Stillen Headers installed - Review/Pics/Vid/Dyno

Originally Posted by user123

This is McFly from GenCoupe.com Forums - Your Hyundai Genesis Coupe Community

Someone over on our board posted a link to this thread. I'd like to help out. If you don't find this beneficial then feel free to ignore it.

I've analyzed your Dyno graphs. I hope you find this information helpful.

Enjoy:
Why did the 370Z gain 3whp on the Dynojet and 11whp on the Dyno Dynamics?

Answer is that the Dyno Dynamics dyno wasn't done the same before and after. The 370Z continues to make more power the higher the RPM you take it. So, if you short change the car and don't run it to it's highest RPM possible, then you don't get a good reading. They have to run the car to the same RPM on the before dyno, and the same RPM on the after dyno. On the first Dyno Dynamics dyno run they ran the car to only 7100RPM, then on the second dyno run they ran it to 7600 RPM. So, since they ran the car to a much higher RPM the second time, it's only obvious that they were going to get a higher reading, and that they short changed the car on the first dyno run.

If you look at the power that was made at 7000 RPM on both [before and after] dyno run's to make it fair, you'd see that they made 305whp on both the before dyno plot and on the after dyno plot. They made no power, and actually lost power at anything below 7000RPM, in fact. That's how you should be reading the dyno plots, at the same RPM on both the before dyno plot and after dyno plot. Another way to read the a hp graph is to get better resolution of the hp plot... and this is to actually be reading the torque plots. Yes, understand a hp plot and where the gains are by reading the torque graph... and what you see is that there was a loss everywhere, except that the difference disappears at high rpms, and there is no gain/loss.

Put plainly, either learn how to read a dyno plot OR even more simply, you can throw out the Dyno Dynamics readings because the operator screwed up. RUN IT, and RUN IT HIGH!... or at least run it the same.

Hp gain on stillen headers on a 370Z, is about 10hp loss to 3hp gain, depending on where in the RPMs you are... and the gain of 3hp is only for a split second at 7000RPM. WASTE OF MONEY!

People think they know, but they have no idea.


Like I said, If you don't find this beneficial then feel free to ignore it. At the least, I hope I don't get flamed for trying to help out.