Silvia Club of NSW

I had a quick search and didn't really find what I was looking for.

Since I go to the track every now and then, I was thinking that it might be a worthwhile investment to get an air diversion plate for my S15.

What I want to know from other people's experiences is what difference do they make to the temperatures at the track?

If its hardly any difference then I won't bother with it at all.

As far as I can tell, they don't make much of a difference. If you really wanted more airflow through your radiator, you'd have to build a full tunnel going to the radiator. If you just use the diversion plate by itself, any gains in airflow will probably be lost to either side and under the radiator.

In my opinion, you'd be better off getting the holy trilogy of gauges - water temp, oil pressure and oil temp. Then you can add ducting for more cooling if it's necessary.

theyre about as good as a master cylinder stopper... wank factor for your engine bay.

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Alright so the verdict so far is that its a waste of money. Better off saving the money for a better radiator and oil cooler then.

what actually will make a difference, if uve got an aftermarket front bar, create some ducting from the vents in your front bar back to your rad support.... more air gets out there than over the top..

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formerly 3AM

I've got the standard S15 front bar. It does a decent job of directing air flow?

And seal the gaps with door sealing foam tape.. (cheap from bunnings in all sizes and lengths, its double sided tape with foam on one side, sticks to vents and makes sure all the air goes through and not around

as said get the guages firstly, never rely on stock guages if you plan on going to the track, and there's no point changing things unless it becomes an issue, so with guages installed, hit the track and keep an eye on the temps, if they go too high then do something about it

A larger radiator, a few sellers on ns.com have them pretty cheap, and then maybe an oil cooler kit too if problems persist

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i need more power, preferably yesterday

Ah, the mighty rice plate.

There's no substitute for actual empirical testing (measurement, people) of the situation. Those people I know who actualy have water temp guages report some variable results but normally everyone can confirm a measureable improvement on trackdays, etc. These are the kind of folk who might even have an EGT amonst their dash-bling, so I am tempted to believe them.

Usually the comment was that the reduction was on par / bit more / bit less than that achieved by installing the phat aluminium radiator. In either case, about 2 - 10 degrees difference but usually around the 2-4 degrees. The amount of reduction doesn't really seem to be affected by the shape of your front bar, or maybe not.

The moral is, borrow a mate's one and have it copied in alloy or SS. For less than $50 bucks it is a value mod. For a $300 or more "carbon" version, buy that radiator instead.

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Too crazy for Boystown ...............
Too much of a boy for Crazytown..
Almost too crazy for NSW town

so your saying that a air diversion plate has atleast the same if not equal effect on coolant temp's as a aftermarket 40mmish radiator?
are you on crack?

no piece of thing plate is going to replace a larger radiator or oil cooler... if you realy must have one, high octane racing do a plastic one for roughly $50....

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Yes, I'm on crack. ask someone who has tried it then and see what they say.

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Too crazy for Boystown ...............
Too much of a boy for Crazytown..
Almost too crazy for NSW town

ive tried it on more then 1 type of car on different track's... you are on crack

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Yo Chris!

hmm
remember, u got the aircon condensor thingo infront of the rad.

for the price of brand name diversion plates, u can get ful alluminuin dual core 42mm radiators for the same price.

i got my one from a seller named ASI on ebay
full alu. used it on the track with no probs.
$290 all up

i don't agree and happy to prove as I have a 40mm radiator already. I have also found Motul 4100 keeps water temps lower than Motul 8100 but the car is less responsive. Nothing is free....

^^^ What are you on about????????????

There talking about air divertion plates and are saying its better value than a air plate of cause an air plate with a rad cant hurt....

And yes 4100 oil will keep temps lower than 8100 cause 4100 is Semi-synthetic and 8100 is fully synthetic.
And synthetic oils have less heat asorbing properties than Semi-synthetic or mineral oil.

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Disclaimer: If you have'nt worked it out by now I CANT SPELL FOR SHIT.