Rallycross is awesome. But the fine dust in my area SUCKS big time. I have no back interior, and the dust cometh over 15mph. Any tips? I don't even know where to start looking for holes. Everything underneath the car has no holes. Maybe around the taillights? I don't get any water leaks in the hatch, so I doubt it's getting past the hatch seal. No holes in the flooring. What would I even seal a hole with? Weld over? Jb weld?
Seems like a roof scoop can help with cabin pressure. But given the "1985" look of my Celica, and pristine condition it's in, I don't really want to cut up my roof.
Silicone or great stuff expanding foam depending on hole size. And some of that single sided adhesive thick foam tape stuff you find in home depot
Are your cabin air filters intact?
Cabin air filters? This car is ancient man. It doesn't have one.
Check the doors and rear quarters for vents. I've seen them located in the doors so they are outside of the weather stripping and hidden from view, or other times in the trunk hiding in corners behind trim.
Typically there are vents to allow air to exit when you have the HVAC pushing air into the cabin. The vent should have rubber flaps to prevent back flow, but they age. They also tend to be located in areas where they could see lower pressure creating a differential that can draw air (and dust) into the cabin.
Once you find the vents you may want to try covering them with tape for the next rally cross. That will prevent the vents from contributing to a pressure differential in the cabin.
Put the interior back in?
I'm not sure if this is you specific model, but the image shows the vents I was referring to:
Shut off the lights in your garage or, if outside, wait until it's dark. Put a bright work light under the car. Apply aluminum tape anywhere you see light.
For what it's worth when rallycrossed my '85 Celica GTS didn't let any dust in despite having rust holes in the rockers, but it had the full interior.
A lot of cars also had vents behind the bumpers to equalize air pressure in the cabin when doors and hatches are closed
Roll windows up and run positive pressure inside the car.
Light a tire on fire inside the passenger compartment and see where the smoke comes out.
In reply to gearheadmb:
The smoke will rise and the holes are probably in the floor, so it would be advisable to roll the car first.
Ten posts and we're suggesting turning the car upside down and setting it on fire.
I like Nohome's idea. Does it still have a HVAC fan? Just turn it on high and see if it helps.
Some Datsun guys have solved their exhaust fume problems by using a shop vac to create negative pressure in the cabin (hose rolled up in a window and taped off) and then using a smoke machine from Ebay outside of the car. It was pretty obvious to see where air enters the car with this technique.
It has a blower fan motor. But without ac the cabin is hotter than hell. The vent picture above mentioned is close. It's the same generation, but mine is a hatch. Vent number one is faux. Vent two is inside the doors. I'll look into that one. All else fails, I'll reinstall the interior.
¯\_(ツ)_/¯ wrote: In reply to gearheadmb: The smoke will rise and the holes are probably in the floor, so it would be advisable to roll the car first.
This is why I like you guys. Always thinking two steps ahead!
jimbob_racing wrote: Some Datsun guys have solved their exhaust fume problems by using a shop vac to create negative pressure in the cabin (hose rolled up in a window and taped off) and then using a smoke machine from Ebay outside of the car. It was pretty obvious to see where air enters the car with this technique.
could also just run fog inside the car and see where it leaks out.
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