You've probably heard someplace before that nitrous systems have been around for a very long time. And in that period, they've proven themselves as reliable power adders time and again. But until now, nitrous systems had also not advanced much further than their original beginnings. The crew at Wilson Manifolds has changed all that by adding a whole new nitrous division to their lineup. Wilson's new Nitrous Pro Flow kits are much more than just another carb spacer with spray bars stuffed into it. What Keith Wilson, owner of Wilson Manifolds, and his team set out to do several years ago when development of the Pro Flow systems began was to re-engineer the way nitrous and fuel gets sprayed into the engine.

One of the biggest problems with many of the older nitrous plate designs is that it had trouble getting an equal amount of fuel and N2O into each runner. Of course, a lot of that also has to do with how well the intake manifold works, so don't expect a Pro Flow system to solve your problems if you're putting it on a swap-meet-special intake manifold that looks like two chipmunks tried porting it with jackhammers. Ideally, you'd want to match up a Nitrous Pro Flow system with a specially CNC-ported Wilson intake manifold, as we've done here. They're available from Edelbrock or Wilson directly to fit many performance engines. Check out the chassis dyno test we performed using a single-stage Pro Flow plate and some of its features we've highlighted here.

Pro Flow Single-Stage Plate TestWe tested the single-stage Pro Flow plate on a 12.5:1, 531-cid Chevy Rat built for racing that was installed in a 10.5-tire car strapped onto Westech's Superflow chassis dyno. The computer tells us that the plate added 364 hp (estimated) at the flywheel and 300 hp at the tires. The horsepower gain was attained using the Wilson-recommended 350hp jetting (#110-nitrous, #110-fuel) and flowing Shell Racing's 118-octane gas at 7.5 psi. The test vehicle also featured a progressive nitrous controller, which is why the nitrous power increases mildly first, then spikes sharply above 6,000 rpm.

Test 1: Corrected Rear-Wheel Horsepower (CRWHP) motor only.
Test 2: Estimated Flywheel Horsepower (EFWHP) motor only.
Test 3: Corrected Rear-Wheel Horsepower (CRWHP) Pro Flow plate.
Test 4: Estimated Flywheel Horsepower (EFWHP) Pro Flow plate.
  1. 2. 3. 4.
  Motor only Motor Only Pro Flow Pro Flow
  CRWHP EFWHP CRWHP EFWHP
RPM        
5400 570 719 491 623
5600 608 767 576 728
5800 634 801 644 813
6000 665 841 704 887
6200 684 867 812 1,021
6400 698 886 898 1,128
6600 708 901 961 1,207
6800 714 911 982 1,234
7000 716 916 1,004 1,263
7200 714 916 1,013 1,277
7400 707 910 1,006 1,271
         
MAX 717 918 1,016 1,282
MAX NITROUS GAIN +299 hp +364 hp