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I am the original owner of a 1985 740 Turbo. In 1986, Volvo introduced a "Turbo Plus" kit which I purchased as a dealer-installed option. The resulting improvement in performance was immediately noticeable.
However, I have never understood exactly what the Turbo Plus kit is (in terms of mechanical and/or electrical componentry) although I understand that it allows for extra turbo boost at full throttle.
The reason I am asking about it is that I do not feel that the Turbo Plus is currently functional. The turbo guage presently shows full boost up to the limit of the green at full throttle; however, the guage used to show boost a bit into the yellow when the Turbo Plus was functional.
Anyone have any experience or ideas regarding this?
-Keith
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