Im running about 11.2 to 1 motor with heads, cam, etc. Last time I went to the dyno my a/f was between 12.9 and 13.1. A guy I talked to at NX said that was way too rich and I should be closer to 14.7 to 1??? The boggling part is Im running a dp kit, and The jets that they gave me were for a low pressure system, which I have and he said that those jet settings were for 1050 psi on the bottle and 9psi on the dedicated pump. Im only running about 4.5 psi and Im way too rich, generally around 11.0 and 10.5 especially above 6000. The crazy thing is Im running a 250 shot and only picking up about 150 to the wheels. Im pulling about 2-4 degrees out, running 112 sunuco fuel, and runnonh ngk iridiums which are 4 steps colder than stock. The pump im running is the holley blue. What should I do???
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Your airfuel is fine for motor. Do not lean it out more.
You need to be about 11.5 to 11.8 on the size shot you are running.
Yes NX does a 10 psi low pressure tune up. What jets are you running in your system?
Dave

 

for the 250 it is 28n 24f, and the 150 is 24n and 20f

 

Iridium is not the spark plug material of choice for N2O, stick with regular copper.

 

hmm, sounds weird. 4.5 on fuel press with those jets should make atleast 200 unless you have an issue.
the a/f sounds pretty close as well. seems like you may have an issue with somthing. motor problem somthing

 

Your only pulling 2-4 degrees of timing out for a 250 shot? That could be your problem. I think the general rule of thumb is 2 degrees for every 50 horsepower of nitrous.

 

im more of a 2* for every 75-100 hp depending on the compression and fuel choice

 

Noyzee, i wont be able to get to the dyno before I hit the track again, so should I bump the fuel up to 7psi and go from there, there plugs looked a little lean, but not much

 

I am, but keep in mind what fuel im running, my rich a/f, colder plugs, and dp kit

 

Yea my bad. I guess I'm used to runing pump gas.