With my small displacement and tight torque converter, spooling this monster is definitely challenging. Probably would go much better if I wasn’t so stubborn and went with a higher stall T/C. I just changed the stator in the T/C and the stall is now 2730 rpm (up 300 rpm) with an a/f ratio of .78 lambda (5.03:1). I found that the mixture had to be within 1 percent to achieve the highest stall speed out of the T/C. O2 correction is off. This is the stall speed without the nitrous assist. I’m tuning in the fuel map without the nitrous first. With the nitrous, it should add around 1,000 rpm to the stall. I’ve found, so far, that to maintain the steepest boost rise, the mixture is very critical. My fuel map is close, but not perfect. Still dialing it in. When a too-lean or too-rich spot on the map is hit during the boost rise, you can see the map rise reading slow until the mixture becomes optimum again. When I get the mixture consistent throughout the boost rise, it should be quicker and smoother.
The top end a/f ratio is coming in nicely also. I’m using .73 lambda (4.7:1) after the turbo is well spooled and the thing is amazing. At first with the new turbo, with the boost controller set at 24 psi and the wastegate cranked in tight, I would be able to reach 24 and it would control well. Now, with the mixture more optimum on the top end, the boost controller still set at 24 psi, the boost is spiking to 312 kPa and settling at 300 kPa for the rest of the run. I'll need to take some preload off of the wastegate now. The fuel pump booster is cranked all the way to 50% and the mixture looks safe (4.7:1) for 300 kPa.
Things are looking promising. I haven’t hit any walls yet that would appear to be limiting me yet (except traction issues

). After the fuel map is set, then there’s still the nitrous to tune in, the T/C stall to play with, torque converter feed control to try. One way or another I’ll make this work.
On one of the 300 kPa runs, after hitting 3rd gear, the car proceeded to do a burnout through the whole 3rd gear with me having to throttle the baby across the finish line. I'll be doing single passes until I have this car dialed in better. I'm thinking of putting a down force wing over the back of the car. I wonder how much they really work.