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Old 06-22-2009, 04:22 AM   #1
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Default MSD Sebring box issues or possible alternatives

I have a 94 miata with a sebring supercharger. The only management it has is a MSD sebring box. Which to my knowledge just varies timing with increase in boost.

The problem: The engine sometimes stumbles. for example; in 5th gear while cruising at 2100rpm. Or sometimes in 1st or 2nd gear if you just mash the gas peddle it will stumble and stutter sort of. I have also noticed that above 2.5k-4k you can step on the gas and the boost gauge will see 5psi but it doesnt seem to really go or pull hard until 5k.

Any thoughts, I tried searching but did not find anything on this. I bought new ngk iridiums to try. And a friend of mine has a fuel and timing power card that I was thinking about trying...I think this might be a better setup but am afriad that it resolution might suck!

any help would be great, Thanks!
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Old 06-22-2009, 10:29 AM   #2
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What are you using for fuel management?
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Old 06-23-2009, 06:58 AM   #3
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To my knowledge it does not have any fuel management, which is why I thought the power card and timing card would be a good idea. However, I have now been debating just getting the Megasquirt PnP...but always have hear medeoqure things about MS...Is the pnp pretty decent?
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Old 06-23-2009, 08:07 AM   #4
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The early kits for the 1.8 just used a resisotr to trick the engine into adding fuel. Not sure if that's what you have or not. But it's not enough. The later kits come with a power card.
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Old 06-23-2009, 10:56 AM   #5
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