The two lines should cross at 5252rpm on EVERY dyno graph. If it doesn't, something is wrong with their dyno calibration or calculations. That dyno sheet is worthless IMO.

 

oh ok! c i didnt know that! my first dyno @ another place it does cross @ 5252

 

the guys who did my first tune put my truck on the rollers running off 7 cylinder & wuz more worried about the fuel curve then the miss! i heard it miss a couple of times but just thought it wuz part of the tuning process!
270hp/303tq horse peak still around 5300 r so!

 

They tried tuning it on 7 cylinders? I would find somewhere else to get a tune ASAP....

 

i did! i got a live tune by Wheatley! i didnt know it missing till i try to drive it home! so i turned around & told them about it & they said they new it wuz missing but didnt know why! so when i got home i checked the plug wires & one wuz burnt & cut in 2 pieces!

 

Not necessarily true. Assuming the hp scale on the left vertical axis and the torque scale on the right vertical axis are the same, then yes, the two plots should cross at 5252rpm.

BUT, if the scales are different, which it looks like they are after staring at the dark, blurry picture a bit, they will cross somewhere different. That doesn't mean that the dyno is meaningless, it just means they scaled the graphs differently so to make a prettier output when actually put on paper.

 

the guy did make the horse curve better to see before he printed it out for me so idk if that would cause the problem r not

 

Well when I say better, I mean so you have two peaks relatively at the same vertical level. It just makes printing/viewing easier. I mean nothing about actually modifying the hp/torque output values from what they really are.

Likely the reasoning is because of the ~70 unit difference between your torque output and your hp output. A graph with equal scaling on both vertical axis would have seen your torque curve peaking way higher than that of your hp, and, to the average viewer, it would've looked weak-sauce.

 

I'm really new to all this stuff! So what ur saying is that with the torque being so much higher the the hp people are thinking the dyno is off?

 

Nah, that's not the reason. I have no doubt those numbers are legit, its just when the graphs don't cross at 5252 rpm (for which there is a mathematical reason behind going all the way back to what defines 1 hp), the accuracy of the dyno comes into play, but this effect will also come if the vertical scaling has been adjusted, which is has in this case.

In short, don't lose any sleep over it. I don't like it when the vertical scales are different for hp and torque because I like to directly compare the respective curves of each, but oh well, it's how they did it. You just have a really torquey engine I guess.