Ok i got one for $100 delivered. i havent got pics of the rear of my flared guards so i could not photoshop my car but it is the right price lack of pics make it a gamble the fiero rear track is about 7 inches wider so few mods will need to be made. http://www.wedriveexcitement.com/
[This message has been edited by Australian (edited 02-18-2010).]
I feel the same way man. I'm in too deep with my car to turn back. Now I MUST have a diffuser too. I really want one. I have a yellow fast back. Can anyone photoshop a pic of the blue car above in yellow?
not sure why it looks so green. just a quick photoshop, hope its good enough
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02:09 AM
Australian Member
Posts: 4701 From: Sydney Australia Registered: Sep 2004
I like this one the best... When I was looking at the ones at the top of the post, I was thinking it covered too much of the rear bumper and overpowered the look of the rear. Not to mention if you got bumped from behind, it would get damaged very easy...
The above pic looks the nicest and it retains more of the "bumper" and is not as overpowering. However, I think it would look best if more of the "bumper" was retained... Maybe use the bottom half of the facia from end to end (around the exhaust tips as well)...
Just my .02
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11:44 AM
Mar 6th, 2010
ALLTRBO Member
Posts: 2023 From: College Park, MD Registered: Mar 2006
A proper rear diffuser should increase the efficiency of the evacuation of air from underneath the vehicle. They are supposed to be coupled with underbody trays and front splitters to work properly and gain the maximum benefit. Together, they will increase downforce. Thats my understanding of it.
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01:16 PM
ALLTRBO Member
Posts: 2023 From: College Park, MD Registered: Mar 2006
It's harder and less efficient to do on a Fiero with our mid-engine layout that requires airflow to travel into the engine bay from underneath and out of the vents (which has its own advantages), but very positive results can still be had when done correctly. I'm researching on how to do that correctly. The Fiero bottom side is already relatively flat, so will be an easy upgrade to add easily removable flat sheets everywhere possible under there to clean up the airflow. I'd like to take several pressure sensors and airspeed sensors and place them under the car to datalog where and how much pressure and flow changes in different areas with different mods. Of course the faster you go, the more this comes into play. Reasons like this are part of why I'm selling off my stock of toys (the fast cars, not the fast ZX-10R. ) and buying a 2010 V6 Camaro to DD (that I'll just have to turbo. DOH!). I'm tying to go 'all out street' with this turbo Fiero, it will be my only 4-wheeled toy. Semi-engineered, not cobbled together. Wish me luck, heh.
Yes, it's unfortunate that it's the current fad amongst car manufacturers (and ricers). Just like most of the scoops that are slapped on all over cars by the factories (and ricers), these "diffusers" are usually only for looks. The Camaro 'diffuser' should be mildly effective though, if the stock mufflers are retained as shown above. It won't do much to eliminate the turbulence in the flow, but it looks like it would provide the means for the higher velocity (though 'dirty') flow underneath to slow back to ambient pressure somewhat properly. It would be even better if the fake vent directly above the 'diffuser' were opened up into a real vent (very easy to do, I'd think).
[This message has been edited by ALLTRBO (edited 03-08-2010).]
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07:54 PM
nitroheadz28 Member
Posts: 4774 From: Brooklyn, NY Registered: Mar 2010
IMO, the stock Fiero trunk and functional rear diffusers are mutually exclusive. The trunk hangs down too low. It's at the same level as the bottom of the rear fascia. This leaves no room for a diffuser section. If you're afraid to cut the trunk, you'll have to settle with something like that Camaro one.
I'd be more than happy to make diffuser fascias. I even have one. But it requires cutting out some of the trunk.
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01:35 AM
doublec4 Member
Posts: 8289 From: Oakville, Ontario, Canada Registered: Jun 2003
IMO, the stock Fiero trunk and functional rear diffusers are mutually exclusive. The trunk hangs down too low. It's at the same level as the bottom of the rear fascia. This leaves no room for a diffuser section. If you're afraid to cut the trunk, you'll have to settle with something like that Camaro one.
I'd be more than happy to make diffuser fascias. I even have one. But it requires cutting out some of the trunk.
I agree to some extent.. but when I look at height that the subframe is from the ground, and then look at the height of the bottom of the trunk, the trunk sits quite a bit higher. There is some room to work with so that a "tunnel" or channel can be upturned from the rear cradle area, to the bottom of the bumper. When I was messing around with cardboard, I was able to get a nice curve that followed that path.
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02:08 AM
ALLTRBO Member
Posts: 2023 From: College Park, MD Registered: Mar 2006
The bottom of my trunk is now cut. I'll also weld up a tubular rear bumper in place of the stocker if I need to. The sport/race exhaust is going under there, but as high and as far forward as possible to make room for a reasonably functional diffuser. The top of the diffuser will be vented to help extract the exhaust heat. The diffuser will likely also extend slighty rearward of the fascia (maybe an inch or so), helping to get a more gradual slope. I think I can make that look good.
I have a spare rear fascia, it'll be getting hacked up so I can make the diffuser, then the nicer rear fascia will be properly cut to accept it. This will all take a while, but I'll accept no less.
Alltrbo be sure post pics when done. My diffuser is on back burner a while i just painted whole car so will leave it 12 months for now i do have the diffuser itself but going to enjoy my car a while before i make further changes.
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07:22 AM
Aug 22nd, 2010
doublec4 Member
Posts: 8289 From: Oakville, Ontario, Canada Registered: Jun 2003
Hey Chris, that looks pretty good. I'm looking forward to some "at a distance" shots.
