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Home > Beginners Tech > so... what does "duty cycle" actually mean?!

Turbonator

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AKA: Smegmium

Derby, ish

Yes it does look a bit Maplin-parts-box, but if it does what he says then it seems a decent bit of kit.
just sent a message to ask if it can display in PSI...


On 20th Feb, 2016 PhilR said:
For the same price as the AEM, you can buy a Microsquirt with closed loop and mappable boost control (not to mention everything else it does).

On 18th Feb, 2016 Smegmium said:
Good answer Denis, thank you!

I was looking at something like this:
http://www.ebay.co.uk/itm/322007561142?_tr...K%3AMEBIDX%3AIT

However that one only appears to display BAR.


Just had a good read - it looks very interesting, does closed loop and open loop (with full control over the closed loop PID settings if you really want). It looks quite 'home brew' on the face of it, but that's no reason to doubt it does what it should.

...Interestingly, he also does a wideband controller too.

"If its not broke, whack a turbo on it"

https://www.youtube.com/c/turbominitv


PhilR

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On 20th Feb, 2016 Turbo This.. said:
i thought they worked similar to idle air control valves?

Yes it's the same sort of hardware as IAC valves that are also controlled with PWM.

The problem is how you control the solenoid's duty cycle... With IACs and most ECUs, you can either use a fixed duty cycle (open loop) that gets the RPM close enough, most of the time, or tell the ECU exactly what idle RPM you want and let it vary the solenoid duty cycle (closed loop) to get more precise control, all of the time.

On 18th Feb, 2016 Smegmium said:
...I was looking at something like this:
http://www.ebay.co.uk/itm/322007561142?_tr...K%3AMEBIDX%3AIT

However that one only appears to display BAR.


I messaged him earlier and he replied quickly enough: "I can make yours display in psi but there is no way to change it back and forth"

Edited by PhilR on 20th Feb, 2016.


Tom Fenton
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Looks a decent bit of kit. If it does what it says it's far better value than the AEM liar-boost.


On 29th Nov, 2016 madmk1 said:


On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else


Like fuel 😂😂


metroturbo

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That looks like it could be arduino based, and a quick google has thrown up plenty of hits for arduino boost controllers. If you like playing with electronics, a home brew boost controller is easily possible. Mind you, at £99 for a boost controller it might not be worth the bother other than for something to mess around with on cold dark nights.

Edited by metroturbo on 21st Feb, 2016.


Turbonator

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52 Posts
Member #: 11169
AKA: Smegmium

Derby, ish


Yes I was thinking it was likely to be arduino (or similar) based, again if I can get the Microsquirt to do it I will...

On 21st Feb, 2016 metroturbo said:
That looks like it could be arduino based, and a quick google has thrown up plenty of hits for arduino boost controllers. If you like playing with electronics, a home brew boost controller is easily possible. Mind you, at £99 for a boost controller it might not be worth the bother other than for something to mess around with on cold dark nights.

"If its not broke, whack a turbo on it"

https://www.youtube.com/c/turbominitv

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