Jump to content
SAU Community

Recommended Posts

I have the traling edge of my bonnet raised. to be honest I have NFI how much affect it has. the bottome of the windscreen is a fairly low pressure area so it would probably not be drawing that much air though, but giving the air travelling into the engine bay a place to escpape is a good thing. plus when shit goes wrong I will know straight away as oil/coolant/bits fly onto my windcreen!

I've never had a problem with the law, but I do get countless people asking me why my bonnet doesn't shut properly, or telling me I've forogotten to shut my bonnet. one day someone will ask me about it and I will loose the plot and snap them in half. so possible jail time is something to consider before doing it. I don't think it looks bad though.

picture099wj5.jpg

  • Replies 68
  • Created
  • Last Reply

Top Posters In This Topic

  • 7 months later...
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

Did you ever get to do this on your skyline?

Just curious, because i'd like to get hot air out of my engine bay too, and wondered what affect it had on the aero.

can't beat the look of naca ducts but they are designed to force air in and will increase under bonnet pressure. this means that unless there is a good path for air to evacuate from the engine bay - under the car - the pressure will reduce the amount of flow through at the front.

one reason that temps go down with a bonnet vent is that the pressure in the bay is lower and there's more flow through the rad.

i reckon the 32 GTR bonnet with naca ducts would work well - the vaccum created at the rear of the bonnet with the seal gone would pull air through the ducts and decrease the pressure in the bay. anyway it's all conjecture until you get a pressure gauge and a thermometer.

if anyone finds some nice looking naca ducts yell out.

Edited by Scooby

Ive got an East Bear FRP bonnet on my r32 gtst (with the gtr grille). I bought it because it was the only one i found that was subdued (sp?) and didnt look like that fast and furious shit. Its also extremely functional; when the car is stationary, you can feel the hot air being forced out the vent by the clutch fan. Ive not got twin thermos and its even better with them.

The only negative is that it doesnt fit as well as id hoped (im extremely fastideous though), and the cost. It cost me $1700 unpainted, and im still trying to justify that!

Overall though im pretty happy with it. Got it from that place on Silverwater Road in Sydney (i forget the name).

post-11456-1196329157_thumb.jpg

post-11456-1196329200_thumb.jpg

post-11456-1196329238_thumb.jpg

Edited by Shaun

Oh, i forgot to mention that my bonnet comes with a plug type thing that fits on the inside of the vent when its raining. The cost that i mentioned included the bonnet, gtr bonnet latch and the gtr grill.

Shaun.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • I've looked up the parts number (41011AL501). It's around $700 OEM. Usually our Infiniti G35 here in Canada have interchangeable parts with my Stagea but the parts number are not the same. I have looked around and it seems the JDM 2005 V35 Skyline (which is the same as our G35) has the same caliper but I cannot confirm. And I can't find a repair kit. The inner brake pads drags on the rotor, seems to be rusty piston. Thanks for the info by the way
    • This coupled with 6-9 speed autos with ridiculously short gearing is why these modern shitbox cars always seem so fast off the line. If it wasn't for those things, Raptors would not seem fast. The problem we have is there is a driveability gap between a more gentle take off and a wheelspinning sideways launch. The difference between ankle flex required to achieve one and ankle flex required to achieve the other is about 0.5°.
    • Yeah I think I'm also with the opposite here. It's 'hard to keep up with traffic' because in the real world I'm accelerating with 15% throttle and they are pinning it. It feels like I'm being an overt dickhead at anything above 15% throttle, so the car sounds like I'm being an overt dickhead to keep up with/get ahead of traffic when I'm really just trying to drive with traffic. There would be no issue 'keeping up with traffic' if we used the same level of throttle input/aggression to drive around. People really do just drive around with their foot nearly pinned in econoboxes.
    • To be fair it's the other way around. 300kw is boring in a modern Golf or BMW. They are so competent / well-engineered / devoid of emotion that you have to go stupid fast to feel anything. Whereas the <300kw RB still makes all the right noises and it feels good to drive. Can pull off at the lights with the turbo whooshing and the blow-off pssshing and feel like the coolest kid on the block. Just don't look to the side where you'll see the bored housewifes in their shitbox Yaris/Corolla/Camry that kept up because you didn't go fast at all
    • 300kW is so boring in a Skyline, you'll get spanked by someone's mum's Golf with Alibaba pipes, and an email tune.
×
×
  • Create New...