Nimir Qatar

What is the equivalent reading on a dynojet for a 420 rwhp on a dynodynamics reading?

_AMG_

Dont really know.
But I do know that Dyno Dynamics (heartbreak dyno) is notorious for reading low.

Nimir Qatar

Yeah, thats what I heard. I never dynoed on a dyndynamics. I have a friend with a solid C63 and I was surprised when he told me that he only made 420 at the wheels, but then he mentioned this dynodynamics and how it dynos less. I hope someone can answer me

Jae Duk

What do you mean by "solid"? 420 to the wheels for a stock C63 is high. I don't remember what I dynoed on DD but it was really low, but if you use the avg of 20% loss it should be around 390ish

Nimir Qatar

It is not stock. I never said it was stock. It got an ECU tune+ Headers+ Air filter+ X pipe. It is also a fast C63, It murders the stock C63

_AMG_

My car dynoed at 356hp on Dyno Dynamics with 2ndary cat delete and no tune. Maybe this would be a good reference to compare with the Dynojet.

Nimir Qatar

Thank you. That is good information. How much would you normally gain on avarage for a scondary cat deleate?

MB_Forever

This question is, unfortunately, very hard to answer. In general, Dyno Dynamics machines read about 10% to 12% lower than Dyno Jet machines. However, the operator can add a correction factor in Dyno Dynamics to make the numbers read like a Dyno Jet. Some shops choose to add a 10% correction factor, others choose to add 15% while others add 12%. So as you can see, the numbers vary greatly. I can make a dyno read whatever I want. For instance, I have dynoed my car at a Mustang Dyno, which is also known as a heart-breaker dyno, and the car showed 503 rwhp at 100% stock I wish that was the case, but we both know that is impossible

Dyno numbers work best if you compare mods before and after installation. You dyno the car before you install a particular mod and then dyno it again (at the same place on the same dyno) after you install the mod in question. This would give you a nice comparison of how much power that specific mod contributed.

khmergod

Nice car OP, my dream car.

_AMG_

No problem.
2ndary cat delete would probably make around 10-15hp (this is just a ballpark estimate).

reggid

The only dyno dynamics worth using if you are doing any sort of comparison with other dynos is shootout mode because that locks in correction factors so the operator can not really fudge the numbers. You can infact still fudge the numbers via temp probe placement so it reads hotter than what the engine actually sees which can inflate a few % but this is visible on the printout. You can also play around with the strap down so the car comes off one of the rollers, again this is not a huge difference but i am sure there are people using this to make themself feel better. When you use shootout mode it is printed on the graph and if it does not say shootout the operator can add any correction factor he likes. 4WD dyno dynamics tend to read lower than 2wd variants. In shootout mode the difference between dyno dynamics and dynojet is typically not the 15% floating around i believe thats why shootout mode is used so that it is more inline with other types of dynos, well that and trying to eliminate fudge factors.

darmawaa

Dyno dynamics#:
Stock 2010 C63 dynoed 311 whp
Stock 2010 E63 dynoed 363 whp

Jae Duk

Actually that looks about right for C63. I think I dynoed ~320ish on DD before I got my tune.

_AMG_

311WHP on a C63?? How many miles did the car have?
I got 356whp baseline on DynoDynamics.

darmawaa

I don't know, that was my friend's , he just getting the baseline.
Recently after tune & remove the cat & resonator, he get 369 whp
Our dyno reads very low, around 30% less than crank (100 hp engine would read 70 whp)
Maybe the alternator/motor has worn out or need calibration.
Anyway we just use the dyno to get "before & after" comparison.

audifreak

I got dynoed at 352PS using dyno dynamics.
It was a total stock C63 PP Plus. The dyno guy said he could only use up the 4th gear cause of some settings...does it make a difference?
Was kind of disappointed with the results, but is this the correct range using dyno dynamics? thks.

MB_Forever

352 PS (metric hp) is equal to 347 hp, which is pretty decent for dyno dynamics. If you add the 12% correction factor, your car would dyno right around 389 hp on a dynojet

audifreak

Correct me if I am wrong.
The specs says that the PPP has 487hp. So with a drivetrain loss of 20%, it has around 389whp?
thks.

MB_Forever

The specs say that the PPP has 487 PS (metric hp) which is equivalent to 481 bhp (ratings we use here in the US). Now the actual drivetrain loss percentage is hard to determine, but in general, many aftermarket companies (at least here in the U.S.) seem to accept/use the loss percentage amount of 18% to 20%. So in your case, 481 bhp - 19% would yield 389 whp. Also, please don't forget that on the dyno the numbers will vary a little depending on weather conditions, elevation, strength of the dyno fans, exhaust fans, cooling between runs, error margins, etc... so don't expect exact numbers, as it won't be realistic.

G_Donnelly

I Just ran my 2012 C63 Coupe last night on a Dyno Dynamics, my car is completely stock, I haven't done a thing to it. She pulled to 389.9 at the wheel. It's always run really quick, I'm very happy with the results and hoping to learn more about how I should begin modding it.