TTC

So does that mean you don't use a restrictor in the oil feed line?

Comparing to holset hy35: Just to get an idea of wheel size

compressor:
ind:2.306'
exd.330

Turbine:
ind: 2.272'
exd:2.551'

SiFlyBy

No, I dont have a restrictor in the feed line. I am having some doubts as the whether or not my engines oil pressure is adequate for proper lower RPM control. I think I'm going to put some washers behind the oil pressure control valve spring and see what I can get out of it. right now I dont have much more than 10 psi at idle and it doesnt go past 30 psi at higher RPMs even cold...

aero

That is really low. I wonder if that is why romping on it at higher RPM causes boost to come in much slower. Insufficient volume/pressure to rapidly move the piston.

SiFlyBy

It sure isn't helping matters. but the reason its like that is because of the taper in DC that I have in the map at higher RPMS for boost control. Now with the wastegate, I can just command it close to full and let the WG take care of extra boost.

b18.

What happened with your wastegate actuated setup?

aero

That past was about his Garrett VNT setup.

Mine is staying with the WG actuator, the car doesn't run though from the spun bearing at ~1000 miles. Still waiting to pull the motor and send it back to the machine shop to fix their mistake.

bitchM0VE

Hmm. I'm almost smart enough to tell you what circuit you need and how to build it, but not quite.

You can setup MS to output a PW modulated by TPS and load. You know that. Then you need a couple other little things to change that to what you need, which is current as a function of those variables.

Need to get on msefi.com and talk to some people over there. There's a few that are smart enough to tell you what components to use to make this happen. It's probably gonna be something that looks at PW and varies resistance based on it, and that referenced to a votage regulator that's moded to be a current regulator.

HiProfile

I'd just go the "who gives a ----" method and just deal in abolutes. Zero duty, 50% duty, full duty. Maximize spool with it at zero, switch to 50% at a medium boost level, then full when you hit full boost.

IIRC Aero you said even with your hosing 100% open, boost was still rising? From a very rough scientific point of view, diesels don't produce as much exhaust volume at full throttle power vs gasoline PER LITER. Most diesel engines also suffer from terrible V.E., if you can call it that. Only very complex direct-injection systems make decent exhaust flow at higher rpm.


Can you provide any details on how much faster it spools than a conventional setup??

SiFlyBy

I have tried to poke them on msefi a little. There are very few people interested in this VGT ---- right now though. I have a computer-wise friend looking into the control for a better solution...it will be an ever-evolving project.


ON mine I can get about 5psi in 2nd gear at 6200 rpms with no control, 0% DC, vanes open. with the vanes commanded to 85%, fully closed, I can start making boost at about 2000 rpms, 10+ psi by 3000 rpms and it goes crazy after that, also in 2nd gear.

S

aero

Here is how mine spooled. It is in 4th gear. It is a bit faster than the HX40 I had in the small BEP housing before. Not quite as much as was thinking do to the higher gear, but still faster. I need to find my logs from the Hx40 again to post side by side.

Yes it is a 2.4l. 8-8.3:1 compression.

Here were my initial spool results with the VGT rack fully closed and fixed there. This is just the first log I opened.
Here are the the most important things affecting spool
4th gear
8" of 3" pipe for an exhaust
No intercooler
E85
8-8.3:1 compression
stock head, cams, intake manifold
Fairly low timing
1800 1psi
2000rpm 3psi
2500 8psi
2600 10 psi


Its a little slower now, the actuator starts to open the thing up a little sooner than I'd like.