just black plastic like the brake ducts?

[bobbo]

Group-A (Gibson R32 GTR Group-A racecar) has the same oilcoolers (get an idea of size, rows)

Curious to know what they use to pump/circulate the oil.

[Skym]

A pump similar to that's shown in this diffhead oilcooler kit -

http://www.beastpower.com/p/bmw/vac-differential/VC-BEA-DC-6

Usually have labelled switches on centre console, which you turn on (turns pumps on), or have temperature activated switches (turns pumps on when selected oil temp is reached inside gearbox, transfercase, etc).

[bobbo]

It's better to have air over whole rotor, not just part of it that could cause warping.

If the rotor is turning the cool air would be distributed evenly on the back so warping seems unlikely. The variable to that would be if the rear/inner of the rotor is getting significantly more cooling that the front/outter half..

http://www.beastpower.com/p/bmw/vac-differential/VC-BEA-DC-6

sorry for the off topic discussion but I'm curious to know how critical this would be for GTRs for lapping and time attack use. I'm just about to put my diff back in the car after a COMPLETE rebuild. Would it be worth while to spend an extra $600 or overkill?

[Skym]

Depends on how high oil temps are getting inside diffhead on racetrack and what oil temp the oil breaks down at????? With rear diffhead it has hot air exiting from back of engine bay and running under car, mounted next to hot exhaust, etc.

From what I understand, if keep oil at around operating temp it last's 2x longer. That's why N1 GTR's have them, as they are used in 24 hour races (Nurburgring, etc). Group-A racecars (including Gibson GTS-R) had those oilcoolers (switch activated on GTS-R).

[MarusGTR]

http://www.beastpower.com/p/bmw/vac-...al/VC-BEA-DC-6
sorry for the off topic discussion but I'm curious to know how critical this would be for GTRs for lapping and time attack use. I'm just about to put my diff back in the car after a COMPLETE rebuild. Would it be worth while to spend an extra $600 or overkill?

I think the cooler is more to curb oil breakdown during high endurance events... so with 600$ you have what, 7-10 diff oil changes? :P

[Skym]

If the rotor is turning the cool air would be distributed evenly on the back so warping seems unlikely. The variable to that would be if the rear/inner of the rotor is getting significantly more cooling that the front/outter half..

Exactly, taking into account car is moving forward and air is moving from front to rear of car that can change direction of air getting diverted by that plate, so air is forced to middle / rear of rotor while rotating. So I see what you mean by getting distributed to each vane inside rotor when rotating. But it's only cooling part of rotor / surface.

The ducting that they created on F1 cars diverts air moving from front to rear of car, over the round part of ducting. So air entering ducting gets to whole rotor surface (inner which goes from middle of rotor, through rotor and exist's through holes in rotor. Also onto outer surface where brake pads are for additional cooling) without interference.

Every design has it's + and - and F1 design is probably as close to perfect as can get it.

[bobbo]

^^^Agreed and lets face it we could probably count on one hand how many cars on this forum make it to the track and are driven to the point of requiring additional brake cooling.

[326_godzilla]

I always thought this was standard to the GT-Rs. Me and my buddy saw this on my car and he explained the idea behind it. Also he's noted the slits on the front lip is actually functional.

Good to hear, I guess I got lucky

Thanks for sharing man!

[dsmart]

Yeah I figured the front brake cooling ducts and deflectors were standards bits on the R33GTR. Mine came with both items...I guess they could be optional or maybe only standard on the Vspec?