11 votes

Porsche 918 - benefits of top mounted exhaust

I certainly don't claim to have any special inside knowledge as to why Porsche engineers decided to route the exhaust that way, but I think that we can analyze the possibilities and trade-offs from an ...
Edward's user avatar
  • 2,847
9 votes
Accepted

Why is air buffeting worse for most cars with the rear windows than the front windows?

In the simplest terms possible, the windshield acts as a spoiler or fairing, pushing the air out and up as your vehicle gains speed. The air naturally will push back to be along the side of the ...
CharlieRB's user avatar
  • 9,035
4 votes

Why are hatchbacks and SUVs' rear window vertical, relative to sedans' at around 45°?

For the angle of the rear window, vertical is basically for the load volume / carrying capacity, getting things with a high roof line opening. Well, some sedans or sedans with a hatch-back did have ...
Solar Mike's user avatar
  • 34.7k
3 votes
Accepted

Why do hybrids have the aesthetic wheel cover on the body?

The wheel covers, or fender skirts Wikipedia says they are commonly called, are fairings installed to reduce drag in the wheel wells and thus to increase range. According to the same Wikipedia article,...
dlu's user avatar
  • 14.5k
3 votes
Accepted

Can this wing damage cause a car to run/move noticeably/significantly different?

Aerodynamic resistance will be having an effect here, but its unlikely to effect stability at normal road speeds. You will get airflow disturbance around the damaged area causing drag, however as for ...
Orb's user avatar
  • 5,057
2 votes

What are these protrusions on lights?

If you check inside the lens, I suspect the bulb will be right near the area where this protrusion is at. If so, the reason for this is to redirect the light so it can be seen easier from the side. It ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
1 vote
Accepted

What are the benefits of lowering a vehicle for racing

I think the easiest way to realize your initial argument of why lower the center of gravity, can easily be shown as misguided by this one simple statement. If what you are suggesting is accurate, why ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
1 vote

ECU shielding/ Highway driving

So what do you think the under hood temperature gets to? Most ecu's are put in an airstream and also sufficiently protected. As for cats, the issue is making sure they stay sufficiently warm so the ...
Solar Mike's user avatar
  • 34.7k
1 vote

Why are hatchbacks and SUVs' rear window vertical, relative to sedans' at around 45°?

There are basically two options to reduce air resistance at the rear of the car to a minimum. One is to make the rear flat and vertical. That way, the air flowing over the car doesn't create any ...
alephzero's user avatar
  • 2,954
1 vote

Why are hatchbacks and SUVs' rear window vertical, relative to sedans' at around 45°?

The reason for the question in the title (why vertical?) is that car has a maximum possible length if you want it to be maneuverable in tight spaces. For example, my Toyota RAV4 hybrid is ...
juhist's user avatar
  • 14.6k
1 vote

Wheel covers for MPG, recommendations

The most effective wheel trims for enhanced MPG are something along the lines of full racing moon discs. These are effectively a flat disc that covers the whole wheel. This eBay listing is just one ...
Steve Matthews's user avatar
1 vote

Wheel covers for MPG, recommendations

I dont believe adding wheel covers will make a noticeable difference to fuel economy. You would get more benefit from removing weight or drag. At the extreme end of aerodynamics, dragsters and ...
Sir Swears-a-lot's user avatar

Only top scored, non community-wiki answers of a minimum length are eligible