If you've set your timing on a Miata using the flash-delay feature (without a 2-stroke setting), I challenge you to go check your timing against the protractor with zero degrees dialed up. If however, it has a 2-stroke setting, it knows the sparks are 360 degrees apart and uses the correct math to calculate the delay. If you told the light you wanted 10 degrees. Result? It delays the light flash half as long as you've requested. It thinks your engine is rotating twice as fast as it actually is. Its expecting a spark every 720 degrees, but it actually gets one every 360. How does it know how long this delay needs to be? by measuring the time between sparks! what is the light doing? Its delaying the flash from when the spark fires a set amount of time, based on how many degrees advance you've requested. If you set the timing adjust dial to zero, and actually use the timing protractor (like a timing light without this feature) it will work fine.īut lets think about what happens when you use this feature. Yes, the wasted spark occurs at exactly 360 degrees from the "correct one" and when you shine the timing light, everything looks fine. The "wasted spark" occurs exactly 360 degrees late when number one is on its exhaust stroke, and the timing marks are aligned the same as when number one is on the compression stroke. ![]() No, and the pully notches are just fine with no need to compensate. ![]() Although I have no first hand expierience, I imagine their are some members from the forced induction crowd that can attest to the problems with incorrectly remapping engine performance parameters!Īnybody concur with what Fletcher says about needing a two-stroke setting on the timing light for accuracy on a Miata? Seems to me Mazda would have compensated with location of the pulley notches, first time I've heard this one. Attempting to effect a performance change by altering a mechnical setting may only serve to worsen performance and it may even activate the CEL light as the computer tries to compensate for an out of parameter condition! In order to tune the engine, you will need a scan/programming tool that can access and change engine program variables in the vehicles Electronic Control or Power Control Module (not sure what it is called in NB cars). in the NB cars is monitored via a network of sensors and is controlled by a computer module. I may be wrong, but I am willing to bet that like my 99' Expedition, all of the inner workings of the engine - timing, spark, fuel injection, etc. What do you do with a 2002 that does not have any high tension wires to wrap the inductive pickup around? Our sparks fire twice as often as most 4-strokes. If you use a timing light with a pre-set timing feature like the one you are looking at, unless it also has a two stroke setting, it will give you the wrong timing because of the miata's "waste-spark" ignition system. ![]() They make a base-model thats just a timing light, but mine has a meter on the back that can be set to read volts, RPM, or dwell-angle (doesnt apply to our cars). ![]() I do not abuse it, but it often rattles around in my tool-kit or trunk. Its made of plastic and doesnt look especially robust, but its given me 10 years of service so far, and not showing any signs of getting worse. I'd like to hear what kind of inductive light you guys use on your NA, and which one you wish you'd purchased instead. I saw a timing light at auto zone that had a dial on the back of the gun for "accurate measuring and advancing".
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