Torque x RPM / 5252 = Fake Chart?

[Nadzree]

I know that TQ and HP must meet at 5252rpm.
Why is that in some charts they don't?

Fake charts?

Some are acceptable because of the scale lari a bit but a lot lari habis..
Any explanation for this? Thanks

 

[^pomen_GTR^]

i dont think all hp and torque MUST meet at 5252rpm.....

and i think your understanding on it was a bit skewed...


i'm no expert in explaining...so maybe others can help explain this properly...

 

[Zzeenn]

from my understanding Torque and HP will from dyno will always cross at 5252 rpm provided that:
1. torque unit is in pound-force-feet (ft-lbs) not Nm
2. both hp and torque in the same scale; like the pic above both tops at 190

why dont you post some questionable chart for discussion

 

[Nadzree]

i dont think all hp and torque MUST meet at 5252rpm.....

and i think your understanding on it was a bit skewed...


i'm no expert in explaining...so maybe others can help explain this properly...

I think it must meet at 5252..that's how the equation works

---------- Post added at 10:44 AM ---------- 6 hour anti-bump limit - Previous post was at 10:38 AM ----------

from my understanding Torque and HP will from dyno will always cross at 5252 rpm provided that:
1. torque unit is in pound-force-feet (ft-lbs) not Nm
2. both hp and torque in the same scale; like the pic above both tops at 190

why dont you post some questionable chart for discussion

Owh..thanks for the info..Im Malaysia we use matrix so KG-m for torque.. So it wont meet at 5252?

---------- Post added at 10:55 AM ---------- 6 hour anti-bump limit - Previous post was at 10:44 AM ----------

And i found that if using Nm the torque anf HP will meet at 7023.5 rather than 5252 if using lbs.
Thus probably we can use this to determine the accuracy of the dyno machine.

This explain why our graph is different from others in Europe. :)

 

[kariayam]

I've read how they derive the EQUATION: Torque*N/5252 = Power.

5252 is just only a constant value which is not to be confused with anything including meet the point.

The 5252 appears when N(Rotational speed)unit is in RPM(rev/min). U will see numbers other than 5252 IN THE SAME EQUATION if other unit is used ( radian/sec)

Also Torque should be in Lbs.ft and not in kg.m or N.m
Power in kW not HP

The main key is u should be able to convert every parameters u have in the right unit before using the equations..Good Luck!!

 

[Chinoz]

The constant 5252 only applies if your scales are similar and units used are hp for power (approx 1 kW = 1.34 hp) and lb-ft for torque.

If using kW and Nm, the constant should be about 9549 (equivalent to 60000 / 2*pi).

It's basically a play on the formula P = Tw.

Powertrain performance test Information - Rototest Research Institute
Scroll down to "TORQUE, SPEED AND POWER" for quick references to the approximations.

 

[kariayam]

The constant 5252 only applies if your scales are similar and units used are hp for power (approx 1 kW = 1.34 hp) and lb-ft for torque.

If using kW and Nm, the constant should be about 9549 (equivalent to 60000 / 2*pi).

It's basically a play on the formula P = Tw.

Powertrain performance test Information - Rototest Research Institute
Scroll down to "TORQUE, SPEED AND POWER" for quick references to the approximations.[/QUOT


Yeah, U got it exactly right and well expalained dude.

The original equation was P= T.w

The constant numbers appear whenever any of the parameter units other than Lbs.ft,hp,and rad/s are to be used.