exhaust smell and wind?

[Lumpyguy]

Just curious what everyone might of my idea, I am thinking of making a lexan rear windscreen for behind the driver and passanger to help with wind and does anyone think it might help with the exhaust coming back into the car? I figured if it blocks wind it might help with the exhaust too?

61127

[flynntuna]

I've been thinking of the same solution. Whether using lextan or mesh material like Porsche would be worth a test anyway.

[UnhipPopano]

Two things. First, for the rear windscreen to work, you will need to have side windows. The hardtop looks like it is needed for the side windows to work, but then you do not have the wind problem in the first place. Secondly, why does everyone refer to clear plastic as "Lexan"? Lexan is a relatively soft Acrylic plastic, where Poly-carbonate is the clear plastic of choice for something like this, as it is stronger and does not scratch as easily.

That said, is it possible to add a vent similar to what some of the roadsters have? This should increase the cabin pressure and keep the exhaust gasses from being sucked in.

[phil1734]

Lexan is a polycarb...

[Lumpyguy]

just using the word "Lexan" as a reference to some form of clear material that's not glass. obviously if I make a template I will buy the right type of material to make the proper part. It will be easy to make something quick out of just cardboard to try it, with ande without it to see how it does for wind and smell. I am not expecting alot but its a cheap experiment.

[ben1272]

It sounds condescending when you say "why does everyone...." followed by some factoid. Instead try saying something like "you could use Lexan, but you might want to consider <insert material here> since it is stronger and more scratch resistant."

Also, the gentleman (Phil1734) is correct.... https://en.wikipedia.org/wiki/Polycarbonate Lexan IS polycarb. Acrylic is called Lucite apparently. It is good to know to consider both types of clear material when considering an application though!

[flynntuna]

Two things. First, for the rear windscreen to work, you will need to have side windows. The hardtop looks like it is needed for the side windows to work, but then you do not have the wind problem in the first place. Secondly, why does everyone refer to clear plastic as "Lexan"? Lexan is a relatively soft Acrylic plastic, where Poly-carbonate is the clear plastic of choice for something like this, as it is stronger and does not scratch as easily.

That said, is it possible to add a vent similar to what some of the roadsters have? This should increase the cabin pressure and keep the exhaust gasses from being sucked in.

In this video, it seems to work without side windows.

https://www.youtube.com/watch?v=jyREjU2cWb4

[turbomacncheese]

In this video, it seems to work without side windows.

https://www.youtube.com/watch?v=jyREjU2cWb4

I watched it twice. Second time I saw the side windows going up and down. Very sneaky.

[billjr212]

Definitely works without side windows. Wife had something similar on her Eos and it made a big difference in the cabin on the highway. I also rigged up something similar for a long road trip in my old Roadster. It made a difference, but not as much. I chalk that up to the upright windshield and general turbulence. Should be fairly effective in the 818. I was actually considering this exact topic earlier this week and plan to do the same this winter.

[Lumpyguy]

The video does show them using the side windows somewhat. If someone with a roadster wants to cut some heavey cardboard and secure it with tape or zip ties and maybe try it with and without and see ifd they notice a difference before spending money on mesh or some plastic type material.

[Frank818]

61127

I know you welded arc-sort of like roll bars but I didn't know you made them look so great! lolll

Subscribing to the thread.

[Canadian818]

That said, is it possible to add a vent similar to what some of the roadsters have? This should increase the cabin pressure and keep the exhaust gasses from being sucked in.

I was actually considering running some ducting from the front bumper to the cabin via some dash vents for a poor man's A/C, but it could actually help with aerodynamics if it raises the pressure in the cabin even a little.

Not sure I've seen many street spoilers on finished cars, does anyone have exhaust smell issues with one? I can't help but think that a diffuser and wing would make it difficult for the air to travel backwards. Of course sealing the engine bay from the cabin is a given and should be done first.

[Aero STI]

I was actually considering running some ducting from the front bumper to the cabin via some dash vents for a poor man's A/C, but it could actually help with aerodynamics if it raises the pressure in the cabin even a little.

Not sure I've seen many street spoilers on finished cars, does anyone have exhaust smell issues with one? I can't help but think that a diffuser and wing would make it difficult for the air to travel backwards. Of course sealing the engine bay from the cabin is a given and should be done first.

I have both the diffuser and street spoiler. Pretty regular exhaust smell. Thankfully I run e85 and I like the smell.

[Frank818]

I have both the diffuser and street spoiler. Pretty regular exhaust smell.

Damn it. :(