Hello all, the other day i was driving to another city which gave me the chance to speed for fair periods of time. I noticed at 220KMH that the coupe feels very light and so does the steering wheel, making the car feels nervous and non-confidence building i know that at those speeds is not good to feel comfortable but i've had other cars that are not Sport Cars and made them go to 210KMH and they werent this nervous. My question is, how can i make the car be more stable and feel solid. We get the chance to reach these speeds when travelling to other cities and if you have the horsepower you can go even faster. The M coupe has the hosepower but im afraid to test its limits after how it felt. What can be done to correct this for good? All inputs and recommendations are highly appreciated.:thumbup: Thanks

220km is about 135mph.
my roadster feels fine at the 135mph. feeling rather "heavy" imo. 135 is as high as my little 2.5 would go:( but if I had more power, I think it can do 150 no prob.

I have sport pack, GoodYear Eagle F1 NoN-RFT, M-steering wheel to help with stability at high speed :)

Just curious, what other cars which feel more stable? Cars usually have speed sensitive steering which makes you feel more confident at high speed. Sensitivity can be different, for example my E class feels more stable at high speed but actually it is just feeling.

If you are running the stock continentals lose them. Other than that it's time for suspension.

Just curious, how's the stingray at speed?

If you are running the stock continentals lose them. Other than that it's time for suspension.

Just curious, how's the stingray at speed?

The stingray is a nervous wreck, nut im planning on a overhaul for the suspension.

Just curious, what other cars which feel more stable? Cars usually have speed sensitive steering which makes you feel more confident at high speed. Sensitivity can be different, for example my E class feels more stable at high speed but actually it is just feeling.

S class, S60. This cars have been more stable IMO. Just wish theres as somthing i can do to the coupe that would greatly improve its behavior at high speeds.

A lower stance would help as turbulence under the car probably is not helping. Short of adding aerodynamics for added downforce, I don't really know of what else could be done. I have had mine up to a higher speed than I would like to admit and it felt fine :dunno:

There were cars that felt much more stable at that speed, but they did not have the nimbleness to do anything other than go straight.

I have had my coupe up to 150Mph (appx 250Kph) but I will not tell you where :rolleyes. It did feel a little light but the road was not constructed for this speed and the only other car I have to compare this to was a mazda3 hatchback that I took to 112 Mph (limited) that scared the crap out of me.
I don't think I will have the opportunity to go 150 again anytime soon, but the car did well in my opinion

I have had mine to 140mph+ several times. Even redlined in 5th with the speedo showing 168 (yes I know the speedo it is overly optimistic). The steering felt fine to me. Guess it depends on what you are used to and have to compare it with.

My car has felt pretty stable at those speeds. However I have noticed that the car is not the best at handling high speed dips etc....

I've had mine significantly higher than that and it felt pretty table.

For comparison purposes, my 330 feels less stable than the Z at those speeds (and my Alfa Romeo felt dangerous at those speeds).

I would change the tires first and then get some coilovers....

S class, S60. This cars have been more stable IMO. Just wish theres as somthing i can do to the coupe that would greatly improve its behavior at high speeds.My guess was right. Indeed Benz feels more solid and confident at high speeds. Again we are talking about cars much heavier than Z, maybe it is an answer. Another thing is S or E class were designed to be good cruiser for long relaxed driving at autobahn speeds, when Z was designed as a sport car with frequent acceleration and braking and drive over twisty roads. However Z is perfect cruiser for US, since high traffic and your speed will be limited by 70mph by other cars even if you trying jumping between them.

The steering ratio on the MZ4 Coupe is tuned, like the M3 Competition package, for a tighter and quicker response at all speeds. The result is the smallest movement at moderately high speeds (90-150 mph) will create the sensation of "jittery-ness" or instability. While it is unnerving if you don't know how to properly drive at high-speed, it is not a design flaw. I've had my MZ4 Coupe up at ~140mph for extended period of time, all you have to do, is learn is to keep a very light pressure on the steering wheel (at that speed I drive with my thumb and index finger resting very lightly on the hump) and make absolutely the smallest, most subtle adjustment possible. True for all sports cars at such high speeds, except cars with higher steering ratio or buffered steering does not exaggerate such small microscopic movement in your hands.

