KJ Jones
May 23, 2012
Photos By: KJ Jones

To say the dyno results from our intake swap are anything less than amazing would be the biggest understatement of the year. Project Leave It to Clevor picked up a solid 60 hp at the feet by simply removing Trick Flow's R Series EFI upper-intake plenum and replacing it with a Box R unit.

Of course, some tuning was necessary for achieving the mark, so we called on B&D Racing's Brian Schapiro for assistance in that area. Brian's nearly 20 years of experience with Anderson Ford Motorsports' PMS engine-management system has been huge for this project, as calibrations for naturally aspirated and nitrous-oxide performance have been spot-on every time. (For this effort, Brian only slightly modified his original WOT/dyno calibration for the Clevor, which resulted in the engine making just shy of 500 rear-wheel horses using Rockett Brand 100-octane fuel).

Conventional thought would lead one to think that taking away so much runner length (nearly 6 inches) would knock down rear-wheel torque by several lb-ft. As the data shows, this notion is totally dispelled for the Clevor engine.

Like the increased horsepower, torque with the new manifold is impressive. The peak hits 400 rpm in front of the torque generated with the R-Series plenum. Of course, with 3.73 gears and spool socked into the 8.8 rear of Greg's '89, we're pretty sure the tire-frying will be fairly instant through three gears whenever Greg nails the throttle on traction-limited pavement.

Here is the dyno graph that depicts the savage, naturally aspirated horsepower and torque that our project 408 Clevor is throwing at the rear tires of Greg Montoya's '89 GT. If you refer back to our report on the combination's initial dyno test ("Big-Steam Dream," Oct. '11; available at www.50mustangandsuperfords.com) and note the differences in the chart that accompanies this graph, you'll see that the switch to Trick Flow's Box R upper-intake plenum clearly made a big difference across the entire dyno run.

On The Dyno

R BOX R DIFFERENCE
RPM Power Torue Power Torque Power Torque
3,591281.14411.18307.36448.5326.2237.36
3,618284.72413.31309.57449.5124.8536.20
3,653288.48414.75314.35451.2125.8736.46
3,681292.00416.63316.50451.9524.5035.32
3,716295.50417.64320.67452.3625.1734.72
3,747299.24419.44322.71452.4523.4733.02
3,778302.87421.03326.79453.0923.9232.05
3,808306.08422.14328.89453.3622.8131.22
3,924318.25425.95339.41456.2521.1630.30
4,005326.46428.11352.34461.8125.8833.70
4,087332.96427.87360.72465.2427.7537.37
4,345348.00420.64378.20471.5830.2050.94
4,482356.90418.21392.79474.3535.8956.14
4,592366.04418.65400.67470.6634.6352.01
4,696376.63421.23405.90464.3529.2743.12
4,749382.32422.81413.26462.3930.9439.58
4,831390.23424.23416.34460.5326.1136.30
4,888394.81424.21424.49460.9129.6836.70
4,939398.37423.62429.69461.9731.3238.36
4,964399.97423.18433.19461.1133.2237.93
4,988401.58422.83436.13461.4334.5538.60
5,016402.76421.71437.32460.9334.5639.22
5,038404.25421.42441.28461.9537.0340.53
5,059405.49420.96442.60461.5937.1240.63
5,085406.30419.64444.34462.0238.0442.38
5,107407.24418.80446.61461.1939.3742.38
5,128408.33418.20448.23461.4139.9043.21
5,154409.37417.15450.73461.1841.3644.03
5,176410.01416.03451.07460.2741.0644.25
5,199410.30414.48453.65459.8643.3545.38
5,225410.73412.85455.00459.9944.2747.14
5,248411.57411.88457.02459.0345.4547.14
5,269412.33411.00458.81459.4246.4848.42
5,314414.22409.38460.88460.0146.6750.63
5,401417.62406.10465.20459.9447.5853.84
5,515421.13401.05473.95461.3152.8260.26
5,613423.26396.04489.18466.0265.9269.98
5,710423.71389.73489.23464.9765.5275.25
5,803423.20383.02489.23463.6366.0380.61
5,914422.29375.02489.70462.8267.4187.80
6,007424.22370.90490.41462.1666.1991.26
6,112428.13367.89n/an/an/an/a
6,215430.61363.89n/an/an/an/a
6,313431.97359.37n/an/an/an/a
6,405429.88352.50n/an/an/an/a
6,508418.24337.52n/an/an/an/a