Howard Coleman

iTrader: (6)

tim,
open data log lab
go to file
select log
open a log.
draw graph
select a portion of the run... ideally a 3rd/4th gear pull.
determine the start and end of the pull.
note the sample range (bottom left)
click tools
click power graph
stipulate rx7
enter accurate vehicle weight w driver gas etc
enter gear
enter sample range
click draw graph
fiddle w the smoothing to fine tune

howard

DataLogLab

Just like Howard says, except get the Sample Graph showing only the section of data log that's a Power Run before opening the Power Graph window, then you won't have to set it in that window.

The easiest way of zooming in on the section of data you want to do the Power Graph over is to:

1. Click on any one of the traces on the graph at a point that corresponds to the start of the Power Run - this should leave just the point in time highlighted on the graph.
2. Right-click the graph and select "Set Plot From".
3. Click on any one of the traces on the graph at a point that corresponds to the end of the Power Run - this again should leave just the point in time highlighted on the graph.
4. Right-click the graph and select "Set Plot To and Draw Graph". This should leave just the Power Graph shown.
5. Select Tools->Power Graph and carry on as Howard suggested.

After the Power Graph is draw, if you select Tools->Copy to Sample Graph from within the Power Graph window, the Power, Torque, and Speed information will be copied back to the main Sample Graph window, and can then plotted along with the rest of the data items.

Thanks,

Glenn
Data Log Lab Support
www.dataloglab.com

Steve_S13

hi will this work wiith the Nissan CA18DET

I use an AP Engineering Power FC on my CA18DET and a datalogit box which the appropriate datalogit software for CA18DET converted from the SR20.

Will this function ok?

Steve_S13

hi will this work wiith the Nissan CA18DET

I use an AP Engineering Power FC on my CA18DET and a datalogit box which the appropriate datalogit software for CA18DET converted from the SR20.

Will this function ok?

DataLogLab

Hi Steve.

It should work fine as the SR20DET is fully supported. If you're having trouble loading a data log it may be a slight difference in the engine designation that is reported in the first line - changing this to match a genuine SR20DET should get it working. Can you send through an example data log to support@dataloglab.com and I'll take a look?

Thanks,

Glenn
Data Log Lab Support
www.dataloglab.com

Steve_S13

i got your email and ive just sent you two 3rd girl pulls ive done and logged via my power fc and datalogit software.

let me know what you think

ive also emailed you info on the Euro Spec RS13 CA18DET Nissan 200sx along with full gearbox ratios of the car

hope this also helps with the development.

let me know when your doing an update please

RICE RACING

FRUSTRATING SOFTWARE !

I am not a computer person but not useless either (studied software programing for a year or two !).

I cant even open up a .txt (datalogit generated) file there is no PFC/RX7 in the drop down menu of file types, it comes up with errors and I just dont ahve time to Fu(k around seeing what file I need or car profile or add on etc etc etc or software version etc.

If you make a product that works on a CD I will buy it today.

What I want is put a disk into a win 98 machine instal it click on file open, get my Power FC data logs and click a menu or two to get a graph going....

If someone from you comany wants to tell what the hell it is that I am doing so wron please feel free to do so.

riceracing@ozemail.com.au

Would have been real handy as I did two Apexi Power FC cars in two days and could have used the on road dyno feature.

P.S. One of my customers is a computer software person and he said your site was ******* hard to follow navigate and see what files were needed to get it to work for our application, I gave him his log file 3rd gear pull and have not herd from him either so I can only assume this computer literate person could not get it to work either ?

Howard Coleman

iTrader: (6)

here's how i do it........


click on program icon to open

looking at the program window entitled DataLogLab

click file
click open
looking at a Window entitled Open go to Look In click drop down
click Program Files
click FC Edit
click Logs, Open
you are now at the familiar Datalogit Logs page.
pick a log, Open
you will revert back to the Dataloglab page and watch the log load
click Draw
you are looking at the entire Log.
if you want to quickly graph HP and Torque ....
deselect from the left column everything but Map and Speed. click Draw.
select the spot where you want the run to start. left click it. then right click and select Set Plot From. left click the end point. right click and select Set Plot To.
click on Tools. ( you need to double click) select Power Graph.

you are now looking at the Power Graph and will need to enter some data.
Car
Smoothing
Weight... include driver fuel
Gear
click Draw.

while this sounds complicated i often do it between runs on the road in my car w my laptop and can go from a Datalog log to a Power Graph in a minute.

good luck,

howard coleman

DataLogLab

Hi Rice Racing.

Sorry you didn't have a good experience using Data Log Lab, though this is actually the first negative feedback we've had in over five years - there's plenty of happy testimonials on the web site. But still, all feedback is appreciated.

