A comment comparing AEM and the DSM ecu. Can anyone else comment on these?
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Originally Posted by dan l
Wrong, it is MORE powerful than the most popular standalone for our cars in the US, the AEM. Also the processor speed in the OEM ecu is amazing. That it is working at every ignition event is REALLY fast.
This system is much more sophisticated and even proprietary to our engines from Mitsubishi. Even if a company wanted to mimic the functionality they can't, its patented. When properly tuned this system will provide the most protection bar none.
I've seen a AEM logs where knock voltage never went over 2 volts and a guy lost a motor, parts through the block on the top end of the track. The AEM system relies on a really good tune and the assumption that the user keeps up on the tune to keep the engine from grenading. Even at that, if a fuel/ignition parts failure occurs mid pull the AEM system can not always decipher knock correctly and save the motor. Another one is a local car that pushed the front balance shaft out when the rod broke off after piston damage an an AEM. For the average street guy who hands the keys to his sober friend to drive his drunk butt home from the bar the stock ecu is the best option.
I know its a bad example because the DSM system works fundamentally different (analog vs digital) to an evo. However the voltage spikes I believe are still picked up on the DSM which is similar to the Evo. At any rate I went to a T&T day last fall in my DSM. Made about 20 passes. All day long the car was either slow or fast but knocking. I couldn't figure it out, so I turned the boost up . Well come to find out when I got home (and the car stalled and pumped fuel through the motor, big fireball). I discovered that the cam angle sensor trigger had worked its way loose. The ignition was advancing +15 deg and retarding -15 degrees at will until the trigger plate jammed and stuck at TDC and stalled my motor. With a total swing of about 30 degrees the stock knock sensor system in my archaic DSM kept my motor alive, pulling timing when needed on a 130mph trapping stock motored street car. The evo system is even more sophisticated, so it should do a better job!
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Andrew: Yes, using a combination of that and adjusting the background noise numbers will accomplish this. People are just starting to test it to see how well it works, but its only a matter of time now!
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