MSD ignition, is it good for L67? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 09-27-2005, 01:09 AM   #11
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Blazin, STOCK 97 COILS are hotter than mine were. 97 and newer L67 coils are NOT the same as L36, L27, or Series 1 L67 coils. Please read this topic again.

And we're not talking just coils in this topic, either. The MSD6 is a totally different animal.

Coils don't 'go weak'. They either go out, or work. It'* not a mechanical device that wears. It'* not something that can happen gradually to all 3 coils.
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Old 09-27-2005, 02:08 AM   #12
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Sorry this was pointed at mike_p. . . ... So mike_p: Look at the two highest HP L67'* out there (Intense Turbo Car and Zooomer'* '97 GTP) - Both use stock coils (Nuf Said).

I know stock '97 coils are hotter then yours and I know they are not the same as S1 and L36 but. . . . . ...(as I repeat myself) you will NOT see gains from a hotter spark unless you are having a problem (this goes with the MSD6 ignition too).

As for the coils going week. . . . ...I'm not sure about this one. . . . . ...I can understand that it'* not a mechanical device but just like electrical sensors they get slow and start to have problems. Ryan was having problems with misfires on two cylinders at idle (and only at idle), we went through everything, our last resort was coils and it just happend that the to cylinders that were misfiring were off the same coil. New coil in there and it was smooth from there.
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Old 10-01-2005, 06:41 AM   #13
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I disagree with ya blazin. I switched to MSD'* on my *-10 and picked up close to 17 horse on the dyno at the wheels. Grant it I have heavy mods but it still shows that the coils "can" make power. I wasn't having a problem at all.
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Old 10-01-2005, 05:03 PM   #14
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Just tell me how a hotter spark is going to make HP? Hotter being the key word?
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Old 10-01-2005, 11:45 PM   #15
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A hotter spark is going to facilitate a quicker ignition of the fuel thereby increasing efficiency and a gain in power. It can't be put any simpler then that
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Old 10-02-2005, 01:03 AM   #16
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The MSD coils 'can' let you run a larger gap with out misfires. Most people running MSD coils don't want to take the time to test larger gaps on there car. You do know that even though you will raise the 'ceiling' voltage that the coils could put out, they will only put out what they need to get the job done. It'* just like a fuel pump and fuel pressure. . . ...
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Old 10-02-2005, 01:06 PM   #17
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On the contrary if you want to compare it to a fuel system the coils just like the fuel pump on our cars run at max out put. The fuel pressure regulator is what brings the pressure down to "enough to get the job done" just like the gap in the plug is what dictates just how much of a spark there is. So I guess in your thinking hotter coils in themselves will not necessarily make a bunch of power however they will let you increase your plug gap again increasing the efficiency of the fuel burn.
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Old 10-02-2005, 03:06 PM   #18
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My example with the fuel pump is that I can raise voltage to the pump - which will raise my fuel pressure - which will lower my IPW'*. Just because I raise my fuel pressure doesn't mean that it will add HP - it will just give me more 'headroom' with fueling. Just like MSD coils - just because you can put out more volts doesn't mean that you are going to be using that extra volts - it will just give you more 'headroom' with spark.

Yes I'll agree that you will be able to increase plug gap (because of the 'headroom') but that doesn't mean that you are going to see a huge difference. Take your plugs and gap them to .30 and take them and gap them at .60 - thats about the difference you will see.
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