But if you first problem is that you don't see entry for "Universal - FC-Datalogit RX-7" in the File Type field when opening a file, we need to get it using the right data log definition file. This is picked by the user the first time the application is ran, but here's how to subsequently change it:

1. Go to Customise->Options, and in the Options window select the File Locations and Power Graph tab.

2. The third field down is "Path and File Name of Universal Data Log Definition File". If this field's value isn't (assuming you installed to the default location):

"C:\Program Files\DataLogLab\Universal Data Log Formats\FC-Datalogit_RX-7_DataLogDefinition.txt"

click the browse button to the right of the field and select the file above.

3. Click the OK button in the Options window

4. Click "Yes" to the question "Do you want to clear your existing set of graphs?"

5. Now you should see "Universal - FC-Datalogit RX-7" in the File Type field when opening a file.


You can't avoid tweaking the RX-7 Car Definition as all the info in this is used to calculate the power, no two cars are exactly the same, and the data log doesn't contain anything that could be picked out by Data Log Lab automatically to find the figures.

The Power and Torque figures are calculated once you've identified a part of your data log that is a Power Run, by opening a Power Graph from the Tools menu.

With all software it's difficult to find a balance that suits everyone between ease of use and being able to control in detail powerful functionality. To be fair, Data Log Lab falls towards the latter, but the detailed on-line instructions that ship with it contain several 5-minute tutorials that are designed to get the new user up and running with a minimum of fuss, and does highly recommend go through these as a first step.

Glenn
Data Log Lab Support
www.dataloglab.com

Howard Coleman

iTrader: (6)

i neglected to mention that once you have downloaded a Datalogit Log into DataLogLab (DLL) it remains in the files section so you don't have to go back to Datalogit and retrieve it a second time should you wish to revisit it. so you end up w a library of Log files within the DLL program which are immediately acccessable.

howard coleman

RICE RACING

Thankyou Glenn and Howard.

Today when I get back to the tuning PC I will give that a try. I threw a half full Coke bottle about 50 meters into my neighbours yard across the street I was that frustrated Customer was very impressed with the distance I achieved though

Thanks again for the calm explanation after my "excited" post

Peter

RICE RACING

Well the power graphs and Vmax readings do not correspond with raw data coming fromthe PFC logs.

For example a 3rd gear pull yielding 161kph @ 8000rpm with al correct data in car profile generates a Vmax 210kph on the graph. the power is exactly where I would expect it to be around 196rwkw level but the speed is off, when you change the gearing parameters to make the Vmax onthe graph correspond with the data log it goes pear shaped and gives stupidly low figures...

Ideas??

Also of note the conversion from old shitful units to real units (imperial to metric) does not change over the frontal area unit description nor the values, same for allot of the other fields... it needs allot more work before you can start charging money for the product it seems form my few hours playing with it so far.

Can you address these short falls?

My customer will forward you the files in question so you can sort these issues out.

Peter

Max13BREW

Hi,
I am Petes customer...my poor little baby is not quiet capable of the vmax speeds the program is giving me at the moment..
I will send a copy of the 3rd gear run through to the support channel, and hopefully we will get this sorted.

I would have to agree with Pete and say the program needs some polish. Mainly in the conversion factors between metric and imperial. Also some indication of critical fields that need to be filled out would be helpful. The website however is "somewhat" difficult to navigate. A little more structure, and possibly explanation on what files are needed to complete the package could be helpful here. For example, even listing files as "Main", Car definition files for program, and car definition files for power graphing. and then a brief explanation on top of each pile would help!
I think with some minor changes however that this program will definately be finding its way onto my pc permanently.

Here are some screen dumps:-








Info on car:-
1998 model series 7 Aus spec
Apexi Power FC (Series 1-3)
SMB 3.5" full exhaust, with 4" metallic substrate cat.
Greddy Airinx Panel filter
Bottom of airbox opened.
NGK B9egv's
Lightweight flywheel, and cerametallic clutch
everything else stock as a rock!

Howard Coleman

iTrader: (6)

since frontal area and drag coefficient v power determines top speed perhaps the frontal area is off... the fd frontal area should be either 19.26 sq feet or 1.79 sq meters. drag coefficient of course can vary but stock for the 93 is approx .30. my guess is later models w their larger nose, brake ducts etc have more frontal area and more drag. the R1, circa 1993, has more drag some of which converts to downforce. last time i did the formula it took 34 more rwhp to drive the R1 to 200 mph. my top speed numbers from the program (Vmax) appear on the money.

howard coleman

Max13BREW

Thanks Howard,

I did make a conversion mistake (I had converted from feet to metres...not squared!) However....
Changing the frontal area to 1.79 sq metres, and increasing the drag to .32 (A guess...mine has the same frontal as the R1, and a less functional rear spoiler from all accounts, however the larger rims will also account for more drag (Both wind resistances and rolling drag))

Now I have a vmax of around 278kph in 3rd gear..and a power figure of around 155rwkw
Speed should be around vmax 170-180kph, with power in the range of 190-210rwkw.

Frustrating......

DataLogLab

Hi guys.

Thanks again for the feedback.

