I've been experimenting a long time with nozzle location for a more ideal homogeneous meth/water to air mixture. I know you guys have your nozzles in different places, I'm just trying to get an idea of where I should go next.
I've tried the following with the aid of silicone bung(s). All tests were performed with two 1.0mm Aquamist nozzles.
1) One in CP, one in IC out coupler.
2) One in CP, one in CP lower coupler (up pipe to CP).
3) Both in IC outlet. One on aft side, one 45* to driver side.
4) Both in IC outlet. One on aft side, one 45* to passenger side.
5) Both in CP, pre DV valves about 40* apart.
Everyone says that further upstream is best. Unfortunately, all circumstances except setup 5, resulted in most of the meth going to Bank 1, and you can hear the engine running rough at WOT. They all looked like the following:
![Click here to enlarge]()
Trims are great up until approx 4300 RPM where the divergence occurs. I'm thinking that the atomization is great until that point, where the meth streams begin to shear too severely afterward due to the narrow 2.5" coupling , essentially running the meth spray against the coupler instead of into the airstream. I think I calculated the air velocity to be ~42 ft/s at wot, using 2 mg/stk injector flow at 12.0 AFR. Seems plausible, but I've had a few beers.
I saw Dz put both nozzles in the CP lower coupler, about 30* apart and 4" apart upstream, I'm probably going to try that next. Not sure what else to do. Any ideas are welcome.
edit: I should say that I've flow tested the system many times. 600 mL/min is normal at 12V with a 15psi in-line check valve near the nozzles. Flow is even between the two nozzles.
I've tried the following with the aid of silicone bung(s). All tests were performed with two 1.0mm Aquamist nozzles.
1) One in CP, one in IC out coupler.
2) One in CP, one in CP lower coupler (up pipe to CP).
3) Both in IC outlet. One on aft side, one 45* to driver side.
4) Both in IC outlet. One on aft side, one 45* to passenger side.
5) Both in CP, pre DV valves about 40* apart.
Everyone says that further upstream is best. Unfortunately, all circumstances except setup 5, resulted in most of the meth going to Bank 1, and you can hear the engine running rough at WOT. They all looked like the following:
Trims are great up until approx 4300 RPM where the divergence occurs. I'm thinking that the atomization is great until that point, where the meth streams begin to shear too severely afterward due to the narrow 2.5" coupling , essentially running the meth spray against the coupler instead of into the airstream. I think I calculated the air velocity to be ~42 ft/s at wot, using 2 mg/stk injector flow at 12.0 AFR. Seems plausible, but I've had a few beers.
I saw Dz put both nozzles in the CP lower coupler, about 30* apart and 4" apart upstream, I'm probably going to try that next. Not sure what else to do. Any ideas are welcome.
edit: I should say that I've flow tested the system many times. 600 mL/min is normal at 12V with a 15psi in-line check valve near the nozzles. Flow is even between the two nozzles.