I can't believe you guys! The op has a great idea.

That being said flounder please execute operation "cool my engine via. partly popped hood" and post your findings. Before and after pics would be nice also.

Your way off man, silver dollars are where it's at. Only douchebags use pennies.

underhood temps != coolant temps

pop your hood and your underhood temps may go down while your engine/coolant temps go up

Better solution - search through build threads for:
1. Heat shielding on the turbo
2. Isolating/sealing the intake filter from the rest of the engine to form a 'cold air intake' of sorts

And unless you want to project the image of civics and integras running around with poorly made bodykits in gray primer that flap like wings where the bumpers form the wheel wells, and the right door smashed in and you can tell hasnt been fixed in years because of the rust, mismatched 'euro' style taillights, running on 19x5" wheels, and with a obnoxiously loud fart can exhaust that goes from 'weed eater' to 'chainsaw' when you step on the gas, all while a massive black sheen covers your rear bumper because you just decided to run super rich instead of tune the car properly....then close your damn hood, riceboy.

1 and 2 will definitely be on the way. This was only like the 5th time i've actually driven the car since the kit has been installed, thats why i'm running on the rich side. I'm still seeing 14-15 at idle, I just can't get an accurate tune until the wga gets here.

It doesn't even look that bad with it up. Second pic almost looks like some sort of an angry uni-brow.:naughty:

Hey, your hood isn't latched.

Cool, so you just proved exactly what everyone else was saying: that popping your hood allows a shit ton more air overtop of the radiator and not through it.

WHO GIVES A SHIT IF YOUR TURBINE IS 660°F OR 630°F?!!!!?

YOU WANNA KNOW WHY YOU'RE SCARED YOUR HOOD IS GOING TO FLY UP>?!?! BECAUSE YOU'RE CREATING POSITIVE PRESSURE BEHIND IT, WHICH MEAN LESS AIRFLOW THROUGH RADIATOR!!!!!!!!!!!!!!!!!!!!!!

Do you want me to do the math to show you how much power you gained from the filter temps of 131°F to 113°F without an intercooler netted you? cause that's the only place you just benefitted, but at the risk of overheating the motor.

There is only one appropriate response here.

http://img38.imagefra.me/img/img38/8...im_b2b8916.jpg

[QUOTE=Do you want me to do the math to show you how much power you gained from the filter temps of 131°F to 113°F without an intercooler netted you? cause that's the only place you just benefitted, but at the risk of overheating the motor.[/QUOTE]

Sure, that would be great. 21 degree difference at the tb is what most impressed me.

I understand the good/bad effects of doing this but at the psi i'm running and the fact that this is a weekend car with minimal stop and go driving I really don't feel like it's that big of a deal. I have a temp gauge and I will most def be monitoring it closely during these tests. The second I see anything over half way up the gauge, i'll shut the hood.

"However, it is always useful to get more air flow under hood. It is the incoming air flow that pushes all the hot air out."-Braineak from sticky in diy turbo.

Are you intake temperatures actually 23*F cooler...im going with no.


OKAY, Let boost be at 6 psi. The temp gain with turbo is about 14/15F per psi, or about 90°F.

On this 90°F ambient day, ambient absolute would be 90 + 460 = 550F.

The charge temp absolute would be about 550° + intake delta (131-90=41°) + another 90° from the turbo, which comes out to 681°F

Density would degrade by 550/681 = .807

The pressure ratio at 6 psi is 1.41.

With the heat from the turbo, then the 141% more density from compression will be degraded by .80 x 1.41, or to about 1.128.

With the hood popped, you saw intake temps drop 18°F.

Therefore, the charge temp absolute in this instance would be about 550° + intake delta (113-90=23°) + another 90° from the turbo, which comes out to 663°F.

Density would degrade by 550/663 = .83

With the heat from the turbo, then the 141% more density from compression will be degraded by .83 x 1.41, or to about 1.17.

