For those of you who may be thinking of making long trips with fragile things in the trunk, be aware that the trunk warms up really quickly during high speed (>60mph) driving. We all know that the 4g63 runs very hot. A lot of that exhaust heat rises into the trunk compartment during driving. Since the trunk has zero airflow, it stays there.

Since my RS has no padding in the trunk (except for a floor carpet) luggage sits against hot, bare metal. It's hot enough to damage electronics that sit directly above the muffler. Conceivably, it could melt plastic. Beware.

d

 

didnt STi's have the same problem? except worse? maybe heat wrapping the whole exhaust may help..

 

are you basing this just on your RS or is this for all Evo8s?

 

I live in Hawaii, always hot here and drive on the Freeway sometimes one hour. When I open the trunk I don't feel warm air coming from inside

 

I have the same problem and I did not drive more than 30 minutes.

My trunk at the bottom was very hot at the touch.
I am installing a big system in it and I noticed that the dynamat is almost burned!!!
I changed the exhaust I have the HKS hi power do you think that this could be the problem?

 

I've experienced this in my 03 as well. Never checked it after interstate driving but when I was putting the spare tire back in after a track day my hand touched the trunk right above the exhaust and realized how hot the trunk was. I had to wait for a few minutes with the trunk open to let that area to cool down before I put the stuff back in. It never happened in my old car before so I was really surprised too.

I think this issue needs to be addressed as it was hot enough for the rubber to melt if exposed for long period of time.

btw my car is stock. Also reminded me of the WRC where Solberg's STI had the same issue. As there was no heat shield, the hot exhaust caused the spare tire to burn.

 

Did anybody try to fix it?

 

OT, but why do you hate porsche?

 

yeah, dont keep the bottle in there or <BOOM>

 

It's a joke, as you can see I had 2 of them, they are great cars but overpriced and if you want to tune them be ready to spend a fortune.

BTW the EVO people are much more fun and friendly , the Porsche guys...

 

it's from your exhaust pipe right on the right side of the trunk.

I've noticed that too. You can't do anything about it, unless you get some heat shield above the exhaust piping. Or put some rubber spray stuff down, like in truck bed liner.

 

Something must be wrong with your EVOs, I drive around here in South Florida and its frigin hot outside, but my trunk isn't. BTW I do DJ work on the side and I transport my electronic equipment all the time and never was it hot to the touch.

 

to be completely honest, my car is pretty new and I haven't crawled under there to look... but aren't there segmented aluminum "clamshell" heat shields above the stock exhaust?

these are generally standard items to protect the floorpan from exhaust heat.

 

I did some looking and there are no heatshields anywhere above or under the exhaust. that answers the question as to why it gets hot.

but how hot? well, I found that out too. my buddy had a small temperature probe about the size and shape of a carpenter's pencil. I have no idea where he got it, maybe Harbor Freight Tools, but it has a clock, temperature at the device, and temperature at a probe attached to a 12' cord.

I stuck this probe with box tape to the floor of my trunk, under the mat on the sheetmetal of course, to the right of the spare tire well and aft of the shock tower. basically, right above the exhaust can.

so far I've seen upwards of 120F while cruising around. Wichita was 92F today and my Evo is white. about 10-15 minutes after parking the temperature seems to peak around 130-135. I'm not sure if the device registers higher or not, but my hand says it's damn hot but not absurdly so. it's uncomfortable but I sure didn't get burned in short contact.

that type of temperature isn't going to hurt electronics at all-- not nearly high enough.

hope this is helpful or at least interesting.

 

dayam!....i accidentally left my dog in the trunk for 3 hours running hard!