6al to a 7al

At what point does it become a good idea to change from a MSD 6AL to the 7AL? Is there horsepower to be had?

comp, fuel , power adder ?

514Fox87 wrote:At what point does it become a good idea to change from a MSD 6AL to the 7AL? Is there horsepower to be had?

Funny how great minds think alike ........

I'm completating the same thing. I was just talking with a few of the members here on the same thing yesterday. From what I've picked up there is a voltage increase, which is good, the 7 has some built in features which I may not need... so I think at this time I'll will stay with my 6AL because it has no problems and add a two step for my brake. But I'm still open for further opinions.

have made over 1200hp on the dyno with a 6al, dont sell them too short

Just like a fuel system the ign is one area where overkill is not a bad thing. If the 6 is too small it will let you know it. I have seen combos that ran a 6 where it should have not worked and it did. Have seen other combos with a 7 and still have issues when they shouldnt.

If the cylinder pressure isnt crazy or your trying to light a big wet mixture like alky the 6 should be fine. We ran a 6 on the 306 for years with no issues, he bought a 7 and a better coil and it smoothed up the idle a bit but et slips were the same.

Another idea is buy a better ign and toss the old one in the trailer for a spare.

514Fox87 wrote:At what point does it become a good idea to change from a MSD 6AL to the 7AL? Is there horsepower to be had?

Just remember, the 7AL uses more electrical current so, if it is not supplied enough then the actual mixture igniting may be worse.

Thanks this is what I was wanting to know. The engine is an 11.5 to 1, I run 110 octane and don't use poweradders, although I will spray it at least once this year. Will probably wait till the 545 comes together.

never ran a 6 but we switched from a digital 7 to a new 8plus using the same coil and picked up almost a tenth in the 1/8th.

on Q16
with boost

I ran a stock Duraspark box well into the 8's @ 160 mph then changed to a Holley Prostrip Annihilator igntion system , never gained .001 , just was able to open the plug gaps up . I run in the 7's now and plan on getting into the 6's with it
Frank

richter69 wrote:Just like a fuel system the ign is one area where overkill is not a bad thing. If the 6 is too small it will let you know it. I have seen combos that ran a 6 where it should have not worked and it did. Have seen other combos with a 7 and still have issues when they shouldnt.

If the cylinder pressure isnt crazy or your trying to light a big wet mixture like alky the 6 should be fine. We ran a 6 on the 306 for years with no issues, he bought a 7 and a better coil and it smoothed up the idle a bit but et slips were the same.

Another idea is buy a better ign and toss the old one in the trailer for a spare.

right, im not saying the 6al is the best, im just saying its better then most think. nothing wrong with having more