I am running a manual waste gate, I suspect some subtle leak in either the intercooler or hoses. I don't have the usual whistle associated with a leak. But i do seem to have to turn the knob for more or less boost from time to time. To keep boost constant at engine.
My thought was to put in a "T" and measure boost preasure at turbo outlet ( T in the line to wastegate control) and then to put the boost guage at or near engine and see if there are less pounds of boost at engine than at turbo. If I have have some minor leak, then I am overheating the air building better than 10lbs boost at turbo, and the wastegate is staying closed more than it should, restricting exhaust. All the clamps are tight.
I can over boost if i turn the valve far enough, and their are no signs of turbo bad, such as oil leaking, i have K&N air filter in stock box, so I
doubt i am collapsing turbo intlet hose, I am just trying to run 8-9 lbs consistantly.
I just switched from a simple bleeder to the ball and spring waste gate controller to get more consistant boost under varous throttle. it seems to have helped keep consistant boost under various throttle, on any given drive, but this day to day variation is annoying
Does any of this sound reasonable?
what you describe is typical of a manual boost controler of the non electronic variety. the ball type is better at dialing in boost, but day to day variations are the norm. temp humidity and atmph pressure will all affect it.
You speak with wisdom, i measured the preassure at the turbo outlet and it was 11-12 lbs. That is putting me right on the edge of boost cut off, depending on throttle, temp, etc. much ado about nothing.
thanks
Quote from: florida_tgpYou speak with wisdom, i measured the preassure at the turbo outlet and it was 11-12 lbs. That is putting me right on the edge of boost cut off, depending on throttle, temp, etc. much ado about nothing.
thanks
Boost cutoff with a stock chip? is there that much of a pressure drop from turbo to manifold. I never measured it.
I think you would loose a pound or two with an intercooler in line...sure.
chip is not stock, but still has factory cutoff of 9.5lbs? Is "t"ing into the line that feeds FPR the right place to monitor manifold preassure with
a guage? if not where?