Dan Wheldon's tragic death on Sunday shocked the sports world. However, according to posts on his blog, the two-time Indianapolis 500 winner was frustrated with his car before the race.

Wheldon's death follows the tragic deaths of three other drivers in the same series - Paul Dana in 2006, Tony Renna in 2003 and Scott Drayton in 1996. Wheldon died after a catastrophic 15-car pile-up at the IndyCar series finale at Las Vegas.

In the second installment of his blog, published in USA Today, Wheldon mentioned: So far, things haven't been going very well as we've started our pursuit of the GoDaddy IndyCar Challenge this weekend at Las Vegas Motor Speedway, but I'm confident in the ability of the guys at Sam Schmidt Motorsports to find the problem and get it fixed.

He expressed frustration over the speed of his car; something that he claimed was an issue from the time he raced at the Kentucky Speedway. He wrote that his car - No. 77 Bowers & Wilkins Magnolia/William Rast Dallara/Honda was -more than 3 mph off the pace. If we start the race that far off the pace, it's going to be difficult to keep up.

However, being the charmer that he was, Wheldon was positive about the race as he knew everybody in our garage is trying their best, and they're going about it methodically and professionally, step by step, trying to get to the bottom of it...We all know what this team can do, and I know what I can do. At the end of the day, I have every confidence in them. We should be good in the race. They've worked hard at this, and they'll figure it out.

The horrific multi-car crash took place on Lap 13. Wheldon's car took off and then hit the catch fence. Workers immediately rushed to the crash site and Wheldon was airlifted to University Medical Center. He was pronounced dead, on arrival, by the doctors. His injuries were unsurvivable, said IndyCar CEO Randy Bernard.

Several cars were engulfed in flames and the impact of the accident was so horrific that workers had to repair holes in the asphalt.

Paul Tracy, a driver, described the shocking event to ESPN as a horrendous accident.

In his blog Wheldon wrote: As long as I can find some speed and keep up with the pack, I'll do everything I can to put on a show.

He certainly kept his word, as the spectators will certainly remember the heartrending show for the rest of their lives.