Excessive Heat Coming Through Floor Vent
 

I have excessive hot air coming through the floor vent. It only happens when I have the climate control off.

It gets hot enough for my right foot to get very warm and spreads across to my other foot as well.

On long drives, it can get uncomfortable.

Any one else experience this......looking for cause and hopefully fix.

Thanks.

I could be wrong, but I believe it is normal to get pretty hot down there. Then again I have never really paid attention to it.

It is normal, try turning just the temp dial over to the 60*, helps a lot in mine.

its not the vent, its just how hot the engine/header gets. see here:

http://www.the370z.com/nissan-370z-g...-footwell.html

Thanks for the link. After reading it, this is obviously a Z thing.

Do you know what Panzir is referring to in Post #26. "I ordered ZSPEEDS aluminum version with the oil change door-great product! As an added bonus the high temp in the car is all but gone. No brainer accessory in my book."

I guess I can ask him directly. Just wanted to know if you were aware of this accessory.

ZSPEEDS aluminum version of what? I just noticed teh same thing yesterday. It was 104 out with high humidity for this part of hte world and I felt like my leg was burning. I'd get one of these things if I knew what it was. Oh yeah, and I turned it down to 60* and it worked.

(my emphasis)
Probably talking about the lower engine cover/aerodynamic plate.

This is something that seems to happen with all RWD cars I have ever been in. The whole center drive line gets warm, the metal is just conducting the heat from the engine down the drive line. Its not thing abnormal and is to be expected.

I'm confused how the ZSpeed underpanel affects the temps in question.

I guess if the temps really bothered you, some of the gold reflective foil around where the exhaust runs could help. So would putting some header wrap on the TPs/HFCs. Ditching the OEM cats should make a big difference, since cats retain a ton of heat by design.

normal when hvac is turned off. happens on other cars too.

i just keep climate control on all the time. it's not like it's robbing that much power anyway on this car.

We get lots of compaints about it on hondas as well, throw the AC on for a few minutes and blow the hot air out of the vents, will be good for awhile. the vents picking up heat from the engine bay either due to routing or its sucking in the hot air from the engine bay.

never paid it any attention on or off. guess i got use to it when i had the 350Z and chalked it up to it being a sports car, not some luxury car that has all the extra shielding and thermal barriers to keep that area nice and cool.

ZSpeed Aluminum Under Shroud
 

MDZOwner provided the link for the ZSpeed Aluminum Under Shroud.

http://www.the370z.com/body-interior...r-special.html

I just ordered the Aluminum version one today.

BTW, they only have the aluminum version in stock. The Black Powder Coat version is 3-4 weeks out.

I called Joe at ZSpeed who advised the Black Powder Coat version actually retains more heat due to the Powder Coat process. Obviously my goal was to eliminate as much heat as possible coming through the floor vents.

After installation, I will post my findings.

Did the guys at ZSpeed explain how this has any effect on temps? I'm a huge fan of the product, but I'm not sure it has any effect on the temps.

Yeah. Not much effect on temps, however he said it allows for much better air flow under the car. It dissipates the hot air more efficiently.

This is a version 2 model. It offers other benefits as follows.

1. Direct access to oil filter. No need to remove the OEM for changing oil filter.
2. Allows for deeper oil pans.
3. Allows for Oil Pan Spacers.
4. Allows additional clearance for aftermarket swaybars.
5. Also has a drain hold for coolant. Again no need to remove OEM shield to access.

It may dissipate the hot air under the panel better, since it's got a few vents. The area in question in this thread is well behind where this, or the OEM panel end.

BTW, if you have an oil cooler, the sandwich plate makes it damn near impossible to get the filter out through the trap door.

I do not have an oil cooler so this is not an issue for me.

Once I get it and get it installed, I will post if this has any effect on the hot air coming through the driver's side foot vent.

It it doesn't, the other benefits of this panel are worth the expense to me.

It's worth every penny it costs. Just don't go in thinking that there will be some kind of interior temp reduction because of it.

That sucks I ordered the black powder coated one Monday, not for heat reasons though. The Nismo model's $900 undershrowd ejector feature kicked in last week on the highway and I wasn't able to retrieve it like the last time.

What is this? I do not have an Nissmo, but I am curious.

Also, ZSpeed has a special shroud for Nissmo. It costs considerably more than model for regular Z's.

Is this the one you purchased? I think it only comes in Powder Coat.

:icon18::rofl2: happened to me too

he's joking. we nismo's have a square piece of plastic, maybe 2 feet long that nissan charges an arm and a leg for

Ah......thanks.

If you go to ZSpeed website, there is a black powder coat shroud specifically for the Nismo. It is 2 1/2 times the cost of the one for non Nismo.

bit off topic but how do you empty your cooler when doing oil changes?

I don't.

doesnt that cause you to have a quart of dirty oil in the pan with every change?

Yeah, and it gets diluted into the new oil. Blackstone Labs told me not to worry about it.

If you are doing your oil changes on schedule the oil shouldn't be dirty (if it is, you have bigger problems to worry about). You will have some "old" oil left in the cooler but it shouldn't be enough to matter or negate the benefit of a cooler. It's a good idea to do a complete change every now and then, especially if you push the engine hard, but, with modern lubricants, not a big deal.

Hell it burns off a qt between oil changes anyway... Just pretend it's the dirty qt.

ZSpeed Aluminum Under Shroud
 

Well I installed the Zspeed aluminum under shroud today. This thing is beautiful. It is made of high quality. Too bad it's underneath the car....

It is as advertised. Has access panel for Oil Filter and drain. As mentioned above, it is made of high quality aluminum. It will protect the under side of car and is so well built, I can't imagine anything penetrating it.

Did not take care of the excessive heat coming from the floor vent. After installing, I learned it is not intended to do so.

I simply have my climate control on, with A/C on or off, depending on how humid it is and make sure the air flow is up top. This eliminates the hot air coming through the floor vents.

You can buy stick on reflective insulation on under side of the floor facing exhaust system. That's what I have done with my race car. Think about what it's like for me as I have no carpet to insulate floors or driveline tunnel. Good reflective insulation takes care of a lot of that heat. You could also shield ventilation system.

You could also go to your local Home Depot and buy a few aluminum ducts and cut holes in your stock cover and rivet the ducts in place to get some air flow.

No need to spend money on that aluminum pan for ventilation.