Unlocking 3000gt G-Sensor Function

[J. Fast]

Is there a way to extract the data from our g-sensors for interpretation in the form of a log? I'm working on a little side project and would like some help unlocking the information to transfer into two dimensional or 3 dimensional graphs for a suspension program. Anyone know how to unlock this feature? I know you can unlock the data on a hondata with an s200 chip, and ofcourse Motec (well because it's motec). I'm looking for the raw data information translated to our stock ecu in various ecs modes IE acceleration, braking, cornering force, what would be the way to go about obtaining the info?

Jeremy

[Blurr]

That would be pretty sweet to know. I noticed the G sensor in the service manual but I haven't found any mention as to what it's actually for or how to access it.

[Flamer]

The G-Sensor was used for the ECS I thought?

[akotten]

Wow....the idea of a built in G-sensor from factory is news to me. I had NO idea. That's pretty neat.

[J. Fast]

The G-Sensor was used for the ECS I thought?

Correcto. I'm currently working on a revised prototype ecs controller. We're building on the last prototype controller (which is already operational and being tested in a vehicle) and discussing incorporating a g-sensor into the revised controller. I'm looking for the raw data so I can take logs of various situations and then write a revised electronic controlled suspension response program based on the additional sensor feedback. Basically we've started from scratch on a custom ecs controller that can be adapted to any year, make, or model of 3/S and are writing our own suspension control program aswell as customized aerodynamic control and I would like to study the information for a basis of comparison and future program tweaking.

The current controller we've proto'd has been installed on a 98 VR-4 with 2nd gen ECS struts and is currently only setup to run 4 basic mode programs. Soft, medium, hard, and diagnostic. THe next proto will have all the bells and whistles.

That's pretty much the project and why I'm after the data. Any ideas you guys can come up with to access the data would be greatly appreciated.

Jeremy

[EthanS]

I was able to read "G's" on my scanmaster3. I'm not sure if that was an internal part of the scanmaster or if it pulled it off of the factory G sensor *shrug*

Also not sure if that worked on lateral G's either, all I looked at it for was acceleration and deceleration. I was able to hit slightly over 1G in either (from a rolling start of course don't have time to look at it in 1st gear acceleration haha)

-Ethan

[Dbeltran24]

Try contacting the guys who are working on Flashing 98/99 ecu's. They might be able to point you in the right direction, since they have broken down most of the code already.

[mb7050]

Correcto. I'm currently working on a revised prototype ecs controller. We're building on the last prototype controller (which is already operational and being tested in a vehicle) and discussing incorporating a g-sensor into the revised controller. I'm looking for the raw data so I can take logs of various situations and then write a revised electronic controlled suspension response program based on the additional sensor feedback. Basically we've started from scratch on a custom ecs controller that can be adapted to any year, make, or model of 3/S and are writing our own suspension control program aswell as customized aerodynamic control and I would like to study the information for a basis of comparison and future program tweaking.

The current controller we've proto'd has been installed on a 98 VR-4 with 2nd gen ECS struts and is currently only setup to run 4 basic mode programs. Soft, medium, hard, and diagnostic. THe next proto will have all the bells and whistles.

That's pretty much the project and why I'm after the data. Any ideas you guys can come up with to access the data would be greatly appreciated.

Jeremy

Sweet. I like the G sensor idea a lot ! Why would you want to use the 3000gt G-sensor(s)? you could use some aftermarket unit like this



http://www.emartee.com/product/41965/Arduino-MMA7260-Triaxial-Acceleration-Sensor-Module

http://www.elechouse.com/elechouse/index.php?main_page=product_info&cPath=152_160&products_id=300

http://www.bosch-presse.de/TBWebDB/en-US/PressText.cfm?id=2887

These are tri axial sensors but you sure can find accelerations sensors too .

now combine these with Steering sensor, throttle sensor and speed and your golden

[Dbeltran24]

out of curisoity. Could the G-Sensor data be used to estimate dyno results. IE HP, TQ, 1/4 mile times, and 0-60's. Kinda like the phone apps or those portable devices you stick to your windshield work. I know it wouldn't be as accurate as a dyno, but it would be nice to get estimates. Might be an interesting feature to add.

[mb7050]

I was just wondering how similar the ECS system used in our cars is compared to Bmw ECS III ?
www.bmwrocketscience.com/.../EDCIII-repair-manual.pdf

[J. Fast]

Anyone know if the stock sensor is a single axis sensor or a tri-axis sensor?

[terrets]

Very cool project Jeremy.

[J. Fast]

Hrmm, I tried pulling up the team3s advanced technical doc on the ECS and it looks like the site has expired :(. Is it just me or is this link not working for anyone else either? team3s.com ? It's in the google cache so I know I'm not going crazy!

Jeremy

[FeaRpb]

Its not working for me either.

