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Now that is solid information, but is it one-time record or average from several trips?
The reason I ask is simply becouse I observe mpg at each fill up as older cars did not have the mpg displays and even with W211 I recheck the computer. '
My mpg are always jumping up and down with each fill up.
Typical going south to LA on our I-5 ALWAYS delivers 5-10% better mpg than going back on the same road with the same speed.
Took me a while to consider strong winds that on desert usually go the same direction.
Same single fill up can be very misleading. Minimal slope at the pump can change the air bubble in tank from 3 to 5 gallons quite fast.
Thanks for giving food for toughs.
From start-typically 3.-5.0 hours of driving. It doesn't reset everytime you cut your car off so numbers can be slightly skewed however if that was the case-slowing down in the city and parking the car would decrease mpg's not increase it. But like i said i'll be sure to take a picture this weekend!!!!
The laws of physic says that lifting force is multiplying bag cross section by inside pressure.
On straight springs the cross section is constant and without changing the car weight the pressure must be constant regardless the height.
Note that I am talking about straight bags, while rear of W211 does have dual chambers that by playing with inflating one or the other can deliver different cross section and resulting pressure.
That would be partial answer to funkle question. To date nobody was able to post how the inflating is program on different setting and most of replies are base on personal observation.
I am always skeptic about personal observations, especialy people who don't understand physics as with human senses placebo effect plays huge role and unless you have data that can be measured, you have to take it with grain of salt. Than you will find trolls like member above.
My standard joke is that I always get higher mpg and better handling after vacuuming carpets in the car. It "is" true
You are right about constant pressure for unchanged weight. So pressure in begs is same if car is lifted or lowered and higher with 5 persons than empty car. But that has nothing to do with ride quality.
Lower car has less air in bags and it compress faster so you need less suspension travel to create required additional force when you hit a bump. Less suspension travel means stiffer ride.
Additional volume at rear suspension is there because of big difference in load with just driver or three persons and luggage in the trunk. It is compensated by additional pressure but if the volume stays unchanged suspension becomes stiffer. With additional volume (computer controlled) it stays softer.
You changed your opinion, so we are making progress.
We already covered that with lowered bags - bottoming up will change and you draw correct conclusion.
Additional observation - MB has additional air tanks added to bags on airmatic what has to make for softer give.
Replacement by Arnott don't.
I wonder if anyone has direct comparison?
You changed your opinion, so we are making progress.
We already covered that with lowered bags - bottoming up will change and you draw correct conclusion.
Additional observation - MB has additional air tanks added to bags on airmatic.
Replacement by Arott don't.
I wonder if anyone has direct comparison?
Nope. I did not change anything. And this is not opinion. This is fact. Lowered air suspension = stiffer ride.
Just to understand each other better, I have 50 years of driving experience, all the time lowered cars. All of them. I also have 40 years of experience as Mechanical Engineer, Automotive. This is not bragging. I know that many people on this board have higher education. This just may help one to open his mind.
You stated this few times so I must correct you. It is not true. With less air (lower ride) air bag gets stiffer. That's physics, but also experience. Check other replies in this tread.
Originally Posted by mishar
You are right about constant pressure for unchanged weight.So pressure in begs is same if car is lifted or lowered .
Don't know what you call that, but saying once that the bags get stiffer and then that the pressure does not change is changing the opinion in my books.
On personal note don't think mentioning the high education makes you smart man here.
Don't know what you call that, but saying once that the bags get stiffer and then that the pressure does not change is changing the opinion in my books.
On personal note don't think mentioning the high education makes you smart man here.
I never said that bags are stiffer. I said that ride gets stiffer. Bags are not stiffer if you touch them, but with less air their performance under additional load (bumps and portholes) is different. Ride stiffer.
As I said, mentioning certain education and experience should help one to open his mind. Like thinking - may be this old guy knows what he is talking. Let me check.
We are mostly friends here mishar, but unless you want to become "friend of Plutoe" you might want to consider proof-reading before hitting "post" button.
Than technically the air spring suspension does not get stiffer with level change. Its characteristic change, so yes with big bump on the road you will feel the "bottoming up" faster, but with small pavement cracks - it will be the same.
Than aren't we splitting the hair?
We are mostly friends here mishar, but unless you want to become "friend of Plutoe" you might want to consider proof-reading before hitting "post" button.
Than technically the air spring suspension does not get stiffer with level change. Its characteristic change, so yes with big bump on the road you will feel the "bottoming up" faster, but with small pavement cracks - it will be the same.
Than aren't we splitting the hair?
Friendship is nice, but I am not looking for friends here, or anywhere online for that matter. I am looking for occasional help with new to me vehicle. I am also always ready to help others with things I know. One of those is that air suspension is getting stiffer when lowered. On big bumps, small cracks and everything else you can find on the road or off road. I can post diagrams and calculations here but I am not sure that it would help anybody. Most people already know what I am saying and some just refuse to learn.
