First time shooting a car with studio strobes.

Hey mate, lighting cars with strobes is particularly tough, you never seem to have enough light to cover the car. In this instance the lack of light on the top of the hood, windshield and roof really makes the car disappear into the background. You don't always need to have an entire car perfectly lit, ie you could have the background lighter which will then give shape to the silhouetted car but this should be done intentionally to add mood and done creatively to enhance the lines and shape of the car.

Also whilst there is always room for creative lighting, it is often safer to try and replicate a real light source. In this example there is strong light coming from the right side of frame and then strong light coming form the left. Perhaps trying to imitate 1 over head light might produce a more natural looking result? You will still want to light the sides and front of the car to show the details, but maybe at a much lower intensity than the overhead light.

What you might find easier is to lock the camera down on a tripod and walk around the car shooting multiple exposures with 1 strobe and reflector. So aim the light over the front wheel and fire, walk 2 steps down the side of the car and fire and repeat until you have covered all of the car. Then you can combine them in photoshop and choose what areas of the car you wish to light and which areas you want the light to fall off from.

Keep playing, car photography is fun :)