After getting my side skirts installed I decided what the hell ill get it dyno'ed today since ive never done it. After strapping her down the guys asked me what I expected and I said probably 140hp. The first run it hits 140.7hp. Surprised everyone, they were expecting around 120hp because I just have an intake and exhaust. The second dyno goes by perfectly and it hits 145hp. Im really happy with these numbers considering its an auto. I tried searching but couldnt find any other auto dyno sheets. Is this around what others have gotten with just an intake and exhaust. (Done on a Mustang dyno btw)

(Note: I am about 1 mile above sea-level here in Colorado, not sure if that makes a difference.)

 

Very nice, I was wondering about that myself.

 

Mustang dyno explains the whole thing. They're.. unpredictable to say the least.

An auto tC I know with I/H/E dynoed 175 on a mustang dyno, which is completely off.

An auto tC that I SAW getting dynoed with I/H/E made 149 WHP with I/H/S-pipe/Full Exhaust. This was on a Dyno Dynamics dyno. I made 137 WHP with just I/E on the same dyno, same day.

 

What kind of exhaust do you have?

 

I have both the Injen Exhaust and Intake.

 

Thats cool but likely innaccurate. My highest was 139.4 I believe on a dynojet? That was with intake, header, and pulley. I figure Im at around 130 or so right now since I no longer have the header or intake. I have an exhaust though and still my pulley. I'd like to get a nitrous run.

 

my auto got 139 with an s-pipe and trd axle back only on a dyno dynamics a couple of weeks ago.

 

Same time and place that I ran 137 and ScottyG ran 149.

 

All lies!!!!!!!!!!!!!!!!!!!!!!!!

























JK

 

So then whats a reliable and accurate dyno run? Dynojet isn't accurate; Mustang dyno isn't accurate; then what is?

 

dynos supposedly have to be serviced every now and then but even if i think you should only use the same one to measure improvements.

just run a baseline on your car and add a set of parts and run again. then again and again until your happy with the results.

 

Your height above sea level ought not matter. Only the barometric pressure, which is a correction factor fed into the dyno software. One of the Dezod or ZPI guys (can't remember who exactly) had a great forum post about the difficulty of dyno techniques. Under-drive pulleys OUGHT NOT make a difference in measured power, but they do on Dynojets and others that use the basic principle of F=MA. Figuring out changes in "F" by measuring the derivative of "A" has its issues. However, I say if that's all you've got handy, it's better (and more fun) than nothing. :-D