Tom Wilson
December 17, 2013

On The Dyno

While it's always fun to see what maximum power a blower can make, Kenne Bell offers so many superchargers, inlets and supporting systems that maximum power isn't a concern unless you're Jonesing for something in the 2,000hp range. Instead, it's more important to show which blower and inlet combination is most efficient for the intended power. Max efficiency gives the most power for the least cost, along with coolest, most detonation-resistant inlet temperatures.

As we've seen, the Two-Valve Mammoth system is maximized for somewhere in the 15- to 25-plus-pound boost range. To put that in perspective, here are some numbers from Kenne Bell Two-Valve tests.

RPM 2.1, 9 psi 2.1, 10 psi 2.8, 13 psi 2.8 LC Mammoth, 26 psi 2.1 vs. Mammoth
TQ HP TQ HP TQ HP TQ HP TQ HP
1,600 356.60 108.60 347.90 106.00 341.50 104.00 426.70 138.10 70.10 29.50
1,700 365.90 118.40 382.00 123.60 359.20 116.30 444.70 152.40 78.80 34.00
1,800 373.90 128.10 393.80 135.00 370.50 127.00 460.20 166.50 86.30 38.40
1,900 379.90 137.40 400.50 144.90 380.60 137.70 466.40 177.60 86.50 40.20
2,000 385.20 146.70 409.20 155.80 390.00 148.50 480.40 192.10 95.20 45.40
2,100 392.30 156.80 417.40 166.90 399.20 159.60 484.30 202.80 92.00 46.00
2,200 397.20 166.40 421.10 176.40 407.90 170.90 504.30 220.80 107.10 54.40
2,300 402.90 176.40 423.60 185.50 415.80 182.10 504.90 230.70 102.00 54.30
2,400 403.40 184.30 429.70 196.40 421.70 192.70 516.30 245.70 112.90 61.40
2,500 405.60 193.10 430.80 205.00 424.40 202.00 522.40 258.60 116.80 65.50
2,600 410.10 203.00 433.20 214.40 429.90 212.80 536.40 275.70 126.30 72.70
2,700 411.70 211.70 443.10 227.80 434.60 223.40 540.20 288.00 128.50 76.30
2,800 414.20 220.80 445.80 237.60 440.50 234.80 545.20 301.10 131.00 80.30
2,900 418.40 231.00 445.30 245.90 445.30 245.90 550.90 314.70 132.50 83.70
3,000 419.50 239.60 446.70 255.10 449.90 257.00 552.80 326.30 133.30 86.70
3,100 422.70 249.50 457.00 269.70 453.80 267.90 560.00 341.20 137.30 91.70
3,200 423.40 258.00 464.00 282.70 458.60 279.40 569.30 357.70 145.90 99.70
3,300 425.20 267.20 466.90 293.30 463.00 290.90 578.00 374.20 152.80 107.00
3,400 426.70 276.20 463.30 299.90 465.90 301.60 579.70 386.30 153.00 110.10
3,500 425.00 283.20 467.10 311.20 468.10 311.90 582.70 399.40 157.70 116.20
3,600 425.20 291.50 468.50 321.10 470.90 322.80 584.50 411.80 159.30 120.30
3,700 426.50 300.50 467.80 329.50 473.90 333.90 589.80 426.80 163.30 126.30
3,800 423.70 306.60 461.50 333.90 476.00 344.40 590.50 438.50 166.80 131.90
3,900 423.60 314.60 464.00 344.50 477.50 354.60 598.50 455.80 174.90 141.20
4,000 420.90 320.50 463.60 353.00 479.60 365.20 598.70 467.40 177.80 146.90
4,100 418.90 327.00 465.50 363.40 478.70 373.70 601.50 481.00 182.60 154.00
4,200 417.00 333.40 458.80 366.90 480.20 384.00 599.90 491.10 182.90 157.70
4,300 415.50 340.20 463.60 379.60 479.60 392.60 598.20 501.10 182.70 160.90
4,400 413.80 346.70 455.20 381.40 480.00 402.10 605.80 519.10 192.00 172.40
4,500 412.60 353.50 455.80 390.50 480.30 411.50 603.60 528.60 191.00 175.10
4,600 407.50 356.90 457.20 400.40 479.20 419.70 608.70 544.70 201.20 187.80
4,700 404.70 362.20 459.80 411.50 480.80 430.30 604.00 552.00 199.30 189.80
4,800 404.20 369.40 452.70 413.70 481.30 439.90 604.50 563.90 200.30 194.50
4,900 403.10 376.10 445.80 415.90 480.80 448.50 602.90 573.90 199.80 197.80
5,000 398.20 379.00 444.60 423.30 478.50 455.50 601.80 584.40 203.60 205.4
5,100 393.00 381.60 435.90 423.30 476.40 462.60 601.40 595.40 208.40 213.80
5,200 389.90 386.00 431.40 427.10 474.00 469.30 597.80 603.20 207.90 217.20
5,300 385.30 388.80 430.40 434.30 471.90 476.20 600.10 617.00 214.80 228.20
5,400 379.50 390.20 421.60 433.40 470.50 483.70 600.50 628.80 221.00 238.60
5,500 377.00 394.80 415.80 435.40 468.00 490.00 598.30 638.00 221.30 243.20
5,600 373.90 398.70 416.40 444.00 465.90 496.70 594.40 645.10 220.50 246.40
5,700 363.20 394.20 411.60 446.70 460.80 500.10 588.90 650.40 225.70 256.20
5,800 361.60 399.40 409.90 452.70 457.80 505.50 584.10 656.20 222.50 256.80
5,900 354.40 398.20 403.90 453.80 454.50 510.60 580.60 663.30 226.20 265.10
6,000 345.20 394.30 394.90 451.20 452.10 516.50 580.40 674.10 235.20 279.80
6,100 323.90 376.20 357.80 415.50 449.00 521.40 579.20 683.80 255.30 307.60
6,200 n/a n/a n/a n/a 438.80 518.00 573.90 688.50 n/a n/a
6,300 n/a n/a n/a n/a n/a n/a 569.80 694.40 n/a n/a
6,400 n/a n/a n/a n/a n/a n/a 566.60 701.20 n/a n/a

