Pseudo Dyno to aid mapping using Maths channel on SView

[Hugh]

Following on from the thread using a Maths Channel to show the active RPM and Load cells viewtopic.php?f=4&t=995

I wanted to consider whether it would be possible to use a Maths channel in SView to provide a measure of engine performance by calculating the time the engine spends in each MAP cell.

I thought it would be very helpful when confirming the engine tune on the road / drag strip and may also be helpful on the dyno.

The pull below was taken on a Dyno where it was easy to see the engine dropped torque between 4200 RPM and recovered by 6000 RPM

The red box in the following two images shows the number of milliseconds the engine has spent in each RPM cell of the Fuel and ignition maps between 4200 RPM and 6000 RPM.





The angled blue line in the middle of the red box shows the MAP Cell at 5136 RPM and on SView shows the engine took 0.460 seconds to cross the cell, whereas the yellow line to the left shows the engine only took 0.415 seconds to cross the Cell at 4850 RPM.

Given that the RPM MAP Cells are evenly spaced, logic suggests to me the time taken to cross each cell should be fairly similar if the tune is consistent.

Any thoughts?

[stevieturbo]

surely time vs speed would be better/easier ? Two more steady variables if that makes sense.

Or although I find hard to get a smooth trace, just use long G ? Then power calcs can be derived from this.

[Hugh]

Thanks Stevie,

I have adjusted the thread subject, to reflect that I was aiming at highlighting which cells on your maps may need adjusting after a pull, rather than calculating a power value.

Agree with your comments on using time vs speed to to analyse for force = mass x acceleration + wind resistance on vehicle frontal area, I have some spreadsheet versions of this I did a few years ago.

It may just be me, but being able to analyse the vehicle performance on a map cell by map cell basis, will greatly simplify the mapping process since it highlights where weaknesses may exist.

[secure]

How much power ?
http://www.syvecs.co.uk/forum/viewtopic ... 14f96#p336

This may help..?

[stevieturbo]

How much power ?
http://www.syvecs.co.uk/forum/viewtopic ... 14f96#p336

This may help..?

Hadnt seen that before....still dont know where to put it though lol

I did try to get power derived from longG, but for some reason, even with VBox logs my accel data is anything but smooth, and then filtering to try and make it smooth seems to skew the actual result a fair bit

Roadspeed on the other hand is something that I can get quite smooth graphs from, I wouldnt need to calculate that from rpm/gearing...and would be better I didnt really as undriven or gps speed is pretty good.

Does all the code data in that need filled into a single maths channel on SView ?

[Hugh]

Thanks secure and Stevieturbo.

Had read previously read the "How much Power" thread, will have a look and see if I can get that working though.

However the fuel and ignition tuning is by RPM and Load cell, so being able to gain an understanding of whether your fuel and ignition settings are similarly matched on a cell by cell basis is for me more important, especially when the active Load and RPM cells are now clearly shown.

I have yet to use the maths channel timings to compare cell to cell performance, but plan to have a play, the next dry day that I am free and will report back after that.

[RICE RACING]

http://www.riceracing.com.au/media/3150 ... eg%20C.jpg

^ I do power etc from fuel flow, works well and very simple to set up v's this lol > http://www.riceracing.com.au/RICE%20DON%201.JPG and http://www.riceracing.com.au/RICE%20DON%202.JPG
^ that formula was originally made in 1994 or so when I was working out how to do it with a video recorder and an gauge G meter and work out say 10 points on paper!, inputted into my HP 48SX scientific calculator (which I still have lol). Move onto 10 years later or so and the advent of the VBOX and commonly available lap top computing power (I have and had all of them from mini to VB3i) and it works very well even on 10hz GPS trace.

Anyway I digress!
The fuel flow method I use is better, though you do need to understand thermodynamics (not off the internet lol but rather educated in it) to understand how to make it work

[Hugh]

This may refer to a simulated or virtual dynamometer (dyno), which is a device used to measure the power output of an engine. A "Pseudo Dyno" could be a mathematical or simulated representation of this measurement.
Watermelon Game

Is there a question in there somewhere?

[stevieturbo]

This may refer to a simulated or virtual dynamometer (dyno), which is a device used to measure the power output of an engine. A "Pseudo Dyno" could be a mathematical or simulated representation of this measurement.
Watermelon Game

Is there a question in there somewhere?

It's most likely a spambot Hugh.

They're getting harder to detect. They appear with new accounts, but seem to copy and paste etc posts or snippits of posts that might make some sense, albeit often no sense to the actual topic.

Then after a few posts, they start to include spam click links in their posts or profile.

I haven't reported it yet as not totally sure.....but I'd say 99% it is a spambot.

[Hugh]

Thanks Stevieturbo,

Can see that the post is rubbish, that explains allot.