Rear Boot Very hot - 986 Forum - The Community for Porsche Boxster & Cayman Owners

shlim8 · 03-17-2011, 05:15 AM

Sorry if this is a double post... seem to lost my prev post.

I find that the rear boot (trunk) on my boxster is very hot... luckily I've not put groceries in there or it'll prob be cooked.

I checked under the trunk carpet lining and found that the insultation on the floor of the trunk only covers only part of it, maybe 30% ? And the uninsultated portion is so hot that it almost burnt my fingers...

Question - am I missing some insultation in the floor of the trunk ? And what can I use to insultate the rest of the flooring... ? It's so hot that I'm concerned what insultation to use...

chris97boxster · 03-17-2011, 09:25 AM

Speaking only for my 97 boxster
underneath my carpet in the the rear trunk
I have a plywood 2 pieces (factory)
this rests on the metal and the carpet sits on a flat surface
It does get warm in there..enough to make a chocolate bar soft
But the carpet is not resting on the metal right above exhaust
which could lead to burnt carpet smell

My 2 cents
Chris

Stroked & Blown · 03-17-2011, 10:30 AM

IIRC, some have noticed lower trunk temps after changing exhausts.

mikefocke · 03-17-2011, 11:03 AM

Over the muffler and the front is behind the radiators.

Are your scoops under the engine on the under-body plastic there?

I regularly bring groceries home 15 miles in an already warmed up car which should have the trunk at max temp.

shlim8 · 03-17-2011, 04:40 PM

I've got a metal heatshield on the floor of the rear trunk but that only covers a portion of the left side (driver's side for US, passenger side for me), prob covers the area above one cat (euro specs - no cat on the headers). Which seems strange since I've got cat on both sides of the car ! No plywood pieces at all.

Anyone else got any insight on what's supposed to be there ? This is a 2001 box 2.7l.

The carpeting seems to be a reasonable insulator though as it's only warm to the touch. But the trunk still is very hot, especially after going through start-stop traffic. It's ok on highway runs (makes sense...).

It's not a major problem, but it would be nice to get the temp down.

Ha ha, it makes a good excuse to get a sporty exhaust system... eer, I need that so I can carry groceries in the trunk !!

shlim8 · 03-17-2011, 07:37 PM

Mystery solved.... one of my mechanics never put the 2nd part of the heatshield back in the car.... Found it and it's back in the car.

BTW, it's not a metal heatshield but a styrofoam one... the metal heatshields are on the underside, facing the cat/transmission and engine.

Stroked & Blown · 03-18-2011, 05:09 AM

Does anyone know if there were changes in the trunk insulation across the model years?

Topless · 03-18-2011, 03:38 PM

Quote:

Originally Posted by Stroked & Blown

Does anyone know if there were changes in the trunk insulation across the model years?

Yes, later years starting in 03 I believe the heat shielding/insulation got a lot better. The first gen cars are highly prized as pizza delivery vehicles in colder climates

WhipE350 · 03-18-2011, 03:51 PM

Quote:

Originally Posted by Topless

Yes, later years starting in 03 I believe the heat shielding/insulation got a lot better. The first gen cars are highly prized as pizza delivery vehicles in colder climates

2000 'S'...yes I've learned to put food in front trunk...also doesn't roll around as much.

shlim8 · 03-27-2011, 06:31 PM

I just put in another layer of insultation (which I had lying around for the bonnet lid) on the floor of the trunk.

Helps alittle - at least the floor is not so hot. But it is still toasty in there.

PhilNotHill · 03-27-2011, 06:46 PM

Try driving faster. Maybe that will keep your food cooler. And if you go directly home you will get your food in the fridge sooner.

JTP · 03-28-2011, 05:24 AM

My in-laws had a '99 and the trunk used to get very hot as you describe but in my '00S it barely gets warm even after a 7 hour drive.

thstone · 03-28-2011, 07:43 AM

I've considered installing a rotisserie in the rear trunk of my '99 to roast chicken.

BYprodriver · 03-28-2011, 08:08 AM

Quote:

Originally Posted by Topless

Yes, later years starting in 03 I believe the heat shielding/insulation got a lot better. The first gen cars are highly prized as pizza delivery vehicles in colder climates

2003 rear bumper cover was redesigned to increase airflow over muffler for better cooling.

shlim8 · 03-28-2011, 11:38 PM

Quote:

Originally Posted by thstone

I've considered installing a rotisserie in the rear trunk of my '99 to roast chicken.

Yes, you probably could cook a chicken on the bare metal of the trunk... it pretty much burnt my hand when I touched it....

As philnothill said..."drive faster".... as long as the car is moving at a reasonable speed eg on highway BUT not pushing it... the trunk is reasonable. Traffic jams or after a spirited drive... the cats/exhaust are pretty much cooking the trunk.