On The Dyno, continued

Supercharger Boost HP Notes
None 0 245 Stock baseline
2.1 9 431 Standard KB 4.6 Two-Valve kit
2.1 10 453 With 75mm Big Tube inlet
2.1 15 507 Standard KB kit with 15 lb pulley.
2.8 15 572 Two-Valve Mammoth kit
2.8 26 703 Two-Valve Mammoth kit, optimized engine

Of special interest is the 15-pound tests comparing the 2.1 and 2.8 blowers (Standard vs. Mammoth kits). The extra 65 hp from the 2.8-liter supercharger is obviously not from boost as both were turning out the same amount; the power gain indicates the intake's greater efficiency and the reduced power it takes to drive the larger supercharger at that boost level. In short, it takes less power to drive the larger 2.8 blower to 15 pounds of boost than it does to get the same pressure out of a smaller, faster-turning 2.1 breathing through a more restrictive intake. Less power lost to driving the supercharger means more power to the rear tires, and that's why the Two-Valve Mammoth kit uses larger superchargers.

While not shown in this data, the 2.1 standard kit is fiscally far more efficient than the Mammoth kits are at pump-gas, daily driven levels, and the power advantage to the Mammoth is minimal at such easy-going tunes. We show the useful dyno tests from the standard 2.1 and 2.8 Mammoth kits. As is typical, the precise maximum power and torque figures in the charts don't necessarily line up with those in the text because the maximums fall between the 100-rpm increments shown in the charts.


Boost Economics

When we say the standard 2.1 blower is less expensive than the Mammoth kits, we mean the Mammoth kit costs noticeably more than the standard kit. The Mammoth kit is not as complete as the standard kits so the ultimate price is higher yet. That's because the standard kits are complete kits, so they include everything needed to bolt on the supercharger and make it run, while the tuner kits are designed for pro installation or on already modified vehicles, so the injectors, hand-held tuner, tune, Boost-A-Pump and in some cases the drive belt, are not included in the KB kit and will have to be accounted for separately.

Standard
Kit Price Notes
2.1 $3,899 Complete kit, non-intercooled
2.1 cooled $4,999 Complete kit intercooled
Mammoth
Kit Price Notes
2.6 $6,199 Tuner kit, does not include injectors, tuner, BAP or drive belt
2.8 $6,299 Tuner kit, does not include injectors, tuner, BAP or drive belt
2.8 LC $6,599 Tuner kit as above, adds Liquid Cooled supercharger

Note: All Mammoth kits are intercooled; the Liquid Cooled supercharger is not intercooling (see photos). Kenne Bell offers Boost-a-Pumps at $239 or $259; drive belts are $46 for six-rib and $76 for eight-rib. KB does not sell injectors, but they are typically $365-$465 for this application from other vendors. Polished superchargers are $500 extra; an eight-rib belt upgrade is $699.