The steering ratio on the MZ4 Coupe is tuned, like the M3 Competition package, for a tighter and quicker response at all speeds. The result is the smallest movement at moderately high speeds (90-150 mph) will create the sensation of "jittery-ness" or instability. While it is unnerving if you don't know how to properly drive at high-speed, it is not a design flaw. I've had my MZ4 Coupe up at ~140mph for extended period of time, all you have to do, is learn is to keep a very light pressure on the steering wheel (at that speed I drive with my thumb and index finger resting very lightly on the hump) and make absolutely the smallest, most subtle adjustment possible. True for all sports cars at such high speeds, except cars with higher steering ratio or buffered steering does not exaggerate such small microscopic movement in your hands.

Thanks for the input.

I've had my M coupe upto indicated 160, which we all know is probably 150-155. It feels good, but it depends strongely on the road. I have done this speed on 2 different roads in this car. The one was a relatively new bypass, and the other was a county road. The county road has dips that aren't prevalent at 55, but at 140-155, they upset this car a lot. As for comparison with other cars. I've taken a Bentley GT 160 and it felt so smooth and very stable, but it does weigh 5300lbs and has the rear spoiler for downforce. It was very stable.

Yesterday i drove to the airpot to pick up a family member, the road was wet because it was raining and at the time there was a drizzle. Everytime i went over some little puddle the car did hydroplaning and i know all cars do this but i felt uncomfortable. I was doing 150 to 170 KMH it was scary but fun to keep the car under control. I know the car is relatively light but at these speeds i cant help but think i need to get a spoiler. Anybody else had a high speed experience in the wet?

Uneven tire pressure and alignment makes a huge difference in high-speed stability. If you haven't had a good alignment by a performance-oriented shop, you might find it the best $100 you've spent on your car.

Yesterday i drove to the airpot to pick up a family member, the road was wet because it was raining and at the time there was a drizzle. Everytime i went over some little puddle the car did hydroplaning and i know all cars do this but i felt uncomfortable. I was doing 150 to 170 KMH it was scary but fun to keep the car under control. I know the car is relatively light but at these speeds i cant help but think i need to get a spoiler. Anybody else had a high speed experience in the wet?

Have you EVER tried driving any other car at over 100mph over a puddle of water and not hydroplane?

You can't defy physics. A friend of a friend of mine crashed and totaled his Porsche 911 driving like an @sshat in the rain and blamed Porsche for engineering a "poor handling car in the wet." :rolleyes

How about you assess the conditions on the ground and learn to drive at a moderate pace based on your surroundings, instead of trying to prove Darwin right?

Physics will push your car moving straight, and than more speed than more. However here is linear proportion in opposite to energy.

Have you EVER tried driving any other car at over 100mph over a puddle of water and not hydroplane?

You can't defy physics. A friend of a friend of mine crashed and totaled his Porsche 911 driving like an @sshat in the rain and blamed Porsche for engineering a "poor handling car in the wet." :rolleyes

How about you assess the conditions on the ground and learn to drive at a moderate pace based on your surroundings, instead of trying to prove Darwin right?

Did you NOT read the part where i mentioned that i know all cars hydroplane over a puddle of water or are you trying to prove something? Im not defying physics, im getting to know my car at its limits which in this particular scenario felt different and more uncomfortable than in other cars. Isnt this forum the place to tell all about the Z4 or did i miss something?
Not cool

I've taken my Z4M Coupe to 140mph on several occassions with a passenger in the car, and all have guessed that we were only going 100mph..lol. The car feels great at high speeds.