Bonnet Venting

[DJRIFT]

hey mate, i recently got a z tune vent moulded into my 32gtr bonnet i noticed around 15+ degree drop in engine temp.

and rain gets in. but i dont really notice it bieng dirty or anything. just made sure the seal around my cam covers and coils is in good form!

just adding to the thread after reading the rest of it.. i have been pulled over by police on a number of occasions and nothing ever mentioned about the bonnet, or headlight.. or anything for that matter.

oh and id like to say that is the best cai i have ever seen. love it.

[No Crust Racing]

Has someone got some pics of a raised bonnet?

[Yawn]

It's to allow hot air out, that's why it is positioned above the turbos; that's also why i like the bonnet i posted.

Hot air rises

Ahhh, makes sense How much of an effect on cooling would u think it has tho, i mean that vent is pretty small probably not even palm size. I have to admit it looks pretty nice tho, clean and subtle. Cops wont even give it a 2nd glance.

[Yawn]

Has someone got some pics of a raised bonnet?

It doesnt look that bad, but its still noticeable. Just imagine ur normal bonnet raised maybe an inch at the part nearer to the windscreen. It sorta looks like some dodgy panel work has been done. Haha their everywhere around here in Malaysia, seems to be pretty common unlike in melb.

[No Crust Racing]

Something like this would be good I reckon.

http://www.j-spec.com.au/list/index.php?ID=9223

[Yawn]

Something like this would be good I reckon.

http://www.j-spec.com.au/list/index.php?ID=9223

The one vented bonnet I do like is the do-luck one. It has those fins that arent too large and over the top but still looks like it would do a proper job cooling. Ive never actually seen one of those do-luck bonnets on a real car before tho

[blk180]

heres mine

and what i like

i will have to put the stock bonnet back on and see if theres any differance.

[Yawn]

heres mine

and what i like

Ah, the do-luck one i was going on about looks like your bonnet just without that centre part that you like. Haha

[No Crust Racing]

That bottom one is the style I'm after, looks good.

[Zappn]

edit: actually I don't think they're naca ducts now I look at it, looks more like their designed to use the flow of air above the bonnet to pull hot air through it.

the vspec r34 bonnet duct is a NACA duct.

http://en.wikipedia.org/wiki/NACA_duct

[DJRIFT]

bonnet venting with spacers under the hinges pic can be found here

http://www.pbase.com/nismo13/image/72986437

[GTRsean]

Anything that gets rid of heat is a good thing but, I remember someone mentioning that rear facing vents towards windscreens are not allowed due to risk of oil etc spraying on windscreen?

[andz]

vents are good to lower temp..definately

but wat about rain water getting into the engine?

[GTRsean]

vents are good to lower temp..definately

but wat about rain water getting into the engine?

A valid point there... Electronics in general don't like water or moisture that much.

[psi]

I'm looking at a naca duct.

I have not been able to find a good one yet..

The R34 GTR V-Spec 11 and Nur edition have one in the bonnet..

That is what I'm after.

No bling.. just function.

Porsche 924 have them, lotus, some farrari's.. gt40 even the old forb XA GT had them..

but I still have not found a good one!

Anybody got one?

Please PM me!

Cheers.

Aaron

[Yawn]

You can buy a bonnet with a naca duct already installed in it from japan, like a one piece thing. I almost purchased one but then i figured its too much to pay for such a small vent? Im not even sure if it'll work well at reducing underbonnet temps. So in the end i got a shift sports bonnet, with the large centre drop vent behind the radiator which will most probably do its job at cooling. I also got a matching vent cover in case it rains/hails whatever heh :sorcerer:

Edited April 14, 2007 by Yawn

[nzm033]

anyone know how rain would affect ur engine...ie rust easier/quicker?.....water falls into ur engine and blows ur cylinders?

say u get a z tune bonnet for u car and u park it outside everyday and it pours wat r u gonna do?

or say u goto work and u have to park outside for 8 hours and it rains for those whole 8 hours?

how will this affect ur car?

[blk180]

My bonnet the rain falls over the radiator not on the motor.

[rev210]

R32 GTR's have a raised bonnet at the back from factory, just remove the rubber seal.

[T04GTR]

ON A TT SUPRA we did some testing at wakefield with streemers on the front bar and on the tip of the bonnet. and on the straight the ones on the grill and upper of the intercooler they were pointing forwards lol. the only thing pulling the air thru the radiator was the engine fan.

thisa was with a louverd bonnet. and a standard bonnet. and no bonnet. all made no differance to watertemp. the only thing that worked was having the intercooler cut in half so the radiatio gets its own air. and a curver partition seperating the rear of the cooler fronm the radiator area. with the cooler venting thru naca ducts on the bar.

also lifting the bonnet is a good trick. but the air doesnt go out of it. but back into the bay and pulls the air under the car.

im gonna try the same idea on my car at our next test day. cos ive got the same issue. at high speed it just gets hot. im no aero dynamacist but im learning