Holset VGT 5VZ-FE turbo build

Thanks! I've read you build a few times and it was a good inspiration/bad influence .

My initial setup with the breathers was just to get the thing running and shakeout the mechanical side. Here's my breather setup plans/progress:


In order to allow the valve cover breather to take in metered air under vacuum (to keep fuel trims happy), but not see positive pressure under boost, there needs to be some sort of valve. I found a PCV solenoid from some Yamaha motorcycle for $12 shipped on eBay to try out.

From testing, the port on the bottom right shuts when the solenoid is powered. This line will go to the intake right after the MAF.

The other lines are interchangeable and will go to the valve cover breather and the coalescing filter (see below).



Mounted:


Line from valve cover breather


So under vacuum, the solenoid will be open, and check valve sucked shut, so metered air can move into the crankcase. As soon as boost hits, I'll have the Arduino kick the valve shut, at which point the vapors won't be able to get into the intake and make a mess, but will push open the check valve and go into this Racor coalescing filter. Works way better than all the expensive aftermarket air oil separators.



Mods to IC pipes: The BOV works better when it's closer to the compressor, so I move the BOV to the hot side charge pipe. A fitting for the aforementioned post MAF breather is also shown, along with a support tab to keep the piping from flopping. I also rolled beads in all the pipes.





So is this getting too complicated of a project? Yes

 

Nice man; looks like you got it figured out. I did a cheap 10$ "catch" can and filled it with stainless steal wool to help precipitate the oil and crap. Not the best design but about as good as the $100 cans; still get some vapors though.

 

Well, it looks like I might need a wastegate after all. Even with the vanes fully open, the compressor speed still flies past my max of ~60000 under WOT. I think the nozzle area is sized to limit the turbo speed somewhere north of 100k. Since I don't want to run that fast, I'll need another way to regulate the turbo speed. At least that makes the code easier

Otherwise I've got the GM map sensor hooked up, as well as the PCV solenoid. I've got the code working to shut the PCV as soon as there's positive pressure. It works really well actually.

 

Quick video with the vanes closed. No trailer this time.

 

That pretty wild trying to only use the vanes to control flow of the turbo. How much tps you try to command until you decided it's time for a wastegate. You take the motor to near redline at part throttle?

 

That turbo is so big haha. So you get peak boost at 4k? Love the build read through the whole thing i would have gone with an 18g or a smalle turbo but i dont have the money or knowledge! Good luck sir

 

Full boost is around 2500 in first gear, the progressively lower in higher gears. It's basically instant for all practical purposes.

 

so thats the vanes closed as in fastest spool possible yes?

Pretty nice.

still curious on the tuning of the VGT though with the andrino.

And you'll need an external WG after all because with the vains open all the way there is still positive boost?

 

Seems a few people done understand how a VNT style turbocharger operates.
With that map, that turbo once you figure out regulation should fit nicely with room to grow later when your bored with 300whp..
I've seen the exact same turbo used with an inline 6 BMW.. He had some sort of custom computer setup for the vane controller.

Are you running solid or oem style engine mounts?
I mounted my intercooler at an angle (ground clearance) and it gave me a little more frontal area through the valance.

 

Haven't seen this guy in a while. ^^^

 

For that vane system, if you know someone who can program Linux, you can probably use a

CanaKit Raspberry Pi 2 (1GB) with Premium Black Case

Raspberry PI to control the vanes.

 

He's using an andrino. Should be simple enough. I just wanna know how the program does it.

 

Not familiar with the Arduino

 

It reads an input and with programming it dictates vane adjustment. I'd guess throttle position and rpm inputs would be where I'd source.

 

wuddup mofukka!
Seems this sites the new ct.
This site is lightening fast compared to that one.

 

Boosting and Forum surfing like usual.

 

subbed for more, badass build so far

 

The arduino is an open source micro controller than can be used for almost anything imaginable. The turbo communicates via CAN protocol so it's pretty simply to control the position in an open loop. Closing the control loop with other sensors is the tricky part.

 

This is my goal as far as inputs. Throttle is easy to read, just a 0-5v input that gets converted to a 0 1023 value from the ADC. A low pass filter is also kinda necessary for that since it's a noisy signal. Rpm is a little trickier since you have to read the pulse rate sent from the ECU to the tach. It's all doable with time.

 

Maybe just a boost reference would be good way to program the vanes. A lot of water/meth controllers work off just using only a boost input. Tapping into MAF voltage would be a good reading too. RPM and throttle position would be hard to work with.