Im going to call the dyno manufacturer and ask what number have to be input to get an accurate torque figure, thats a start, then ill go and see if they can be input post run.

Dann

 

I'm not so caught up in the right or wrong on this... I am caught up on why a dyno operator wouldn't care about tq. Did he win it @ a county fair?

 

You literally asked this on yourself. In the name of "learning new things" remember?

 

its a shitty dyno
1.6 is slow to spool an ancient Garrett

/thread

in4 efr

 

because it can be back calculated by HP if you care about it?

Torque doesnt accelerate the car, torque is a static measurement that doesnt do any mork and doesnt make the car perform, the HP that the torque helps produce along with the RPM does all of those things we build cars for.

Thats how I feel about it, Im assuming the dyno op feels the same?

18
Its excellent, Im thoroughly enjoying it, hopefully we all learn a little about dyno's.

Dann

 

that is the exact opposite of the truth.

 

 

After all of that power goes through the drivetrain it is, but not at the flywheel.

Dann

 

I was unaware that your dyno was measuring power at the flywheel, somehow.

 

Drink a cup of coffee.

Then come back to this thread.

 

I wasn't accusing you of faking anything.

However, the record you are quasi trying for is definitely fake. You said it yourself that you don't actually care about the record, only that you made the title that way to draw attention to your thread (if I remember correctly).

I'm also not blaming you for the shitty dyno logs, as far as I can tell it wasn't your fault, just the lazy dyno operator/owner.

I do blame you for not liking my cookie comments...

Bottom line - is the thing faster around the track and is the owner happy with it?

 

Lol.
Horsepower does the work, if it didnt then we would all be driving cars that made 1000ftlb at 100 rpm instead of 200ftlb at 6000rpm.

Dann

 

The owner is stoked, he drove it yesterday for the first time.
He says it is tamer at street RPM and is much quicker through the mid and top.

Hasnt been to the road course yet.

And the record is BS anyway of course, however Id like to find an accurate way to measure performance for the sake of being sure its as efficient as I hope it is.

Otherwise how do you learn?

Dann

 

we do

they're called diesels

 

[Edit: Ignore this. I opened the post, got busy, hit send but 100 people had posted in the meantime.]

Dear 8 pounds 6 ounces... new born infant jesus. jimj is just saying there is probably an error on the output / display of the torque.

Sheesh.

Dann - Get a proper output. You are making life harder for everyone involved.

 

OR go do a dynojet.

 

Torque at the dyno drum.

US dynos calculate torque from power

Aussie measure torque in the dyno, called roller torque and power calculated from roller rpm and torque.

Tractive effort=motive force

Those were my basic notes while on the phone to the guy who runs mainline dyno's just now, lucky he was there its only 8:30am here.
he was actually logged into my local operators dyno when i called performing an update. he can access and print the sheets from there, he will email me, and have the local shops machine print a sheet waiting for me when I get there.

Basically the torque is the torque at the drum, engine torque multiplied by the diff ratio divided by the tire size.

He will email me, and I will get printed a sheet that shows engine torque, which apparently is just done by clicking a check box and thats it.

Apparently US dynos like dyno jets often calculate torque from power, where as this dyno and most common aussie setups measure torque at the drum, and speed of the drum to calculate power.
With a tach signal, clicking that box allows the dyno to output in the torque you guys are expecting to see.

Easy.

Ill have it up by this arvo.

Dann

 

HP and TQ always cross at 5252 RPM because:

...if you multiply torque (in pound-feet) by engine speed (in RPM) and divide the product by 5,252, RPM is converted to "radians per second" and you can get from torque to horsepower...

From: HowStuffWorks "How do you convert engine torque to horsepower?"

 

We dont measure torque from power in the US, thats just the way the cheaper dynojets do it, and its total ****. Its also why they are useless for tuning. I shudder to imagine how many engines have blown up as the result of tuning for power on dynojets.
Also, inertia dynoes (like a dynojet) typically make HIGHER numbers, not lower.
Making more power on a proper, load-holding, dyno than on an inertia dyno means that you have some crazy optimistic dyno, or youve fucked with the numbers.

I already take dynojet numbers with a grain of salt. More optimistic than that is just insane.

 

Here you go.

Whinge about this one. So did I win or what?

someone please post detailed ibstructiona on how to use ms2 to data log the right info for VD. Please.

Dann