The car puts out 320.7rwhp and 324.4rwtq NA. With the N20 it made 425.5rwhp and 544.8rwtq with the 150 jets. Only one pull was made because we needed to relocate the nozzle, because it was not a straight shot so it was going lean untill the motor got up in the rpms and then it was sucking the gas in. Overall not to bad but i was expecting 450-475rwhp. Who knows maybe with the nozzle relocated and alittle bit of dyno tuning it will get there. What do you think?

 

What kit are you using? wet/dry. It important to have the nozzle spary in the right location.

Vinny

 

NX wet kit# 20920

 

Is nozzle direction or angle as critical on dry kits as wet kits? Just curious cause my nozzle isn't a straight shot into the TB on my dry kit and I have the same fuel curve. Lean at the beginning and then rich at the end.

Ken R 95Z

 

I think lean->rich is normal, because at the lower RPMs a lot more n2o is being sucked in, plus the stock PCM tends to add more fuel as the RPMs climb.

 

Any way to lean out the top end a bit without affecting the bottom end? With the wideband on the dyno, i'm going from about 14.5:1 when I first hit it down to about 11.5:1 at about 6000rpm. I'd like to lean it out a bit at the top end (more in the 12:1 range) and richen it up a bit on the bottom, but I don't think I can do that with just fuel jet changes on my dry kit without affecting the whole A/F curve along the whole rpm range. Just looking for suggestions. Thanks for the info.

Ken R 95Z

 

rogue-

Time for some tuning.

 

gta, I've been tuning. As a matter of fact, I was tuning on the dyno today. Got rid of a knock retard issue i've been having on both N/A and Nitrous runs. My A/F is great N/A. Nice and flat. I'm just trying to figure out why on the bottle it's a downward slope from lean to rich. It may be normal or it may not, but i've yet to read a post that states either. I can tune my program, but that won't affect my A/F with a dry kit. Your only left with the fuel jet to lean or richen things up, but a jet change is an across the board change. It won't flatten out my A/F readings. Would still like to hear suggestions though. Thanks.

Ken

 

How quickly does it transition from lean->rich?

I know that you can get a lean spike when the spray first hits if your fuel noid line is too long. N2O under the pressure it's at will fill the lines much faster than fuel.

So, you might try shortening your fuel line, or even lengthening your n2o line (after the noids).

Just another thought.

 

JSK, my A/F is a smooth transition throughout the run from lean to rich. It starts at about 13 to 14:1 then transitions down through the run to about 11.5:1 at the top end. I started seeing a quick spike at the beginning of the run when my bottle started going low. Will know this week if that was the cause when my bottle is filled. This is a dry kit, so only one nozzle and it's mounted in the intake elbow in front of the TB, but it does point at a bit of a downward angle cause the nitrous line is pushing up against the water pump. Have to move the nozzle back a bit. Any thoughs? Thanks.

Ken R.