I would say the REAL number is the one that came from a REAL dyno, which is the Mustang.

But Mustangs can be all over the place sometimes. Theres ones that read low and ones that read as high as a DJ.

As for a Dynojet, there all seem to read very similar.

If you want a higher REAL number, then go dyno on a Dynojet.

Or better yet, hit the track and get some ETs/Traps.

 

Either DLL a Dyno or whatever is just a tool to measure before/after. They could read in in the millions of whp and it still wouldnt matter because your only using it as a tool. I always like to think Dynojet #'s have a meaning behind them though because you cant really change them and they all read the same. But this isn't a dyno compare thread.. I'm actually trying to find JB's that got closed so I can find something lol.

 

to compare a Mustang Dyno and a Dynojet the USUAL difference is around 15%, so a 400 awhp car on a mustang dyno will translate to 460 awhp on a dynojet, a 500 awhp car on a mustang will translate to 575 awhp. Simple math, your mustang dyno number multiplied by 1.15. My car dynoed here in louisville at a mustang dyno at 478 awhp, and on AMS's dynojet it made 547 awhp. Now take the 478 multiply it by 1.15 and you get 549.7, which is 2.7 whp off from the formula. Now you will however have the people who will play with correction factor and stuff like that to show non-existant gains, but that's a whole other story. I simply HATE DLL numbers as they are pretty much estimates, I have personally seen too many cases like the one above of 100+ hp loses when being tuned on a DLL and a REAL dyno. But have seen some that are pretty close. If you want a good comparison stay on the same dyno throughout your entire build and then you can really tell what is going on. In my opinion a DLL dyno is no different than one of those apps you can download on a iPhone or one of the g-tech informeter. One of the magazines recently did a dyno comparison between a mustang, dyno dynamics, dynapack, and dynojet. The dynojet read the highest, followed by the dyno dynamics, then fell off about 25-30 whp to the dynapack, and the lowest was the mustang. The test vehicle was a 2006 evo.

 

I think that Boosted Tuning hit it right on the spot! thanks man. I agree that DLL is NOT accurate especially through my experience! I hope somebody else could learn from this thread. thanks myevo8you for the info as well

 

+1

 

I dont know if I would say DLL is NOT accurate. I think a dyno is just a tuning tool and only as good as the operator.

Also, I think boostedwrx hit the nail on the head, ALL and ANY dyno is just a tuning tool. The only thing that matters is the BEFORE and AFTER on the SAME DYNO.

 

before i got retuned, i made like 495 on kevins dll and then i got on steve kans mustang dyno and made 445. thats like a 50 whp diffence but i still pull 500whp +cobras

 

the drag strip doesnt lie.

 

I found this on awdpirates where it shows the different dyno's in Colorado and how they compare on the same vehicle. Pretty cool and his differences in percent match mine pretty close.

 

Buf if the #s are not accurate representations of the actual whp a car is putting down, it really doesn't matter about the before and after #s. I still believe that there is the ability to accurate record the whp of a vehicle. A dynojet and mustang can't be both correct. Though both could be wrong in measuring the true whp.

 

Cuz in theory, NO ONE knows exact true HP.

Theres dynojet HP, mustang HP, DLL HP & HP estimated from ET & trap.

Which one is TRUE HP?? Really it doesnt matter. They are all just measuring devices. As long as you use the same one and see gain, then your good to go.

Its actually ALL about before and after #'s

 

The biggest issue is that, aside from bragging rights, the numbers specifically mean nothing. They are arbitrary. The important part is to know how they are changing and how the car runs. I understand for the desire to be accurate but in this case it just doesn't matter. I would pick whichever one you like best, call that accurate, and use it and it alone to tune your car. Outside of that pick the one makes you feel all warm and fuzzy on the inside.

 

As others have said a dyno is just a tuning tool. To many factors will change your numbers. As long as you are using the same tool to measure the change I see that as the most important.
Did you race your brother before you installed your cams? Was there a difference in the most recent race?

I think dyno numbers are more for bragging rights anymore than anything else.

 

I still don't buy the first argument. The reason no one wants to get to the bottom of it is due to competing dyno systems. If you find out that X dyno system produces the correct whp, then all other dyno systems would fail an nobody would use them. There is a lot of money at stake. Not like these dyno's are cheap.

To your 2nd point, true WHP does matter. If you can accurately(correctly) measure whp, you can accurately determine what the car should run in the 1/4 mile over and over. The reason is that weight is already accurately determined. That way when the car comes off the dyno, you can say with certainty that this car will run X in the 1/4 mile, not low 10s or high 11s.

I also will respectfully disagree with your last statement as well. Before and afters as it stands now are not what it's about. If the instruments used are flawed, manipulated, or incorrectly used, you have no real basis for how your car performed before or after. You could be 100whp off.

 

Where are u Mr STOCK ECU ?
Come on Mellon NO advice ? No comment ? :/