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Re: Help, Dropping Boost
A previous car of mine, a 5KT, started having similar boost problems and it
turned out to be the turbo bearings getting fouled. The theory was that I
wasn't running the car before shutting it off after a highway run.
Earlier, that same car had problems developing boost and it was a clogged cat.
I used a can of carb cleaner to look for leaks some time ago on my urQ. I
found them at the injector seals and the accordion hose. All I did was
spray it at suspicious things and if the rpm increased, I had found a leak.
>I have a little problem I have been trying to fix
>without success. Over the last four months of
>driving my Ur-Q, the maximum boost attainable has
>been dropping. In december I reported times of
>11.2 stock boost and 10.2 with 15 psig. This last
>week in the stock configuration I was getting near
>14.0, and I can't achieve 15 psig. In addition,
>I have noticed some reduction in the speed of
>I have thouroughly done over the schrappnel knobben
>and removed it as a possible source of problem.
>Since stock boost times are effected this isn't
>suprising. I have had some problem with the
>accordian hose, but have added another layer of
>material to close off any possible leakage. I still
>hear some hissing under boost.
>Could this been air coming out the cruise control vavles
>at the pedals due to a bad one way valve?
>Would that effect boost by reducing the wg control pressure?
>Is there some other area I should concentrate on?
>I have used a propane torch as a leak detector with
>no positive indications. Any hints on it's proper
>Thanks in advance to the net at large for any assistance.
>(gruby of nail, weak of back, but determined to break 10.0 by sunday)
San Jose, California
'87 560 SL