Byron used to do the exact same thing. I dreaded going out with just him and me cause i knew what was coming. We just did daily little trips down the road and i tried my hardest to keep calm.
He got better at travelling around 9 weeks. I hung a toy where he could see it and i think it was around that time he started to take an intrest in toys so it may have helped.
No one believed me when i said he hated the car (until they saw first hand!)
Eventually he grew out of it - or got used to it - cause he is fine now. He also got better once i put him in a proper car seat and got rid of the capsule.