VEMS S2 trip computer ouput

[a4kquattro]

If that also works on our S2/RS2 cars then it's useful. IIRC until now TDS-1 only worked on UrS4 cars

we dont have a test car here, but to my knowledge it should work on an s2. if it doesn't work for some reason, we will make it work.

[Jamo]

Lets face it your not short of guinea pigs from the forum

[mouse]

we dont have a test car here, but to my knowledge it should work on an s2. if it doesn't work for some reason, we will make it work.

Is it because the S2 ecu has no output signal for boost pressure? - see pin 32 Here.

I think some people who put an ABY ecu in an AAN S4 lose their digital boost readout where they had it before.
This also makes sense as we cannot read boost with vagcom.

There would have to be a boost signal inside the ecu somewhere so maybe it would be a case of having to opening up the ecu to solder in a connection from the signal to an unused pin. .. That is if the the internal voltage would be the right scale for the TDS-1 unit.

Would be a great feature to have - the centre vent gauge position is a bit too far out of the line of sight while driving. . ... (although first I have to find an autockeck unit as my S2 has had its replaced with a minicheck )..

[S2central.net]

It is desperately easy to make pin 32 work on the ABY ECU... simply strap the middle pin from the MAP sensor to the unused pin and hey presto.

[prj]

It is desperately easy to make pin 32 work on the ABY ECU... simply strap the middle pin from the MAP sensor to the unused pin and hey presto.

Exactly. Takes... omfg... 5 minutes!

[S2central.net]

This TDS-1 thing will have to be smart enough so the boost signal can be scaled correctly as the sense of 0-5V correlates to different pressure depending on whether 200/250/300kPa or bigger MAP is fitted. That shouldn't pose a big problem...

I for one would like that autocheck display to show things like intake air temp and/or EGT by connections to external sensors - not just boost. It will need to select units in celsius/fahrenheit and bar/psi - seeing as the 'murricans cannot leave those imperial units to history

The list of ideas could be pretty endless but don't want to make this into a horribly complicated and expensive affair.

[S2central.net]

LOL - just looked at the website and its all there except EGT but that's fine. The instructions will need to be modified to align with an S2 installation. I for one would be happy to be a guinea-pig and put some time into an S2 installation guide.

[mouse]

It does most of that already - although not EGT. [edit: too slow ^]

http://www.boost-instruments.com/TDS-1.html

The TDS-1 has the following features:

Digital manifold pressure display (boost / vacuum)

- Configurable display units: kPa absolute, or PSIG/inHg
- Peak hold mode displays highest pressure above atmospheric measured in last 5 seconds
- Rapid display update, every 125 milliseconds
- Connects to the Motronic ECU external boost signal
- Highly accurate, displays same signal ECU uses to run engine
- Resolution of 1 millibar or 0.1 PSI, 0.1 inHg
- Configurable for Bosch type MAP sensors of 2.0 - 4.0 bar including VMAP


High precision voltmeter

- 3 digits, with 1/10th volt resolution


Intake air temperature sensor display

- Piggybacks on to the IAT sensor monitored by the ECU
- Does not interfere with the ECU reading
- Configurable display in degrees F or C
- Includes peak-hold mode


Radio display pass-through

- When selected, radio display works as from the factory
- Automatic mode, where radio display changes are displayed for a short time before reverting to previous non-radio display mode.


Antenna relay driver for 1994 cars with power antenna

- By special request only
- The relay (not supplied) is engaged when the stock radio is in radio mode, and is not engaged in CD or tape modes. This relay deactivates the electric antenna when it is not being used, saving needless wear-and-tear.


Display modes

- The device settings are preserved across power cycles. For eample, if the user leaves the display in peak boost mode when the car is shut off, the TDS will resume in peak boost mode when the car is restarted.
- Modes are selectable via a single button interface
- Button is user-supplied. One side connects to the TDS device, the other to ground.
- A stock switch (fog light, etc) may be modified for momentary operation.
- Any momentary switch is suitable.
- Pressing the button will cycle through the enabled modes. Unwanted modes may be disabled by the user.
- Typical modes: Instantaneous boost, Peak boost, Voltmeter, IAT, Radio/Tape/CD


Configuration mode

- Entered via long button press (>2 seconds)
- Configuration variables:
- MAP sensor type (2.5 bar, 3 bar, etc.)
- Desired pressure units (PSIG/inHg, millibar absolute, kPa absolute)
- IAT units (degrees F or C)

[a4kquattro]

It does most of that already - although not EGT.

yes, EGT is also supported via an add-on module called the TDS-X. Its not discussed at length on the boost-instruments website but I'll have all the details on my website once all the boards are ready to go.

[s2_wot]

Definitely interested to see how this progresses...

[Mcstiff]

Update?

[Jaap]

Fuelsignal

Hi All,

did some measurments.
Hopefully someone can use this for getting the tripcomputer working with a aftermarket ECU.

[A80Avant]

I'm afraid Marc hasn't progressed this due to lack of interest. It would be a nice feature to have though..

sent with Nokia 5110

[prj]

The signal from the ECU is not analog, it is digital AFAIK.
Measuring voltage is pointless, you need a scope.

[Jaap]

The signal from the ECU is not analog, it is digital AFAIK.
Measuring voltage is pointless, you need a scope.

The signal from the stock ECU is PWM.
But the trip computer can messure both.
So if you have a aftermarket ECU what sends out a anlog signal, you can connect it on the trip computer.
PWM is also posible.....but you need a scope to find out the curve....that's correct.

Cheerz