brake booster fail, carburetor woes 71 240z

[bounce]

Question : can I seal my vacuum hose leading to the bad brake booster and effectively re-tune my carbs?

my Z ran good with my self installed Z therapy carbs.... before the booster failed...now I hear air leak when applying breaks (diaphragm maybe)...also idle drops to stall when braking...

I tried adjusting the carbs to remedy the situation to get the car in for booster replacement and now I've got a non-starter.

I've reset my carbs with mixture knobs all the way up and back down 2.5 turns and get nothing better than bogging from the throttle application until engine reaches 2,200 rpm. (runs great above) but no response from the throttle under that...just bogging.

I need to be able to start and run into the mechanic shop.

can anyone tell me the default turns on the carb sync screws?

If I can cap the vacuum hose, I hope to be able to reset my carbs to default settings (mixture and sync) and start over.... get the Z in for booster R&R and tune again...

[240260280z]

You can seal the fitting at the carb or plug the hole in the hose (maybe just reversing the one-way valve will do the trick even) .

As you know your "power" brakes are no-longer "power brakes" so drive carefully.

FYI Rock Auto has low cost remanufactured Gen 1 boosters.

The default is ~ 2.5 turns down but you can adjust up or down from there in 1/4 turns to optimize.

Tip: http://www.classiczcars.com/forums/thread41940.html

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