My :icon23: dyno reads really high.

^ +1. theDreamer just did a DD baseline at 243rwhp on a 6MT car. I know that sounds low, but (a) this is DD, which reads lower than most, and (b) even among the same mfg, every Dyno is set up a little different, and runs in different conditions, etc. Apparently EngineLogics is our local super-heartbreaker. It's kinda nice knowing that your numbers can't possibly be interpreted as inflated though :)

You know removing the a/c frees up HP.

What I am interested in, then, is how gains are going to compare across dynos. I'm going to go back after I install my Injen intakes, which Injen claims gains 15whp. Their test was on a DynoJet and the gain amounted for about a 5.3% gain with a 279whp baseline.

If I baseline at 243 whp, I wonder if I could use that 5.3% and estimate a gain of 12whp. I think there are too many variables so I doubt I can do a linear comparison but it will be interesting to see what comes of it.

Am really looking forward to your dyno with the intakes... am waiting to pull the trigger on the Injen but would like some more real world numbers.

I will post up a detailed thread. Install pics, dyno vids, and all. I should have the intakes next week and will install them over the weekend. I'm planning to drive the car for a week before a dyno just to give everything time to adjust.

I would recomend doing a baseline dyno first, then do one with mods. This is the only way to truly know what gains you are getting

That's what I'm doing. Baseline tomorrow, dyno after intakes in 2 weeks, and then again after FI CBE. :hello:

And of course the baseline dyno and subsequent dynos must be performed on the same machine. Otherwise it's totally pointless.

Gentlemen... I am not a noob. :icon18::driving:

Sigh. Different dyno's read different numbers - ESPECIALLY if a load is put onto it! A Mustang or Dyno-Dynamics dyno will generally read low. Altered Atmosphere's dyno is a Dynojet dyno, which doesnt put a load on the motor. They always read higher than others. I will put money that the OP's dyno was a dyno of the type that puts a load on the driveline.

And that would be an excellent bet. 258whp is exactly what our bone stock 370Z made on our Dyno Dynamics. :)

http://www.injectedperformance.com/h...-258whp+tq.jpg

[YOUTUBEHQ]X8iLCR-Yqo8[/YOUTUBEHQ]

Well Hell
 

So basically most of you agree that not one dyno is accurate. One thread said " A normal dyno" which to me sounds a little broad. How about this I will go to three different dyno shops and pay three times what I want to pay and take the average. I do believe that most dyno shops have to have their machines calibrated by the state of some sort to charge customers money and be considered a business.

The best thing you can do is pick a shop/dyno and stick with it for the life of the car. I did my baseline with a dyno dynamics at a certain shop and will be going whenever I feel I need to re-dyno my car after an upgrade or need a tune from them.

All dynos are accurate on their own scale, as long as they are well maintained (ours is). Even car manufacturers can't always agree on what to accurately rate engine power at. What you also have to consider is the formulas behind each dyno and how the numbers are determined. It is a fairly complicated process that takes in a scary amount of values to determine what numbers to output on the screen. As a previous poster pointed out, some dynos are load bearing; others are not. Some, like a Dynapack, measure from the hubs rather than the mounted wheels and tires.

There is no such thing as a "normal" dyno or a right vs. wrong dyno. We have our reasons for choosing a Dyno Dynamics over the other choices, but that does not mean that we feel DynoJet numbers are irrelevant. They are simply using a different scale than ours. The important thing is that you remain consistent on the brand of dyno that you go to. A DD's numbers will be comparable to just about any other DD's numbers, but directly comparing a DD result to a DynoJet gets a little more fuzzy. The only *true* way to measure horsepower output is through an engine dyno, not a chassis dyno. All we can realistically do is measure gains from our baseline on X dyno to the results on the same type of dyno.