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Cause for audible turbo spool just before yellow? 700

posted by  Will740turbo on  Sat Aug 19 16:15 CST 2006
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last visit: Wed Oct 22 16:09 CST 2014
[RELATED]

I've got a 90 740T, been working on it since I realized I could with the brickboard's help.

All new vacuum hoses except the one to the turbo gauge in the dash. I have good vacuum, good sensors, proper breather box function, and 235500 miles.

I can hear my turbo start to spool/spin just before the needle touches the yellow area of the turbo (at about 11:30). I'm wondering if this may be a case of bad seals or what it may be.

It occurs to me that the vacuum line might be leaking, as it doesn't appear to be in very good shape and pressure is more likely to cause a leak than vacuum.

I also have "turbo creep" if I just hit the yellow (12:00), the gauge creeps to 12:30. That seems plausible to me, as the increase appears to be logarithmic - sudden, but it levels off.

Thanks for any ideas,
Will
--
1990 740 Turbo, on its way to stock specs, maybe beyond






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