Hello from Bulgaria

Your chance to introduce yourself and to ask your first question
Post Reply
dexter_lab
Posts: 3
Joined: Sun Feb 02, 2020 8:01 pm
Soldering skill: yes
Coding skill?: yes

Hello from Bulgaria

Post by dexter_lab »

Hi there,
car is Mazda MX5 with FE 2.0 engine (from Kia sportage) with small turbo
I want to migrate from MS to a microRusefi.
All looks fine except the management of idle valve. The IAC valve is 3 wire bosh 280140553. When not connected, is semi open, 2 coils one is closing it other opens it. the question is:

Can I manage this IAC with microRusEfi? (no additional hardware)

User avatar
AndreyB
Site Admin
Posts: 9882
Joined: Wed Aug 28, 2013 1:28 am
Location: Jersey City
Soldering skill: yes
Coding skill?: yes
Contact:

Re: Hello from Bulgaria

Post by AndreyB »

Not sure about the hardware - maybe we have enough. We definitely do not have software to support such a valve. https://github.com/rusefi/rusefi/issues/1122

is it two solenoids inside or what is it?
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

dexter_lab
Posts: 3
Joined: Sun Feb 02, 2020 8:01 pm
Soldering skill: yes
Coding skill?: yes

Re: Hello from Bulgaria

Post by dexter_lab »

yes, there are 2 solenoids inside. it is one between pin1 and 2 and one between 2 and 3. when both open circuit there is spring that keeps the valve semi open. Applying current on first coil and valve starts to close, applying on the second and it start to open.
I have bench testing on the MS to split the PWM signal and to invert the second one. Of course it starts to heat as trough both coils current is flowing(if I remember correctly it is around and 1A).
Then I made a small board to get the PWM and if below 50% to feed the first coil with % = 50%-Current_PWM second is off, if above 50% duty cycle, the % for the second is = Current_PWM-50% and fist is off. All this was bench tested and except some mechanical noise the generated heat was bearable. Still do not know how the valve will behave in real world when air is passing (if any effect on open close when valve is not powered).
Idle should be closed loop and the ECU will command the valve to adjust the rpm. When exit the idle mode and throttle is open it's not so important (I believe) what is the position of idle valve as the air will flow through throttle body. but when car is on speed and gas peddle is depressed the valve should maintain some air thorough it to keep of too much vacuum right?

User avatar
AndreyB
Site Admin
Posts: 9882
Joined: Wed Aug 28, 2013 1:28 am
Location: Jersey City
Soldering skill: yes
Coding skill?: yes
Contact:

Re: Hello from Bulgaria

Post by AndreyB »

dexter_lab wrote:
Sun Feb 02, 2020 8:08 pm
car is Mazda MX5 with FE 2.0 engine (from Kia sportage) with small turbo
pics? what generation MX5? how hard is the swap?
dexter_lab wrote:
Tue Feb 04, 2020 5:32 am
Then I made a small board to get the PWM and if below 50% to feed the first coil with % = 50%-Current_PWM second is off, if above 50% duty cycle, the % for the second is = Current_PWM-50% and fist is off. All this was bench tested and except some mechanical noise the generated heat was bearable.
this confirms that we have all the hardware needed we just need a few lines of software. The biggest challenge would be to test this :)
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

dexter_lab
Posts: 3
Joined: Sun Feb 02, 2020 8:01 pm
Soldering skill: yes
Coding skill?: yes

Re: Hello from Bulgaria

Post by dexter_lab »

the idea was "start from the scrap"
gear box was from miata, the bell is from mazda B2000, engine is FE3 from kia sprortage (same engine as in mazda 626)

Miata is NB, no VVT 1.6 no AC, here are some pics
CIMG0688.jpg
CIMG0688.jpg (147.27 KiB) Viewed 126 times
CIMG0848.JPG
CIMG0848.JPG (160.85 KiB) Viewed 126 times
DSC_1342.JPG
DSC_1342.JPG (1.27 MiB) Viewed 126 times

Sullivan
Posts: 1
Joined: Thu Feb 06, 2020 11:45 am
Soldering skill: yes
Coding skill?: yes

Re: Hello from Bulgaria

Post by Sullivan »

Hello, I am new to your forum as of today.. I am from Alberta, Canada. I am really happy to be a member of this forum. thanks.

Post Reply