It can, since its a pwm solenoid

I can control travel through the pulse width sent to the solenoid, kinda like an idle air control valve.

I've already talked to BMW and that's how it works and why it is where it is.

They use that motor to limit throttle opening based on wheel speed, wheel spin and rpm. So it can't just open or close, its movement has to be controlled.

 

I also saw a video of someone controlling a vgt system on some random car with an rc servo and microcontroller. The system used oil pressure and basically a ball valve to control flow/pressure... so with the servo closed, no pressure, vane closed... servo opens the valve (however much is programmed for a given input) pressure increases and the vane opens. Apparently it was an OEM turbo and vgt system, he just wanted to control it better.

Maybe I can incorporate a small hydraulic cylinder with two small servo controlled valves to control vane position, that way you could control vane travel regardless of engine load (as in you don't need boost pressure to open the vane)

It would simply need two small microcontrollers setup to receive a 0-5v signal to control position... and each cylinder input would need some sort of drain back system so when you apply pressure to the other side, you aren't fighting pressure... I think 2 small, simple hydraulic dump valves could handle that without issue

I'll have to do some hard research as I just randomly clicked on the video and it got me thinking. Of course the size of the cylinder (they make them pretty small these days) as well as the needed valving, lines, controllers, etc might make packaging an issue... but it could be more reliable in the long run vs an electric actuator and potentially easier to program/tune

Like I said, just a thought.

 

I just bought a h1c I was wondering if all the housing are interchangeable mine has a 16cm housing I wanna buy a 12cm....I found one for 140 new I just have no idea if there all the same or if they need machine work thanks

 

Yeap, need more tuning and better oil drain.

DD it for most of last year as is.

I do not have dyno number, I have to drive 250+miles to the nearest one that is not setup big diesel riggs.

 

Also Ive looked through a lot of the pages does anyone have any first hand experience with the .70 bullseye exhaust housing on a h1c/hx35 model on a bseries ......I'd like some Idea on spool time ....right now I have the 16cm and I'm not sure if it will spool it or not thanks for any advice

 

Not sure on the. 70 housing but the 12cm bolts right on. My h1c came with a 18cm found a 12cm on ebay bolts right up. On my ls the 12cm spools about 3k full by 4800 or so. I would like to try the .70 housing also.

Anyone have a bad hx40? Just want the comp housing wheel and backing plate?

 

How do you plan to compensate for the variable volumetric efficiency that the variable turbine will produce? Speed density systems rely on the fact that VE does not change for a given load and rpm.

Or will your control system be more basic? If load and rpm equal X then vanes should be the Y position?

 

does anyone have a hx35 for sale or any holset for a decent price? Looking for a budget turbo for my rod/piston gsr looking to make 420-430whp on 93 pump.

 

Ok im gona buy a holset HX35/40 hybrid.
It comes with the big 60/86mm compressor 60/70mm turbine wheel(Its like HE351CW)
It also come with t3 12cm divided housing.Im thinking of using it with an OPEN t3 top mount manifold i allready have.
How bad is the 12cm housing spoolwise in comparison with a .63 a/r?This will go on my B16.
Target 450 whp.

Thanks.

 

I start making boost around 2800 and full boost about 4500. Hx35 12cm 3" charge pipes. Splog manifold on a lsv with 8.5:1 compression 28lbs of boost on pump gas.

 

At first if will be simple, as you stated rpm/load control, however I'm trying to use shaftspeed and turbo manifold back pressure as a means of control as well, so the vanes stay open under cruising/low load conditions to preserve fuel economy and lower EGTs.

Since no one has attempted such a control method it will require a very steep learning and adaptation curve... since if something in the programming doesn't perform properly, I'll have to be quick to solve the issues they present

Once I get the basics down, I'll start to see how the ever varying VE influences things like performance, economy, tuning, etc. I'm using an AEM ems and plan on utilizing the auto tune features for the fuel map heavily at first, so the ecu can attempt to build and constantly control the fuel values while we get the vane control dialed in

 

I agree any difference is significant, i ditched the log for my mini ram putting everything together at the moment. This is in on an SR20

 

whats your build plan for the sr? ( I have 5 at the moment lol)

any holset will really shine, not only because of displacement but because of trans gearing, etc

im debating using one on my current sr build as well, since I was given the manifold off the 240RS Maxi, which is divided.

my advice is do a little bit of head work, the sr's weakest link are its ports (and cams) personally I have a set of tomei 280s and solid lifters for my motor plus a port job in the works

 

tomie cams its a GTIR in an NX, mild build Eagle rods wiseco pistons 9-1 comp. ID1000's and I'll be using an AEM EMS-4 and an hx35W

 

I'll be eventually going with a VE head probably next year

 

The VE heads are nice but what makes it costly are the intake manifolds... also, no one makes any cams for the VE head, yet... so you might want to pick up some N1 cams when you decide to do the head

I would talk to mazworx and Dent Sport Garage, they both actively use the VE heads and have worked all the kinks out when using a DE(T) bottom end. They also have the N1 cams as well


How big are your Tomeis? I have 280s for my SR with Tomei solid lifters, also Dent Sport Garage was gracious enough to give me the pimp turbo manifold off the 240RS maxi (divided t3, individual lambda sensor bungs in each runner, EGT bung in each runner as well) so im currently playing around with turbo ideas

I also managed to snag a set of GTI-R ITBs (FINALLY!!!! after years of searching) that were already converted for RWD use (going in my S13) how do you like the throttle response?

Im going to take them apart, clean up all of the casting marks and such, modify the plenum inlet to enlarge it to 3". going to mildly port and polish them as well... if you look where the butterfly is, theres a huge step down on both sides on the butterfly, going to try and even it all out.. Might also enlarge the ITBs and make bigger butterflies

Plus I've got some trick ideas about my fuel system that will require plenum mods or an all new plenum, not sure yet.

I'm very curious/interested about your project, plus I've always had some weird liking for NXs lol. please keep us all up to date.

 

I have 280's as well

 

what are your power goals/purpose for the car?

they might be too big for your goals and they shift the powerband much much higher in the rpm range, so you'll hate them on a daily driven car... but a road course car that operates constantly in the higher rpm range will love the 280s

dont forget once you go ve, everything must be swapped over, except for the turbo manifold.... intake manifold, cams, fuel rails, etc. all wont work on the VE head

 

It will not be a daily driven car and in regards to the Ve head some small modifications will be needed to make it fit. Nothing really major. As far as power goals not sure just want to see where the Holset will take me but I will upgrade that as well

 

Double post sorry

 

well my car is finally ready to put down some numbers! should have some by the end of week. heres a little background info, built lsvtec with pro1's and an hx35, rc 1000's and tuned on hondata. going to push it and see just what this thing can do! hoping for around 375~ on pump gas and then get an e85 tune to see what i can put down on the corn

 

here is my hx35 E85 powered s2k
12cm housing
on 7lbs now untill i get on the dyno

 

^^^^^
SWEET!!!!!

 

So there's been a few replies on youtube about my vgt concept

But I just snagged a pneumatic vgt actuator off the larger he43ve for 12 bucks.

Should simplify the system a great deal

 

SICK S2K!!!!!!!!!!!