GT-4 hood vent, why is it where it is ?? Options

[popstar]

the vent in the hood of a GT-4..... sorry i don't see how it works in the posititon it's in ????????????

as the intercooler top box sits between the vent and windscreen !

i have a plastic rain trap to catch any water, thus stopping any flow of air
plus i've got 1" of insulation to the underside of the hood !!!!!

if it's ment to help cool the top box of the intercooling system, them surely there need to be a through flow of fresh air via that grill and out of the rear hood slots !!

anyone ???

anyone understand what i've said ?????

[CoSo]

Doesn't the air enter through the grill on the bumper?

Also, some people have removed the bonnet insulation without much problems, (allows for better cooling, but I also hear it screws up the temperature sensor and allows rain to enter the engine bay.)

This post has been edited by CoSo: Jul 14, 2005 - 11:46 PM

[Consynx]

the water to air intercooler stays cool on its own but can get some heat soak which is real bad, because of waters characteristics

it will take longer to get heat soak becasue it is water, but when it is hot, i will not cool down as fast.

therefore that vent is there to let as much heat as possible OUT of the hood, and away from the intercooler

[popstar]

ok that what i thought....

my '4' is stock, what i described is what i have........
i just don't what good the vent actualy does on the street car ?????
and surely have the grill over the cool would make more sence ???

'yes air does enter at the front very well'

i'll try and post some photo's in a bit !!!!!!!!!!!!

[Consynx]

run the car a bit hard and come to a stop
the swappers in the US w/the vent say they see heat rise out of the vent...
so yea, it should work for street use.

[popstar]

yeah i see the heat rising and in the winter with the snow falling i get steam

it's just the vent is over the manifold not the cooler........ and with it being so damn hot here at the moment, i'm getting an over heating problem in traffic due to lack of air flow.......

i just think the grill is over insulated ..... maybe i'll cut out the insulation under the grill and see what happens then ?!?!?!?

[Consynx]

if you decide to go sidemount or front mount, and shipping isn't much
someone on here may buy your water intercooler
i understand what you're saying now...

[lagos]

the vent sits right over the HOT exhuast manild and turbo to vent all the hot air produced by the manifold/trubo (ever see pics of exhaust manilfolds glowing? thats a lot of heat) .

you shouldnt have any hood insulation covering the vent. if u do, then its probably something a former owner could have done. i would recomend cutting out the hole so the vent can do its job. rain, or snow will not harm anything.

the stock intercooler is water to air, meaning that its filled with engine coolant, that is connected to a pump, that then goes to a small radiator that is mounted to the front of the car. if you are getting any heat soak in traffic, i would recomend adding in an intercooler sprayer on the heatexchanger, or maybe a small fan.

what do you mean when u say your are getting over heating problems in traffic? does the motor just seem slower because of heatsoak, or does the temp gauge in the car go up ?

edit: also, you should doubble check that the intercooler pump that sends cooant from the topmount to the heat exchanger is working correctly and that your intercooler is filled with the correct amount of coolan.

This post has been edited by lagos: Jul 15, 2005 - 12:51 AM

[Consynx]

^
what he said
also, here's a pic of the bottom of ^HIS^ hood

that's what it should look like

[CoSo]

you shouldnt have any hood insulation covering the vent. if u do, then its probably something a former owner could have done.

Actually, I'm pretty sure some stock gt-four bonnets (or hoods) did come with insulation, which does cover the vent.

[lagos]

you shouldnt have any hood insulation covering the vent. if u do, then its probably something a former owner could have done.

Actually, I'm pretty sure some stock gt-four bonnets (or hoods) did come with insulation, which does cover the vent.
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that would be a very dumb move on toyotas part if they did that. it would basically make the vent totally useless.

[CoSo]

(as per the discussion on ozcelica.com http://www.ozcelica.com/forums/viewtopic.php?t=1544)

Some ideas on why there is insulation: keeps bonnet itself cool, might prevent paint deterioration on the bonnet, reduce engine noise, keep the temp sensor stabilised, keep the engine warm in colder climates, keeps water and dirt out.

[popstar]

Here's a photo of my 100% stock JMD hood



this is why i asked the question.........

as for over heating of engine, it just gets really slugish, so heat soak i think
best i cut the insulation out i think !!!!

