BIGGSIE
15+ Year Contributor
- 233
- 0
- Sep 17, 2003
-
Hartwick,
New York
Well I finally got around to installing my GM MAP sensor so I decided to do a small write up. The reason for this mod is to give the SAFC a boost related input instead of an input from the TPS. I will use an example I read somwhere else, say you are in third gear at 2500 RPM, you mash the gas and the SAFC sees 100% throttle position and starts to dump fuel, problem is your turbo has not spooled up yet and you don't need the extra fuel until you reach full boost so your car has lag for a second or two. Another example is if you are cruising on the highway and you come to a hill your boost will start to rise due to the increased load but the SAFC will not compensate for this. Here is how you can trick the SAFC.
1.) Purchase: GM 3 bar MAP sensor (part # 12223861)
MAP sensor plug pig tail (NAPA)
Wire
Shrink wrap connectors
2.) Mount sensor under hood in a safe place. (Firewall)
3.) Wire plug to vehicle. Sensor and plug are labeled A, B, C, A=Ground, B=Output signal, C=5v power. Find a good ground (Neg. battery terminal) run wire to pin A. Find a steady 5v power supply (TPS harness) and wire to pin C. Run last wire from pin B through firewall near SAFC harness.
4.) Remove throttle signal wire (gray) from ECU harness and solder to the wire you just ran into the car. Make sure to protect all connections with shrink wrap.
5.) Run a vacuum hose from the sensor to a vacuum/boost source from the engine.
6.) Turn key on (engine off) and monitor throttle % on SAFC, set your low throttle point to that %. (mine was 22.9%) Now start engine and monitor %, should read 00.0%. If you are properly tuned then do a pull at your desired boost level and see what % you get, set your hi throttle point to just below that %. Now you can fine tune from there. You should notice a smooth onset of power, a little less lag, better partial throttle driving, and possibly batter gas mileage.
I am sure there are different ways to set your throttle points but I haven't had time to play with it too much yet. If anyone has any comments or corrections let me know. Here are some pics of the install.
1.) Purchase: GM 3 bar MAP sensor (part # 12223861)
MAP sensor plug pig tail (NAPA)
Wire
Shrink wrap connectors
2.) Mount sensor under hood in a safe place. (Firewall)
3.) Wire plug to vehicle. Sensor and plug are labeled A, B, C, A=Ground, B=Output signal, C=5v power. Find a good ground (Neg. battery terminal) run wire to pin A. Find a steady 5v power supply (TPS harness) and wire to pin C. Run last wire from pin B through firewall near SAFC harness.
4.) Remove throttle signal wire (gray) from ECU harness and solder to the wire you just ran into the car. Make sure to protect all connections with shrink wrap.
5.) Run a vacuum hose from the sensor to a vacuum/boost source from the engine.
6.) Turn key on (engine off) and monitor throttle % on SAFC, set your low throttle point to that %. (mine was 22.9%) Now start engine and monitor %, should read 00.0%. If you are properly tuned then do a pull at your desired boost level and see what % you get, set your hi throttle point to just below that %. Now you can fine tune from there. You should notice a smooth onset of power, a little less lag, better partial throttle driving, and possibly batter gas mileage.
I am sure there are different ways to set your throttle points but I haven't had time to play with it too much yet. If anyone has any comments or corrections let me know. Here are some pics of the install.
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did'nt make the denso fuel pump.. AEM just orders them to their specs with the NPT...
