has anyone removed their restrictor plates from the hood vents on their ralliart/evo x? if so, have you noticed any problems with wind turbulence or water getting in? also, have you checked intake air temps for any change? (i know that last one's a stretch, but i thought it's worth asking)

 

Is that for some chunky engine mod? -- because otherwise you're unlikely to see any benefit at all from removing the plates.

 

http://en.wikipedia.org/wiki/Bernoulli_principle

It will lower underhood temps. This is never a bad idea.

 

not always. some times engineers spend tons of hours figuring out how to best flow air though, under and around a car for less drag and more engine cooling

 

Yeah, because they have to balance looks with reliability with performance. There is NO questioning that removing those plates will alow more flow. The question is if you want rain to get in there. I dont so they are staying on.

 

not if it is getting some of its air from underneath the car. just cause you have bigger holes in the hood dosnt mean the air is gonna flow better

 

im not saying that it wouldnt get more air flow, just that there is a possiblilty that you wont. plus you prolly will get water and other crap in there as well.

 

Agreed with Blaze. It is possible that you won't get more flow. A good example is the stock VIII and IX undertray. There have been people that have recorded 15 degree higher tranny temps with the undertray off. There are passages that push the air up for cooling (back side of the rotors, directing toward front mount as well)

That said, I don't know the X and I'm not saying removing the hood vent plates won't result in more air flow, just saying there could be the possibility.

 

We are talking about restrictor plates, not the undertray.

I posted a link for my reasoning that actually involves a principle. All thats been posted since is speculation. The undertray is a great feature to the car and is often added to most cars prepped for track. Infact, its best to make the bottom of the car as smooth as possible and use the hood vents for cooling.

I guess lambos/ferrari/vipers/veyrons got it wrong.

 

do it and record engine bay temps ang get back to us

 

I have done it on my dsms. And ofcourse it lowers engine bay temps, which lowers coolant temps, which lowers my oil temps...

This is nothing new. I understand that the RA is different from a dsm, but its not exempt to the same forces.

 

i dont think you are getting what i am saying. thats ok.


to the op, you could gain more air flow but then again you may not. only way to tell is to talk to someone who knows more about the car's design, or take em off and record air temps in there.

 

The vents may or may not increase flow. The fluid principle your talking about can only be loosely traslated into airflow and usually only under conditions where a certain amounts of the air are fixed pressres or not turbulent. We have exhuasts in various places in the helicopters that I assemble that are "blocked" from air flowing directly throught them, but they flow more because the pressure at the vent is less than it would be unblocked, hence greater flow. Hope that helps any, let us know what you find.

 

yeah, i really want to plug in with a tactrix cable and record intake air temps and coolant temps both with and without the restrictor plates. i also want to try it without the intake snorkel. if i ever get around to it, i'll let you guys know what i find.

 

No, it won't do anything significant for performance or temps (yes, it will have an effect, just not a meaningful one) -- and while wikipedia's terrible exciting, I'm a university prof in engineering who specializes in fluid mechanics, so please spare me the pop-science lessons (not claiming to know everything about fluid mechanics -- far from it -- but it's fair to say I won't learn much from wikipedia).