How To Raise Back Of Bonnet?

[Chi100188]

Hey guys im just wanting to know how to raise the back of the bonnet so the heat escapes better? because my car heats up to 85-90 on a 40 degree day so any help would be appreciated my car is a R33 GTST S1

Cheers

Chi

[infamous_t]

Mate did it on his 31, I'm pretty sure its just washers/spacers between hood & hinge.

[lunjiaow]

Dont raise it too high, or you wont be able to open the bonnet yourself again, making it a two person job.

[bubba]

You can't go too far with washers, I spaced the bonnet on my 32 with 10mm steel spacers that I had my fitter mate make up (needed to get longer bolts too.. I just went to a local fastener place) and it opens fine.. although it is a little springloaded due to touching the timing belt cover

[Chi100188]

hmmmm so basically washers and thats it aye? hmm how effective is the cooling ? or would it be better if i got a Z-Tune style vented bonnet? or even the Top secret style bonnet for my R33?

Cheers

CHi

[burnsie]

i put bout 7 or 8 2 mill washers on mine and its works fine

[Chi100188]

hmmm do i have to undo the fender ? since like the nuts that hold the bonnet thingy is under the fender well half way under the fender hmmm and would i also have to get longer bolts?

Cheers

Chi

[ryano]

hmmm do i have to undo the fender ? since like the nuts that hold the bonnet thingy is under the fender well half way under the fender hmmm and would i also have to get longer bolts?

Cheers

Chi

Ha ha, it already says in this thread that you need longer bolts. Anyways just try it and see if your temps are lower. Worth a go. Post up any results if you do it, would be interesting to know how well it works.

[lunjiaow]

Well took these pics just then.

Probably used about 20 washers, 2 longer bolts for the rear with 2 washers so that the end of the bolt wont hit the bonnet denting it.

I dont think this makes much of a difference in cooling down the engine bay. unsure if heat even escapes from there as there is a seal between bonnet and that plastic panel.

[Chi100188]

i read from the force inductions forum that like apparently it does lower the temps cause the air escapes easier or something...i also saw the Just Jap R31 drift car with its bonnet raised real high too hmmm ill givet his a go tomorow hahah soooo wheres a place i can find some bolts that are a bit longer ?

Cheers

Chi

[lunjiaow]

Could try, bunnings, repco, autoone, supercheap (apparently having up to 60% off tomorrow), autopro.

Hmm depends how high you want i guess.. well i raised mine and had troubles with the bonnet latch, so i had to put spacers (1cm nuts) behind the raidator support where those two 12mm bolts are.

[bubba]

I got my bolts from a Fastener mob in Welshpool, pulled up, popped my bonnet, removed one bolt, went inside and asked for something to match but 10mm longer.

I had started out with washers but when I wanted to bump it up to 10mm I had my mate make up a couple of 25x10FB spacers with appropriate holes, if I could find my camera!! I'd take some photos

[Chi100188]

so does it actually work bubba? like is it cooler ur engine bay or water temps?

Cheers

Chi

[ix9]

I doubt it.

Go Rally car style and cut a giant hole in your bonnet then some thermo fans on the front of your radiator and duct it through. Now THAT will have some cooling effect. But Effort++

What's the main reason for wanting to cool under bonnet temperatures anyway dude?

[lunjiaow]

You might as well get an aftermarket bonnet, if you want dramatic cooling.

[Chi100188]

yeah i think im going to get a Z-tune style bonnet lunjiaow but for a temporary fix ill just do teh washer hahah, yeah strich9 the main reason i want to cool my car down is that yesterday i went to the car wash doing normal driving and i hit like 90 degrees....max 94 degrees...so i was abit like WTF...hence why i want to do something to cool it down mmm i think ill get some thermo's and a Ztune bonnet perhaps that'd work good cheers for the help aye guys

Cheers

Chi

[bubba]

I did it for clearance.. RB30 and all

My engine temps never really get high except when you're doing burnouts in 43deg.. got to the top of the gauge twice today and a short trip down the road cooled her down again. I didn't lose a drop of coolant either while my mates xr8 emptied all of its coolant! stupid australian cars can't handle a burnout in australian conditions!

Also, I wouldn't have noticed any drop in water temps after raising the bonnet as it always sits at whatever the thermostat opens at.

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

Edited December 26, 2007 by bubba

[Chi100188]

hmmm so whats the max amount of washers or max MM i can go b4 i can't close my bonnet at all cause tomorow im going to go buy the stuff and rip that rear rubber seal off and see if it lowers temp

Cheers

Chi

[lunjiaow]

I dont think you have to rip off the seal. you can gentle take it off the clips, leaving them still on the plastic panel so in future you can put the seal back on.

[Chi100188]

ahh alright haha u know i was just kidding about the ripping part im a gentle person

!