Any way to derive peak whp and wtq based on datalogs?

[brandonGT]

well ive been reading alot of threads about owners getting stage 2 protunes and posting their dyno numbers and ive been quite jealous to be honest.

 

i dont have a AWD dynamometer anywhere close to me and im certainly not going to drive a few hours just to pay 100$ to get my car dynoed. but still, i am very curious to see how much power my cars has with the mods i have added.

 

so my question is there anyway to get whp and wtq from datalogs even if they are just rough estimates? it would be nice to get a ballpark figure as i havve no clue what im running right now

[SubLo]

well ive been reading alot of threads about owners getting stage 2 protunes and posting their dyno numbers and ive been quite jealous to be honest.

 

i dont have a AWD dynamometer anywhere close to me and im certainly not going to drive a few hours just to pay 100$ to get my car dynoed. but still, i am very curious to see how much power my cars has with the mods i have added.

 

so my question is there anyway to get whp and wtq from datalogs even if they are just rough estimates? it would be nice to get a ballpark figure as i havve no clue what im running right now

 

This is very, very easy to calculate only if you know your exact weight and E.T. Once you have TQ, you can extrapolate HP. It can be done with a laptop yes or even pen and paper. Or, you could just buy a GTechPro.

[brandonGT]

This is very, very easy to calculate only if you know your exact weight and E.T. Once you have TQ, you can extrapolate HP. It can be done with a laptop yes or even pen and paper. Or, you could just buy a GTechPro.

 

very true. those things run for about 100$ right?

 

i was so excited when i heard cobb was coming out with a virtual dyno update for their AP but it doesnt work for auto's

[mickeyd2005]

We incorporated a road dyno into Airboy's spreadsheet quite a while ago.

 

http://www.romraider.com/forum/topic957.html

 

Just log rpm in 3rd gear if you have a 5MT. If you have a 5EAT, you will need to log RPM and MPH. You need to hit WOT at 2000 rpm and do not let go of the throttle until redline. You need all the data.

 

The math is the same as any inertia based dynamometer.

 

Dynos are tuning tools. It doesn't matter if your mass is off. You just use it to compare changes in your tune. The important thing is to use the same road and similar environmental conditions.

 

Dynos also derive torque and horsepower from measured parameters. Haven't you noticed that all dynos seem to read differently.

[SubLo]

We incorporated a road dyno into Airboy's spreadsheet quite a while ago.

 

http://www.romraider.com/forum/topic957.html

 

Just log rpm in 3rd gear if you have a 5MT. If you have a 5EAT, you will need to log RPM and MPH. You need to hit WOT at 2000 rpm and do not let go of the throttle until redline. You need all the data.

 

The math is the same as any inertia based dynamometer.

 

Dynos are tuning tools. It doesn't matter if your mass is off. You just use it to compare changes in your tune. The important thing is to use the same road and similar environmental conditions.

 

Dynos also derive torque and horsepower from measured parameters. Haven't you noticed that all dynos seem to read differently.

 

+1 to all of this except... torque is not derived. It is a turning moment and measured. HP is a function of that measurement over time.

 

Ehh... semantics...

[mickeyd2005]

+1 to all of this except... torque is not derived. It is a turning moment and measured. HP is a function of that measurement over time.

 

Ehh... semantics...

 

No. Torque is derived.

 

Do you know how a dynojet works? It derives torque from the acceleration of a known inertia (2 drums). It can't measure torque so it measures acceleration of the drums and derives the torque.

 

Some dynos measure energy absorbed and derive power from that value and then back out torque.

 

Bench dynos measure torque using a strain gaged and calibrated torque link but most AWD chassis dynos can't do this.

[brandonGT]

We incorporated a road dyno into Airboy's spreadsheet quite a while ago.

 

http://www.romraider.com/forum/topic957.html

 

Just log rpm in 3rd gear if you have a 5MT. If you have a 5EAT, you will need to log RPM and MPH. You need to hit WOT at 2000 rpm and do not let go of the throttle until redline. You need all the data.

 

The math is the same as any inertia based dynamometer.

 

Dynos are tuning tools. It doesn't matter if your mass is off. You just use it to compare changes in your tune. The important thing is to use the same road and similar environmental conditions.

 

Dynos also derive torque and horsepower from measured parameters. Haven't you noticed that all dynos seem to read differently.

 

ok ive spent the past 30 min trying to do this but i dont get it at all

[SubLo]

No. Torque is derived.

 

Do you know how a dynojet works? It derives torque from the acceleration of a known inertia (2 drums). It can't measure torque so it measures acceleration of the drums and derives the torque.

 

Some dynos measure energy absorbed and derive power from that value and then back out torque.

 

Bench dynos measure torque using a strain gaged and calibrated torque link but most AWD chassis dynos can't do this.

 

No I don't know how a dynojet works. I have no experience with them whatsoever. Perhaps the dynojet specifically does derive it per your description. From a mechanical engineering perspective, it may be calculating that from as the effectsof deflection. Simplistically, it is indeed easily measured.

[mickeyd2005]

No I don't know how a dynojet works. I have no experience with them whatsoever. Perhaps the dynojet specifically does derive it per your description. From a mechanical engineering perspective, it may be calculating that from as the effectsof deflection. Simplistically, it is indeed easily measured.

 

Torque is not measured. Torque is derived. I don't understand why you don't just look up how a dynojet works.

 

An inertia dynamometer (such as DynoJet) does not measure torque, but measures acceleration.

 

http://www.msprotege.com/forum/archive/index.php/t-123629978.html

 

As I said before, the bench dynos do measure torque using a calibrated link. The road dyno spreadsheet uses the same mathematical principle as a dynojet.

[SubLo]

Torque is not measured. Torque is derived. I don't understand why you don't just look up how a dynojet works.

 

 

 

http://www.msprotege.com/forum/archive/index.php/t-123629978.html

 

As I said before, the bench dynos do measure torque using a calibrated link. The road dyno spreadsheet uses the same mathematical principle as a dynojet.

 

I did look it up and that post is very informative. In your Dynojet case, as I said previously, you're right - they're calculating power from the acceleration of a known rotating mass and solving/deriving torque it seems. However, torque can indeed be measured very simply. It's a very simple force.

[boostsr20]

We incorporated a road dyno into Airboy's spreadsheet quite a while ago.

 

http://www.romraider.com/forum/topic957.html

 

Just log rpm in 3rd gear if you have a 5MT. If you have a 5EAT, you will need to log RPM and MPH. You need to hit WOT at 2000 rpm and do not let go of the throttle until redline. You need all the data.

 

The math is the same as any inertia based dynamometer.

 

Dynos are tuning tools. It doesn't matter if your mass is off. You just use it to compare changes in your tune. The important thing is to use the same road and similar environmental conditions.

 

Dynos also derive torque and horsepower from measured parameters. Haven't you noticed that all dynos seem to read differently.

 

Don't know what I'm doing wrong but I can't get this to work for me...