RX-7 Home

Overview

Troubleshooting

Symptoms

FAQs

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Turbocharger Overview:

Overview of exhaust and intake air flow through turbocharger. Click image for higher resolution (~90K).

Turbocharger Control System

RPM

0 to 3,000

3,000 to 4,500

4,500 to redline

 

Light Load ------------------------------------------------------------------------------>> Heavy Load

Primary Turbo

Boost

Secondary Turbo

Stop

Preliminary Rotation

Boost

Turbo Pre-Control

Duty Control

Duty 5% (fully open)

Wastegate Control

Duty 95% (fully closed)

Duty Control

Charge Releif

OFF (vent to air cleaner)

ON

Charge Control

ON (isolate Primary and Secondary Compressors)

OFF

Turbo Control

OFF

ON

0 to 3,000 RPM

3,000 to 4,500 RPM

At 4,500 RPM

4,500 to Redline

From the above description, there is not much happening when only the Primary Turbocharger is operating. However, at 4,500 RPM when the change over occurs, lots of solenoids and actuators are changing operation. This is when most of the problems occur.