Watson Posted July 13, 2014 Share Posted July 13, 2014 Now this was a bit strange. I've been trying to get my pulse width modulation setup correctly on my megasquirted L28E+T (N42 block and head featuring a turbo, hence the 'plus') because for the life of me, I cannot rev past 5000 rpm under full boost, and only under full boost. Well, I've had positive results with adjusting the injector characteristics, although I'm still not past 5500 rpm; maybe with more tuning I can see 6500. THE ISSUE, SORT OF: So when I went to make a second gear pull to test things out, the engine began to fall on its face at 5500 rpm (expected) but afterwards, it sounded so much deeper and louder. It sounded like the car's balls just dropped and it had become a HUGE Mac truck. When I shut the car off and restarted it, it was normal. What would cause this? I'm just curious. My exhaust setup is simply a three inch pipe off the turbo for about six feet, so nothing could have blown out, exhaust wise, to cause such a low rumbly loudness. I wish I had a video to demonstrate this. It sounds normal again so its not really an issue, now, but does anybody have any insight as to what would cause this? Quote Link to comment Share on other sites More sharing options...
dexter72 Posted July 13, 2014 Share Posted July 13, 2014 The problem with not going past 5k may be your tune or your engine setup, include Injector cc's, Distributer or non distributor, Spark plugs, and Clutch. What is your spark plug gap??.. Can you list your setup and post your tune??... Quote Link to comment Share on other sites More sharing options...
RebekahsZ Posted July 16, 2014 Share Posted July 16, 2014 Rust inside the muffler, or maybe a hole? You gotta get some of those plastic balls to hang from the back-every redneck in Alabama has a set! Quote Link to comment Share on other sites More sharing options...
Watson Posted July 19, 2014 Author Share Posted July 19, 2014 I found the problem to all of my issues. The shutter wheel for the optical trigger was moving. The low sound of the engine was because the wheel rotated so far out of phase that my timing was very out of whack, thus altering the running quality and sound of the engine. (Verified this scenario with a timing light) The upper RPM cut was again because the wheel would keep moving out of phase. I'm done with this distributor. I'm going to get a proper CAS and EDIS system for this car. Quote Link to comment Share on other sites More sharing options...
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