I am not questioning your observation cmiriv.
But going from 24.5 to 29 mpg is 18% increase.
You did not disclosure how much you lower your car, but don't you think 18% is a bit unrealistic?
There is lot of factors to mpg. I drive in the mountains and in crazy traffic.
I can drive much faster on flat highway and still get 20% better mpg than I do daily.
(our wagon 4M averages 16 mpg on short commute, or 8 mpg on grocery run)
So maybe you did more to the car, than just lowering, maybe you start driving slower, maybe you start filling up at different gas station?
Not to worry the brain dead member "kajtek1" aka pj just introduced you to the typical benz world(dating service) mumbo jumbo of swarming the post with oh-ah and wow replies, confusing the subject, spamming the topic and or off topic replies that add nothing to the post while hoping to convince you to go on a date to discuss the waxing of MB cars!!
Not to worry the brain dead member "kajtek1" aka pj just introduced you to the typical benz world(dating service) mumbo jumbo of swarming the post with oh-ah and wow replies, confusing the subject, spamming the topic and or off topic replies that add nothing to the post while hoping to convince you to go on a date to discuss the waxing of MB cars!!
I never said you can't get such mpg's but you said you gained 18% by lowering the car.
To be precise
Originally Posted by cmriv
Not driving slower-I don't have a lead foot by any means but if i'm driving 77mph for 4.5 hours and see 28.5mpg in comparison to the same trip when i first purchased the vehicle at 24.5-25.5 mpg i would like to believe it would be the only modification i've done to the vehicle to be the culprit as to why mpg's increased, lowering links. .
Now you backtrack in your statement as the picture is not showing 77 mph, but average 61 mph.
To tease you more, going back home this Saturday, I will try to drive at 60 mph for few miles and I am pretty sure my wagon 4M will get close what you got.
So my conclusion that you will not gain significant economy by lowering the car stays.
I never said you can't get such mpg's but you said you gained 18% by lowering the car.
To be precise
Now you backtrack in your statement as the picture is not showing 77 mph, but average 61 mph.
To tease you more, going back home this Saturday, I will try to drive at 60 mph for few miles and I am pretty sure my wagon 4M will get close what you got.
So my conclusion that you will not gain significant economy by lowering the car stays.
AVERAGE bro-not constant. there is a big difference. cruise was set to 77 the whole trip. I do need to slow down for stop lights and stop signs. It's not like the vehicle was parked on the highway and immediately started and drove. and is your 4m wagon a m273? does it have eight or nine cylinders?
I never said you can't get such mpg's but you said you gained 18% by lowering the car.
To be precise
Now you backtrack in your statement as the picture is not showing 77 mph, but average 61 mph.
To tease you more, going back home this Saturday, I will try to drive at 60 mph for few miles and I am pretty sure my wagon 4M will get close what you got.
So my conclusion that you will not gain significant economy by lowering the car stays.
you can take my 61mph average-lube it-and insert it BRUH!
Well, when I drive, I AVERAGE 75 mph and get 22mpg.
My wagon is 6-cylinder but than it was put in production in 1998.
What year your 5 liter come on the road?
Still we went long way from the statement that lowering the car gives you much better mpg.
wait till Sunday, but now I can only tease you with pictures from NOT LOWERED old 320cdi
Well, when I drive, I AVERAGE 75 mph and get 22mpg.
My wagon is 6-cylinder but than it was put in production in 1998.
What year your 5 liter come on the road?
Still we went long way from the statement that lowering the car gives you much better mpg.
wait till Sunday, but now I can only tease you with pictures from NOT LOWERED old 320cdi
Wait, you drive a diesel? IF so, conversation ended.... and driving your car on a lift is not a good way to express your feelings about my comments towards lowering my car helped bettering mpgs.
Question for you, why every time you post do you find a way to completely urk the hell out of people? This is like a ongoing thing with you.....
This is technical forum and posting precise data is crucial here.
When you insist the data was taken at 77 mph and then you post picture showing data at 61 mph, you do have a serious problem.
Read my reply above again. The diesel is a history, but gives some perspective to your photos.
Those cars do make 30 mpg quite often, so my guess is that when you had such low mpg before lowering the car and much higher after, is that you did a tune up in the mean time as well, or simply as your picture show- drive slower.
Right, like you posting pictures of a diesels mpg's when you clearly read that I drive a v8. How nice of you to be "precise"
Please be patient with the member--he is trying to get his post count up like over at the dating service---it's close to New Year---he was probably in the basement making sausage and fixing his bike---be patient and forget technical that translates into baking cookies!!
12-14-2015, 01:23 PM
