RX7Club.com - Mazda RX7 Forum - no boost in second gear only

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no boost in second gear only

i have no boost in second gear!
only like 5psi out of first!
but third fourth and fith i get the regular 10psi.
1994 stock sequentials 5 speed with hks catback!!
how come theres no boost in second gear ???? any help would be great...thanks

Quote:

Originally Posted by revhardallday

sounds like your vacuumhose mate! Check them all. maby spray some startgas around the hoses and listen if the car revs

Turbo Control system:

http://www.autosportracetech.com/RX-...leshooting.htm

Quote:

The Turbo Control Solenoid / Actuator is one of the more complicated actuators as it requires both vacuum and pressure to operate properly. This actuator is controlled by two solenoids, (both are wired together to the one ECU output) one solenoid applies pressure to one side of the actuator and the other applies vacuum to the other side of the actuator. With pressure on one side and a vacuum on the other side of the actuator, the speed of the actuator is improved. A typical problem is loss of Secondary boost in 1st or 2nd gear at 4,500 RPM, but reliable operation in other gears. This points to one side of the Turbo Control Actuator not getting it's pressure/vacuum, so it will still operate but not quickly enough.