hahah ya. Half the time I forget to cancel it manually and with how loud the car is I never hear it clicking. People are probably like, "look at this idiot with this turn signal on"
I just need to re-attach the cancelling tab (it snapped off). Thx though
Seems like my clutch grabbing ability is right on par with the spring in my wastegate... 1.5bar is right about where things start to slip... I'll give it more usage but with gentler use...
Still boosting 30+ PSI connected straight to the IM. The good news is that the clutch is holding long enough at that pressure level that it's exposing other little weak points...
That's far too much spring pressure. Like I said above, you have an equal length header and a non-restrictive turbine housing and exhaust, you don't have much back pressure. I have only one spring in my gate, not sure of the color but it's one of the larger diameter ones, I'm guessing the black one. That gets me 25-28psi spring pressure depending on gear. I'd prefer less, I'll have to see if they supplied anything softer with the gate.
You can't rely on that chart to tell you how much boost a certain combination of springs will provide on your application.
EDIGREG wrote:You can't rely on that chart to tell you how much boost a certain combination of springs will provide on your application.
I would have totally relied on a supplied mfr. chart. What's the best way for the n00bs among us (read: me) to know/figure out the right spring then, install and monitor via gauge? Get some weights and measure the spring constant? lol
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|| 2010 Golf Sportwagen TDI /// #farmenwagen || 2002 Dodge Ram 2500 24vt 4x4 #bertancummins || 1992 80 quattro 20v /// Eventual AAN'd Winter Sled || 1990 Coupe quattro /// Because Racecar
Well... see now, the wastegate spring is fighting manifold pressure, which is NOT related to boost at all. So a 1 bar spring =/= 1 bar of boost. As in Ob's case, 1 bar of exhaust manifold pressure translates to 34 psi boost. So that spring is keeping all the exhaust up to 1 bar of pressure flowing into the turbo, NOT out the wastegate. See what I'm saying?
Matt
18 Silverado 1500 work pig, roof rack and tonneau cover 11 Jetta sedan TDI DSG, rear muffler delete GONE :( 87 4ktq - 4 FOX SNAKES
chaloux wrote:Well... see now, the wastegate spring is fighting manifold pressure, which is NOT related to boost at all. So a 1 bar spring =/= 1 bar of boost. As in Ob's case, 1 bar of exhaust manifold pressure translates to 34 psi boost. So that spring is keeping all the exhaust up to 1 bar of pressure flowing into the turbo, NOT out the wastegate. See what I'm saying?
To take this further, we don't even care about "out the wastegate" so much as out the compressor. The chart assumes a 1:1 ratio of manifold back pressure to boost.
chaloux wrote:Well... see now, the wastegate spring is fighting manifold pressure, which is NOT related to boost at all. So a 1 bar spring =/= 1 bar of boost. As in Ob's case, 1 bar of exhaust manifold pressure translates to 34 psi boost. So that spring is keeping all the exhaust up to 1 bar of pressure flowing into the turbo, NOT out the wastegate. See what I'm saying?
Right, but there is no way to determine the relationship between EM and IM pressure besides trial and error (ok, maybe a very very complex formula which would include a backpressure calculation)
EDIGREG wrote:You can't rely on that chart to tell you how much boost a certain combination of springs will provide on your application.
I would have totally relied on a supplied mfr. chart. What's the best way for the n00bs among us (read: me) to know/figure out the right spring then, install and monitor via gauge? Get some weights and measure the spring constant? lol
trial and error!
The manufacturers chart is helpful for blowoff valves, wastegates not so much
chaloux wrote:Well... see now, the wastegate spring is fighting manifold pressure, which is NOT related to boost at all. So a 1 bar spring =/= 1 bar of boost. As in Ob's case, 1 bar of exhaust manifold pressure translates to 34 psi boost. So that spring is keeping all the exhaust up to 1 bar of pressure flowing into the turbo, NOT out the wastegate. See what I'm saying?
Right, but there is no way to determine the relationship between EM and IM pressure besides trial and error (ok, maybe a very very complex formula which would include a backpressure calculation)
Exactly.
Matt
18 Silverado 1500 work pig, roof rack and tonneau cover 11 Jetta sedan TDI DSG, rear muffler delete GONE :( 87 4ktq - 4 FOX SNAKES
This is a very good point that I never thought about. I had the same problem with my HX52 on Hank's manifold. I think I had a 1 bar setup in it, but it would spike to 25 and then hit boost cut with no sign of wastegate opening. I guess that combo just flowed too well for the wastegate to open
-Chris
'91 Audi 200 20v - Revver/BAT project '91 Audi 200 20v Avant '01 Anthracite M5 '90 M3 '85 Euro 635csi '12 X3 E34 530i (maybe rear-mount soon)
Start light and see where that gets you. Then for every psi of spring you add, you will get roughly another psi of boost so you can use the deltas between springs to get you to where you need to be. For example, my car was making ~15psi on whatever spring was in there. I wanted 19, so I came up with a combo 4 lbs heavier than my starting spring.
