Dyno Vs.Drag Strip Testing

The BEST answer yet. Any calculator is a very best case scenario.

Roughly, how much difference in HP from the dyno to the time slip? Just curious.

You’d be surprised the number of guys who dyno something and put it in the car and the car is junk.

I had a customer running his mouth about my dyno numbers so I went to the track to see what the hell was going on.

First pass and anyone with the IQ of a bag of hair could see the converter was toast. This guy was swapping carbs, borrowing ignition boxes, changing valve lash...about everything under the sun. And the time slip never changed.

He didn’t want to hear the truth. His high dollar converter wasn't right. It couldn’t be the converter. He called the converter people and they said it was fine. It had to be the dyno lied.

After few weeks last he came by the shop to apologize and said I was right, the converter was junk. I said are you going down to the track and right before first round and publicly announcing that it wasn’t my engine, or tune up, or the dyno that was junk, but the converter all along.

Of course, he didn’t do that.

I could type all day the crap guys do and the engine builder/dyno get blamed for stuff not running.

Using speed it's down 31hp, ET it's down 51hp. I'm not sure how much loss there is driving the water pump, fan and alternator, plus header and ignition differences.