tire pressure - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 04-18-2004, 01:20 PM Thread Starter
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tire pressure

Hi,

I have an 04 SL55 and I am interested in finding out the best tire pressure for track driving. The maximum tire pressure stamped on the tire is 51 psi and MBZ recommends 36F and 41R on the gas filler cover hatch. Dealers have not been very helpful with an answer to this question. I tracked it at 51 for all four tires, but wonder if it would do better with less.

Any experience with this out there?

Thanks,

Ed
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post #2 of 7 (permalink) Old 05-07-2004, 09:50 PM
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RE: tire pressure

Wow that's quite high. I would put whatever it says on the gas cap. Those readings are for regular driving. If you intend to speed above 160 kph for extended periods of time then raise it to max. As for the front keep it a little lower than the back other wise the steering will feel like its wondering all over the road. Most Benzes have a lower setting in the front to make it more stable, and the weight bias does not change to much. As for the back it's higher to allow for passengers, fuel, and luggage and most importantly rearward weight transfer when you floor it.

So in summary, the reading inside the gas cap is a compromise for comfort, load, and handling.
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post #3 of 7 (permalink) Old 05-25-2004, 10:36 AM
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RE: tire pressure

Depending on how serious you are with driving on the track, you might want to consider buying track tires for the car. Track tires have more rubber in them then street tires. The tread on them are also different then street tires...more suited for the tracks.

In general, I think running lower pressures on a track is better because they will give the tire more surface area to the ground...and that is what you want.
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post #4 of 7 (permalink) Old 06-21-2004, 01:26 PM
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RE: tire pressure

good ol shoe polish is your friend, it will tell you whether you are over or underinflated. i use RA-1s on my 16v and the optimum pressure for me is around 40psi hot.

95 E320
86 16v
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post #5 of 7 (permalink) Old 06-23-2004, 01:55 PM
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RE: tire pressure

FIRST NICE CAR, BUT U SHOULD DO WHAT MERCEDES BENZ SAYS, USE 36 IN FRONT. OR IF U R A REAL RACER U COULD FIND A PLACE THAT PUTS NITROGEN. SEE WHAT AIR DOES AS U KNOW IT EXPANDS AS IT HEATS UP CUZ OF THE MOISTURE, BUT NITROGEN DOESNT EXPAND LIKE AIR SO IF U PUT 36 PSI, IT STAYS LIKE THAT EVEN IF IT HEATS UP AND WELL IF U GO FAST ENOUGH AND DO A TURN U COULD TELL THEN DIFFERENCE IF U USE AIR, THE PSI GO UP AND REALLY CHANGE THE AFFECTS.BUT WELL NASCAR USES NITROGEN AND THEY ARE SEROUIS ABOUT RACING.


Borrelli.
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post #6 of 7 (permalink) Old 10-14-2004, 10:51 AM
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RE: tire pressure

Well even with nitrogen the preassure will increse as you heat the tires up. That is basic physics.

The reason guys run nitrogen is that air can contain water vapor and that will respond differently to heat and causa different hot pressure depending on how much is present. This means I can be hard to ensure proper hot tire pressures. I use air in my race car's tires. I start at 32psi and the heat up to 39 psi when on the track. For the tire (Toyo RA-1), its size, and car weight this is a very good hot pressure.

Most Street tires probabably need 36-38 cold. It is ussally better to be a bit high to ensure they don't roll over when on the track. There is also a peak grip level such that at the proper temperature and pressure the tire will give the best grip too much or too little pressure will cause the tire to lose grip. Race tires can be particularly sensitive to this while most street tires are pretty tolerant.

Joe Paluch
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post #7 of 7 (permalink) Old 03-01-2005, 12:30 PM
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RE: tire pressure

For all AMG cars the recommended pressures listed on filler door should be followed. I wonder if euro spec pressures are the same?

Follow directions factory knows best unless your using full race rubber.

Redwood

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