How to operate vnt15 controller on 1.6L

[vanbcguy]

That's what my code on the github link there does...

[MocroPlay]

That's what my code on the github link there does...

Do you have This fully and succesfully operational on your car?

And what extra hardware would be needed to have this properly working an IDI diesel since my engine is still stock (only gov mod, boost pin set steeper and K14 instead of K24 for quicker spool)

[vanbcguy]

Yup, I'm fully operational. It's been working quite well. I could probably still get the boost control a LITTLE bit tighter but it's in the "good enough" camp these days.

Extra hardware... You need something to give a TPS signal. I'm using an injection pump that has one on it from the factory but you can probably find something that will work. You'll also need a tach signal. I'm using the TDI crank sensor for mine but there's other ways of doing that.

[MocroPlay]

wow man that's nice, is there also someone with an arduino-controlled VNT on his 1.6TD IDI?

i'm trying to find someone who allready has done this on an IDI with a mechanical pump
to find out if this is doable for me because I don't have much experience
but i'm very very interested in this concept?

[CasaEd]

keep it simple, like its done in Portugal

[libbydiesel]

keep it simple, like its done in Portugal

There are some very good reasons to not do it that way.

[MocroPlay]

keep it simple, like its done in Portugal

There are some very good reasons to not do it that way.

How do you mean Libbydiesel?

[libbydiesel]

Reasons to not do it that way include but are not necessarily limited to excessive back pressure, over-speeding turbo, worse fuel economy and boost spikes when transitioning from cruise to max acceleration.

[libbydiesel]

I forgot, 'fail to damage' in the event of a boost leak. 

[CasaEd]

Can you explain "fail to damage" in the event of a boost leak ? 

[libbydiesel]

Sure.  With just a boost can, if you are at max boost and a hose pops off, boost pressure will drop to zero and the vanes will snap shut causing the turbine to accelerate at maximum acceleration and the turbo will most likely self destruct.  Hopefully you lift your foot off the go pedal when you hear/feel the issue, but with just a boost can operating the vanes, that will have the sole effect of reducing fuel.  With other better controls, the vanes will open as you lift your foot and you are far more likely to escape the situation with a turbo/engine that is intact.  You then reattach the hose and motor on rather than replacing the turbo and possibly a bent rod or four...  Better yet would be code that recognizes a significant disparity between pedal position, rpm and what the manifold pressure reading is currently and what it should be and opens the vanes - limp mode.   

[MocroPlay]

Thanks libbydiesel.

Btw, haven't you tried an Arduino controlled VNT on your IDI? What are your thought on this method?

[libbydiesel]

I have not yet.  I was working on a project very similar to vanbcguy's but did not complete it.  I think it is an excellent way to go and am sure I will use it in the future. 

[CasaEd]

Thanks for the reply, spoke to mate at work about this, he actually had the hose come off at full boost, and yes it lunched the turbo only, Not sure why the con-rods would bend from a turbo hose coming off, only ever seen bent rods from engines which have ingested liquids, but i will bear it in mind and ensure all hoses are well secured,

[libbydiesel]

A common failure mode of the VNT15 is to snap its shaft which then causes pressurized oil to dump into the intake and hydrolock the engine.  Bent rods from failed turbos are not uncommon on the ALH that came stock with the VNT15.