| Porsche 911 Carrera Motronic Fuel Injection (1984-89) - Page 1 |
The Motronic system that was implemented on the 1984 911 Carrera is what is commonly called a pulsed injection system. The fuel injection system only sprays fuel into the intake manifold when it is required in the combustion cycle. In this manner, the system can more accurately control the fuel levels and fuel delivery, and help to better maintain the ideal stoichiometric air/fuel ratio of 14.7.
The Motronic system also takes fuel injection one step further, and incorporates an engine management system that also controls the ignition system. The marriage of ignition and fuel injection is a natural fit because they are completely reliant on each other for proper engine operation. The Motronic system not only times and meters the fuel, but it also decides when to fire the spark to make combustion happen.
The central Motronic computer controls the ignition and fuel injection system. The computer takes input from a variety of sensors placed about the engine. An engine RPM sensor indicates how fast the engine is running. An airflow sensor measures the amount of air that is being drawn into the engine, and thus the amount of load on the engine. An oxygen sensor measures the exhaust gases exiting the engine in order to correctly meter the mixture. Timing sensors and cylinder head sensors also provide additional information for the computer.
The computer itself is able to take all the input from the sensors, and calculate the best ignition timing and fuel delivery to create the most horsepower with the least amount of emissions. The computer has a Read-Only-Memory (ROM) computer chip inside that contains what is known as a data map based on engine dynamometer and emissions tests performed at the factory. At any split second, the computer can read in all the input from the engine, compare it to the map in the ROM chip, and decide how much fuel to deliver and when to fire the ignition.
The advantages of such a system are numerous. Gone are the mechanically complex methods of advancing the timing with counter weights and vacuum advance units. Points inside the distributor are a thing of the past as well. Instead the engine relies on the computer to control all fuel and ignition related decisions. In milliseconds, the computer can gather input data, access the ROM chip, and interpolate the best settings for the engine.
Storing all the computer data on a ROM chip also allows for the chip to be swapped out for different applications. Certain aftermarket manufacturers sell chips for the 911 Motronic system that are not as conservative as the factory chips. They promise gains of about 10-15% more horsepower at various RPMs. While some of these chips may not be legal in all 50 states, they do seem to work. Check with your local auto repair shop to see which chips are legal in your area. [Excerpt from the book 101 Projects for Your Porsche 911] |
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Performance Chips |
| 911Chips Performance Chips |
Not just another performance chip for your 1984-89 911 Carrera! 911Chips' Steve Wong has spent hundreds of hours revising code and road testing to unleash new pockets of performance previously undiscovered. These chips are programmed with these three primary objectives in order of importance: - Reliability
- Maximum performance, response, and power
- Good fuel efficiency at cruise and light loads
Select between a 'stock' chip program or one specific for modified exhaust systems. All chips have a 100% satisfaction guarantee. For US cars only.
Visit the manufacturer and find answers to your questions here. |
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| PEL-8486STK | 911Chips Performance Chip by Steve Wong, stock exhaust, 911 (1984-86) [More Info] | $374.95 |  |
| PEL-8486EXH | 911Chips Performance Chip by Steve Wong, sport/premuffler exhaust, 911 (1984-86) [More Info] | $374.95 | |
| PEL-8724STK | 911Chips Performance Chip by Steve Wong, stock exhaust, 24-pin only, 911 (1987) [More Info] | $374.95 | |
| PEL-8724EXH | 911Chips Performance Chip by Steve Wong, sport/premuffler exhaust, 24-pin only, 911 (1987) [More Info] | $374.95 | |
| PEL-89STK | 911Chips Performance Chip by Steve Wong, stock exhaust, 911 (1987-89) [More Info] | $374.95 | |
| PEL-89EXH | 911Chips Performance Chip by Steve Wong, sport/premuffler exhaust, 911 (1987-89) [More Info] | $374.95 | |
| 911MAX Performance Chips |
| MAXhpkit has been offering 944 Turbo performance chips for years, and has now created a set of performance chips for the 3.2 litre Carrera. They claim that the 911MAX offers greatly enhanced throttle response, and a broader power band in all rpm ranges. Rev limiter has been increased to 6760, but can be custom ordered at no additional charge. Idle and cold start maps have been optimized to give instant starts and smooth running. These maps have passed emission inspection, and use the factory O2 closed loop mode for efficient running and good fuel economy. The part throttle maps have been meticulously reworked to provide the best performance and drivability. Launching is much better than stock, there is no hesitation or bucking. Deceleration is smoother, and overall throttle response has been optimized for greater control with less effort. On the dyno, MAXhpkit states the torque is 3-13Lbs greater across the board, meaning greater area under the curve. This dyno testing was done using 91 octane pump gas. Greater performance and more efficient fuel consumption can be obtained with 93 octane. They designed around 91 to allow a safety margin for varying fuel quality. Click here to see dyno chart |
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| 911MAX-8624911V10C | 911MAX Performance Chip, 1984-1987 Porsche 911 Carrera 3.2L w/ stock exhaust [More Info] | $299.00 | |
| 911MAX-8828911V10C | 911MAX Performance Chip, 1988-1989 Porsche 911 Carrera 3.2L w/ stock exhaust [More Info] | $299.00 | |
| 911MAX-8624911V10NC | 911MAX Performance Chip, 1984-1987 Porsche 911 Carrera 3.2L w/ modified exhaust and/or no catalytic converter [More Info] | $299.00 | |
| 911MAX-8828911V10NC | 911MAX Performance Chip, 1988-1989 Porsche 911 Carrera 3.2L w/ modified exhaust and/or no catalytic converter [More Info] | $299.00 | |
Air Filters |
| Clogged air filters can reduce air flow into the injection system causing reduced power, and inefficiency in the fuel injection system. Replace yours with an original style filter, or replace it with a K&N filter that will last the life of your car. |
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| 930-110-393-00-M67 | OEM Air Filter, 911 Carrera (1984-89)
Brand: Mahle Filter [More Info] |  |
| $11.75 | |
| K&N Air Filters |
| K&N air filters are designed to achieve high, virtually unrestricted air flow while maintaining filtration levels critical to ensure long engine life. The secret to their success lies in the unique characteristics of their filter medium that was originally developed by K&N all those years ago in the dust, sweat and tears of desert motocross racing. The high flow cotton gauze air filter is washable, reusable and built to last for the life of an engine. The filters consist of four to six sheets of cotton gauze layered between two sheets of aluminum wire mesh. This media is then pleated and oiled to enhance its filtering capabilities and overall performance. The result is an air filter that allows dramatically more air into an engine, is washable and reusable, and will protect your engine for the life of your vehicle. |
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| 930-110-393-00-M318 | K&N Air Filter 332076, 911 Carrera (1984-89)
Brand: K&N [More Info] | |
| $58.00 | |
55-0819-560-M318 | | $12.75 | |
AireTEK Performance Intakes |
AireTEK High Flow Induction Systems: Engineered to flow MORE air for MORE power. It's that simple. Just like an asthmatic relying on an inhaler to breathe easier, our AireTEK Induction System will "decongest" your engine to allow more air intake with less restriction. Our CAD designed streamline air plenum incorporates a patented high flow air filter, which assures optimum performance and durability. All AireTEK induction components undergo countless hours of research and development with extensive dynamometer and "real world" testing prior to manufacturing and distribution. Average gains are 6-12 HP depending on vehicle and level of other performance upgrades.
911 Carrera Installation Instructions (PDF) |
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PEL-INTK911 | AireTEK High-Performance Intake, 911 (1984-89) [More Info] | $195.00 | |
