What Else Should I Log

[Duncan]

So I rewiring the data logger at the moment, and I've just found out I can run 3 additional inputs with a minor mod to the logger's hardware.

We currently log:

AFR

Revs

Boost

TPS (throttle)

lateral g sensor

I think I'll add:

brake switch

speed

but that leaves 1 input free. what else has a 0-5v input that I should add?

[Duncan]

ooerr to answer my own question, I might add longitudinal g so I can do this:

http://www.trackvision.net//gallery/Trackv...R-H%2001-07.wmv

[Roy]

You are not logging road speed? Log a front and a rear wheel and it will help you get an idea of wheelspin etc. Better if you can log all 4 wheels.

I log oil pressure, main reason is i can trend the data and get a feel/hint if something is about to go on the engine. I was surprised to see what different oil filters did to oil pressure.

Also, rather then a brake switch, may be worthwhile putting a pressure transmitter in line so you can record actual pedal pressure.

I woudl love to also log steering, but the sensors are damn expensive

[Duncan]

yeah speed from the gearbox sender, tapped into the terratrip. I should have added I don't want to spend any money so standard senders only - I guess oil pressure might be a good addition considering what I do to those motors. maybe even knock if only i could get a 0-5v signal for that

[sh@un]

oil pressure or exhaust temp

[Duncan]

hmm another idea from savman, attessa torque.

now i need another 3 inputs instead of having 1 too many lol

[Roy]

Knock is difficult, its not a linear signal

[Sydneykid]

The Pi System 2 is a combination dash and logger, so I have to log what the dash displays, plus a few more that I select. I currently log;

Engine RPM

Boost

Lateral G

Longitudinal G

Front wheel speed (swap from left to right depending on the circuit)

Voltage

Logger temperature (cabin temperature)

Oil pressure

Water Temp

Lap times

That enables me to draw a track map and compare speeds all around the track over different laps. The Pi System 2 also has programable warnings, so I don't have to display all the sensor readings, it flashes and then displays if any of the readings goes below/above a preprogrammed level. For example it doesn't display oil pressure unless it goes below 20 psi.

I have one spare channel, so I switch between EGT (GReddy gauge), fuel pressure, water pressure, inlet air temperature and A/F ratio (as output by the W02).

The Datalogit records all of the engine stuff, but only if I have the lap top plugged in. The Tech Edge W02 logs the A/F ratios, engine RPM, throttle position, AFM voltage and boost.

I can link and compare all of the data via engine rpm. It takes me about a week of nights to compare all of the data from a weekend's racing. At the track I simply look at lap times and speeds around the track Looking for somewhere to go faster, that's what it's all about. I do glance at the oil pressure and water temps as an early warning.

So plenty of choices there for you .

Cheers

Gary

[Duncan]

jesus Gary it would take forever to put all of that together.

I'm using the wb02 as well, and it actually has 7 user inputs not 3, you make a minor change to the board so they dont operate as thermocouple inputs (remove 1 resistor and replace another with a link).

Datalogit would be better but it doesnt seem to have any memory, and a laptop isn't practical

do you have the calibration for standard map sensor and standard g sensors?

[kjb_r33]

I fitted a bosch 3 bar map sensor to mine, so i can log manifold pressure/boost as well.

[sav man]

I got the attessa gauge logging on my FC-Datalogit, i'm gunna get a Asus eeepc to put in the glovebox and log. Where is a 5V brake line? the only one i've found is the 24V one.

You like the look of the Trackvision Duncan? I'm 99% sure i'll buy a copy, esp since i invested 2 days on making a Nismo dash for it (speed, rpm, boost, attessa, tps, brake)

Edited January 27, 2008 by sav man

[Duncan]

hmm ok, I need to check the brake switch i just assummed it was 1v lol....better check that out before i blow the logger up We modifeied it today to run 6 x 5v inputs instead of 3x5v and 3x thermocouple - remove 2 resistors off board and replace 1 with a link

I'll buy trackvision for sure, I saw your dash and love it, but I think I will go with a different stlye anyway - want to run g circle off the attessa sensors. all a bit of an experiment atm, to be honest I am much more interested in adding the dash to video than I am in analysing data (sorry Gary lol)

Am I missing something or does datalogit have no onboard memory, ie I have to run a PC to save data. And I saw your post re logging attessa, thanks.

[sav man]

I wish Datalogit had onboard memory! That's when i'm getting the Asus eeepc, it's realy small (fits in a glovebox) and it's cheap (like $600), I can live with leaning over the press F1 button and close the glovebox (hell if i could be bothered I could probably basterdise the laptop and put a start and stop log button on the dash)

[Duncan]

hmm there are lots of problems running a pc in a race car ( i know some people run them in road cars but its just so much worse in the race car).

Mark's big crash in 04 was because he was playing solatiare mid stage. yes that was a joke.

but reliabile power supply at the correct voltage, hard drive life, where to mount screen and keyboard are all issues. There are some solid state memory options instead of hard drives these days like a CF to HDD adapter so you just run say a 2gb CF card.

