backfire and bb's on tin roof

Originally Posted by jimdrechsler

someone told me that i could spray with a little higher timing with the jacobs ignition sysytem i have (i think i remember correctly?) i havent sprayed this year yet though. timng is still at 12, and havent had a chance to check plugs. would retarding the timing that much make it feel more sluggish?

ALSO- after setting the timing. do i turn the car off first, THEN attach the plug? or, attach it, then turn off the car. i did the aforementioned!

When setting your timing, it doesn't matter when you put the plug thing back in. The car can be off...or you can leave it running the entire time. Doesn't make a difference. Do what Jester said with the timing thing...retard it down...then gradually advance from 10 to 12, & so on. But even with an aftermarket ignition system like your Jacobs...never run your timing over 10 degrees with the nitrous! Never. 8 or 9 degrees would be even safer. If you're only doing a 75 shot I'd say 10 degrees is fine. But with a 100 shot or higher definitely put it down to 8. Better to be safe than sorry.
Also, what are your plugs gapped at? Normally you can open up the gap some with an aftermarket ignition, such as your Jacobs. The stock gapping is .054...with an aftermarket ignition you can open it up to .060...some guys even go to .065. But since you're running nitrous you'll want to find a happy medium. I'd stick with somewhere around the stock plug gap, between .050 - .055. I run a 150 dry shot of nitrous and have my plugs gapped at .050 with a Crane HI-6 Fireball ignition. Using nitrous with the stock ignition...you'd have to close the gap up even more...down to around .035.