Author Topic: Boost Control  (Read 776 times)

Offline MadsF

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Boost Control
« on: May 08, 2017, 03:50:31 pm »
Hi

Can VEMS control boost pressure like a e-boost2? - or do i have to buy a e-boost2?
 
I need to be able to run on different boost pressures. I have a 3-way solonoid, but i think i maybe need a 4 port to run different boost pressures?

I use a 50 mm HKS copy wastegate and i am going from 24 psi to 30 psi soon, so i would like to be able to control it.

VEMS V.3.8

*I know more people would like to figure this out.
« Last Edit: May 08, 2017, 04:24:37 pm by MadsF »

Offline Sprocket

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Re: Boost Control
« Reply #1 on: May 09, 2017, 04:35:46 am »
There is a whole menu in Vemstine called 'Boost Control' and two separate boost control outputs infinitely configurable and can be affected by Anytrim settings also.

I'm using a 10 position rotary switch  with 1k resisters in series on Anytrim 2 to change the boost target in the primary boost control. Boost target is variable from 150kpa to 260kpa in ten discrete settings simply at the turn of a knob.

No idea what e-boost is ???

Offline MadsF

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Re: Boost Control
« Reply #2 on: May 09, 2017, 02:23:21 pm »
Okay, thats nice. So with your 10 position switch you can run og 10 different boost levels ?

I'm still very new to this, but got the car running great. Arround 300 bhp, but im only running spring pressure, so could be awesome to be able to control the boost pressure in both directions.

Thanks for your help. I'd like to see your settings if it isn't to much of a effort.

Offline gunni

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Re: Boost Control
« Reply #3 on: May 09, 2017, 11:19:42 pm »
Have a look here at my comments on VEMS boost control.

http://www.e30tech.com/forum/showthread.php?t=13687&page=9

Offline MadsF

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Re: Boost Control
« Reply #4 on: May 10, 2017, 02:12:46 am »
Hi gunni, where do i find it? Links leads to LCD discussion.

Offline gunni

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Offline gunni

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Offline MadsF

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Re: Boost Control
« Reply #7 on: May 10, 2017, 05:38:32 pm »
Thanks. I'll take a look.

Offline MadsF

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Re: Boost Control
« Reply #8 on: May 11, 2017, 01:26:29 pm »
Thanks you gunni !

This was the bit i needed:

"After you get the PID values right then by testing using the Boost target curve you can add on the anytrim table that adjusts boost target based on
a 0-5v , this can be used to multiply the target or add on to the target, I use addition so at 0v I add on nothing, at 5v I might be adding another bar on top. So when you wind the knob back the target is usually wastegate pressure , say 150kpa, at the other end the target is 250kpa. "

What switch/pot-meter do you use on the anytrim 0-5 v ?


Copy/paste from vems.hu

Anytrim trim capabilites per channel:

Anytrim 1: fuel, lambda, cranking pulsewidth, launch rpm(add)
Anytrim 2: fuel, lambda, cranking pulsewidth, boost target(multiplicative), boost target(additive), boost reference DC (additive)
Anytrim 3: lambda, spark, cranking pulsewidth, adjustable fuel-cut rpm(add), redline rpm (add)
Anytrim 4: boost target(multiplicative), boost target(additive), boost reference DC (additive), adjustable fuel-cut rpm(add), redline rpm (add)
Anytrim 5: spark, launch rpm(add), adjustable fuel-cut rpm(add), redline rpm (add)
The different trim functions are able to scale the variables within the following range:

Fuel trim: from 78 % to 178 %
Lambda target trim: from 57 % to 141 %
Cranking pulsewidth: from 0% to 697%
Launch rpm trim (additive): from 0 RPM to 25500 RPM
Boost target trim (mult): from 0 % to 199 %
Boost target trim (add): from -256 Kpa to +254 Kpa
Boost ref DC trim (add): from -100 DC% to +100 DC%
Spark trim: from -32 Deg to +32 Deg (positive is higher ignition advance, negative is retard)
Adjustable Fuel-Cut rpm trim (add): from -8192 RPM to +8128 RPM (redline rpm hard and soft unaffected)
Redline rpm trim (add): from -12800 RPM to +12700 RPM (both hard (fuel/ignition) and soft limit (ignition) adjusted with the same offset)
Lambda, Launch and Cranking pulsewidth can trimmed by only one Anytrim control at the same time (if you enable it multiple times, the first function will take action).

What anytrim should be used adjusting boost target, 2 or 4 ?
« Last Edit: May 11, 2017, 06:31:04 pm by MadsF »

Offline gunni

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Re: Boost Control
« Reply #9 on: May 12, 2017, 02:18:57 am »
i always use additive , so either 2 or 4,
I also use a 0-5.7K Ohm fully variable pot, but realistically most pots will work.

Offline MadsF

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Re: Boost Control
« Reply #10 on: May 14, 2017, 04:06:09 pm »
Thank you very much !

Just ordered a few pots. Hopefully i can get it to work.  :D


I've ordered a 0-4,7 k ohm and a 0-10 k ohm. Love eBay.

Now i go try to figure how to wire everything up.
« Last Edit: May 14, 2017, 04:11:27 pm by MadsF »