GREAT forum! can someone please elaborate on the "square" jetting thing for a hapless, rank amateur? through my reading, i've stumbled upon this and would like to hear more about this technique. thanks Duke
Yes, nvr go out and run lean as a guy who has slowly and carefully achieved after lots of tuning time. However, also do not just run the nos base tune up without question. I've been helping a buddy who is kind of new to nitrous (and I'm not an expert like Monty) and he was running a 225 shot with the nos baseline tune up and 7.5 psi fuel pressure. He was piggggggggg rich, went from 11.0 na to 10.40's on a 225 shot. We took his fuel pressure down to 6 psi (still plenty) and went up a size or two on the nitrous jet, next pass 9.88 - he was still a little rich too. AND - don't forget many a piston has broke from being too rich. So, read plugs, read plugs, read plugs and tune it slowly and carefully! There is an excellent plug reading article on this site, check it out. Just my 2 cents.Monty Mikho said:Duke you are right on the money to follow the NOS guidelines. Everyone has the trick of the week.. Best bet is to start safe and lean it out a little. I would not try tilting the tune up on it as it will not net you that much more in ET. Have fun and race.. You're on the right track..
No shit...why is it such a big deal not to go too far down on the compression ring??? I believe what you are saying, I just thought the fuel would get trapped on top of the compression ring, then leak past it and then start tearing shit up from there.Monty Mikho said:Trust me I am not a pro at this stuff.. I have broken my fair share of stuff and Im sure I would continue to do it if I still was using nitrous..
YDLUZ, the fuel actually gets trapped between the first and second ring. It is the reason the top ring will usually be push up and the second ring down. The first ring land usually pushes upwards also.. I have a garage full of examples.. LOL...
We are on the same page and if we were not you would be right, I'm 99% sure of that - I say that out of respect for your knowledge!Monty Mikho said:The problem is when the rings are too far up the pistons. They are moved down the piston to keep them away from heat. High nitrous usage pistons usually use around .300" - .350" down.. Some go as far as .450" down.. If your rings are seeing too much heat, its a good idea to move them down.. But remember you may run into compression height problems if moved too far..