Tom Wilson
April 6, 2011

On The Dyno

  5.4, 8 psi 5.0, 8 psi 8 psi vs. 8 psi 5.4, 12 psi 5.0, 12 psi 12 psi vs. 12 psi
RPM HP TQ HP TQ HP TQ HP TQ HP TQ HP TQ
2,500 199 418 180 379 -19 -39 223 468 n/a n/a n/a n/a
2,750 222 423 212 405 -10 -18 255 486 n/a n/a n/a n/a
3,000 250 437 242 423 -8 -14 287 503 n/a n/a n/a n/a
3,250 277 447 269 435 -8 -12 319 515 237 382 -82 -133
3,500 301 452 294 441 -7 -11 349 523 323 485 -26 -38
3,750 325 455 323 452 -2 -3 374 524 358 501 -16 -23
4,000 348 457 344 452 -4 -5 404 530 392 515 -12 -15
4,250 371 459 373 461 2 2 434 536 420 519 -14 -17
4,500 390 455 392 457 2 2 459 536 450 525 -9 -11
4,750 412 456 417 461 5 5 485 537 481 532 -4 -5
5,000 430 452 434 456 4 4 513 539 499 524 -14 -15
5,250 445 445 448 448 3 3 533 534 531 531 -2 -3
5,500 459 438 468 447 9 9 559 534 553 528 -6 -6
5,750 470 429 487 444 17 15 578 528 576 526 -2 -2
6,000 478 419 503 440 25 21 596 522 591 517 -5 -5
6,250 475 400 514 432 39 32 616 518 611 513 -5 -5
6,500 n/a n/a 528 427 n/a n/a n/a n/a 627 507 n/a n/a
6,750 n/a n/a 545 424 n/a n/a n/a n/a 640 498 n/a n/a
7,000 n/a n/a n/a n/a n/a n/a n/a n/a 650 488 n/a n/a

5.4 , 15 psi 5.0, 15 psi 15 psi vs. 15 psi 5.4, 18 psi 15 psi vs. 18 psi
RPM HP TQ HP TQ HP TQ HP TQ HP TQ
2,500 236 495 n/a n/a n/a n/a 248 521 n/a n/a
2,750 270 516 n/a n/a n/a n/a 283 541 n/a n/a
3,000 306 536 n/a n/a n/a n/a 324 567 n/a n/a
3,250 342 552 n/a n/a n/a n/a 356 576 n/a n/a
3,500 370 556 n/a n/a n/a n/a 385 578 n/a n/a
3,750 397 556 n/a n/a n/a n/a 417 584 n/a n/a
4,000 427 561 371 487 -56 -74 448 588 -77 -101
4,250 462 571 419 518 -43 -53 482 596 -63 -78
4,500 492 574 466 544 -26 -30 515 601 -49 -57
4,750 521 576 489 541 -32 -35 548 606 -59 -65
5,000 548 576 522 549 -26 -27 574 603 -52 -54
5,250 573 573 551 551 -22 -22 603 603 -52 -52
5,500 596 570 579 553 -17 -17 627 599 -48 -46
5,750 618 565 601 549 -17 -16 649 593 -48 -44
6,000 637 558 621 543 -16 -15 672 588 -51 -45
6,250 635 534 640 538 5 4 n/a n/a n/a n/a
6,500 n/a n/a 660 534 n/a n/a n/a n/a n/a n/a
6,750 n/a n/a 679 529 n/a n/a n/a n/a n/a n/a
7,000 n/a n/a 692 519 n/a n/a n/a n/a n/a n/a
7,100 n/a n/a 710 514 n/a n/a n/a n/a n/a n/a

Selected dyno runs from Kenne Bell’s voluminous testing regime are shown here. Careful attention to reducing variables makes this data accurate, but just the same, don’t bother picking one or two horsepower nits here. The trend to better power from the 5.0 at higher rpm is clear, and that’s the important point. Of course, the blown 5.4 looks pretty good in the midrange. Keep in mind that the first GT500 test was with the stock Eaton supercharger, while all the rest were with Kenne Bell’s 2.8H blower.

There is no 18 psi of boost run for the 5.0 because the two times the test car was tuned up that far, it blew up its oil pump. Yes, the oil pump. This happened because to get past 15 pounds of boost, a larger crankshaft pulley is needed, which means changing the integral harmonic dampener. Something in the aftermarket dampener and the oil pump didn’t get along, resulting in a shattered inner oil pump gear each time the larger aftermarket damper was tried. A stronger pump gear will soon be available to cure that problem.

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