Recent Posts

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General Discussion / Re: HE351VE on 1987 BMW (gas) - inspired by lilbb!
« Last post by Rx7man on June 08, 2020, 09:24:27 AM »
I let mine use the whole range, even though it may not be doing very much opening wider than 140.. It may also depend on the size of turbine you have, perhaps on a 60mm, the turbine exducer becomes the flow limiting factor, but if you go to a 67mm, that's no longer the case?
I showed my buddy your video, he is a beamer fan too (until I convinced him to get a dodge/cummins)

one reason I let mine use the whole range is to keep the vane sliders clean and not let too much soot build up on them, on a gasser it's probably not as important though
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General Discussion / Re: HE351VE on 1987 BMW (gas) - inspired by lilbb!
« Last post by mantonakakis on June 03, 2020, 12:18:54 PM »
correct, the feedback is essentially how hard and in which direction the motor is working, temp is usually pretty close to your coolant temp if you have that plumbed up
Cool, got that working now, I was curious if there was any big error between command and actual - at least driving around a bit yesterday, they follow pretty tightly. Both are getting logged to the Megasquirt now (previously I was only logging the position command I sent, but now I'm logging the received command position as reported by the turbo, as well as the actual position).

One other question - in some other forum thread circa 2014, someone was posting that a command position of 140 or so was the actual usable most-open position, even though the vanes will still move down to about 50 or 60 (which is where I have my limit set now). Any advice on whether it's worth changing that max limit to 140?
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General Discussion / Re: HE351VE on 1987 BMW (gas) - inspired by lilbb!
« Last post by Rx7man on June 03, 2020, 12:56:43 AM »
correct, the feedback is essentially how hard and in which direction the motor is working, temp is usually pretty close to your coolant temp if you have that plumbed up
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General Discussion / Re: HE351VE on 1987 BMW (gas) - inspired by lilbb!
« Last post by mantonakakis on June 02, 2020, 09:57:09 AM »
Okay, did my first test last night with the compressed air. Wastegate is staying shut now, when my MAP gets within 10kPa of my boost target I vent the solenoid, otherwise it's pressurizing the wastegate dome to ~35psi. One weird thing I noticed is significantly lower wheel speed - I'll have to do a back-to-back test to compare for sure, but usually I'm at 80k-90k once I'm spooled and around 180kPa MAP. After the wastegate change I'm seeing more like 65k-75k with all else mostly equal except altitude - my last testing at the current boost level was 85kPa ambient pressure, last night was 80kPa; pressure ratio was higher last night, but turbo speed decreased???

EDIT: Must have been a fluke, maybe bad data or something? I just went for a quick test drive and the speeds are back to normal, mid 80k's.

In any case, I want to try an capture and maybe log the messages broadcast by the turbo - I see in the lilbb code there is command and actual position (makes sense), but also feedback and temp? Is that the controller's closed loop feedback and the actuator temperature?
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v1.0 - v1.1 / Re: My life, My coding
« Last post by Rx7man on May 31, 2020, 12:45:32 PM »
My new VGT code seems to work, though I havne't had the truck insured so I haven't really put it through it's paces..

Working on a transmission lockup/OD box.. OD in my first gen has been acting all goofy, I'll see how it works out... trying to print my own board with toner transfer has caused me to lose a lot of hair and sanity!.. It looks like total garbage but I think it'll be good enough for a test run.
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General Discussion / Re: HE351VE on 1987 BMW (gas) - inspired by lilbb!
« Last post by Rx7man on May 30, 2020, 04:25:22 PM »
nice, looks like the turbo is in a pretty happy place too!
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General Discussion / Re: HE351VE on 1987 BMW (gas) - inspired by lilbb!
« Last post by mantonakakis on May 27, 2020, 12:32:00 PM »
you probably don't need a whole lot of pressure from it,  have you measured your exhaust pressure?  I'd say if it's at about your peak exhaust pressure it should be fine
I'd probably try and make a system so it's got a holding tank fed by exhaust pressure and a check valve in it to hold it there,  I'm a cheap ass
Haven't measured the exhaust pressure, been thinking about it but I don't really feeling like taking too much apart at the moment. I could probably tap into my wastegate feed tube pretty easily, it's stainless and welded to the turbine housing. But no real downside to running a lot of pressure. I use a JGS wastegate that is a piston/o-ring design, not a diaphragm, so it should be able to take lots of pressure (they're tested to 40psi, so I'll probably start there).

The compressed air setup wasn't very expensive, $130 for the whole kit with compressor, tank, wiring, mounting kit, etc. I don't have a ton of room under the hood, either, and knowing myself I would complicate an exhaust-pressurized system needlessly to get it routed to the trunk. And now my e30 can have air horns, too!

Flyby vid from the other day, I overlaid some gauges to show the turbo in action. These pulls were around 4500-5000' elevation, 85kPa ambient air pressure. The boost gauge is scaled to sea-level gauge pressure (i.e. 0psi on the gauge = 100kPa absolute = sea level ambient pressure).
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General Discussion / Re: HE351VE on 1987 BMW (gas) - inspired by lilbb!
« Last post by Rx7man on May 25, 2020, 02:00:06 PM »
you probably don't need a whole lot of pressure from it,  have you measured your exhaust pressure?  I'd say if it's at about your peak exhaust pressure it should be fine
I'd probably try and make a system so it's got a holding tank fed by exhaust pressure and a check valve in it to hold it there,  I'm a cheap ass
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General Discussion / Re: HE351VE on 1987 BMW (gas) - inspired by lilbb!
« Last post by mantonakakis on May 21, 2020, 06:52:20 AM »
I went ahead and ordered an on-board air compressor and another boost control solenoid (already have one on-hand that I used with the old turbo). To start with, I'll do a pretty simple control with hopefully just a single solenoid that applies the full regulated pressure to the top of the WG until I get close to boost target, at which point I'll vent it fully and let the MBC control the boost. Hopefully that'll get it spooling harder!
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General Discussion / Re: HE351VE on 1987 BMW (gas) - inspired by lilbb!
« Last post by Rx7man on May 20, 2020, 08:57:09 PM »
Nice!
I'm trying to convince my buddy to put an HE351 on his FD Rx7 (My old car)