As the title says, I did a half-hearted search on hood-vented exausts, but couldn't find any immediate threads.

My objective is to simplify the exhaust system of my single turbo setup for streetracing purposes. I got the idea of a hood-vented exhaust from the following photos (Jeff Kiesel's 7parts.com car):

http://www.importtuner.com/features/.../photo_09.html

http://www.importtuner.com/features/.../photo_21.html

As you can see from the photos, the exhaust is routed though the passenger-side over-fender to exist behind the front wheel. Although I like this solution, it is my understanding that it is not a good idea to cut through the stock monocoque (FYI, the pictured car has an independent tube frame). So, my question is if the second best solution would be to route the exhaust directly through the hood similar to a "vented hood".

The potential issues I can think of are as follows:
1. excessive heat above hood/windshield (remember that EGTs are up to 900 degrees Celsius);
2. grime/dirt on windshield;
3. melting/burning hood (hopely prevented by generous application of heat insulation plates/tape); and
4. limited space (need to relocate ABS system)

But the beneftis could be:
1. minimal backpressure for turbo;
2. less weight with simple exhaust system;
3. more underbody ground clearance.

Your views would be greatly appreciated since I am seriously thinking about going this route.

- Hoon.

 

its going to be blasting fire and oil out on your passenger window and probably brown your paint on your roof up. also your turbo is gonna eat some serious water if you get stuck in the rain. picture driving at night and everytime you shift a gear your gonna get the flash in your face. probably would be cool for like 10 minutes and id be over it. just my opinion. i think it would be tight but id rather give it a try on my explorer.

 

Dead links

 

Quick_93_FD: Point taken. I didn't think about the backfiring issue. How about carefully cutting a hole through the monocoque to route the exhaust to the side similar to the 7parts car? Is this feasible?

the_saint: The importtuner website is very slow, but the links work. Try this alternative link for the full article:
http://www.importtuner.com/features/...car/index.html

 

Why not just do an exhaust cutout/dump?

 

2 Thoughts...

Not that you seem to care, but also, you could poison yourself since the intake vents for the AC/Heat are right at the base of the windshield.... you answer of course is you wouldn't use it... but that could make for some potentially uncomfortable trips.... in fall / spring / Winter if you drive it then...

Also with unibody construction cutting large holes into the frame without support, and reinforcement could result in a very short driving experience, especially in racing where torque, and frame flexing is at its peak.

And don't get me wrong it's a great idea, I've toyed with the idea of side exhausts A-La Viper or Cobra... but i've been told by frame experts, that unless I build like you said A tube frame to drop the body work on, it's not even remotely safe... but your mileage may vary....

 

To be honest not only is minimally beneficial over a large diameter free flowing exhaust but it is also extremely illegal. if you got pulled over for any reason you can get a serious ticket or have your vehicle impounded. you also will not be able to run your car at any nhra sanctioned track or dragstrip as basic tech stipulates your exhaust must exit a minimum distance behind and away from the passenger compartment.

Obvious the heat reasons are also a major problem too if you dump it right out on your passengers side where the abs is currently you will also be liable for any heat exhaust related damage related to someone elses car who may be beside you at a. a red light, b. a parking lot, c while driving. or how bout if your parked along a street and if a pedestrian is walking past your car at the moment you start it the noise and blast of heat is enough to scare/harm someone enough to file a lawsuit against you.

I know it may look cool to just dump it out the side but it really isnt a well thought out idea. exhaust gas re-entry is another problem as someone else mentioned which would leave you falling asleep from asphyxiation while driving, slowly killing yourself. the power gains would be minute at the added price of a much louder exhaust and that would only serve as an attention getter to both people and police. do you want more police attention. especially when your car is illegally modified?

Just do it right putting it in the back or leave it alone. you could say dumping it out the side should be nothing more than a 'pipe dream' ahhaah lol