I cant help thinking that Nissan must have done lots of R & D into this, back in the 80s, even in the 90s, they obviously didn't think it necessary to fit one.

Personally I feel that the TTs would benifit from a little more venting, to disperse some of that huge amount of heat, generated under the hood.

 

What are your thoughts on this? (before I start chopping) is it a worth while mod, or were Nissan right not to fit one as standard?.

Yes you are spot on IMHO.There is far too much heat under there that can't escape!I have had vents fitted for years they really do work and you can feel the heat pouring out,only just upgraded my bonnet to a Border.

Getting mine done this week and will put pictures on when it's done.. The Z does generate to much heat and there performance gains to be had in keeping things nice and cool. We all got 2 Turbo's generating loads of heat + 2 manifolds so I'm getting vents positoned directly above those + and outward air duct so air can flow in as well as getting rid of nasty hot air.. Done loads of research into what's gonna work well so this should be fullproof!! :duffer:

of even foolproof !!!

 

Hope your research was good. where did you get the info from. I've read up a bit about where the pressures are greatest and lowest, but every car is different, and the only certain way to check the best position for venting is to measure the underbonnet and above bonnet pressures to ensure the air is flowing from a high pressure area to low pressure area, otherwise it wont flow the way you wont it to.

of even foolproof !!!

 

Hope your research was good. where did you get the info from. I've read up a bit about where the pressures are greatest and lowest, but every car is different, and the only certain way to check the best position for venting is to measure the underbonnet and above bonnet pressures to ensure the air is flowing from a high pressure area to low pressure area, otherwise it wont flow the way you wont it to.

 

Used my old S12 Silvia as an example + also went to the extent of sticking bits of tape all over the bonnet to visulise high and low pressure. I'll be able to explain better when I show the pics next week but it just so happens the Z32 has a perfect bonnet angle for getting rid of hot air. If you positon vents above each side of the turbos then air will pass over causing hot air to be dragged out from underneath the bonnet at quiet a rate (Cool turbo's = better power + more efficient) also if you can do the same for the front rad with the vented reverse bonnet bludge which the Z centre sell that will also do wonders in pulling hot air out.. Gonna measure the temp of the intake plenum today after a good caining sesh then when bonnet vent gonna measure it again with a heat detecting laser gun thingy! (Don't know it's actuall name!!) Whould see a drop of at least 22 degrees.. (sorry to be so long winded!)

Thanks for the advice guys, JONLOWNDES101, looking forward to those pics, before i start work on mine.