Originally Posted by willwren
Originally Posted by DrJay
Save your money on the coils, they have 3.8'* running 11'* on stock coils.
Gotta clarify something here.....the 97 and newer SSEi and GTP got a hotter coil from GM than the other models. Upgrading to this coil may benefit. It'* basically the same thing as the MSD 8224 in 'hotness'.
So if you have an 87-96 Bonneville (any model, but 87-92 must convert to delco II ICM first), OR a NON-supercharged 97-2004 (excluding GXP), the 97+ SSEi coils or MSD 8224 will give you a stronger mid/high rpm range punch.
Not a HUGE punch, but it can be felt (maybe 5-7hp?) You must have wires to support it, and might be better served to wait until a stock coil fails before you upgrade.
This might be one of those "who knows?" things but my opinion is a little different. Lemme explain, and I'm still learning this so tell me if I'm off...
Because both the stock and MSD coils have a turns ratio of 80:1 and obviously have the same voltage input the output for both is fixed at 40,000v. This is why installing an ignition control module ups the voltage to 45,000v; larger input voltage.
The other issue (actually benefit) is the DIS systems is whats called a closed loop dwell control system. The ICM keeps track of the coil buildup to ensure the maximum current was attained (6-8amps I believe *?*). If it is the dwell time is cut short to release some load on the system. If not its lengthened. So basically no matter what you put on there the current will remain about the same as well as the dwell time.
Another misconception about the system is that the power is reduced at higher rpm'*. This is something that was carried over from the old distrubitor points system where at higher rpm the "contact" is made for a shorter time. This isn't an issue with the DIS systems and its one of the reasons it was implemented. The only issue is with the charge time of the coil, which lucky for us is in the 10-200microsecond area.
The resistance in the MSD 8224 coils is about the same (because of the equal length of windings) as the factory system so there really isn't much of a benefit there. They rate their primary at .35 ohms while thats the lower end of factory ratings. This is probably just an advertising thing as GM could technically say theirs is .35 ohms too. The secondary is rated at 7.5k ohms which is close to the factory rating although I couldn't find further information.
The "gain" you may notice isn't really a gain at all. As with all high voltage electronics breakdown begins at the first bolt of electricity. Even normal resistance doesn't mean the coil is in good condition so replacement after higher miles will almost always result in a boost in performance. This doesn't mean you gained anything, you just get back what you deserve.
These are the reasons I don't really feel that spending money on them is necessary, especially if you're on a short budget. I got them becasue at 109k miles it was surely time for a replacement. edit: and obviously I have the DIS-4 system to take advantage of the 45,000v and multiple spark.
Like I said though, I'm still learning so don't take this for anything more than the information is worth.