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dmiletics
Samba Member
Joined: October 08, 2010
Posts: 9
Location: Montreal
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 Posted: Sun May 01, 2016 7:37 am Post subject: Megasquirt Bosch PWM idle valve |
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I replaced the stock ecu on my fuel injected 77 Beeltle with a Megasquirt ecu and kept the stock plenum. I have been using a simple on/off valve to control fast idle for warmup but want to change it to a Bosch PWM valve so I can vary idle speed as the engine warms. Has anyone had success with setting up a bosche valve? What Tunerstudio settings have worked for you? Thanks for the help.
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Dale M.
Samba Member
Joined: April 12, 2006
Posts: 20378
Location: Just a tiny bit west of Yosemite Valley
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| Posted: Sun May 01, 2016 8:42 am Post subject: Re: Megasquirt Bosch PWM idle valve |
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Very clean Vert... Looks really good...
Dale
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ps2375
Samba Member
Joined: April 24, 2014
Posts: 2471
Location: Meridian,ID
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| Posted: Sun May 01, 2016 8:50 am Post subject: Re: Megasquirt Bosch PWM idle valve |
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When I had my Rabbit, I used a two wire idle valve and found I had the best results when I used the valve only during warmup. I set the warm idle at what rpm I wanted it to be with 0% duty cycle and that allowed the ecu to only use the valve when the motor needed the extra air and fuel. This allowed me to start the motor in sub-freezing weather w/o touching the throttle and it would idle instantly. Then you can use the warmup analyzer to have it adjust the w/u enrichment from cold to where you have warm w/ 0% enrichment set at.
I had a v2.2 board and it required the TIP120 mod kit for the higher current rated transistor to control the valve. |
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dmiletics
Samba Member
Joined: October 08, 2010
Posts: 9
Location: Montreal
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| Posted: Mon May 23, 2016 6:47 am Post subject: Re: Megasquirt Bosch PWM idle valve |
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I decided to get Mario at the dub shop to set me up with a bosche 2 wire idle valve and he helped me out with the settings in tuner studio and now it works perfectly. Still have to tweak the enrichment settings but getting close.
Mario is the best! |
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raygreenwood
Samba Member
Joined: November 24, 2008
Posts: 21513
Location: Oklahoma City
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| Posted: Mon May 23, 2016 8:55 am Post subject: Re: Megasquirt Bosch PWM idle valve |
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| dmiletics wrote: |
I decided to get Mario at the dub shop to set me up with a bosche 2 wire idle valve and he helped me out with the settings in tuner studio and now it works perfectly. Still have to tweak the enrichment settings but getting close.
Mario is the best! |
Also....sometimes its simpler to make a mechanical solution instead of endless programming variations looking for perfection. The two wire idle valve....is basically off/on.
You can in your programming say when its off and on. At certain temperatures the set air volume is not always advantageous to the fuel mixture your ECU and network is supplying.
An extra simple adjustment to add is a downstream restrictor or bypass screw so you can adjust the VOLUME....that the simple on/off of the idle valve allows.
This is a best of both worlds....somewhere between and old world auxiliary air regulator which HAD adjsutable variability....but no positive on/off related to temperature and a semi-modern two wire idle air controller....which was positive and crisp but rarely do you find one with adjustability.
Short of adding the complexity and expense and then more programming of going to a modern multi step idle air controller.....this simple added tweak may be all yours needs.
This was a common tweak/hack on Mk 2 water cooled golfs etc. with Digifant II injection. If you end up with any mods or upgrades to the system, sometimes the pre-ordained inlet flow level of the simple two wire IAC was in need of change. Ray |
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ps2375
Samba Member
Joined: April 24, 2014
Posts: 2471
Location: Meridian,ID
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| Posted: Tue May 24, 2016 8:39 pm Post subject: Re: Megasquirt Bosch PWM idle valve |
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| dmiletics wrote: |
I decided to get Mario at the dub shop to set me up with a bosche 2 wire idle valve and he helped me out with the settings in tuner studio and now it works perfectly. Still have to tweak the enrichment settings but getting close.
Mario is the best! |
TunerStudio has WUE autotune, a few cycles of that should dial it right in. |
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