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Old 05-26-2008, 10:54 AM   #11 (permalink)
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I have an idea for a rear spoiler, thankfully AMG made them for these cars in the 80's



what do you think?


also, how do I do a coast down test and what will it tell me.

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Old 05-26-2008, 12:11 PM   #12 (permalink)
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Looks like it is made for decreasing rear end lift. While this isn't bad the design also looks like it will increase Cd.
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Old 05-26-2008, 01:02 PM   #13 (permalink)
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bam!...16" pizza @ $3.09 from wal mart, and it is made in the USA. I think I can just use a single bolt with a washer and nylock nut and call it a day.

it fits perfectly in the lip with no gaps. I found this out in the parking lot at wal mart while showing some random guy. He was like "what kinda mpg's you get in that tank". I said, "high 20's to 30's... -whips out pizza pan- and now will be aiming for 35-40!".. He didn't laugh but thought that was a good idea.


What sucks is the front wheels have clip on weights that would mean I have to cut the pan, but I need to get all 4 rebalanced anyways ( I have a weird vibration from the front left and I think the tires are not balanced correctly) and I'll have them put on stick on weights.

If I do the nut and bolt mount idea I won't have to make a hole to access the air valve stem( I have a factory set of tools with pliers) so I'd be good. Only thing I am worried about is overheating the front brakes and warping the discs, a common but not common occuring issue on these cars. They use solid front rotors.


so, what do you all think? Am I going the right direction. I have a lead on an AMG spoiler.

check this guys


though the 5 speed is a rare transmission someone did score one out in colorado, so they are out there. 4 speeds are more common than the 5.

check the airflow pic, my car is the 4 door so its not the same but the spoiler looks like it helps air flow

Last edited by TheDon; 05-26-2008 at 03:42 PM..
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Old 05-30-2008, 02:33 PM   #14 (permalink)
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I have an idea for a grill block and the material to use. I have a crap load of those overhead projector plastic sheets( scored them from my store manager when he was cleaning his office out, I use them to make stencils). I think with some clear packing tape and some of the sheets I can make a decent grill block. First I need to calculate cd and crr then start aeromodding. But since I have like 50 to 100 of these things I think I can make a lot of aero mods or prototype them all with them...

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Old 06-06-2008, 09:08 AM   #15 (permalink)
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Quote:
Originally Posted by TheDon View Post
I could block off the grill and seal it off but I don't know what the negative effects would be on my engine.
There will be no negative effects as long as the temperature stays in the normal ranges. Since W123s have "real" temperature gauges (not "buffered" pseudo-gauges like many new cars), you will be able to monitor the water temp.

Unfortunately, there's no oil temp gauge. This is a problem if you block off the grille, because the oil cooler isn't covered by the fan shroud. This means that the oil cooler will be a path of low resistance and the fan will draw the air through the radiator via backflow through the oil cooler, possibly screwing up the cooling for both.

I've installed a stock water temp sender in the oil pan on my 300td and have run an SPDT switch so I can read both temperatures on the same gauge (but obviously not at the same time). I've got another stock gauge and am trying to figure out how to hack it into the cluster.
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Old 06-06-2008, 01:29 PM   #16 (permalink)
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I was going to leave a slit to the side for the oil cooler or get a gauge for it. But I'm a little busy at the moment to tinker with grill blocking.

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