1984 Chevy Camaro - Power Struggle
| BASELINE | | RPM | LB-FT | HP | | 2,500 | 165 | 83 | | 2,600 | 172 | 87 | | 2,700 | 182 | 94 | | 2,800 | 184 | 98 | | 2,900 | 186 | 103 | | 3,000 | 188 | 108 | | 3,100 | 189 | 112 | | 3,200 | 191 | 117 | | 3,300 | 193 | 122 | | 3,400 | 192 | 125 | | 3,500 | 191 | 128 | | 3,600 | 190 | 131 | | 3,700 | 189 | 134 | | 3,800 | 192 | 140 | | 3,900 | 206 | 155 | | 4,000 | 222 | 171 | | 4,100 | 225 | 177 | | 4,200 | 228 | 184 | | 4,300 | 232 | 191 | | 4,400 | 231 | 195 | | 4,500 | 231 | 199 | | 4,600 | 230 | 202 | | 4,650 | 230 | 204 | | | | | Average torque | 201 lb-ft | | Average power | 139 hp | | | | QUARTER-MILE | | 60-ft: | 2.27 | | 11/48-mile: | 9.88 @ 69.61 mph | | 11/44-mile: | 15.40 @ 90.53 mph | 
Murphy uses the shortest accelerator pumps he can get, since they have the most fuel capacity. A garter spring (hidden) keeps tension on the cup, which helps keep it sealed against the pump cavity. The cups are methanol resistant, a plus when running California-spec gas. Murphy also pays attention to delayer spring length. If the spring binds, the pump can't compress the fluid and can't provide a full pump shot. | 
This type of Q-jet actually has a throttle position sensor (TPS). It's important that the sensor protrudes through the proper opening in the gasket (arrow) so it can contact the spring-loaded TPS actuating pin, which runs off the accelerator pump. The hooklike appendage is used to adjust TPS height, if necessary. | 
In this case, computer control doesn't eliminate the traditional Q-jet voodoo involving secondary metering rods and hangers. "There used to be about 40 rods," Murphy observes. "Now we're down to 10." Hole location on the hangers varies in 0.005-inch increments; raising the hole makes for a richer mixture that kicks in faster. Rods are lettered from B to V; we started with AU rods on an I hanger, as opposed to a stock CH on an M hanger |
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