RKTuning New Race Car !!!Build

[bigmikespec]

Originally Posted by GT-R Glenn

Why dont you just run two big electric fans ?
I dont understand that ducting at all.

Someone speak slower for Glenn

Seriously though, that is some serious ducting, looks like an air con system in a new house!

[GT-R Glenn]

Yep, Im a bit thick.
So its to supply cool air to the fans which then blow that cool air across the core, as opposed to collecting whatever air is available ?
Not to supply airflow across the core.
Correct ?

[neilo]

Originally Posted by GT-R Glenn

Yep, Im a bit thick.
So its to supply cool air to the fans which then blow that cool air across the core, as opposed to collecting whatever air is available ?
Not to supply airflow across the core.
Correct ?

Glenn

The air passing the side of the car will be drawn in by the quater ducts either side of the car, the air will then be forced through the pipe work then finally through the radiator.

The air will come out above the rear diffuser because the air which can travel over the top of the diffuser will be chanelled past the underside of the rad as it rushes past out the back of the car. This will create a venturi effect which will help speed the air flow passing through the radiator as the air from underneath will help pull the air from above.

The fan will only come on when needed.

Hope this makes sence glenn.

Neil

[mattysupra]

glen i would guess that the boys are trying to make a system that works without fans (while the car is moving) for the simple fact that 2 fans pulling maybe 20 amps a peice would put load on the altinator (or however you spell it) which in tern will take away engine power.

As this system uses air ducts on the side of the car and i presume the way the air will exit underneath (providing the lads have done there maths and got there heads screwed on, which im 100% sure they have) the air flowing underneath the car will create a vacuum that in tern will make teh side vents suck air in.


Also i would guess that the front of the car will have smaller air vents so again will cut through the air better and reduce drag.

Try and pull a open bin bag through the air fast and it works like a parachute and will cause you large drag, if ron and the boys are doing what im thinking then there system will work like you have a hole in the bin bag and teh air will flow easy so less drag.


Does that make sence? because that hurt my head !

[R.I.P.S NZ]

Wow, sure looks different and it seems like a hell of alot of work for a cooling system.

Any idea how much weight you've added over having a radiator and short hoses in front of the enigne? I expect the entire cooling system would hold alot of extra water with the pipes under the car etc.

Be interested to see how it goes.

Rob

[GT-R Glenn]

Hope this makes sence glenn.

Neil

Yep, perfect, got it now
Cheers

[MIKEGTR]

Originally Posted by mattysupra

Try and pull a open bin bag through the air fast and it works like a parachute and will cause you large drag, if ron and the boys are doing what im thinking then there system will work like you have a hole in the bin bag and teh air will flow easy so less drag.


Does that make sence? because that hurt my head !

You're not taking away the front of the car lol, its still there, so if anything in my eyes having 2 extra scoops at the side of the car will add drag.

As for the aerodynamics argument and the 'vacuum' effect, F1 teams spend months in wind tunnels developing 'blown diffusers' and the like, its not a case of just knowing your maths thats for sure.

[Mook]

Don't forget it frees up a load of space at the front to use a large intercooler and increased airflow

Mook

[neilo]

One thing i do know with wind tunel proof is a car which allows air to flow into the engine bay will not be as areodynamic as one with sealed duct work which allow the air to do it's job and flow back out of the car quickly, otherwise the engine bay is acting like a wind trap.

[freakazoid3]

Calm down guys I love the thinking behind this and it looks like it will really work aswell

Its a lovely piece of art and I can't wait to see this car in action
Keep them pics comming

[MIKEGTR]

Originally Posted by neilo

One thing i do know with wind tunel proof is a car which allows air to flow into the engine bay will not be as areodynamic as one with sealed duct work which allow the air to do it's job and flow back out of the car quickly, otherwise the engine bay is acting like a wind trap.

But surely there is room enough to do this with the current setup, even just moving the rad back a bit and channeling air out in the same manner?

It just seems like a lot of extra work (and weight).

ALso regarding the firewall - To have plastic running thru a hole, doesnt that defeat the object of a fire wall? Especially with Oil Tanks in the boot too?

