Why did you remove the chimney?

ciper · Post by **ciper** » Fri Mar 05, 2004 4:00 am

I see no benefit to removing it.

One surprising thing is that aftermarket units exist for the WRX! So the guys who have one take it off, and the guys who dont add it

http://forums.nasioc.com/forums/showthr ... did=504564

vrg3 · Post by **vrg3** » Fri Mar 05, 2004 4:06 am

That's weird... I wouldn't think the chimney would help much without a hood scoop designed to direct air into it. The stock WRX heat shield seems like it would be sufficient.

NuwanD · Post by **NuwanD** » Fri Mar 05, 2004 4:46 am

the problem with not having the chimeny on the wrx is that when you park the car the hot air off the turbo rises and escapes through the hood scoop. It must travel through the intercooler to get to the hoodscoop which ends up heat soaking the TMIC. Our chimneys are great but we never got the i/c to go with it. Some of the early wrx motors had both however.

My stock chimney doesn't fit in since i put in the TMIC, but i'll weld up a new one once i pick up a welder.

rsstiboy · Post by **rsstiboy** » Fri Mar 05, 2004 11:47 pm

also the extra temperature the turbo created in the engine bay is no good for your electricals and rubber hoses etc...... over time you'll get problems, if you don't have the chimney put a wrap on your exhaust housing on your turbo

boostjunkie · Post by **boostjunkie** » Sat Mar 06, 2004 12:00 am

rsstiboy wrote:also the extra temperature the turbo created in the engine bay is no good for your electricals and rubber hoses etc...... over time you'll get problems

I'll agree with this statement!! I guess it's because of the chimney . . . although I don't know whether it was taken off by the second owner, somewhere around 160,000miles.

vrg3 · Post by **vrg3** » Sat Mar 06, 2004 12:20 am

But, boostjunkie, if I remember right you do still have the heat shield around your turbo...

morgie · Post by **morgie** » Sat Mar 06, 2004 12:31 am

i realised that, the main wire harness comes pretty close to the turbo.. if you remove the turbo and dont pay attention to that, and dont secure it like i did, you may end up with melted wires

why i removed it ? donno... was to lasy to put it back on, give me more place to play with the engine

Matt Monson · Post by **Matt Monson** » Sat Mar 13, 2004 2:44 am

I removed mine because when I had the PDM divorced wastegate DP on there, it wouldn't fit over it.

When I sold the car and returned it to stock, I was too lazy to put it back on. If anyone needs one, I have it in my garage...

aspect · Post by **aspect** » Mon Apr 12, 2004 10:11 am

I just put pliable silver heatshielding stuff over the cables and whatnot surrounding the turbo. I also removed the chimney to install a better dp...

MY92 · Post by **MY92** » Mon Apr 12, 2004 8:44 pm

I've fitted the late model wrx heat shield to my car as the chimney did naff all even with the hood scoop and deflector to direct air to it.

In summer I take the deflector off the bonnet completely, but in winter I've just put it back on as loads of water gets through.

Then again the Legacy bonnet scoop really does do naff all doesn't it.

rsstiboy · Post by **rsstiboy** » Tue Apr 13, 2004 1:13 pm

MY92 wrote:I've fitted the late model wrx heat shield to my car as the chimney did naff all even with the hood scoop and deflector to direct air to it.

In summer I take the deflector off the bonnet completely, but in winter I've just put it back on as loads of water gets through.

Then again the Legacy bonnet scoop really does do naff all doesn't it.

yes john, it does sfa (sweet f#$k all) great for top mounted interheaters

mTk · Post by **mTk** » Tue Apr 13, 2004 2:31 pm

For THAWA:

Yes i removed the chimney, I don't have a turbo hood, that was part of the reason.

So far i haven't noticed any problems w/ underhood heat.

MK

THAWA · Post by **THAWA** » Tue Apr 13, 2004 3:25 pm

hehe, thanks that's just what I wanted to hear

Kelly · Post by **Kelly** » Wed Apr 21, 2004 7:05 am

I pulled off my chimney, breifly, to do some exhaust work. It got thrown in the metal pile at Rallitek, which grows daily, and got burried.