BTW did you get the dash working in some footage? How do you line up the .PNG with the gauge definitions, is it just pixel locations in their .properties files? Looks almost too easy to do?

[sav man]

The dash is pretty easy to setup, if you read the .properties file it has all the co-ordenants for the objects, it's not very hard, just lots of trial and error to get it all the line up. I'll send you all my files when i've finished it, the only footage i've got is the demo footage, I havn't got a cam yet.

The eeepc is a laptop with a solidstate hdd (8gb SD to be exact). For Targa (where the nav can start it logging, and slam it in the glovebox ), and super sprints I think the eeepc will do me fine. But for proper circuit racing I recon it'd be a pain.

[Sydneykid]

jesus Gary it would take forever to put all of that together.

I'm using the wb02 as well, and it actually has 7 user inputs not 3, you make a minor change to the board so they dont operate as thermocouple inputs (remove 1 resistor and replace another with a link).

Datalogit would be better but it doesnt seem to have any memory, and a laptop isn't practical

do you have the calibration for standard map sensor and standard g sensors?

It kinda just grew over time, the Datalogit was first, then the WB02, the latest was the Pi S2. I am used to them as we had them in the Perkins customer Commodores and the SuperTourers. So the software is very familiar.

I wrote the boost calibration table for the WB02 in the R33GTST using the Greddy boost gauge, the Power FC Commander and watching the voltage on the WB02 lap top screen. It was pretty simple, I picked around 10 points and just lined up the boost level and the voltage on an Excel spreadsheet, then copied that into the WBLOG table. I will have to do same and make up a table for the R32GTST as it seems to have different voltages from the Apexi map sensor than the R33GTST.

No G sensors in the 2wd's

Good tip on the WB02, thanks.

Yep, no logging memory in the Datalogit is a pain, but between the WB02 and the Pi S2 I have more than enough data to make my brain hurt.

Cheers

Gary

[djr81]

Well for my 10 cents if you are chasing lap speed the following would make the list:

Engine rpm.

Longitudinal gees.

Lateral gees.

TPS.

Steering input. (Check on understeer/oversteer lap on lap or after set up changes)

Car speed in km/h. (makes it easy to figure out if a short shift costs you and where the engine is spending its time on a revs vs speed chart so you know which rpm to chase torque at)

Brake pressure (or digital on/off if you are short)

Boost.

ATTESSA output (If you are messing with this it helps to know what your settings are on corner exit etc)

Edited February 4, 2008 by djr81

[DRIFTER]

The Pi System 2 is a combination dash and logger, so I have to log what the dash displays, plus a few more that I select. I currently log;

Engine RPM

Boost

Lateral G

Longitudinal G

Front wheel speed (swap from left to right depending on the circuit)

Voltage

Logger temperature (cabin temperature)

Oil pressure

Water Temp

Lap times

That enables me to draw a track map and compare speeds all around the track over different laps. The Pi System 2 also has programable warnings, so I don't have to display all the sensor readings, it flashes and then displays if any of the readings goes below/above a preprogrammed level. For example it doesn't display oil pressure unless it goes below 20 psi.

I have one spare channel, so I switch between EGT (GReddy gauge), fuel pressure, water pressure, inlet air temperature and A/F ratio (as output by the W02).

can you tell me more about your water preasure gauge? where do you take it from? what pump do you use? do you have bleeds in the head? do you have any tips for keeping engines cool?

thanks

nathan

The Datalogit records all of the engine stuff, but only if I have the lap top plugged in. The Tech Edge W02 logs the A/F ratios, engine RPM, throttle position, AFM voltage and boost.

I can link and compare all of the data via engine rpm. It takes me about a week of nights to compare all of the data from a weekend's racing. At the track I simply look at lap times and speeds around the track Looking for somewhere to go faster, that's what it's all about. I do glance at the oil pressure and water temps as an early warning.

So plenty of choices there for you .

Cheers

Gary

[Sydneykid]

can you tell me more about your water preasure gauge? where do you take it from? what pump do you use? do you have bleeds in the head? do you have any tips for keeping engines cool?

thanks

nathan

I don't actually have a water pressure gauge, I have a 2 bar pressure sensor plumbed into the thermostat cover which is wired to the Pi dash. Simple stuff, just drill and tap the appropriate plumbers thread into a hole in the alloy cover. You can use an electronic fuel pressure gauge or a boost gauge to display water pressure.

I don't use anything exotic in the cooling systems, a standard RB26 water pump, the N1 water pumps needs too much consistent high rpm for an RB30. I use the standard Nissan air bleed system and a standard Nissan thermostat. The first thing I fit to any track car is a big oil coooler, properly ducted. I only use tube and fin intercoolers, never bar and plate. The standard radiator is pretty good up to 350 rwkw or so, then I use a PWR. the mai nproblem i have found with the standard radiator is not cooling, but cracking of the plastic tanks.

Cheers

Gary