Idle should be about 16 - 18 in Hg.
Max boost should be about 10 PSI (for a stock car).
________________
Date: Thu, 29 Jun 2000 16:36:11 -0700 (PDT)
From: RETed (reted_2000@yahoo.com)
> My car idles at about 750 RPMs. Is the vacuum reading a sign of how > aggressive the porting is?
Yes.
________________
Date: Tue, 19 Aug 1997 10:10:14 -0700
From: jramos@sunup.Corp.Sun.COM (Joe Ramos)
First, if you do not have a boost gauge, get one. A necessary tool for everyone with a turbo engine. This is what your boost cycle should look like:
At WOT, 3d gear, everything stock, boost cycle is (rpm's approximate):
rpm psi
3,000 10
4,500 8 (as 2d turbo comes on)
4,500+ 10 (recovers almost immediately)
6,000+ 8 (and holds to redline)
Then here is the operation checklist developed by the Mazda Training Center in Pleasanton, CS:
93-95 RX-7
BEFORE AND AFTER SERVICE OPERATING INSPECTION
STEPS SHOULD BE DONE IN ORDER. FAILURE OF ANY STEP REQUIRES FURTHER
INSPECTION BEFORE CONTINUING.
THESE READINGS INDICATE NORMAL OPERATION
(Readings may vary with altitude and temperature)
1. CHECK FOR PCM CODES AND REPAIR AND CLEAR BEFORE ANY OTHER
PROCEDURE .
2. VERIFY ENGINE IS AT OPERATING TEMPERATURE
- REMOVE DOUBLE THROTTLE VACUUM LINE AT ACTUATOR
- AT OPERATING TEMPERATURE NO VACUUM SHOULD BE PRESENT WITH
ENGINE IDLING.
3. CHECK ENGINE VACUUM AT IDLE
- REMOVE RUBBER CAP ON EXTENSION MANIFOLD
- INSTALL VACUUM/PRESSURE GAUGE ON EXTENSION MANIFOLD
- VACUUM READING SHOULD BE ABOVE 15" W/AC OFF
4. CHECK NO LOAD OPERATION Of TURBO
- BRIEFLY ACCELERATE ENGINE TO WOT IN NEUTRAL
+4 PSI SHOULD BE OBTAINED
- WATCH THE PRECONTROL ROD FOR MOVEMENT
5. CHECK VACUUM TANK'S STORAGE ABILITY W/ENGINE OFF
- PULL OFF VACUUM HOSE AT CHARGE RELIEF ACTUATOR
- SHOULD HEAR AIR ENTERING HOSE VACUUM
- START ENGINE - BRIEFLY ACCELERATE ENGINE TO WOT IN
NEUTRAL AGAIN
- ENGINE OFF - KOKO 6 TIMES
- WATCH CHARGE CONTROL ACTUATOR WORK EACH TIME
- WATCH TURBO CONTROL ACTUATOR WORK EACH TIME
6. CHECK PRESSURE TANK'S PRESSURE STORAGE ABILITY W/ENGINE OFF
- PULL OFF FRONT HOSE OF PRESSURE TANK
- SHOULD HEAR AIR LEAVING TANK (PRESSURE)
7. ROAD TEST WITH VACUUM/PRESSURE GAUGE INSTALLED
- DRIVE TO THIRD GEAR WITH NORMAL ACCELERATION
- ACCELERATE FROM 35 MPH AT WOT UNTIL PASSING 4500 RPM
- A SLIGHT AND SMOOTH INCREASE IN POWER SHOULD BE FELT AT
APPROXIMATELY 4500 RPM. THIS WILL BE ABOUT 65 MPH.
PRIMARY - GAUGE NEEDLE SHOULD BE ABOVE 10PSI UP TO 4500 RPM
SECONDARY - NEEDLE WILL DROP TO ABOUT 8.0 PSI JUST AFTER 4500
RPM
STARTS - NEEDLE WILL THEN BEGIN RISING TOWARDS MAXIMUM BOOST
DEPENDING ON LENGTH OF TIME THROTTLE IS HELD.
- RELEASE THROTTLE
WOT = wide open throttle
KOKO = Key On Key Off
REVISED FEBRUARY 11. 1996
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