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+--- Thread: Vacuum pump. (/showthread.php?tid=21223)
Vacuum pump. - Dean - 09-02-2014
Am i right in thinking that the vacuum pump sucks more with more load on the engine?
just thinking that if a VNT runs off vacuum, that if more suction is given on load could the vacuum pump that is on the car be ran to alter the position of the vanes, giving that some alterations could be given to the arm.
Or is my lack of sleep just making me talk shit..
RE: Vacuum pump. - Tom - 09-02-2014
I think if it was that easy someone would of done it already...
Although im prepared to be shot down in flames.
RE: Vacuum pump. - Dean - 09-02-2014
I havn't seen anyone do it thats why ive thought about it.
Seems too much of a faff on with a conventional wastegate + MBC. As i know if not done properly it will implode the turbo lol
+ i know that the vacuum pump runs the brakes aswell, and am aware of that.
RE: Vacuum pump. - zx_volcane - 09-02-2014
erm
in a word
no
sorry
but nice one for trying to think out of the box, I'm all for a bit of lateral thinking
RE: Vacuum pump. - Danny2009 - 09-02-2014
I was waiting for you to comment n this tom. Thought it was a good idea but had no clue if it would work or not
Vacuum pump. - Dean - 09-02-2014
(09-02-2014, 10:53 PM)zx_volcane Wrote: erm
in a word
no
sorry
but nice one for trying to think out of the box, I'm all for a bit of lateral thinking
Does the pump itself not give enough suction to work the vnt actuator? Or does the pump itself work at a constant suction?
I know that vnts need at least 15 hg to be on full blow working through vacuum.
As I know that people have used the n75 valves off audi's on some mech controlled rovers, and a pressure valve.
However I have seen a audrino map available for free for mech controlled pumps to work electronically controlled vnts but requires map sensor and tps. Map sensor easy enough but a tps, unlikely.
RE: Vacuum pump. - zx_volcane - 10-02-2014
Loads of misconceptions flying around here
For a start the vac pump runs off the camshaft, so if anything is rpm, not load dependent.
Besides, in your parallel universe, the more load the more vac, the more vac actuator pulls on the vnt lever, the more the vanes close, the more load, the more vac, the more the vanes close, until it all blow up and you end up with oil everywhere and pieces of expensive turbo down your inlet.
Probably time for a big sleep, and then a big read up on how vnt works.
Vacuum pump. - Dean - 10-02-2014
No need to be that blunt, at the end of the day was only asking if it could be done, and yes some research beforehand could of been done. But not everyone thinks like that.
End of this topic then.
RE: Vacuum pump. - Dave - 10-02-2014
(10-02-2014, 12:00 AM)zx_volcane Wrote: Loads of misconceptions flying around here
For a start the vac pump runs off the camshaft, so if anything is rpm, not load dependent.
Besides, in your parallel universe, the more load the more vac, the more vac actuator pulls on the vnt lever, the more the vanes close, the more load, the more vac, the more the vanes close, until it all blow up and you end up with oil everywhere and pieces of expensive turbo down your inlet.
Probably time for a big sleep, and then a big read up on how vnt works.
Lol tom, long day?
RE: Vacuum pump. - Ruan - 10-02-2014
The vanes need to be controlled from a multitude of inputs really..
You want it to be able to take into account the rpm of the engine, so it doesn't apply too much boost at a low RPM or try and close the vanes up too quick at high RPM, causing an overboost situation, but at the same time it be controlled by the inlet mani pressure, so it knows it's setpoint and will hold it there.
RE: Vacuum pump. - zx_volcane - 10-02-2014
(10-02-2014, 01:00 AM)Dean Wrote: No need to be that blunt, at the end of the day was only asking if it could be done, and yes some research beforehand could of been done. But not everyone thinks like that.
End of this topic then.
Sorry Dean, didn't mean to across so bluntly , just trying to work through some of your logic.
I really do heartily encourage you to think about different ways of doing things, and ask a few questions along the way.
There is no such thing as a dumb question, only grumpy bumcakes like me answering them :p