VR4 Bonnet Vent For Improved Airflow

[PSIfer]

Will be adding a bonnet vent to the VR4 to improve airflow thru the intercooler, radiator and oil cooler, thus improving their efficiency.

Has anyone done some testing to determine the best location for siting a vent/scoop on the VR4 bonnet?

Autospeed.com shows how they did such testing on their cars here http://autospeed.com/cms/A_2162/article.html

Not interested if you just wacked a vent/scoop/hole in your bonnet without testing before/after.

.........

 

[Dean]

excuse my ignorance, but how would a vent in the bonnet improve efficiency to the Intercooler, Radiator & Oil Cooler?
The only suggestion i have would be a radiator diversion plate which will make sure air getting through the front bar will be directed towards the radiator.

 

[Liberoz]

BTW to add to the above, I have never seen race or rally VR4's with added bonnet vents and Im sure they would be putting out alot more heat in there fully worked Galants than your streeter.

Do it for looks if that's what your after, but its definitely not a necessity.

If you are having over heating issues? I suggest finding the source of your overheating rather than resorting to cutting holes in your bonnet to try and band aid fix the issue.

GL with it though

 

[SIVART]

I havent seen anyone fit evo x bonnet vents yet

 

[GVR40]

Hi judd, not going from personal experience, but from what i have seen most factory vents seem to sit above the manifold/turbo to draw heat out of the engine bay. i remember reading something a few years ago about a 350z that had been worked and they put big vents in the front of the bonnet to try and give it more downforce (forcing the air that had passed through the radiator and intercooler up over the top of the car).

 

[JAP63]

As above, it mostly extract heat from the exhaust and turbo, but also allows a draft effect to go over the radiator and out the bonnet, like a venturi..to cool things a little better.

 

[EVOCPE]

Or throw a few spacers at the rear of your bonnet hinges so it sits higher at the back

Allows the air from the engine to blow out near the windscreen

 

[JAP63]

Or throw a few spacers at the rear of your bonnet hinges so it sits higher at the back

Allows the air from the engine to blow out near the windscreen

If your gonna do that, u may as well remove the seal around the firewall

Then it rains and all the water runs off the scuttle panel into the engine bay!

 

[brisvr4]

If your gonna do that, u may as well remove the seal around the firewall

Then it rains and all the water runs off the scuttle panel into the engine bay!

Just don't let it sit around in the rain then
The cowl is a known high-pressure area which actually draws air into the engine bay rather than letting it out. Lifting the rear of the bonnet will help when the car isn't moving though.
Look up cowl induction and have a read. Pretty interesting stuff!
P.S - Now I'm showing my age talking about cowl induction

 

[EVOCPE]

http://img225.imageshack.us/img225/5465/dscf1194sj1.jpg

I've never had a problem with water runnin into the engine bay

 

[bazeng]

If it rains, just go faster!!

 

[jerome266]

Actually an interesting read
http://autospeed.com/cms/A_2162/article.html
autospeed do alot of great trial and error testing

 

[CLuTZ]

The heat used to POUR out of my vented VR4 bonnet whilst stationary. Good for reducing heat soak, but thats about it.

 

[Liberoz]

Or throw a few spacers at the rear of your bonnet hinges so it sits higher at the back

Allows the air from the engine to blow out near the windscreen

Great idea Mik but when you are travelling down a freeway and you have an opps in the engine bay and either steam or oil goes all over your front wind screen, I wonder how good you will be able to see through a covered windscreen lets just hope it never happens when your taking a corner.

IMHO its a risk do it at your own, Getting back to the main topic is this an asthetic issue or an over heating issue?