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lack of boost with no actuator hose attached 900 1992

posted by  triode52 on  Fri Feb 19 06:26 CST 2010
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last visit: Mon Oct 22 09:17 CST 2012
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I have a 15g on my 1992 740 and I have to admit that I am also not very impressed. I can also make max 12 psi. I thought that my problem had to do with the flimsy wastegate actuator bracket that I have along with a weak actuator which is not uncommon with the 15g's. I had not considered the CBV before, but that would also certainly cause lower maximum boost so I have something else to mull over. EDIT: I found a possible answer at IPD. They say that the stock CBV is only good to 12 psi:

http://www.ipdusa.com/product.asp?strParents=&CAT_ID=0&P_ID=5223&strPageHistory=search&numSearchStartRecord=1

In general, I have not been overwhelmed with the 15g and stop light to stop light and I liked the 13c because it spooled up faster in comparison. Also, if all sorts of boost is leaking into the exhaust then that would also explain why my car has been running leaner than usual since I made the switch. It looks like I also have a project for the weekend and an excuse to upgrade the CBV.


Mike






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