why doesn't everyone dyno starting at 1000rpm?
 

It seems a lot of dyno graphs start at 3000rpms. Is that because people don't want to see how much low-end torque they've lost compared to stock? <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> It also seems to make a big spike on auto cars without the TC locked up, when the graph starts at a higher rpm. If you started at a lower rpm with an auto, would the spike still be there?

I dynoed at one shop, the guy said to go from 1000 (which I wanted to ask about doing anyway). Next dyno was at ARE, and it was done from 2500rpm (someone else was in the car).

This might not be an "internal engine" question, but the reason I want to know is because I am trying to pick a cam. I am hoping with LT headers, the cam, and an UD pulley, I'll have more torque than stock at any rpm.

Thanks.

Re: why doesn't everyone dyno starting at 1000rpm?
 

You can't dyno from 1000rpm's on an auto car. It will downshift. That is why you see so many dynos from so high. Where I dyno my car on M6 cars they start them around 2K. Depending on gearing and stall on the A4 cars it is anywhere from 2.5K - 4.0K

Re: why doesn't everyone dyno starting at 1000rpm?
 

tough to get a higher stall A4 to dyno that low! lol now as for MN6 guys, well most of my dynos start at around 2300 - by the way have you ever been dynoed?

Re: why doesn't everyone dyno starting at 1000rpm?
 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by gator's 99TA:
<strong>tough to get a higher stall A4 to dyno that low! lol now as for MN6 guys, well most of my dynos start at around 2300 - by the way have you ever been dynoed?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Twice, two different occasions. The first time I was in the car, and the guy said to start at 1000rpm, and I did.

Next time (different shop), they had someone in the car, and he started at 2500rpm.

Re: why doesn't everyone dyno starting at 1000rpm?
 

At some RPM the stock setup will be better, it will probably be idle to 1500 rpm. This is what you find as you encourage more airflow into the motor.

More airflow when you don't need it == lower velocity == less cyllinder fill.

Look for slightly less cyllinder fill off idle and very very low rpm for head cam pkg's vs stock.

Only way to tell is like you say, dyno from 1000 rpm.

Re: why doesn't everyone dyno starting at 1000rpm?
 

Never run my car anywhere..even on the street at WOT under 2500rpm. Don't like lugging my motor like that either.