Cooling Requirements For Gtr Track Use

[pnblight]

Hi Guys,

I was chancing some informed opinions on the cooling requirements for reasonably well power GTR (500rwhp+). This is a street GTR that will see track days and hill climbs etc and i'm trying to put together the best package i can for reliability as WA can get a bit on the toasty side at times.

GTR R33

will have fully built motor CP pistons/Pauter rods/June oil pump/Nismo mains/Tomei big ends/Tomei cams etc etc

and i am current building a custom 9 litre sump fully baffled

COOLING (all new to go on to the car)

G-reddy 48mm radiator

Biltz 102mm intercooler

19 row oil cooler /apexi relocator with -12 speed flow fitting and braided line

my other places of concern in the cooling area are the front brakes as i have already over heated them once on a track day and i am concidering removing the back dirt shields and constructing some ducting to guide air flow on to the front brakes.

BUT the main question is there any other issues i should be looking at in relation to cooling ie gearbox/transfers/diffs etc

[Beer Baron]

all sounds good to me. i have removed the backing plates from my front bakes and i think it makes a small improvment, but i think if you have 500+rwhp (~350kw??) you should probably look at a larger rotor and possibly bigger callipers to go with it.

[djr81]

BUT the main question is there any other issues i should be looking at in relation to cooling ie gearbox/transfers/diffs etc

<{POST_SNAPBACK}>

Hello Pete,

If I can suggest the best person to talk to would be Jamie who runs (with his Dad) an R32 GT-R at Wanneroo & also in the SES you refer to. There is a hill climb on Saturday 5th (At Wanneroo) & also the combined short/long course sprint in December.

From what I understand the biggest problem will be keeping the brakes cool - which your intention of removing the stone guards & ducting the rotors will help.

As for the remainder - the drive train should be able to live with three laps of Wanneroo at a time. This is only three and a bit minutes of flat out motoring. Hill climbs are even less. Not that I have your sort of horsepower, but cooling the drivetrain is not an issue I have had.

Cheers

Richard

Edited November 1, 2005 by djr81

[pnblight]

all sounds good to me. i have removed the backing plates from my front bakes and i think it makes a small improvment, but i think if you have 500+rwhp (~350kw??) you should probably look at a larger rotor and possibly bigger callipers to go with it.

<{POST_SNAPBACK}>

Yes i wish i could justifier and budget a nice big set of brakes but they are a bit beyond my means at the moment i hope to just try and get the most out of the brembos

thinking of trying some Endless cc-x pads as well as the ducting

Hello Pete,

If I can suggest the best person to talk to would be Jamie Wholagan who runs (with his Dad) an R32 GT-R at Wanneroo & also in the SES you refer to.  There is a hill climb on Saturday 5th (At Wanneroo) & also the combined short/long course sprint in December.

From what I understand the biggest problem will be keeping the brakes cool - which your intention of removing the stone guards & ducting the rotors will help. 

As for the remainder - the drive train should be able to live with three laps of Wanneroo at a time.  This is only three and a bit minutes of flat out motoring.  Hill climbs are even less.  Not that I have your sort of horsepower, but cooling the drivetrain is not an issue I have had.

Cheers

Richard

<{POST_SNAPBACK}>

December ah well the last box of bits were just dropped on my deck and i'm about to go home early and start bolt the big girl bad together, might be ready in time

what about at collie where you can run up to 6 to 7 laps at the least, i would like to aim at a bit longer period of hard running.

pete

[KamikazeR33]

just on the cooling issue with radiators n stuff, do r33gtst's radiator fit exactly the same as r33 gtr's in terms of inlet and outlet from the engine n waterpump?

[djr81]

Yes i wish i could justifier and budget a nice big set of brakes but they are a bit beyond my means at the moment i hope to just try and get the most out of the brembos

thinking of trying some Endless cc-x pads as well as the ducting

December ah well the last box of bits were just dropped on my deck and i'm about to go home early and start bolt the big girl bad together, might be ready in time

what about at collie where you can run up to 6 to 7 laps at the least, i would like to aim at a bit longer period of hard running.

pete

<{POST_SNAPBACK}>

To be honest I run out of brakes long before anything else. The brakes get a bit of a pasting into the chicane & then again into the hairpin before the strart/finish line. If you are running proper race pads you should be ok. Endless are not exactly cheap, but it would pay to give the grumpy old bugger at racebrakes in Melbourne a call. You should find they can sort you out with something that will be happy above the 600 degree mark & also with a decent friction coefficient (mu of about 0.5). Unfortunately they don't work from cold, so you really need to fit them up for a track day & then remove them again.

I looked at the prices for proper brakes - ended up scared.

Hopefully will see you at Wanneroo. The calender is at www.speedeventseries.com

[Beer Baron]

absolutely true. i also run out of brakes before anything else! i will be trying some different pads again at the next sprint i do at either eastern creek or oran park.

[Roy]

I wouldnt be too concerned about the temps of gearbox, diffs etc. I have it on pretty good authority that the technology in oils these days is good enough that you wont damage anything doing a handful of laps. If you were going to be knocking out 15 laps...then that would be different.

Also look at the underbonnet temps. As these are just as likely to end up damaging things as high fluid temps..make sure wiring, hoses, fuel lines etc are all in good condition and not near anything hot or that will move.

As for brakes temps etc...lol GTRs seem to need big brakes Think about it, they weigh 300kgs more then a V8 Supercar, have similar power, and have less corner speed with poor ducting.

Also dependign on the number of laps you are doing, a 19 row oil cooler will want a good supply of air if its to help cool the power you are making

[Gav]

Interesting that the Australian delivered GT-Rs had a transfer case cooler, however I haven't heard of this being much of an issue for 'Rs without this fitted.