A pet peeve...

[TooManyFords]

<rant>

I like looking at dyno graphs. I dig them. They make me all tingly seeing big numbers.

What I can't stand is when someone doctors the graphs so that the horsepower and torque do not cross at 5250 rpm. I know you've seen them, the left side of the graph is doctored to be a different scale than the right side. Supposedly, this makes the torque curve look way better than it really is, or horsepower, whichever.

Next on the list is when they leave the bottom of the graph as miles per hour. Why? Why in the hell do I care at what mph the peak horsepower or torque would be made? Seriously. It happens at the same rpm in three different gears. Just leave it set to RPM and pretend you know what you're doing when you actually make a pull.

Bottom line; if you run a dyno, quit fscking with the numbers to make it seem like you are a tuning god. You'll never see hosed up graphs in HOT ROD, CarCraft or MM&FF.

</rant>

[Krytin]

2nd that^^^^^^^!

[ImpalaSlayer]

:concur:

+1

[FordNut]

True, but I believe what's happening is they are letting the dyno software auto-scale so the low and high numbers for HP and Tq are enough different that it screws up the graph. I've seen my tuner go into the setup and change the scales to be the same before printing out my dyno graphs on numerous occasions. I just wish everybody would do that.

And the cursor with data fields where the graphs cross the cursor just messes up a perfectly good dyno sheet. Fine for analyzing data, but shouldn't be on a customer's "souvenir" dyno printout.

I do like to see both the AFR and boost at the bottom section of the graphs too, and very few of the dynos I've been on are setup to datalog the boost.

[SpartaPerformance]

Agreed on the rant

[Joe Walsh]

Couldn't agree more...when I see a dyno sheet with "MPH" on the bottom scale, I think WTF!
Who cares what the MPH is...I've got a transmission with gears to take care of that!
Show me what the 'RPM' is you moron! Are they too lazy to hook up the sensor to the #1 plug wire...?

"My car makes 435 RWHP at 87 MPH!"....:dunno:

BTW: Be careful of the guys who love to use 'smoothing' functions to make the A/F look super sweet.

[Local Boy]

Interesting!...I've always wondered about that....

I agree....!

Aloha

[ImpalaSlayer]

question about smoothing, the higher the number, the "smoother" it makes the lines right?

[RacerX]

BTW: Be careful of the guys who love to use 'smoothing' functions to make the A/F look super sweet.
Yup! My dyno guy actually explained all that to me. He was trying to find the sweet spot and I brought in some of the dyno printouts from some of you guys here and he was shocked, he said the ones I brought to him were done correctly and they overlaid perfectly with mine.

[juno]

<rant>

Next on the list is when they leave the bottom of the graph as miles per hour. Why? Why in the hell do I care at what mph the peak horsepower or torque would be made? Seriously. It happens at the same rpm in three different gears. Just leave it set to RPM and pretend you know what you're doing when you actually make a pull.

</rant>

probably a ricer thing!!!

[Haggis]

How many here manipulate the dyno with tire pressure?