Im sure you both know a lot more about race regulations that I, but I was just interested to know the view on this.

Thx for all the information and updates, its a good read

[neilo]

Originally Posted by MIKEGTR

But surely there is room enough to do this with the current setup, even just moving the rad back a bit and channeling air out in the same manner?

It just seems like a lot of extra work (and weight).

ALso regarding the firewall - To have plastic running thru a hole, doesnt that defeat the object of a fire wall? Especially with Oil Tanks in the boot too?

Im sure you both know a lot more about race regulations that I, but I was just interested to know the view on this.

Thx for all the information and updates, its a good read

Mike any questions are all good mate as you said makes for a good read.

I understand what your saying about the fire wall but it's within the rules.

This system has taken alot of effort to create but we love it ! LOL so no problem there.

As for the weight the system you see in the pic's are not the final items once everything has been made in fibre glass and where happy with it i'll be making everything in pre preg carbon so the overall weight will be minimal.

In an ideal world a 50/50 split of weight would be great but as i said ealier we are removing weight from the front to the rear to not only help in this task but give better cooling, for example if you have a radiator behind your intercooler it will not see as much air flow as if the intercooler wasn't there as the air's got to pass through 100mm of intercooler core before it gets to the rad.

We know a club racer who has already made the change with a rear mounted rad who has seen significant gains in their lap times so it's got to be worth a go!

I'm not saying the original position is'nt any good but it doeas have it's draw backs.

But who am i to say i'm just a Landscaper LOL.

[mambastu]

Very interesting build. I was looking at doing a rear mounted rad on my RB RS13 a few years ago but didn't want to turn it into a track only car.
Any weight moved from the front of a Skyline to the rear seems like a good idea to me

Out if interest where is the fuel tank going to be ? Is it going to be in that raised area on the rear seat platform ?

[mattysupra]

Originally Posted by MIKEGTR

You're not taking away the front of the car lol, its still there, so if anything in my eyes having 2 extra scoops at the side of the car will add drag.

As for the aerodynamics argument and the 'vacuum' effect, F1 teams spend months in wind tunnels developing 'blown diffusers' and the like, its not a case of just knowing your maths thats for sure.

Hi mate, i think neilo has answered this for me with- "One thing i do know with wind tunel proof is a car which allows air to flow into the engine bay will not be as areodynamic as one with sealed duct work which allow the air to do it's job and flow back out of the car quickly, otherwise the engine bay is acting like a wind trap"


Like neilo has basically said the engine bay will act as a 'bin bag/parachute etc'

I have not seen this car in the flesh yet but from what i have seen in here i think i know what there trying to do! LOL


Going back to F1 teams with diffusers etc, yes this does take some major maths, wind tunnels etc, but i dont think they are trying to make big down force here but more vacuum under the rad to suck air in and out. What they decide to do with the exiting air on the under side of the car to help downforce will indeed need very good maths and a wind tunnel to see if it works!

Im also guessing they are going to have smaller air vents into the engine bay to reduce drag and as they really only have the intercooler to worry about, then i guess with the extra room that the intercooler may also work simular to the rear rad as in it will have a duct maybe that sends air straight out again rather than into the engine bay?

Bit like the oil coolers that some fit into the corners of the bumper so air goes straight back out side rather than forceing hot air into the engine bay.

[RKTuning]

I could have made it easy for myself and gone the tried and tested route , but thats not what i wanted . I wanted a extreme skyline that could challange the fastest time attack cars and also be a good outstanding advert for RKTuning.
The fastest R32,s in Japan are both rear radiator cars, both using a basic large letterbox type opening on the bootlid which looks naff but obviously works.
Having never built a race car from scratch before it,s a steep learning curve, I new what i wanted but along the way you get other peoples input that changes the way to do things but in the end it,s my decision what goes into the car.

I,m sure there will be a few teething problems but in the end it will be a very fast and light skyline which will end up being used for my pleasure and enjoyment and aim at being top of the time sheets and races.

Ron