That said, the rear mounting setup is making me cringe. That doesn't look very sturdy. If the diffuser makes enough downforce, it could cause problems.
I'm not trying to poo-poo your idea, though. That's a great proof of concept, which IMO could be made even better with a little tweaking.
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11:16 PM
doublec4 Member
Posts: 8289 From: Oakville, Ontario, Canada Registered: Jun 2003
Hey Chris, that looks pretty good. I'm looking forward to some "at a distance" shots.
That said, the rear mounting setup is making me cringe. That doesn't look very sturdy. If the diffuser makes enough downforce, it could cause problems.
I'm not trying to poo-poo your idea, though. That's a great proof of concept, which IMO could be made even better with a little tweaking.
Thanks
Its not too bad in terms of sturdyness, I was pulling on it pretty hard and it didn't budge, however I'm very open to suggestions. Throw some ideas at me!
Originally posted by Blacktree: Hey Chris, that looks pretty good. I'm looking forward to some "at a distance" shots.
That said, the rear mounting setup is making me cringe. That doesn't look very sturdy. If the diffuser makes enough downforce, it could cause problems.
I'm not trying to poo-poo your idea, though. That's a great proof of concept, which IMO could be made even better with a little tweaking.
That 'diffuser' isn't going to change the aerodynamics of the car enough to make any useful difference one way or the other. Notice the smooth up-turned lip at the upper edge of the exit? It will actually help air to stick to the body longer. It might even cause a slight decrease in fuel economy too. It looks nice, but that's about all this particular one is designed for.
That 'diffuser' isn't going to change the aerodynamics of the car enough to make any useful difference one way or the other. Notice the smooth up-turned lip at the upper edge of the exit? It will actually help air to stick to the body longer. It might even cause a slight decrease in fuel economy too. It looks nice, but that's about all this particular one is designed for.
I think he's going for looks almost exclusively, at least that's what I gathered. A diffuser is only one part of a system, afterall. I don't think it'll hurt anything though, I seriously doubt that it'll add drag over the stock bumper, providing that air isn't getting trapped above it (creating the 'parachute effect'). It should clean up some turbulence a bit.
Of course I'm only going by a few pictures so I suppose YMMV.
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07:32 AM
ALLTRBO Member
Posts: 2023 From: College Park, MD Registered: Mar 2006
Originally posted by doublec4: Its not too bad in terms of sturdyness, I was pulling on it pretty hard and it didn't budge, however I'm very open to suggestions. Throw some ideas at me!
I tend to be a little paranoid about stuff that can fall off the car. Your mounting setup may turn out just fine. As of right now, my only suggestion would be to drive it around and see how it holds up. It's a great excuse to hop in the Fiero and give it some exercise.
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09:13 AM
doublec4 Member
Posts: 8289 From: Oakville, Ontario, Canada Registered: Jun 2003
I've yet to take it out on the highway though. I did take a few more pictures... again, excuse the filthy car! It's supposed to rain again so I didn't wash it.
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06:32 PM
Blacktree Member
Posts: 20770 From: Central Florida Registered: Dec 2001
That looks great with the wraparound spoiler and the raked stance! You might want to watch the exhaust heat now that it's more boxed in, just something to think about.
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11:36 PM
Aug 25th, 2010
doublec4 Member
Posts: 8289 From: Oakville, Ontario, Canada Registered: Jun 2003
That looks great with the wraparound spoiler and the raked stance! You might want to watch the exhaust heat now that it's more boxed in, just something to think about.
Check out my build thread and I think I posted a pic of the heat shield I whipped up for it. I will keep a close eye on it though.. from what I understand, carbon fiber is fairly heat resistent.
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12:14 AM
Blacktree Member
Posts: 20770 From: Central Florida Registered: Dec 2001
Yeah, the carbon will handle heat really well. The only concern would be the resin. But if it's not in direct contact with the hot muffler, then it shouldn't be a concern.
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12:19 AM
ALLTRBO Member
Posts: 2023 From: College Park, MD Registered: Mar 2006
Ahh, right, the build thread. I wasn't referring to overheating the diffuser itself, but everything else, heh. There is less airflow to move the exhaust heat out behind the car, so it'll go into other things, like the trunk and the engine bay in general. I guess it may not be an issue at all though, there is still a good bit of exposure, and it's not like you'll be running 30psi around a track like I plan to with the built 3.2 shortblock. That exhaust is going to glow! I'll need very good exhaust venting above the diffuser.
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12:42 AM
doublec4 Member
Posts: 8289 From: Oakville, Ontario, Canada Registered: Jun 2003
Ahh, right, the build thread. I wasn't referring to overheating the diffuser itself, but everything else, heh. There is less airflow to move the exhaust heat out behind the car, so it'll go into other things, like the trunk and the engine bay in general. I guess it may not be an issue at all though, there is still a good bit of exposure, and it's not like you'll be running 30psi around a track like I plan to with the built 3.2 shortblock. That exhaust is going to glow! I'll need very good exhaust venting above the diffuser.
Cut the trunk out and vent it out from the top of the decklid, or maybe do something ferrari-ish and vent it out of the back of the bumper or between the tail lights with some mesh
70$ + delivery
) and buying a 2010 V6 Camaro to DD (that I'll just have to turbo. DOH!). I'm tying to go 'all out street' with this turbo Fiero, it will be my only 4-wheeled toy. Semi-engineered, not cobbled together. Wish me luck, heh.
