Nissan Data Scan / Factory Ecu Behaviour

[BensDR30]

Quite some time ago, my father bought a copy of NDS for use with their R33 GTS25T. Well, I eventually got around to connecting it all up & going for a drive in our S1 RS4V. After analysis of the date, I discovered a few interesting facts.

For those not familiar with the software, it 'speaks' Consult, and can provide a lot of useful information about your non OBD-II Nissan ECU. There are newer packages available for the more modern power-plants from the same vendor.

Now to the test results...

1. A full-throttle standing start, in 'Snow' mode, with 2nd selected, the high-boost solenoid gets triggered at 5600rpm.

(That dispels the myth that it isn't triggered when in 'Snow' mode)

2. A full-throttle standing start, in 'Normal' mode, with Drive selected, the high-boost solenoid gets triggered at 6000rpm in 1st & 5600rpm in 2nd (don't ask about 3rd, it was a public road with a 100km/h speed limit...) Funnily enough 5600rpm is pretty much 100km/h as indicated in the software.

(That dispels the myth that only low boost is used in 1st)

3. With the boost controls modified to use the restrictor as a permanent bleed (i.e. no solenoid actually in use), the AFM voltage got as high as 4.87V at 6650rpm. This, on an engine with breathing mods of only a Finer-Filter panel, reinforced intake pipe, C34 S2/R34GTT intercooler, JJR bell-mouth dump & 3" Catco Cat, doesn't leave much room for added flow before R&R kicks in.

This occurred on the '2nd/snow' standing-start run, on the 'drive' run it got up to 4.62V at 6250rpm, which is the shift point. That's a bit better, but still only 0.5V away from the limit.

(Those who have been paying attention would notice that the first run ended at a little more than 100km/h )

4. Injector Duty Cycle peaked at 78%, this occurred as the engine bounced off the limiter a couple of times at the end of the first run. It got as high as 66% on the 'drive' run.

5. Timing dropped from 20 to 17 degrees during the 1st-2nd gear change, before returning to 25 degrees at 4000rpm at the end of the shift.

6. It was easy to see that even at low/mid throttle openings at 60km/h on a slight incline, the mixtures are certainly erring on the rich side.

Quite some time ago I bought the Jaycar DFA kit (probably 2 years ago!), but haven't finished building it (I also have the DR30, 240Z & 1200 ute to work on, all of which have long lists of enhancements/projects that are on the go. Not to mention a young family!). Having looked at the figures shown by the brief logging that I performed tonight, I can see that the gains to be had in economy are more than theory. With a heavy car, in (low) boost a lot of the time, optimising the fuelling in the mid-range is of great benefit.

[66yostagea]

That is interesting, because the mods you list in 3 are about the same as mine.I have 3" cat back to fairly quiet (restrictive??) cannon.

I am running 17" and I think am lower is speed than you per 1000 revs. Mine works out at about 10, 20, 30 & 40 kph/1000 revs.

I haven't tried standing starts but on full kickdown it changes at circa 6500. And it gets there frighteningly quick. I too have a Jcar DFA unfitted atm. I think I will make it my next mod after I get the remote oil filter installed this week. I would really like better economy, not because of cost, but to see what can be done without cooking the motor. I have a Fuel Genie from a local computer whiz. It is supposed to save 25% 0n fuel and give better HP & Torque (ACCC tested.) but am loathe to try it till I can get an A/F ratio to make sure it is not running too lean.

[ssshonky]

NISSAN DATA SCAN IS DA BOMB!!!!!

I have a cable I built myself -just been too lazy to hook it up haha..

but yeah.. Stinky Rooster got one from over east for not a lot -anyone interested contact him or buy/steal/borrow a cable - its well worth it!

[KiwiRS4T]

Very interesting. I too have a DFA but I needed help completing it and the EIBC so although I fitted the EIBC which works well (and also tells you the injector cycles) I wasn't confident to fit the DFA and so picked up a cheap SAFC (as well as an SITC) .

When you fit the DFA you will find adjusting will alter your timing but if you can track the timing with your consult then you should be able to fix it roughly with an SITC. I have an LM2 to monitor my AFRs.

