How To Raise Back Of Bonnet?

[lunjiaow]

Hmmm makes me want to try and RIP off that seal, but i dont have a proper gauge/tool to measure the engine bay temperature.

[bubba]

I'm sure Jaycar would have a small thermocouple kit for not much.. <makes a mental note to have a look.. later..>

[lunjiaow]

Well i might buy one of those infrared thermometer, will eventually have to use one at work.

So Chi, hows the temperatures in the engine bay?

[Chi100188]

hmmm i havnet got to do it yet but im doing it when i wake up haha what size are the bolts that u bought? because teh stock ones are too short? and also what MM washers were u using?

Cheers

Chi

Edited December 26, 2007 by Chi100188

[lunjiaow]

Umm, i used 2mm washers, raised it roughly 10mm and bolt length, just get 10-15mm longer then stock.

[Mr. Keets]

"...I will however remove the rubber strip at the back and report back as to whether that + 10mm raise decreases under bonnet temps "

Hmmm makes me want to try and RIP off that seal, but i dont have a proper gauge/tool to measure the engine bay temperature.

Its been done and recommended by some knowledgable cat that works in O'Connor There is a low pressure area at the base of the windscreen...rip out the rubber strip and i guess raising the hood will assist, just recirculate the A/C to avoid sucking fumes into the cab

[Chi100188]

hmmm i've done the raising of bonnet, took out the rubber strip i guess it just minus's a few degrees but nothing dramatic lol hmmm guess vented bonnet here i come

Cheers

Chi

[THENIG]

Has anybody who has done this 'mod' notice their air-conditioning not working aswell or hot air entering the cabin during stop start driving?? The HVAC sucks outside air from the base of the windscreen when its not in recirc mode and by raising the bonnet wouldn't this means it's sucking hot air from the engine bay instead? i actually read up a bit on this a while ago and i think you will find no real conclusive evidence that this helps your water temps, it stuffs up the aerodynamics that is going on inside your engine bay im pretty sure by creating a high pressure system in your engine bay, this stops air from being drawn through your radiator like it was designed to do. Unless your doing static burnouts or slow speed stuff that creates alot of heat without aerodynamics coming into play i would say leave it alone, maybe in certain high mount turbo installations it may be beneficial?? Has anyone got real data on this??

[rev210]

Drops the engine bay temps on an R32 GTR by removing the rubber strip as evidenced by a few degrees drop in intake temp when I last measured it. The down side is fumes.

The raising of the rear of the bonnet is well documented to assist in cooling on many vehicles, I have done it to a number of cars I have owned in the past.

It doesn't fix overheating issues however and if thats the reason for doing it then it's not going to help, there is an issue with the cooling system that needs fixing.