A new feature has been added to DeltaDash. This allows on road dyno testing of 99MY onwards Subarus. Anyone who already has the product can download this update for free from the downloads section ecutek web site:

http://www.ecutek.com/downloads/DeltaDashBeta.zip

Others can also download this new version for free to view dyno runs from other people's cars.

The tests are impressively accurate. I had my car tested on the rollers last week. It achieved 227 wheel horse power. On the road, DeltaDash calculated wheel figures of 222 & 233 BHP for 2nd & 3rd gear respectively.

This version is a Beta, so please post any comments that you have.

Cheers

Steve

http://www.ecutek.com/developments/dyno3.png
http://www.ecutek.com/developments/dyno1.png
http://www.ecutek.com/developments/dyno2.png

[Edited by StephenDone - 1/29/2003 1:19:42 PM]

Great Stephen, I didn't try the new DD version yet but from what you say I think it will be fantastic!
Cheers
JIM

Damn - anyone want to buy an AP22?! :)

Thanks Steve!
Richard

:cool:

How's it work then?, do you just plug in and log and it give BHP figures? Can it read torque?

Is tha sample log supposed to be a .ddf format? DeltaDash only knows about .csv's :)

Richard

You open the sample log from the 'Road Dyno' window.
Click the 'Open Data File...' button in the lower left corner of the 'Data Analysis' tab.

I'm going to try this tonight, to se if my car delivers as much power as Subaru promises :)

-Torstein

Stephen,

With a little work you can extend DD to measure transmission losses too, you would need to log a coast-down run in the same gear.

Paul

Thanks Torstein, just spoke with Steve and know the error of my ways :)

It looks very good.

Richard

Here's the clickable version

http://www.ecutek.com/downloads/DeltaDashBeta.zip

Put a little bit more effort into your posts guys ;)

>How's it work then?, do you just plug in and log and
>it give BHP figures? Can it read torque?
>
It measures the car's acceleration and calculates the power required, based on the car's mass and aerodynamic drag.

>With a little work you can extend DD to measure transmission
>losses too, you would need to log a coast-down run in the
>same gear
>
Yes, it is a very simple calculation.
I've considered this, but have decided not to implement the feature. All calculations are done on RPM values of the engine, which are very accurate. Once you disengage the gearbox, RPM no longer corresponds to vehicle speed. Standard vehicle speed diagnostic data is very slow to update and pretty inaccurate, so I don't want to use that. I prefer that people can compare the figures that the software produces with confidence that they are very close to the truth. Plus, real world, useable power is wheel power, so we'll stick with that for the timebeing.

btw, it would be useful if people could post the weights of their cars. This is required for accurate power calcs.

My 99MY UK Turbo with a full tank of fuel weighs 1300kg. So that's 1370kg with a driver.

A 2002 WRX weighs around 150kg more, so that'd be around 1520kg, though it would be nice if someone has had theirs weighed.

You can download an example run from my car here:

http://www.ecutek.com/downloads/DynoRun3rdGear.DDF

Cheers

Steve


[Edited by StephenDone - 1/29/2003 1:08:50 PM]

555kb zip file?

Spooky, huh? ;)

Hi,

Is the setup for the JDM STi-7 the same ? Do I select UK STI-7 pr STI-7 from the drop down menu ?

What is the weight without passenger for a JDM STi-7 ?

Cheers,
Ray

PS: This is a pretty awesome tool :)

Road Dyno is great. Got 290 bhp and 280 lbft before third gear let go. Was hoping for 300 at the wheels too since 4th gear runs an extra 1 PSI at peak power :D

[Edited by john banks - 1/29/2003 2:51:15 PM]

300 bhp at the wheels ?? do you mean at the flywheel ?

Cheers,
Ray

PS: Anyone know the answer to my questions above.

My euro MY99 only weighs 1250kg with full tank!!!


Skassa

>My euro MY99 only weighs 1250kg with full tank!!!
>
Thanks Skassa.
Ahhh. That'll be my 25kg GodSpeed front brake discs then (joke Ian)
Plus a little more for the 17 inch wheels.
Then some more for some pretty dense exhaust lagging.

>Put a little bit more effort into your posts guys
>
Ozzy. Thanks for adding your value ;-)
Seriously though, the BBS code syntax page is a broken link, and I couldn't remember the syntax at the time.

>555kb zip file? Spooky, huh?
>
I didn't notice that. Must be destiny :-)

>Is the setup for the JDM STi-7 the same ?
>
Gearbox will be 'STI 7'
For weight, you'll have to weigh it, or get someone else to weigh theirs of similar spec. Once you guys have some weights, I'll add them to the software for ease of use.
Drag & frontal area for 2002 will be roughly the same as for the 99MY. If you know more exact data, please let me know, and again, I'll add it to the software. If you power test in 3rd gear, the drag power loss is pretty low. If you have these figures wrong by 10%, then you are only going to be out by a couple of BHP. The car mass is the important one.

>300 bhp at the wheels ?? do you mean at the flywheel ?
>
JB means at the wheels. This is evidently the power at which the teeth fall out of your gearbox !

