Mercedes w126 300sdl aeromods 2.0

[kach22i]

Originally Posted by razordave

Some "progress"
https://ibb.co/3Mw5N1r
https://ibb.co/54wNkwR

Man that's outrageous, just don't pull up in it at a job interview.

I had failure of the lower front valance on my S-10 when I forgot it wasn't in 4WD and the sun came out. I went into a turn too fast and spun into a snow/ice bank. I repaired it the best I could, sort of looked like a golf ball hit me, and wasn't that bad.

Yep, your chin spoiler is only as strong as what it's attached to.

Maybe using expanding foam in cavity areas would help, and also distributing the stress more evenly with runner strips of metal at the attachment points.

I re-posted your pictures here:

http://forums.pelicanparts.com/off-t...l#post10279374

[freebeard]

Yep, your chin spoiler is only as strong as what it's attached to.

They told me they had to take the airdam/splitter off to get it onto their trailer... and it took 45 minutes each time with all those bolts.

[ennored]

Mine is held on with Velcro, at the top edge and on a horizontal support that's about in the middle that sticks forward from the original lower edge of the bumper.

Good at 100 MPH. Forward. Not good backwards in the grass. But it went right back on.

Takes about 30 seconds to peel it off to put the car in the trailer.

[razordave]

I put roughly a thousand miles on the car this weekend. Odometer is unfortunately still inoperable so no numbers for you guys, but I did bring the engine's new home back with me.

I'm in the process of prepping a 1999 slk230 for the turbo diesel engine. The newer car is smaller, lighter and maybe even job interview-able

I lost the 30 inch light truck tires for the return trip. I opted for the factory 205/65r15 in the rear and found that everything is better. Acceleration, braking, fuel efficiency, even the transmission seems to "just work better."

In other news, I am working on acquiring a much less molested 86 300sdl with a spare engine and transmission. If I can work that out, I will continue this thread a little more tastefully; if not, the car will dissipate back into the earth without it's only valuable part.

I'll probably make another ga to fl run or two with this car. I think better smaller tires, some air dam reinforcement, driver side fairings completion and maybe a partial kammback are in the works.

[kach22i]

Thanks for the update.

Wheel/Tire combinations along with air pressure are amazingly influential.

[razordave]

I was thinking we were going to get snow, so I pulled all of my ground effects off. My friend rode behind me and said he could see daylight under the car like the bottom of my conveyor belt air dam is flexing up and under the front of the car, so that will need addressed before re-installation. I'm considering a full width splitter that protrudes 1 to 2 inches forward with the trailing edge curving up to the beginning of a belly pan.

My spare tire well in the trunk hangs 3-5 inches below my hitch. I'm seriously considering pie cutting the sides of said compartment and raising it at least even with the hitch and constructing a full width diffuser.

I also removed my decklid extension, inverted it and repurposed it as a kamm back basically covering my entire rear windscreen.
https://www.dropbox.com/s/mk0xij1470...70521.jpg?dl=0

I'm thinking next addition to the rear will be a spoiler similar to kach22i's s10 nascar mod. I'm leaning toward something like the z07 corvette rear spoiler where the center section is not as tall.

I found a hot rod article that states up to 2 inch tall spoiler has no drag penalty so I'm trying to figure out if I should make my spoiler 2 inches tall from the trunk lid or from the kamm?

My hood also looks significantly different than my last update, I have rerouted my exhaust through the sheetmetal. I toyed with a few different angles, diameter piping, etc but am somewhat satisfied with it's current configuration.

I also added a hood blister in the form of a cut down outboard boat engine cover. I'm not 100% commited to this idea but when I noticed exhaust soot trails moving in a curve from 8 inches inbound of the fender out to the mirror, I decided the shape should assist.

https://www.dropbox.com/s/nqiuqnjeok...70610.jpg?dl=0

You may notice my attempt at a gurney flap, I wanted to not trim the donor fiberglass piece as much as I did, but visibility would suffer greatly. I also didn't center the hood ornament, I wanted the exhaust to exit the top plane. I may find a wider wedge or cut this one later, I'm not yet sure. The price was right and I used the last of my duck tape, coroplast, self tappers and almost all of my t-rex tape with yesterdays toying.

[razordave]

I'm also considering some really radical ducting/venting of the radiator.

That hole I cut in the the hood just made me really want to cut the sheet metal on my old turd. I'm thinking of cutting the hood and bending the leading edge down behind the radiator vent either around or through the hood blister but I'm worried about that reducing air flow through the radiator.

I'm thinking 20-35% air flow up, 20-40% still in the engine bay and whatever else out behind the front tires via some probably time consuming, labor intensive ducting. I need to find a source for galvanized hvac type sheeting.

[kach22i]

.......decklid extension, inverted it and repurposed it as a kamm back......

It does not sound like you were able to do any A v. B testing between your Bonneville racer decklid extension and rear window Kammback.

What were your seat of the pants impressions?

In the past I've discouraged attempting a Kammback on Mercedes sedans because the wind tunnel images show they somehow worked out some good detailing in that area.

The Cd numbers are pretty good considering it is a sedan.

My two cents, I like the function and looks of the decklid extension better.

Regarding a rear spoiler, good for down-force, bad for Cd.

I would not try without first doing the front chin splitter you mentioned.

[razordave]

Edit Air dam is back on. I added some alumapanel to the center of the front bumper, it should have less than half the previous deflection.

Unfortunately, my odometer doesn't work so no hard data on anything. I presume I could work out mpg on one of my upcoming ga-fl runs but honestly it's difficult enough just to make the trip without blowing a charge pipe. I need to order a proper front mount intercooler tubing kit with silicone couplers and t-bolt clamps.

I have put maybe 30 miles on the car since I moved that lump of coroplast, but since I also removed the air dam, there's no comparison.

https://media.daimler.com/marsMediaS...cs-development

They have a few tuft tests which I don't think I'd seen before but the smoke trail, to me seems like the kamm should be worthwhile.

My main complain with the decklid extension was that it's in the way of opening the trunk. The lock is also a button on this model.

I may bring the decklid extension back, I am thinking it should be more of a positive angle to bring it closer to the aero-template.

[kach22i]

Originally Posted by razordave

Unfortunately, my odometer doesn't work so no hard data on anything..........

I have put maybe 30 miles on the car since I moved that lump of coroplast, but since I also removed the air dam, there's no comparison.

https://media.daimler.com/marsMediaS...cs-development

They have a few tuft tests which I don't think I'd seen before but the smoke trail, to me seems like the kamm should be worthwhile.......

My odometer no longer works either but seat of the pants feelings about cross winds, gas mileage, down-force and other characteristics can still be commented on with an opinion. Heck I know when I'm down 1/4 quart of oil or down 10 lbs of air in my tires by feel alone.

Not much of a point of going through these exercises in form without some observations to go along with them in my opinion.

Regarding the link, great link now compare your S-Class to it's contemporaries to gain full appreciation of what you have. Not all notch-back looking sedans are so graceful with the air upon release at the rear window area.

EDIT: Can you rig a pull wire to your trunk release?