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  #1  
Old 11-06-2000, 12:26 PM
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Location: Ontario, Canada
Posts: 463
I made my first long trip in my 190E this past weekend and took it on the highway. The car drove exceptional until up around 190km/h when I could feel a slight vibration. It appeared to be from the backend/differential.
There wasn't a noise or anything but to me at least there seemed to be a slight swaying at times almost as if the diff gears were out of line....I apologize for the poor details but compared with my fathers 2001 Volvo S40 (Canadian spec...5 speed auto from S80) there seems to be something out of line. In long sweepers its fine and handles better than anyfront drive car I've driven (this includes the Volvo, Lexus ES300) but not so in a straight line compared with my friend's fathers '98 540i 6 speed and this is up to speeds of 240km/h. Could anyone possibly offer my any ideas,comments or even stories on this topic? Thank you, MIKE MCKINNEY

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'91 190E 2.6
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  #2  
Old 11-06-2000, 01:13 PM
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Join Date: Nov 2000
Location: Jacksonville, FL USA
Posts: 113
Your rear tires may be out of balance ever so slightly, Im not sure if it is possible to have perfectly balanced tires. On my Integra, I got a set of 4 new tires and had the tires balanced before I took a trip down to Fort Lauderdale, well the car drove smooth as silk up until around 85mph where the steering wheel started shaking alittle bit. Anyways, why are you driving 190km/h in the first place?

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Adam,
1986 300E
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  #3  
Old 11-06-2000, 01:42 PM
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Location: Ontario, Canada
Posts: 463
pezzy

I don't drive like that all the time......
I just wanted to see what my car had up there and was impressed!!!!!It got up to speed quickly for an automatic and got to 190km/h in no time at all....It gains speed almost as fast as my brothers contour SVT which doesn't have much over that speed but, would get embarrassed by my fathers Volvo S40 which really comes alive at 140km/h +
I don't advocate reckless high speed travel on public roads but when is 3 o'clock in the morning and nobody is out on the 401 why not?
I appreciated your response and would really appreciate if anyone else had any ideas on this topic? I can say that occasionally the car does wander off course at slower speeds in a straight line but, not all the time. It can be arrow straight down the same road a few minutes later....same road,conditions,
pavement consistancy etc...Please offer anything you can think of!!!

------------------
'91 190E 2.6
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  #4  
Old 11-06-2000, 02:12 PM
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Location: Toronto, CANADA
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My first guess would be tires, second thought might be that you could use an alignment.

190km/h would get you to Toronto pretty quick from London.



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Jason Priest
1986 420SEL
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  #5  
Old 11-06-2000, 02:36 PM
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Location: Ontario, Canada
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420SEL

we do live pretty close....you know what I'm talkin about with the 401 then!!!Have you had any fun out there yourself? Toronto can get pretty nuts at times with traffic. I'll check out my tires but I would doubt that would be the problem. I'll probably have to replace them in another month or so due to wear but the feeling I'm talking about can be felt ever so slightly in the driveline. I'm still thinking diff/rear end or the wheel bearings. Can anyone suggest anything? The first project I was going to perform on my car was the transmission service....should I have anything else checked first? Any help would be greatly appreciated. Thank you
MIKE MCKINNEY

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'91 190E 2.6
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  #6  
Old 11-06-2000, 02:52 PM
J.HIDALGO's Avatar
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Location: Jax, FL
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Do a search on rear end/linkages. If you haven't done it already.


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J.H.
'86 300E
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  #7  
Old 11-06-2000, 03:50 PM
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Location: Sherman Oaks, CA
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Inside your gas cap there is a note saying if going over 100 mph, raise tire psi by 8 lbs pressure. At least thats what my 300Ce says....

i think with less pressure at higher speed, the tires will wobble a bit, but by adding pressure you make the tire stiffer which aids in high speed driving.

Alon

------------------
'92 300CE
Metallic Black (Blue Flaked) on Parchment
Clear Corners
94-95 Tail-Lights
Black Grille Insert
78.5k Miles

Future Upgrades:
Sportline Suspension
17" AMG Monoblocks or EVO II's
Euro Headlights
Performance Chip
AMG Exhaust

Click here to Go To My 300CE Page
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  #8  
Old 11-06-2000, 08:00 PM
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Location: Miami, FL
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Raising the tire pressure at higher speeds may be a good idea, but I would advise against it. Case in point: when I bought my 1990 300-D it had 4 Yokahama steel radials on it. I drove from Miami to Atlanta at around 75-80 mph. Somewhere on the way home, I checked the air and filled each tire to 34 psi, according to the gauge at a Texaco station and checked the last tire with my own gauge to make sure the other gauge was accurate. Within 400 miles, each tire got a bulge on it and some serious tread separation. I called Yokohama and they sent me to NTB, where they told Yokohama that I has 42 psi. Yokohama said that they woldn't ,make any adjustment. Then I told them how I was planning a website about how Yokohama didn't stand by their tires and they agreed to compensate me for 75% of the cost of any brand of new tires. I got 4 Dunlops and have had no further problems.

But if you DO overinflate, reduce the pressure and watch them at the tire shop when they check it. I don't think this tread separation is all that rare: I have lost maybe a dozen tires to tread separation in the last 20 years.

