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Wastegate frequency
Posted: Mon May 14, 2018 1:34 pm
by tpsretard
Morning guys.
An EVO i working on never had ecu controlled boost.
I am converting the stock boost control valve to a 3 sport solenoid and connecting it to the GeMs. I need to use a frequency between 20 and 33mhz.
The wastegate period is set at 150us, how do i convert that to frequency.
I got 1 Hz = 1000000 µs but that really does not seem right.
Re: Wastegate frequency
Posted: Mon May 14, 2018 1:44 pm
by RickS
150μs = 6.666667 kHz
Re: Wastegate frequency
Posted: Mon May 14, 2018 2:10 pm
by tpsretard
so a 30hz PWM freq is 30000μs
Will the GeMs support this ?
Re: Wastegate frequency
Posted: Mon May 14, 2018 3:47 pm
by RickS
I'll certainly check for you.
Please let me know what version of firmware the ECU has installed and I'll check the archive. (Different firmware, possibly different specification).
A look at the data sheet for the valve would help also...
BR, RickS
Re: Wastegate frequency
Posted: Mon May 14, 2018 5:14 pm
by tpsretard
The ecu is a Lancer evo 6 rally implant. firmware G2.41
The valve is a common 3 port MAC valve. 19 to 33mhz is common control frequency
Re: Wastegate frequency
Posted: Tue May 15, 2018 9:57 am
by RickS
OK...
With the G2.41, you have an option 'WG Period'.
This can be set from 0.00μS to 510.00μS.
You mention 19-33'mHz'. To take 30mHz as an example, that would convert to 0.03333μS, which the ECU can not do.
Most solenoid valves operate operate between 15-50Hz, not mHz, (25-50 times a second). I could be wrong with yours, so please check and confirm.
A value for WG Period of 130-150μS should be OK for your use, if the above is correct.
Re: Wastegate frequency
Posted: Tue May 15, 2018 11:48 am
by tpsretard
Force of habit to put MHZ from my line of work (typing muscle memory)
the valve is 30HZ (feel a little embarrassed),
Re: Wastegate frequency
Posted: Wed May 16, 2018 7:19 am
by RickS
No need.
Easily done...