RPM/s²

[Yves]

Is there a possibility to add an rpm/s² in MLV ?

[jsmcortina]

You can add a calculated field to do that in the registered version.

James

[piledriver]

What time scale is RPMdot??

[jsmcortina]

Change in RPM per second.

James

[piledriver]

Thought so, so he already has almost what he needs.

[Yves]

so rpmdot is rpm/s² ((rpm/s)/s) ? Thanks

[jsmcortina]

No. RPMdot is dRPM/dt. You are after the next derivative.

James

[nathanhardy]

Yes what are you up to here? You always come up with cool things!

[Yves]

I'm working on a way to make a meaningful calculation of power or torque produced and compare it to changes in ignition timing. Then display them in MLV with scatterplots.

Lots of work and lots of things involved.

Last plot I made gave some info based on which I adjusted my timing tables. Still have to test it to see if it did have an effect.

But I got sidetracked (as always) with the install of the IOX (accelerometer, 8 O2's, oil temp and....). Results calculated vs actually measured should be even more correct.

[jsmcortina]

What were you planning on using rate of change of acceleration for?

James

[Yves]

Calculate torque produced.

[jsmcortina]

You need acceleration for that, not rate of change of acceleration - surely?

James

[Yves]

You need acceleration for that, not rate of change of acceleration - surely?

James

It's similar to what happens on a dyno when you accelerate an engine based on a fixed load and the time it needs to go from say 2000 rpm to 6000 rpm in a sweep test.

The faster it can get from one point to the other with the load of the car working against the engine the stronger the engine.

[jsmcortina]

It's similar to what happens on a dyno when you accelerate an engine based on a fixed load and the time it needs to go from say 2000 rpm to 6000 rpm in a sweep test.

The faster it can get from one point to the other with the load of the car working against the engine the stronger the engine.

That's acceleration, not rate of change of acceleration.

i.e. RPM/sec not RPM/sec/sec

James

[Yves]

We are talking about angular accelaration are we ?

Rpm is a bit of a misnomer as you are calculating based on rotations per second...

[jsmcortina]

Yes, the first derivative of engine speed. You have been asking about the second derivative which I don't understand.

James

[piledriver]

Torque (and thus HP) are already available gauge/calcs in TS and MLV.

I have considered setting up another manually switchable ignition map with more or less timing and toggling back and forth to log changes. Would be neat to be able to automate that and have it pick the better value like VEAL for ignition timing...
With a knock module and reasonable limits it wouldn't have to be unsafe.

[Yves]

If only what those give as results would be real world numbers I would agree.

At a given point I was making a comparison based on the amount of fuel injected with the theoretical value of BSFC to see what the possible HP/TQ number would be and the would vary enormously.

[Laminar]

Torque (and thus HP) are already available gauge/calcs in TS and MLV.

Yves has had trouble with TS's calculated variables:

http://www.msextra.com/forums/viewtopic ... 22&t=61129

I asked for a screenshot of his power dialog box several times but never saw one.

[Yves]

Torque (and thus HP) are already available gauge/calcs in TS and MLV.

Yves has had trouble with TS's calculated variables:

http://www.msextra.com/forums/viewtopic ... 22&t=61129

I asked for a screenshot of his power dialog box several times but never saw one.

What does a screen out of TS say about the calculations ? There is only so much you can see on that.