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  #9  
Old 11-06-2000, 08:56 PM
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Location: ajax, ontario, canada
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shyne,

where on the 401 do you have your fun? Where i live, i have to drive about 100km away from the Greater Toronto Area to have some real fun.

i myself have reached about 195kph on my 5spd 190e2.6 on the 401 but only for a brief moment. I was overtaking an old S-class benz once with about a 60kph speed differential, to show him what benzes are for ... ;-)

try rotating your tires in the recommended pattern (fronts going diagonally across rears, and rears going straight up to fronts) and see if the vibration transfers to the front and is felt through the steering wheel. If it does, then you know it is caused by your wheel/tire balance.

everytime i rotate my tires, or switch back from my winter tires, i take the car out on the highway to see if there is any vibration and at what speed. If it happens at 140kph, i check it see if it goes away at 160kph (!).

happy motoring ...

[This message has been edited by bobbyv (edited 11-06-2000).]
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  #10  
Old 11-06-2000, 08:58 PM
LarryBible
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DON'T RAISE YOUR TIRE PRESSURE!

Set your pressure while the tires are cold. As they warm up, expansion will find the right pressure.

Set the pressure cold.

I ran extended high speed on the Autobahn this summer. I ran hours at a time in excess of 110 MPH. I did it on tires that were inflated cold and were H speed rated. They worked great.

Don't overinflate for high speed! This is a safety thing.

------------------
Larry Bible
'01 C Class, Six Speed
'84 Euro 240D, manual, 533K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles
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  #11  
Old 11-06-2000, 09:53 PM
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Location: Lehigh Valley PA
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I'd like to share a recent observation with my 1984 300SD. I have 205/65R15 Toyo Proxes H4's. I haven't been very diligent about checking tire pressures, and I noticed that my left front was a few pounds low, and the rest of my tires were about a pound low. I increased the pressures to 29 psi front / 31 psi rear.

MB recommends 28/30 but the gas station with the free air pump is about a mile drive and it was a slightly warm day, so the extra psi should not be an issue when it cools down.

Anyway, prior to doing this my car seemed a bit "squirrely", almost unstable under certain conditions. Balancing the tire pressures so that both tires on each axle were within a quarter psi of each other seemed to help much more than I would have expected. I noticed improved "tossability" and crisper turn-in. Stability at 70 mph was improved also. Just my observations...
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  #12  
Old 11-07-2000, 01:44 AM
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Location: Ontario, Canada
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bobbyv and J. HIDALGO....thank you for your replies.....bobby, I live in London around 2 hours away from you where I have plenty of open road especially at 2 or 3 in the morning!!! J. HIDALGO, thanks for the tip on the rear end linkage. Anything could be possible so I will look into things when I have time. I know my tires are not the culprit, although they are worn somewhat, they are within specs and are balanced as I do not have that type of vibration at speed.

------------------
'91 190E 2.6
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  #13  
Old 11-07-2000, 01:54 AM
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Location: Sherman Oaks, CA
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All I was pointing out is that in my gas filler cover, it says warning raise psi 8 lbs if you are going to go over 100 mph.

All I was doing was relaying that information. I never said he should, just stated what the car says...

I also hope that I dont make claims that I am unsure about. hence the words I think..

Alon

------------------
'92 300CE
Metallic Black (Blue Flaked) on Parchment
Clear Corners
94-95 Tail-Lights
Black Grille Insert
78.5k Miles

Future Upgrades:
Sportline Suspension
17" AMG Monoblocks or EVO II's
Euro Headlights
Performance Chip
AMG Exhaust

Click here to Go To My 300CE Page
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  #14  
Old 11-07-2000, 11:04 AM
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Join Date: Nov 2000
Location: Ontario, Canada
Posts: 463
Ashman; I have the same info on my gas door aswell. I hope everyone who drives their car at highspeed takes tire specs into account aswell. Blowouts are a possibility at speed. 5 or 6 years ago I saw the back end of a 7 series bmw destroyed from some sort of tire related problem. The car seemed heavily loaded as well so the maximum load tolerances were probably surpassed. That tire destroyed the rear bumper assembly, rear quarter, and who knows what in terms of suspension. People really need to spend a little more time on checking tires and pressure in them and take it seriously. Anyways my original problem I noted with my 190 is very hard to describe, I'm thinking of having the rear diff flushed and inspected when I splurge on some new radials in the not to distant future. If anyone else has any other ideas on what the vibration might be coming from the rear of the car at high speed, I would greatly appreciate your reply. Thank you everyone, Mike Mckinney

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'91 190E 2.6
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  #15  
Old 11-08-2000, 07:12 AM
LarryBible
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You learn something new every day.

I did not know that there was such a message on the tire pressure decal. I will study it before I get in the car this evening to go home.

I would expect that you still should not exceed the maximum cold inflation pressure indicated on your tires, which is almost always 35 psi cold.

The main point that I was TRYING to make was that you should not raise your tire pressure while tires are warm. If you raise the pressure, do it with cold tires.

Have a great day,

------------------
Larry Bible
'01 C Class, Six Speed
'84 Euro 240D, manual, 533K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles
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