With a 90% efficient IC, .90 of the 90°F temp rise will be taken out, or about 81°F removed, thus leaving a net gain of 9°F. This would leave a density loss of only 2% from the heat, or a net gain of 1.41 x .98 = 1.38

Hood down = overall gain of 12%, or 101rwhp
Hood popped = overall gain of 17% or 105rwhp
Intercooler = overall gain of 38% or 124rwhp

Thanks braineak. Thats the kind of info i'm looking for. Although I certainly hope i'm seeing better whp than those numbers with the 1.8l boosted?

So, there is something to be gained by allowing cooler air into the engine compartment, that's a given. But there are better/safer ways to achieve that goal than leaving the hood up a tad. I'm all for intercoolers but when I bought the non ic'd bypass pipes I was under the impression that they could be used in conjuction with an intercooler, I don't think that is the case and I already dropped $135 bucks extra to get it so i'm holding off on the IC probably until next season.

If the only negative effect of doing this besides the hood flying up and sending me blindly into oncoming traffic is higher coolant temps, then whats the harm in some trial and error testing while paying attention to the ect sensor?

Thanks Brain.

Now to thread jack myself... I just got back from my first freeway run, with the hood locked btw and although she pulls awesome in 5th from 80 to 100 the car shakes pretty bad. Is that the sweet unbalanced chinacharger i'm feeling? Never felt it in city driving?

If your hood flew up you can see under it so no blind driving needed. I recommend for about $40 you:

-Shut your hood all the way
-Seal around your radiator/make some ducting
-drain your coolant and fill it with distilled water and some antifreeze
-buy some sheet metal and make a heat shield

Or for about $250 you:
-buy an intercooler, piping, and fab up something that doesn't suck...you could even (try to) sell your pipes to cut the price down even more

Or add a 5th injector...I agree your turbo is making your car shake. Better get that shit balanced.

lol, I bet you have severe detonation.

Yeah, that's hilarious hustler. AFR was looking good although a tad rich and I can't hear shit for knock even with the windows up. Plus, i have a knock sensor thats hopefully doing it's job.:x:

It is hot as shit out today, i'll wait until it cools down and do another freeway run to compare.

Just because its fat doesn't mean you're free from detonation. That knock sensor doesn't do a god damn thing. Apologize to me for your shitty attitude and I might look at your spark table and tell you what's wrong.

This thread makes me want to club baby seals... with dead babies.

Have at it chief. My attitude isn't shitty, I happen to be a very easy going individual with a great deal of patience for people. If you look at most of my threads, the fireworks are usually coming from others.

background on car. 99 with stock pump and injectors running emb. Seeing around 75-80% DC max with that fuel table and under boost i'm seeing afr's in the mid 10's-mid 11's.

No apology, no assistance.

Just because you are pushing out all the hot air out of the engine compartment doesn't mean a thing for coolant temps. You need airflow through the radiator. To get that airflow you need a pressure differential. IE High pressure in front of rad and low pressure behind hit (relatively that is). The air in front is at a higher pressure due to being collercted at the pressure center at the front of tha car and the air passing the underside of the engine compartment creates a lower pressure zone (thats why you see a difference with or without the belly pan) that creates your differential pressure accross the rad. Now when you push in the higher pressure air into the engine compartment with propped hoods, scoops, or teh raised rear hinge mods you will move air through the engine compartment and lower temps in there a little but greatly reduce the effeciency of the radiator or intercooler or anything that you are trying to suck air through at the front of the engine compartment.
Simply keep your flow through the radiator.

You are doing the right thing by taking measurements and trying to study stuff. Just make sure you really understand what you are looking for.

On a different note. Don't screw with a hood that is not propperly latched! On my first car I had just spent a load of cash redoing the head gasket when on the first test drive at 30 mph, BOOM! The hood flies up, cracks my windhield in three places, bends up the hood and all kinds of sheetmetal as wheel. It was pushed down and I thought it was latched. So, in short, DON'T screw with it.

Your are a certifiable fucking idiot. If you want lower coolant temps, follow the advice given above. If you want cooler air temps, install a fresh air intake. You wouldn't put a cast on your arm to fix a broken leg would you? You fucking dumbass.

And Christ almighty quit with the popped hood shit.