[Consynx]

lmao, cut that ish away

[lagos]

i would just cut out the hole where the vent is, and keep the rest of the insulation.

did you make sure your hear exchager pump is running correctly and that the intercooler has coolan? i would think that the water to air IC would have very little heatsoak issues.

[popstar]

i'm gonna cut out the insulation from the front lip to the back of the vent some time today!

you can just see where the plastic rain trap shows at the front......
i'll leave the rain trap for now and see !!!!!!

i just don't want the engin full of snow at -40 in the winter, cause i'm sure that couls harm the engine........

yeah checked pump and coolent levels yesterday..... both are fine....

This post has been edited by popstar: Jul 15, 2005 - 2:00 AM

[Mr_E]

the vent sits right over the HOT exhuast manild and turbo to vent all the hot air produced by the manifold/trubo (ever see pics of exhaust manilfolds glowing? thats a lot of heat) .

Exactly boss. I have a permenant heat haze pouring off my car when sitting still.

you shouldnt have any hood insulation covering the vent. if u do, then its probably something a former owner could have done. i would recomend cutting out the hole so the vent can do its job.  rain, or snow will not harm anything.

The ST205 is stupidly over cooled. It comes standard with underbonnet insulation and a metal plate over the centre grill. I've been out on track with that setup and driven very very hard indeed with no movement at all on the temperature gauge.

Having said that, any way you can get rid of heat is good, and less weight is more speed. Don't cut a hole, rip the whole lot off (wear a mask, as it's nasty stuff) and bin it.

Then laugh at the heat haze and scare other traffic when raindrops hit the front end and *boil*.......

[BlackCelicaGT94]

run the car a bit hard and come to a stop
the swappers in the US w/the vent say they see heat rise out of the vent...
so yea, it should work for street use.
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I got nothing under the hood and see the heat coming thru my hood :-)

[lagos]

popstar, dont worry about water or snow. ive had my hood for 2 years now ... snow will not fill up in your engine bay and it will not cause any problems to yours motor.

[BlackCelicaGT94]

Yeah i live in Seattle and it rains just about everyday - matter of fact it was raining just an hour ago (rain in summer sucks) and its never done anything bad to my hood and ive had my hood 2.5 years!

[popstar]

thanks guy and girls

i'll see how no insulation works first, it was better over the weekend !

as for the temp' gauge ! no that never moves the engine just get un-responcive if i site in traffic a long time and even with my intercooler heat sensor disconected ! i still get the warming light on to say it's over heating....... two mins on the open road will then cancale it .....

[Andy B]

One of the best things to do IS to remove the under bonnet padding. You are suffering from residual heat build up, which on a four is a bad thing. Try to get as much air flow into the engine bay as you can, and let the heat in there disperse.

A front mount is the way to go though, it'll solve all your problems with heat build up. Thats what is going into my 185 when it's fully re-built and breathing fire !

A little birdie told me that the Intercooler from an iveco van is the correct size for the ST-205. Available on e-bay for arond £30 uk pounds ! Try and find one cheaper that'll fit, bet you cant !?

Good luck,

Andy...

[popstar]

hmmm thanks andy

i know about the IVECO coolers but there rear in moscow

as for stripping out the insulation, yet i'm gonna go for it.........

what make me still smile is when i sit in a jam, the heat in the engine bay sets of warming light on the dash of thing that are disconected.......
i'm thinking of putting a big ol fan in the front on a manual override switch for the summer...............

[lagos]

are you sure your intercooler pump is working and u have coolant in the intercooler?

[popstar]

Lagos, thanks for your thoughts..

yeah the pumps working and i check fluids again this morning.....

i disconnected the senser from the intercooler and bridged it.....
but i still get the waring light coming on........

i'll get to a garage this saturday to get it checked out thou.......

[Jaws4God]

so the GT4 hoods have a water trap or no? I know you all said that a little water in the engine wont hurt... but just curious what those vents look like up close...

I am interested in getting a zyclone cf hood... just hoping to get an idea how those vents are made and work..

[Mr_E]

No water trap. Turbo/exhaust manifold under the vent. Water doesn't last long.

[popstar]

i had a water trap, that had a run off gullly to the front.......

i've striped it out for the summer but will replace it come winter.....

i don't care what you guy's say a thick layer of snow at -20 is not good condition to start a turbo working in, in my opinion !!!!

but as for rain, i don't think the water even touches the engine when it's running