Originally Posted by Boost Joose
(Post 860110)
essentially yes....the wheel moves based on rpm/throttle/boost levels
How are we having this discussion when OP doesn't understand what VGT is? |
Omg, OP just went full retard....
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Originally Posted by Boost Joose
(Post 860112)
Yes, surge but a VGT turbo, from my understanding "shrinks to essentially become a smaller turbo for instant responce and then expands as the rpms rise.
re-read what they do. |
Originally Posted by 18psi
(Post 860113)
:facepalm:
How are we having this discussion when OP doesn't understand what VGT is? |
Ha, maybe I am....sorry if I mis interpreted. I'm about to leave but I'll read up more later......:noob:
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Originally Posted by Boost Joose
(Post 860096)
Hey dumb fu(k why dont you learn how to interpret english. "many if not most to all drifters go V8 for the response."
In dumba$$ terms: People in the drifing scene that decide to go from a 4 cylinder to a v8 do so for increased response and convienience of having optimal torque at a much broader range. Can you comprehend that? You're lack of good sense shows in your response. Since I know the schools are slacking in teaching your kids good English and syntax I'll go ahead and tell you what you are trying to say: "Of drift cars that swap a v8, those that do it, do so for the response." Funny how you jump on my for comprehension, and then quote yourself. If you take the time to really pick apart what you typed, you actually said,"most drifters are running v8's." But hey, we all know comprehension isn't your strong suit. |
Originally Posted by Boost Joose
(Post 860110)
essentially yes....the wheel moves based on rpm/throttle/boost levels
you do know there difference between a compressor wheel and turbine wheel right? and you do know that surge has everything to do with the RPM and PR of the compressor wheel right? and you do know that if you spin the turbine faster/earlier, the the compressor wheel also spins faster and build boost sooner, possibly building boost to the left side of the surge line and becoming very unstable? |
Wait, BJ is a drifter?
....Well played sir, well played. |
Originally Posted by Jeff_Ciesielski
(Post 860114)
Omg, OP just went full retard....
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Originally Posted by 18psi
(Post 860093)
What a lot of these kids don't understand too is our motors can't even CONSUME the 25psi or whatever it is, from a large turbo, at 2500rpm.
Stick a 30r+ car with mbc set to 25psi in 5th gear at 2k rpm and go W0T. See how much surge you get. Ask me how I know 18psi please tell how a 30r+ could see 25psi at 2000rpm in 5th? On a miata motor Without flat shift or any tricks. Even with the best fuel i am not sure it is possible. |
It wont, obviously.
It will try, and surge like a motherfawker. This is me in a 3076 miata on e85 running *ALL OF IT* in 5th gear at low rpm (filming buddies bp-t festiva vs skyline) he wasn't even flooring it at all, and listen to how bad it surges. when he got on it at 2k (different time) it sounded like a friggen sprinkler head and car was shaking violently. |
So wait is the lack of exhaust flow/low rpm that causes surge or what exactly...
I know it's not enough rpm on the compressor but say we do find a way to keep it spinning... then what? |
Originally Posted by triple88a
(Post 860334)
So wait is the lack of exhaust flow/low rpm that causes surge or what exactly...
I know it's not enough rpm on the compressor but say we do find a way to keep it spinning... then what? Surge is when you have high pressure and low mass flow out of the compressor. If you look at a compressor map, it is basically when you go to the left of the surge line on the map. It happens when the turbo is spinning fast enough to deliver more air than the engine can take in. |
Originally Posted by Rara
(Post 860337)
No, I think you've gotten a bit mixed up on what surge is.
Surge is when you have high pressure and low mass flow out of the compressor. If you look at a compressor map, it is basically when you go to the left of the surge line on the map. It happens when the turbo is spinning fast enough to deliver more air than the engine can take in. Wikipedia takes this mostly in terms of a jet turbine engine, but the concept is the same. http://en.wikipedia.org/wiki/Compressor_stall It looks a lot more violent in airplanes. |
Originally Posted by Bryce
(Post 860344)
Which causes a breakdown of the airflow through the compressor. Its like an airplane wing stalling. The compressor is a wheel of wings.
Severe surge can potentially damage compressor wheels pretty badly too. |
antisurge housing ftw
the big bitch in my avatar never surges. |
If you've never experienced it, compressor surge is pretty horrible.
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Soooo we need something to allow some of the flow to escape so the turbine can spin at a good rpm?
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Originally Posted by triple88a
(Post 860374)
Soooo we need something to allow some of the flow to escape so the turbine can spin at a good rpm?
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Originally Posted by Boost Joose
(Post 860099)
The point of these VGT turbos are to have a small turbo at low RPM(like a 2554) and the flow and power of a big turbo in high RPMs(like a 3076)
No, no, no... If that's how they worked it would be the magic bullet. It strictly helps spool. The solution you want is right above... How come I feel I'm wasting my keystrokes? :dunno: |
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