Ok,
This is out there, but I was thinking about turbos last night (needed something else to think about besides the upcoming wedding....TWO WEEKS)and I keep falling back to the VNT units and the possibilities, obstacles and setups that exist out there right now for mechanical control...or use of the stock VNT unit on the mTDI setups....
So...what we have thus far is...
1. There is an elusive mechanical control diaphrapm out there from older VNT setups...I have yet to had luck finding one...not to mention, would it work with our nicely sized VNT 22, 25, etc. that I'd be looking at for my setup?
2. We have the flipped acutator mechanism that Jake did on his dad's TD IDI 1.6 for mechanical control over the VNT 15 that was installed on his dads car. It worked, but did have some issues with its operation right? Wasn't "linear" or "constant" sometimes in how it pulled the vanes, etc.
3. We have Martins very nicely setup linkage for his VNT20...looks to work very SLICK! However, when a larger intake manifold is involved...it makes such a setup hard to work with and such...
Did I miss anything?
So...what was I thinking about last night? Well... came home for the weekend to spend with my family and we were out to dinner. My dad has a few Fords around here..namely a Taurus and a Crown Victoria and we were crusing to dinner last night and I got to thinking about the cruise control setup on the Fords (and many cars for that matter) and how you can "accel" at the push of a button, de accel, etc. all based on a vac. operated system. (got to thinking about the cruise setup in my b3 variatn from there with its vac. acutators, pedal diaphrapm linkage, etc.) Also, most cruise control setups operate on a seperate control module to...so, with some independence from the ECU.
I haven't thought about it much beyond that at this point, but I was thinkin about whether a cruise control setup couldn't be modified for use in controlling the VNT turbo designs on our mTDI setups. I was going to play with the idea some more...but don't know...just a random thought.
Throwing it out there...not much behind it yet though...
Joe
I too have wondered if a crusie control would work to control a VNT. But i'd be worried that it wouldn't react fast enough. Thats not saying it wouldn't work.
Good idea to use the principle of the "speed" cruise control the car, and convert for "PSI" boost control the turbo :lol:
But,to control electronically the VNT turbo, that takes TPS sensor, RPM sensor, and Boost sensor, but, the most important for the VNT it's the TPS, when us control mechanically the VNT, the mechanical linkage act like a TPS, and mechanically, the pressure actuator act like a cruise control to adjust and maintain the desired full boost, when it's reached..., if the full boost is not reached, it is only the linkage which control the boost in proportion to the accelerator.
I had found this, but it's expensive:
http://www.sportcompactcarweb.com/tech/0207scc_a_pexi_avc_r_boost_controler/ http://cgi.ebay.com/ebaymotors/APEXI-AVC-R-AVCR-II-ELECTRONIC-BOOST-CONTROLLER-BLACK_W0QQcmdZViewItemQQcategoryZ33742QQihZ010QQitemZ200126452585QQrdZ1QQsspagenameZWDVW
some day my TDI will be in my caddy
I have a GReddy Profec to put on, I figure if I turn the gain up, it'll respond really fast. It'll take alot of trial and error to get everything tuned right, but I think they can run them just fine.
while not electrical,
what I am doing on my Variable gate IHI is to have a wastegate actuator that pushes my gate control and I am bleeding pressure off of it with a spring loaded ball valve so that I dont open up to soon. I need to fine tune it since I dont want to run more than 25 psi since my turbo surges there but so far its getting better I just need a stiffer spring against the ball since I am out of adjustment.
hope this helps
Later
Justin
Tintin would you use the controller with the vacum actuator modified to run on boost?
Tintin would you use the controller with the vacum actuator modified to run on boost?
I use pressure regulator.
Tintin would you use the controller with the vacum actuator modified to run on boost?
I use pressure regulator.
back to basics. i love Tintin's mechanism. because the vanes are actuated by your foot, they are getting a lot of movement, which helps them from sticking. another problem that just using a pressure regulator has. if you don't reach peak boost all the time, then the vanes aren't actuated, and when you actually do reach the boost level, the vanes are all gummed up and don't work (so the turbo spikes...)
if you did electronically control the vanes, it would be a good idea to insert a system to actuate the vanes (fully) a few times when the car is started, or shut off. to help the vanes from seizing up.