[i3igpete]

1297

not very useful at all, actually. it's just an up-down sensor.

http://web.archive.org/web/20080227082334/http://www.team3s.com/STIM91/STIM91.htm

[mb7050]

Actually combine that and ABS g sensor and you have basic setup but not very good one.

This would be quite good setup.
http://img404.imageshack.us/img404/8241/edc3.jpg

[Dbeltran24]

You can do that anyway with MMCD and Evoscan.

Didn't know that. Learn something new everyday

[J. Fast]

1297

not very useful at all, actually. it's just an up-down sensor.

http://web.archive.org/web/20080227082334/http://www.team3s.com/STIM91/STIM91.htm

Thanks for digging that up for me Pete, that was exactly what I was looking for! Looks like our ecs module has some room for improvement.

Some recent suspension engineering developments are offering a differentiating opinion on optimum suspension setups. A number of emerging suspension engineers are arguing suspension setups are being optimized with the implementation of softer springs, stiffer sways, and alternating suspension dampening at the corners (hence programs like active Yaw and 3d g-sensor calibration in the revised EVO).

Our current stock ecs program is programmed for fixed position but may stand to be optimized by writing a new program for alternating the dampening at opposing corners by means of adding a tri-axis g-sensor. That's pretty much what I hope we're able to implement in the revised controller and was hoping the stock ecs controller was a single axis for this specifi purpose. What that means is our stock ECS suspension is far more dynamic and may very well be severely under tuned for it's capability.

I appreciate you digging that up for me! Web archive is pretty cool (I learned something new today)!

Jeremy

[R/T93]

Not to sound like a smartass, butttt, can we just rotate the sensor 90 degrees?

[J. Fast]

In case some people are wondering about validity, here's some cool shit :) I must give props to duke 3s for being a codewriting wizzard!

Phase I. Breadboard.

http://casadiaz.com/wp-content/uploads/2010/07/ecs-ttl-protoboard-pic2-low-res.jpg

Phase II. Microcontroller and Coding

http://casadiaz.com/wp-content/uploads/2010/08/019-lr.jpg

Phase III. Implementation and Testing

3000gt Stealth Custom ECS Controller SW demo (http://www.youtube.com/watch?v=jwhfRh4F0P4#)

[duke3k]

As J Said the first phase of the controller (which is manual control only is in field testing right now in my '98VR4 )


http://www.youtube.com/watch?v=Hor-iSIe2wI

The next phase were working on is to add into the controller the integrated ability to be able to control not only the struts in manual mode but then control the struts in programmed Auto modes based on Sensor inputs. Based on the limited 1 axis support from the stock g-sensor and it's limited rate response we will be going to an aftermarket 3 axis g-sensor to get us where we need to be in terms of what J is looking for in terms of system response.

yes the stock OEM ECS does this...but not as good as we are going to. ;)

[terrets]

That breadboard circuit is weak!....Just kidding thats sweet. I really like how the lights change, a lot :D
That diagnostics mode is ROCKING. And a very nice idea.
Will this make the struts harder then stock? Just a bit would be pretty sweet. I like the Touring mode for soft :).....

I want one!!!!

I think you need a thread for this :D.

You say this is the manual version. Are you planning on making another? And why?

[J. Fast]

We sure are. The next board will have the basic modes soft, medium, and hard (which is one more manual control setting you get over stock) and several other programs, one being our designed intelligent suspension control (which will far exceed that of the stock ecs control setup).

Some additional bells on the revised microcontroller we're testing in my car are integrated aerodynamics, a new suspension response program based on a tri-axis g-sensor, and an intelligent, loggable, and user friendly technolgy regarding the suspension and aerodynamic positions on the vehicle. Another cool feature, one of the modes on the new board will interface with the g-sensor and when is senses an instant g-sensor reading of x value, or a height deviation from downforce greater than z value it will change the attack angles of a front splitter, rear splitter, and rear spoiler and adjust the suspension (yes, I did say rear splitter :D) for high speed to further reduce lift. Additionally it will have an optimized cornering setup that will be dynamic enough to react to center of gravity changes instantly and based on our testing will have the most optimum setup for tire contact.

Jeremy

[terrets]

Sweeeeeet :D. I wish I could work on this project with you....So would this mean my AA would work again? :lol: Without the front AA

[CoopKill]

In for results!

[yellowstealth]

That is seriously bad ass.

[VR4Drive92]

Yeah... this looks pretty sweet... I'm kinda itching to buy something like this...

[duke3k]

all,

I've opened a thread on the project here: http://www.3sgto.org/showthread.php?1765-ECMCU-A-Project-To-Build-an-Integrated-Active-Aero-and-Suspsension-Controller-Systm

Duke3k

[terrets]

Wooooo! and subscribed.