I may be out in left field here, but if I were to put one on my car I'd want it to trip everything but the pre stage/stage beams, even under full power.

Thats what you want.. mount the stripe taker about
4" off the ground with you in it... some cars get
higher at speed some get lower

My understanding is that the MPH is measured on how long it takes the car to break the last two beams at the end of the track. The extension breaks these two beams, unlike the stage beams which are broken by the tires. With an extension, the car will technically get to the last two beams quicker, but it will not change the speed at which it breaks both of them.

Starting line beams are usually right at 1.5"+-. The top end beams are generally 6"+-. The Rulebook has a 3" minimum rule to make sure you clear. Means nothing about how high the beams are. If the rules allow a pecker extender then why not take advantage of it. Some of the new late model cars have 40" of front overhang on them. Meaning when you leave the have an immediate 40" advantage on cars like a Dart that is not in the weeds.

I believe the NHRA's current stance on pecker extenders is they are not legal. They are only allowed to be even with the farthest point forward on the car, ie the leading edge of the front bumper. Many many bracket cars use stripe takers on the front end. Once of those things you need to pay attention to in the lanes for sure.

thank you for clarifying The Starting Line beam height.. I will be taking the car out tonight to test the new converter as well as the extension.. hopefully all goes well

MPH will be faster if a driver can break the beams with the front tires but hit the brakes and dip the nose for a stripe taker or spoiler to trip the last MPH beam, which is also the finish line/stop ET. They wouldn't be losing much actual forward momentum, but it can dip the front with soft springs/shocks.

Myron, you're right, that's the only way the MPH could be affected. From what I've seen of the cars running these extensions, they are fast enough that the front of the car is slammed to the ground at speed for aerodynamics. Not to mention the speeds they're running. I find it hard to believe any of them are diving on the brakes to "gain" a couple mph.

Not for MPH, but it can still throw off the opponent when he doesn't know where to judge - if the lights are being tripped with the wheels or the strip taker/spoiler.

Let's say you have a car that goes 140 mph in the 1/4. If you add a pecker extender, how much ET do you lose per inch?

You should gain ET, run quicker, by some .0001s, not loose it due to the clocks stopping sooner off of the stripe taker, correct
If your traveling at 140 MPH when you multiplied 140 MPH by 5280=739200 which is the feet per hour, correct If you multiply that by 12 inches for inches per hour you get 8870400 inches per hour which = inches per minute when you divide that by 12=147840 inches per minute which divided by 60 again to get the feet per second=2464 inches per second which also = 205.33 Ft. per second, correct
If you took a 18 inch extension for the stripe taker from the front edge of the tires it should be the same as dividing 2464 by 100 to get the inches per one hundred of a second, correct 2464 divided by 100 =24.64 inches per .01 ET so the gain should be less than .01, correct
I'm not a math guru or drag racing geek so those more in the know on this please chip in if I have part of this math incorrect please so I can learn the proper way to figure things like this out

OK, Cab, I took your math to the next level and came up with this:

.000002857 per mph per inch. So lets look at an 18" extender at 140: 18x140x.000002857 = .0072 quicker ET.

At 200 mph: .010

I read an article on them and their math is very similar to Hemi Joel's. It ain't much but for a competitive racer... it all counts. I personally don't like them at all but I get it.

This came into our shop for repairs today. He says it's a work truck, but I think it's one of those sleepers with an adjustable pecker. What do you guys think?

Too far up in the air.. needs to be a lot lower

It's hard.