Peter, Sandy - The Vmax figures is the car's theoretical top speed based on the power generated and the air resistance calculated from the aerodynamic information, assuming gearing isn't an issue, i.e. it's not the maximum speed obtained during the Power Run, but what the car should be capable of given "perfect" gearing.

Peter - I can't reproduce the problem with the frontal area unit description - can you give the steps you followed?

None of the fields automatically convert when the units are changed, because you're just as likely to have already typed them in correctly and simply want to change the designation, i.e. typed m2 in the field when units is set to "Imperial", and then just want to change the designation from "Imperial" to "Metric". However, I can see how having Imperial and Metric Car Definiton files ready to download will alleviate the problem of having to convert all the figures as a first step.

Unfortunately all the fields in the Car Definition are critical, as any incorrect ones will skew the results - I add 10 lbft to my own Power Graphs by accounting for tyre wear in the drive wheel radius.

I must admit I'm surprised at the extremely slippery aerodynamic numbers the RX-7 seems to be endowed with - the frontal area seems small and the Cd low. These figures give a high Vmax, and lower power required to achieve a given speed - does anyone have any Mazda docs where the aerodynamic properties and stock top speed are stated?

Sandy - was your Power Run done on a level straight section of road with no wind? If you're unsure, do a Power Run each way and the figures will be the same if the road meets all the conditions above.

Thanks,

Glenn
Data Log Lab Support
www.dataloglab.com

BTW, Data Log Lab does already have hundreds of paying customers!

RICE RACING

O.K. I understand the Vmax calculation now... from my own derived data and formule that corresponds with what I would expect power wise.

Runs were flat and nill wind, checking both the data I gave Sandy and my own much bigger log with a similar sample on it I was getting figures of around 196rwkw range which is what I would expect given the set up and fuel usage and other parameters.

I suppose I should have though more about the tilte "Vmax" its pretty obvious now

RICE RACING

Why then is the Vmax in Sandy's last attached picture only 205kph? there are a few things that dont add up and cause a bit of confusion, but only new at it (that program) so that could be the problem.

Howard Coleman

iTrader: (6)

aforementioned frontal area and drag coefficients come from mazda and are in print. you may refer to: "RX-7" by Jack K Yamaguchi and John Dinkel. published in Japan for Mazda which is the factory sponsored story of the development of the 3rd gen RX-7. page 71 lists aerodynamic characteristics. data from Mazda.

small frontal area and low aerodrag is one of the many factors making the 3rd gen without a doubt one of the most potent mass produced sportscars in the world.

my street 7 weighs 2640, 53% rear weight is making mid 450 rwhp and there's still around 100 hiding somewhere...

the DataLogLab will play a part in helping me find the missing hp... now if my new I D # would not come up invalid i'd be back doing Power Graphs from today's runs.

howard coleman

DataLogLab

Hi folks.

Peter - Sandy's Vmax figure is different because his car definition is different in terms of weight, gearing, or aerodynamics.

I've altered the Car Definition window today so that a change of units from imperial to metric and vice versa now asks whether the user wants the figures converted as well - the next release should be available shortly with this feature in.

Howard - that sure is one slippery car then! Does anyone have the advertised top speed form the factory, for e.g. the 280 hp version of the 3rd gen?

Thanks,

Glenn
Data Log Lab Support
www.dataloglab.com

Matt Hey

I don't know about the 280 HP RX-7 but the 255 HP US spec I believe was...

'93 RX-7 R1 .31 Cd ~2789 lbs without driver = 159 mph top speed
'93 RX-7 base .29 Cd ~2778 lbs without driver = 161 mph top speed

The data doesn't come from the same source so accuracy may be questionable. The R1 has the rear spoiler to slow it down and add drag. It also has the front lip but I doubt it adds drag.

Max13BREW

Ok...using all the information gathered from here..and using a 1.391 3rd gear (Which appears to be a more correct gear ratio for third gear), I also used a .30 CD, as it appears my cars is between the R1 and the base model (I have the front lip..I have a spoiler on the rear..but I also have the series 7 spoiler which is meant to be less effective than the series 6 version)
After I verify accuracy against a dyno I will share again..







Pete,
How do you think this graph would compare in real life, on a real dyno?

Thanks for the help guys, if this works out somewhat accurate I will be buying the product. Also thankyou for fixing the metric / imperial problem.

Howard Coleman

iTrader: (6)

Important Correction:

in an earlier post i incorrectly listed the FD 3rd ratio.

the correct 3rd gear is 1.391. since gearing changes torque and torque derives HP it is very important to use the correct ratio. my apologies.

howard coleman

DataLogLab

Hi Sandy.

In your images of your Car Definition your frontal area is 5.87 m2, which is very high - I think Howard ealier quoted 1.79 m2.

Thanks,

Glenn
Data Log Lab Support
www.dataloglab.com

Max13BREW

Sorry...my mistake!

I uploaded the wrong car definition link!

The other two appear to be the correct versions. I have corrected the link above.

Now the whole three are from the same settings! (Stoooopid me)