The Project Pad

EDIGREG wrote:nice, I've been meaning to buy one of those Komfort kits. First I need to fix my clockspring so the turn signals actually cancel

Sounds like you've got a case unKomfortable... I've got a spare clock spring if needed bud...


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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...

Weird...

Here's what boggles my mind... spring pressure producing 34.5PSI ... this fluctuation is driving me a bit nuts...

What does it do without the gate only connected to the intake manifold without a valve inbetween?

Hank

Of course you're overboosting, you have 100% duty cycle in all N75 cells, you need 0% in all cells.

N75 is unplugged

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well, which springs do you have in the wastegate? With a free-flowing turbine housing and exhaust you don't need much spring pressure.

What happened between now and when you showed me the log on 15 psi?

loxxrider wrote:What happened between now and when you showed me the log on 15 psi?

Lose IC clamp... FTL...

EDIGREG wrote:well, which springs do you have in the wastegate? With a free-flowing turbine housing and exhaust you don't need much spring pressure.

I believe Hank supplied the 1.5bar spring...

So have you tried it with the wastegate hooked up like Hank said? Vac line right from a vac/boost source to the bottom of the wastegate.

What's in your wastegate?...






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...

My Dear Rubi
Please stop barfing up all of your airflow
You're embarrassing us and we'll need to take you home
Please hold it together

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

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?

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)

PRY4SNO wrote:

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

Glad we've a good community that shares info then

PRY4SNO wrote:Glad we've a good community that shares info then

I know right? Cuz I don't remember that manufacturer making mention of it being supplied with 3 springs preinstalled in the package docs...

But yeah, I'm gonna put that blue spring on...

EDIGREG wrote:

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.

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

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.