One picture saves a thousand words. Seven pictures, 7000.Sometimes it is better to ignore them then to waste the letters it takes to build a sentence that has sensible words.
I have that thing presently...it's a bleed valve alright, .....like it wont let the iron lung build any pressure at all. put 20 psi in, 20 psi goes right back out that hole. I modified it by tapping the thing so I can restrict the upward movement of the check ball, but in order for very little boost to get past it, I have to close the set screw down too tightly and it'll pass the boost through to the modulator. Open the set screw to minimize that, and let boost blow by, and the iron lung don't hold regulated pressure.Yup. Modulator valve. Humf...
If you reverse the following system the way Cosmo Kramer does it, you'll most likely control the shifting better
928 Forum - Modulator valve on auto boosted car - finally sorted! - FINALLY got this issue sorted out, I even called Steve Cattaneo for advice as I was at the end of my rope! My issue was a very hard shift at WOT from 2-3 gear due to the modulator valve seeing boost pressure and upping the line...rennlist.com
VBP-VAc For trans's with vacuum
modulator and superchargers or Turbo. All you do is put a T and a one way check valve to bleed off boost, the rest of the time it will work on vacuum like normal.
IIRC, This is what the 1980 Fairmont Turbo 2.3's used with the C3 Bordeaux, a non return valve.
Vacuum/Boost Bypass Kit: All trans with vacuum . Prevents boost pressure from causing runaway line pressure.
It was unknown. After converting back to turbo, I had to find a way to keep the glass top on cause it kept blowing off. Once that problem was licked, then it became a matter of keeping blow by, and the oil it was spewing everywhere contained. But as to how much boost it made on the gate, I never logged it. It was just way better than the ITB's were w/o a turbo.I must have slept and missed what's different in the induction side now that it's back together vs. last year when it made boost.
So,....what's left to blame? Either the Chinee turbo is the limitation, ( something is wrong?) the fact that there is now an additional muffler that may be choking the exhaust flow, causing excessive back pressure, or boost is getting by the ITBs....I have 11 pounds of boooost,...I have 11 pounds of boost, and I don't got no Raa-atle...
Well there's a vid...but I can't get it to upload. 11 minutes of me stickin in my face into the picture while I get the camera set, dicking with the computer, and driving the car, and about 15 seconds of Wheeeeee. It doesn't matter though,....just as soon as I mat the gas, all you hear is the microphone being overwhelmed.
I did data log the 11 minute ride to work,...( that's how I know it makes 11 psi) I haven't looked st it other than that for inj duty cycle, afr or any of that other junk. But I can finally say that it runs so damn good.
Yes but the boost reference to the WG is not part of the ecu's decision making when the controller is off. It is purely mechanical. If the freakin turbo won't supply enough pressure to lift the spring in the gate when the controller is off, something is..........awry.Because that is where the ECU is seeing pressure along with the manifold.
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