DragStuff

Is anyone spraying with 15:1 or higher compression, and how much?

My motor is almost 15 to 1, probaly a little less, and I spray a 32 jet on it. Supposedly around 300 hp. I see engines all the time at 15 to 1 with alot on them. With high cr your nitrous tune up is less forgiving though.

agreed with post, when i had my 572 built, my builder said he was working on a 632 with 15:1 compression to be set up with a 400 shot of nitrous in the works for a customer....

If i am at 15:1 compression and 36 degrees timing what should I pull out of it for a 200 shot?

99camaro wrote:If i am at 15:1 compression and 36 degrees timing what should I pull out of it for a 200 shot?

I would pull it back to 28 deg.

id think 36 degrees is quite a bit for15 to 1 compression.id think on motor u should be like 31 or 32....anyone know for sure?i prob would think 28 with his motor and 200 squirt is right on upper side eh?????

99camaro wrote:If i am at 15:1 compression and 36 degrees timing what should I pull out of it for a 200 shot?

More than you think it needs...~ 24-26* or so. Keep it lean and work your way into the heat adding timing till you get the mark on the plug looking good.

I have a 632ci with two stages. 14.5:1 compression. Initial timing 32*. First stage is a 400hp shot and I pull 11*. Second stage is 300 hp in at .4 secs and I pull another 5* leaving 16* total.