Quote:
Originally Posted by TBatt
One other thing I noticed in the data, on the Z1 dyno run the boost built up very linear until red line where it dropped like a rock when the throttle closed like it should. With all of my runs the boost builds up to a point and then flattens out and then actually drops, VDC on or off. When the boost stops rising and flattens out it also becomes rather noisy jumping from one pressure to another changing around 1 to 2 psi during that time. Could this be caused by a bad BOV?
If it was just a leak it should just be a loss of pressure and pretty constant I would think. If the BOV starts leaking it could be fluttering and that could cause a rapid pressure fluctuation. Anybody seen this kind of problem?
I would hate to spend the $$ on a Tial (they are sexy looking) but at this point I don't give a damn about the money, I just want the boost to be where it should be.
Maybe I should fly TopgunZ down here for a weekend to help me solve this........
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Which BOV are your using now? I do remember from older thread that the plastic Bosch bpv supplied with the Stillen kit not holding boost beyond the typical boost pressure from the carb legal setup. Guys increasing the boost usually stepped up to the Turbosmart dual port 25mm BOV. if you boost levels are at 8-9 psi the bosch should be fine though.
You still on stock cat? With my test pipes, my boost levels were below what I would get with stock cats. I should be seeing 11 to 12 psi but dynoed just below 10 psi.