MoTeC Global Forum

my dealer set up the intercooler spray commands but it does not work as intended, ie, no water came out in several race events!!

ive gone thru the software and initiated a test, which prove the pump work ok, however there is something wrong with either the control logic or values chosen

im unable to get an appointment for ages it seems so is there anyone will to walk me thru the process of how to check it all.

im reasonably savvy with gold box motec, but this M142 is so different and a long learning curve for me

thanks

Would probably help if you let people know which package you are using

Sorry, M142 plug-in for GR Yaris. I would have thought all the M1 series would use same M1 tune software

Might also be worth posting the config if you can

OK, happy to email them to anyone who offers to help

The intercooler spray looks at the delta between intercooler temperature and ambient temperature.

If there isn't an intercooler temperature sensor configured, the inlet air temp sensor (in the pre throttle body tmap sensor) will be used.

If there isn't an ambient temp sensor, the airbox temp sensor (in the airflow meter) will be used.

If you still have the airflow meter wired and configured (which is the airbox temp sensor) In my experience, this will always read cooler than the inlet air temperature sensor. In these instances, you won't achieve a delta for the intercooler spray to work.

thanks Nathan.

this is an off-the-shelf Motec package for the GR Yaris. I understand the delta T concept but my set up does not make sense

when i go to "áll calibrate", i can see these from when i had the car idling in the driveway yesterday with ambient around 30C:-
intercooler temp 43.7
Inlet air temp 43.7
Airbox temp 42.6
Inlet manifold temp 43.7"

the line in all-calibrate that says "intercooler", is showing disabled with a squiggle line beside the text

AFAIK, there is no specific IC temp sensor so why is this data found? . The Toyota parts system confirms there is no such sensor

I understand the airbox temp usually come from the MAF and if correct, that value simply cant be correct?

Inlet manifold temp is much higher than i'd expect for a car just idling. I checked with a IR gun and got values of 40C on the IC itself, but of course that hardly a precision tool. BUT, I cannot find an actual intake manifold temp sensor and the Toyota parts system does not show such, so where does MOTEC get this value?

My dealer advised the Motec is not configured to use the factory ambient temp sender which was a simple thermistor in grille area directly beside the IC. if Delta T was based on this and inlet manifold, it would make sense!

Hi Terry,

As previously stated, when no intercooler temp sensor is fitted, the inlet air temp sensor will be used.

ON THE YARIS GR, THIS SENSOR IS INTEGRATED IN THE MANIFOLD PRESSURE SENSOR

This T-MAP sensor is an integrated pressure and temperature sensor, hence it has 4 wires - 5V, 0V, pressure signal and temperature signal.

When no sensor is assigned for the intercooler temperature sensor resource, or one is assigned and the sensor is deemed faulty by the ECU, the value of the inlet air temperature sensor resource will be populated in the intercooler temperature.

The ambient temperature sensor in the grille is not available to the ecu. It is not wired to the ECU, nor is it's value available to the ECU on CAN, which is why the airbox temperature value will be used in its place.

As the Yaris firmware in the ECU is essentially GPR, with intergration for the CAN and additional coding for the throttle blip and diff control functions - the intercooler spray is the same one found in generic GPR firmware. The factory Yaris GR did not have intercooler water spray, so there is nothing pre configured for it.

thanks nathan , but this not really help me get these sprays working. can you please help me work out how to interrogate and change the command logic??

ive managed to confirm the 2 temps listed as Intercooler and Intake manifold are from same sensor, located in the plastic pipe from intercooler just before entry to throttle body. im doubtful that the temps shown in Motec are correct and it appears its been a custom calibrate formula used. can you confirm MOTEC did this as part of their research?

i have found the 4 wire MAP sensor but thats in a different location after the throttle. are you 100% sure it includes temp, and if so, what name is it assigned??

the GR yaris has a factory option IC kit and the promo material from Motec talks about it. im therefore surprised its not preconfigured.