ECU Tunes and Installs

[Jason Broadhurst]

Took it for a good drive today, the VVT went really well. Massively lean anywhere there is cam advance, which means VE has increased significantly.

[Jason Broadhurst]

In the vid you appear to be discussing things as if the scaling is 1v/div however the scaling looks to be 2v/div.
The initial problem is probably also a rookie mistake, it took me a while to find when I did one. It is not a problem with ECU channel thresholds.

Good pickup, in which case the lower voltage is about 1v and upper is 6 odd, meeting the SPI threshold. I'm going to fit proper resistors tomorrow and try a a 5v pullup to see if that cleans up the noise and work out a 5v pull up resistor value.

Dyno tomorrow night

[elfturbomax]

The problem is the sensor is being operated outside it's specifications. Because ...

[Jason Broadhurst]

Not sure what you are getting at. The sensor is a hall sensor, it's a coil of wire and some transistors. It requires a pullup, as the sensor itself, while being an active component, pulls down. The stock ECU had a pull up resistor inside it to lift voltage, and was programmed to suit whatever the on and off voltages ended up being. The sensor itself can run on ~3V to probably 24V. The pull up can then be anything between that.

The problem I had was that the ECU is armed when greater than 2V for the on voltage, and then is triggered as the voltage falls below 1V. With the internal pull up on the SPI, it didn't meet the on voltage of 2V, and then with a 1K1 external pullup it was too high. I ended up with a 9k7 pull up to 12V which gives a nice clean square wave and most importantly, keeps the ECU happy.

Obviously, using the internal pull up, and then having software adjustable trigger voltage thresholds would have been ideal, but that will come with later firmware updates. So with fixed ECU threshold voltages, I just adjusted the HALL voltages by way of pullup resistor to satisfy the ECU, an absolutely acceptable result.

The noise in my pictures was my scope lead on the dick I found out.

[elfturbomax]

What voltage does the ECU internal pullup connect to? 5, 8, 12 ?

[Jason Broadhurst]

It would likely be 5, given the hard coded voltage thresholds are 2V on and 1V off, but I didn't measure.

[60TJZ]

have you tried more boost? I find that always works.

[Jason Broadhurst]

This Ute is spastic enough with 8psi. Think 1uz with 8psi as they are same OEM power, torque and capacity.

[60TJZ]

This Ute is spastic enough with 8psi. Think 1uz with 8psi as they are same OEM power, torque and capacity.

god its like I don't even know you.. I don't like this negativity of "enough"

[Jason Broadhurst]

I suppose you think the soop needs more power too though LOL

[I'm DJ!]

It does if it wants to be the most powerful supra on pf

just sayin'

[60TJZ]

I suppose you think the soop needs more power too though LOL

well duuhh of course it needs more power

It does if it wants to be the most powerful supra on pf

just sayin'

challenge accepted
how much did I miss by lol..

[I'm DJ!]

>< that much

[Guido]

It does if it wants to be the most powerful supra on pf

just sayin'

So do you.

[I'm DJ!]

Shudduppayaface you