If you read the guff with the DFA you will see that it can be calibrated to work in a small range and I was going to (will eventually) install it in the line from the O2 sensor to try to adjust closed loop running in order to improve fuel economy. If that doesn't work I will put it in place of my SAFC. If it does work I will get another DFA to replace the SAFC (seeing as I already have the controller and I can always sell an SAFC).

[ssshonky]

oh but you didnt mention how you can turn off each cylinder individually or " trick " the motor into thinking its running at 110 Deg C - you can also datalog it and graph it in excel etc.

[_Ryan_]

Very interesting. I too have a DFA but I needed help completing it and the EIBC so although I fitted the EIBC which works well (and also tells you the injector cycles) I wasn't confident to fit the DFA and so picked up a cheap SAFC (as well as an SITC) .

When you fit the DFA you will find adjusting will alter your timing but if you can track the timing with your consult then you should be able to fix it roughly with an SITC. I have an LM2 to monitor my AFRs.

If you read the guff with the DFA you will see that it can be calibrated to work in a small range and I was going to (will eventually) install it in the line from the O2 sensor to try to adjust closed loop running in order to improve fuel economy. If that doesn't work I will put it in place of my SAFC. If it does work I will get another DFA to replace the SAFC (seeing as I already have the controller and I can always sell an SAFC).

Haha, my kits have been sitting for 18months waiting for me to get someone to check and finnish my work, as they were my first kits.

I knew most of the above from my informeter, but was still interested to hear about the boost solenoid, mine is bypassed, and i feel i hit R&R with only a 34SMIC, highflow panel, 3" catback, and bypassed solenoid.

Hence i am holding off doing the rest of the exhaust until the kit is fitted.

-Ryan

[BensDR30]

oh but you didnt mention how you can turn off each cylinder individually or " trick " the motor into thinking its running at 110 Deg C - you can also datalog it and graph it in excel etc.

True,

I forgot about all that!

I've had a play with the cylinder tests for power-balance and set the VCT solenoid but haven't changed any sensor values.

As you mention, the datalog files are tab-delimited text, which you can use outside of NDS and graph as you see fit.

[lachlanw]

my data log shows my afm has been up to 4.97 and i aint even done much to my car

6288 rpm

4.96 afm

85.99 duty cycle

84kmh

22 timing

rs four s with HDI fmic and good cat back . r32 wastegate actuator . 11psi

Edited March 11, 2009 by lachlanw

[bubba]

Would just like to add my 2c on how great Datascan is..

I have a remapped stock ECU running the RB30DET in my 32, I also put a carpc in there sometime ago purely so I wouldn't have to plug the laptop in everytime I wanted to check something!

It rocks. I drive around with the dashboard screen up showing a Tacho (as the dash tacho is not 100% accurate) and Water Temp along with an RPM warning light (set to whatever you want) and a Speed warning light (also configurable).

It's always on when the car is on so it's easy to turn datalogging on at any time and is great for the drags and skidpan/track days!

Lastly, it's super fkn handy for diagnosing issues

[ssshonky]

feeel the lurrrrvee for nissan datascan

[Sandeep]

nissan datascan is a very good piece of software for the price. i've used ConZult tuner (like nissan consult full version, auto trans, hicas, air con diagnostics) but I couldn't really jusify the extra cost.

for anyone interested, there is a datascan manual which I found really useful. i think it was made by someone on twinturbo.net

http://www.kroffts.com/kke/files/Nissan%20...an%20Manual.pdf

[bubba]

Cheers for the manual I just fumbled my way through making it do what I wanted it to do

[NewKleer]

dont forget theres obd scantech that does pretty much the same, for free (theres also ecutalk, calumsult, tecu, etc):

http://techdiag.co.uk/obdscantech/web/pg002.html

[andy65b]

dont forget theres obd scantech that does pretty much the same, for free (theres also ecutalk, calumsult, tecu, etc):

http://techdiag.co.uk/obdscantech/web/pg002.html

Will any of these work for OBDII consult cars? ie, 2003 M35

Cheers

Andy

[NewKleer]

no but you have your generic obd2 stuff for those cars, plus the recent blazt obdii cable/sw (which includes nissan specific stuff i think)

[andy65b]

no but you have your generic obd2 stuff for those cars, plus the recent blazt obdii cable/sw (which includes nissan specific stuff i think)

Cool, thanks. That is the way I am looking to go.

Cheers

Andy