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Hi, All
I recently did some sorting on the ignition system of my 964 with quite dramatic effects.
It is well-known that 964s have a symmetrical dual ignition system. Symmetrical, in that each cylinder had two spark plugh that should fire at the same time. Essentially, it has two identical ignition systems, each one supplying spark to one of two plugs in each head.
I noticed that my car was not running well. It was "flat". Because all of the ignition components are duplicaed, it is possible to do a swap-out test on a single car, and I found that one of my coils was dead. Totally dead. This meant that the car was just a bit off-colour, not seriously ill. My first attempt to fix this was to replace both dizzy caps and rotor arms; and this did help. A lot! Still, it was only running on one good spark.
My car was in with a top-rank specialist for some suspension work. Your Man, there, of vast experience commented on how well my car goes - lots of midrange torque and spinning eagrely up to the Tiptronic-imposed limit. This was in contrast to so many "soggy" 964s he had come across.
That they went with a twin-spark system, and the expense involved, suggests to me that Porsche recognised that efficint combustion was a problem. This probably means they we, so many years later, should also think of efficiient combustion in a 964 engine to be a problem.
The moral: keep your ignition system in top order. Replacing a coil pack is a hand-scrating operation of no more than an hour and seveny quid. It might be the best value performance improvement you could get, It certainly was fir my car!
A
I recently did some sorting on the ignition system of my 964 with quite dramatic effects.
It is well-known that 964s have a symmetrical dual ignition system. Symmetrical, in that each cylinder had two spark plugh that should fire at the same time. Essentially, it has two identical ignition systems, each one supplying spark to one of two plugs in each head.
I noticed that my car was not running well. It was "flat". Because all of the ignition components are duplicaed, it is possible to do a swap-out test on a single car, and I found that one of my coils was dead. Totally dead. This meant that the car was just a bit off-colour, not seriously ill. My first attempt to fix this was to replace both dizzy caps and rotor arms; and this did help. A lot! Still, it was only running on one good spark.
My car was in with a top-rank specialist for some suspension work. Your Man, there, of vast experience commented on how well my car goes - lots of midrange torque and spinning eagrely up to the Tiptronic-imposed limit. This was in contrast to so many "soggy" 964s he had come across.
That they went with a twin-spark system, and the expense involved, suggests to me that Porsche recognised that efficint combustion was a problem. This probably means they we, so many years later, should also think of efficiient combustion in a 964 engine to be a problem.
The moral: keep your ignition system in top order. Replacing a coil pack is a hand-scrating operation of no more than an hour and seveny quid. It might be the best value performance improvement you could get, It certainly was fir my car!
A
