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post #1 of 4 Old 06-13-2013, 07:11 AM Thread Starter
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Rpm question for tune...

Have a single turbo setup on my 89. Tuning with a Moates Quarterhorse. I have the rev limiter in the tune set to 5800 and 5600 on my Summit branded ignition. Got me thinking, in trying to keep her under 6000 rpms to prolong the stock block, which one do i want set lower than the other? Doesnt the eec kill fuel and the ignition would kill spark, so i would set to kill spark first correct?

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post #2 of 4 Old 06-13-2013, 07:23 AM
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I don't know how the chip handles it. But if it does it the same way the stock ecu does. Then hell yes use the box. Because it will use spark no fuel, and won't lean you out.

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post #3 of 4 Old 06-26-2013, 01:39 PM
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The mixture doesn't lean out; there is no mixture. When an injection event is cut, there is simply no fuel for that cylinder to burn. OEMs use it almost exclusively, if not exclusively, even with turbo engines, because it doesn't have the same potential for damaging parts that spark-only rev limiting does. Throwing fuel and air into the exhaust sets up the potential for melted cat converters (if you have them) and/or lighting off ahead of the turbo, which will put tremendous thermal stress on both it and the piping. Great for boost, bad for parts.

There is the issue of wall wetting and fuel cut will cause the ports to dry out, which has bearing on how the engine responds when fuel comes back. I am not sure how the EEC-IV strategy handles that.

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Last edited by GT Madness; 06-26-2013 at 01:48 PM.
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post #4 of 4 Old 07-14-2013, 01:39 AM
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it fires every other injector to prevent the engine from wrapping, its not as effective as killing spark then thats a dead limiter, but it works very well, i usually recommend using both a spark and fuel limiter, just set the fuel limiter at the same rpm as your ignition box limiter

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