By the way, a little tip: If you want to work out approximate shift points from a number of dyno runs, e.g. 2nd, 3rd & 4th gear runs, just plot them all and select the axes as Vehicle Acc'n vs Vehicle Speed. Where the lines cross is approximately where you should change gear. From the picture below, you can see I should change from 2nd to 3rd gear at just over 60mph.

http://www.ecutek.com/developments/dyno4.png

Cheers

Steve

Needs a curve smoothing function too.

I had the same problem when I used Excel to calculate the power from a DD run, but then I guess you know that. I never took it any further, but it needed a run with the RPM logged alone to get a nice high aquisition rate. I also don't know the steps on the RPM, 50rpm I guess?

Very useful piece of kit.

Paul

Steve,

That is just great.

I'm sure there's more things that can be done, but IMHO this makes DD even more excellent value for money.

Amazing.

Steven, while on Demo mode, when i try to plug in any number for tire profile & tire width the cursor returns with a value of "100".
Any suggestions ?

George

Stephen,

No worries; got to keep a certain standard for our posts otherwise 22b will keep slagging us off ;)

Stefan

Hi Guys,

From hunting around the web I think the JDM STi-7 weighs 1,430 KG without driver and the UK STi-7 weighs 1,470 KG without driver.

The standard wheels are 225 45 17


Can anyone confirm the above ?

Also, when plugging in the data I add my body weight to the car weight correct ?

I am sorry I have not had time to play with it too much, but when I get everything setup and I am driving how do I do the test. Do I just go to the start test screen and then floor it anywhere in 3rd gear ? from standing start ? etc etc ?

Thanks,
Ray

Thanks for getting the vehicle mass data.

Yes, you add your weight and anything else in the car such as the dog (pressed against the rear window during test) and wife (shouting at you to slow down). And don't be flattering with her weight either because the heavier you count her, the more power your car is calculated as producing. Could be classed as one of life's great dilemmas !

You need to select the gear you are performing the test in - 'test gear'. You then need to click on start test - it will tell you what to do. You basically have to drop below 1250 RPM and accelerate until you reach the speed limit of the private road you are on. The test will complete as soon as you lift off.

You can later reload the file and edit any parameters such as 'test gear' or 'vehicle mass' later on if you get updated data on the car for example.

Cheers

Steve

[Edited by StephenDone - 1/29/2003 8:25:24 PM]

>Needs a curve smoothing function too.
>
You can smooth it further by selecting 'Very Heavy' smoothing as opposed to 'Heavy'. It will be interesting to see whether those slight peaks and troughs are really in the power curve, or whether they are just inaccuracies in measured RPM by the ECU. I may need to smooth even more if they are.

>I had the same problem when I used Excel to calculate the
>power from a DD run, but then I guess you know that. I never
>took it any further, but it needed a run with the RPM logged
>alone to get a nice high aquisition rate. I also don't know
>the steps on the RPM, 50rpm I guess?
>
I use 1 RPM steps, though the newer ECUs will report 0.25 RPM increments.

>Very useful piece of kit.
>
Thanks.

>That is just great.
>I'm sure there's more things that can be done,
>but IMHO this makes DD even more excellent
>value for money.
>
Thanks, but come on then - what shall feature I add to make it the dogs ? And no, don't say ECU reprogramming :)

(George)
>Steven, while on Demo mode, when i try to plug in any
>number for tire profile & tire width the cursor returns
>with a value of "100".
>
>Any suggestions ?
>
Well spotted - I did say it was a Beta !
An update fixing this is now on the web site.

Cheers

Steve

Only thing I would add is the rolling radius is going to vary from the free radius of the tyre, and they can grow with speed. Only really an issue if you want to get absolute figures, when really the comparisons will be accurate.

I saw the smoothing options after I posted on johns screen shot!

paul

Steve, Great product & Great customer support as always.
I would like to see (in the future)a user defined export of DD values into labjack memory space so as to trigger various events (alarms) when certain thresholds are reached(temps,rpm,boost, etc).

George

Any chance of some sort of display unit in the future? My laptop doesn't quite fit into the dash...

-Torstein

Fecking excellent... but why is it that MY99> get all the good stuff :(

Paul (MY98)

>Only thing I would add is the rolling radius is going to vary
>from the free radius of the tyre, and they can grow with speed
>
With tyre wear & pressure there are so many variables. In the end I think it's better being simple, since like you say, it's a comparative tool to use before and after making mods.

>I would like to see (in the future)a user defined export of DD
>values into labjack memory space so as to trigger various events
>(alarms) when certain thresholds are reached(temps,rpm,boost,
>etc).
>
So you'd like to operate the labjack relays based on thresholds for diagnostic parameters, yes ? Sounds like a good idea. You could use it to trigger nitrous, water spray & water injection. Could be a while coming though - I've got my hands full right now. Same goes for the dash display, though it is on the cards.

Cheers

Steve

ummm, can someone look at my post above, how do you use the thing ? Can't wait to try it out tonight !

LOL :D

My reply is immediately after your question !

[Edited by StephenDone - 1/29/2003 9:37:48 PM]