I really need to dig through there and find it.

omahasubaru · Post by **omahasubaru** » Wed Apr 21, 2004 2:05 pm

NuwanD wrote:the problem with not having the chimeny on the wrx is that when you park the car the hot air off the turbo rises and escapes through the hood scoop. It must travel through the intercooler to get to the hoodscoop which ends up heat soaking the TMIC.

This isn't entirely true. The WRX does have a cross hatch like opening in our scoop shroud right over the turbo for both letting air in and air out. The chimney would help force more air in and the hot air out... but I don't see hot turbo air actually going through the I/C to get out... that would mean the hot air would somehow have to go under the I/C and then back up through it. Sure some may go that route, but not much. The hot turbo expelled air will go against that side of I/C causing it to get rather warm however. It would be much much worse if there were no heat sheild at all on the turbo.
The air is more likely to take the path of less resistance and with the scoop shroud almost sealed on the I/C, it isn't likely to choose that route.

An I/C sprayer can help remidy this problem in short order. I like that chimney stack! Maybe once this autocross season is over, I may pick one up and do some temp comparisions on my friends WRX which I put together a nice (and over built actually) I/C sprayer set-up.

I agree with you guys about not removing it!

Matt Monson · Post by **Matt Monson** » Wed Apr 21, 2004 3:56 pm

I got a chance to see one of these monkey units on a car last weekend at Flat4's car show. It is very nicely done and when properly finished on the hood side creates a seal totally divorcing the turbo's air from the intercooler making the debate above a totally mute point...

Legacytuner · Post by **Legacytuner** » Fri Jun 11, 2004 1:20 am

I have a spair if any one wants it
i also have the underside of the scoop that mates with the chimney

pm me if interested

free5ty1e · Post by **free5ty1e** » Fri Jun 11, 2004 5:01 pm

wait... so are we talking about, when adding a TMIC, cutting the chimney short and leave it under the intercooler itself? I can see how that would heat up the IC when the car is not moving. Or are we talking about somehow having the hood scoop feed both the IC fins as well as the full chimney in its stock location? Is there enough hood scoop area to accomplish this with a Saab 900 unit?

Whos got pictures?

THAWA · Post by **THAWA** » Fri Jun 11, 2004 5:06 pm

well since hot air rises, and a turbo is hot. If it was sitting under the chimeny which was under the intercooler it would heat it up. The chimny is two part, it flows cool air over the turbo when moving, and vents hot air when stationary

free5ty1e · Post by **free5ty1e** » Fri Jun 11, 2004 9:20 pm

......right. Thats why I asked if you guys were talking about cutting the chimney short and putting it under the IC because that would heat it up when the car is sitting. If not, then there must be some way to direct the hood scoop over both the chimney and the IC separately, so that when the car is sitting still the turbo heat vents out the hood scoop without going through the intercooler. I must have not asked that question right or something...?

evolutionmovement · Post by **evolutionmovement** » Fri Jun 11, 2004 10:36 pm

Maybe it coulf be fabbed to dump between te hood and windshield. Some of the weatherstripping would have to be removed. It would also probably cool even better at speed. However I don't know what long term localized heat would do to the windshield. I don't know how hot it would actually be.

Steve

free5ty1e · Post by **free5ty1e** » Fri Jun 11, 2004 10:45 pm

hmm... thats an idea. Cowl induction uses that sort of airflow setup. That would allow the IC to use the scoop, while the turbo would still get cooled from the air currents around the windshield. I agree though I wonder if that kind of heat would do something to the windshield or its seals - they werent meant to see turbo temperatures...

How about altering an STI scoop/bonnet to direct most of its flow over the IC and then a small seperate portion of its flow to the chimney? A divider in the scoop and an additional opening might accomplish this. Of course I havent gotten that far yet, just throwing ideas out there.

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Why did you remove the chimney?

Why did you remove the chimney?

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