Last month, we installed a ProCharger LSx Serpentine Drive Kit (LSx SDK) with their D-1SC supercharger onto a factory LS3. As promised, we put it to the test at Westech Performance Group’s SuperFlow 902 dyno to see what kind of tire-fryin’ power can be had. Out of the box our naturally aspirated LS3 managed to generate 501 hp. The D-1SC system certainly didn’t disappoint, but we’ll get to the power figures shortly.

We started with a Chevrolet Performance LS3 crate engine and the Corvette Accessory Drive System (“LS3 Heat,” Aug. ’12 issue). This package comes with mounting brackets, belt, power steering pump, water pump, and alternator. On the downside, since this setup works off a single belt, we ended up removing the belt to avoid burning up the power steering pump by running it dry; this also meant we had to switch over to an electric water pump.

When it came to the power adder, our system of choice was ProCharger’s LSx SDK with the optional D-1SC blower upgrade. This all-in-one setup also comes with an air-to-air intercooler, an assortment of 3-inch mild steel tubes, a blow-off valve, silicone tubes, and an ample supply of hose clamps. This particular system is an LS transplant setup and is capable of fitting into a ’66-72 A-body (Chevelle, GTO), ’68-72 Nova, and a ’68-81 F-body (Camaro/Firebird); you just have to cut the tubes to fit your specific application.

Moving onto the juicy details, with nothing more than a healthy ProCharger D-1SC huffer, our factory mill produced 714 hp at 6,500 rpm and 620 lb-ft at 5,600 rpm with pump gas. A couple of pulley swaps later and 100-octane fuel and we further improved those numbers to 768 hp at 6,500 rpm and 667 lb-ft at 5,400 rpm—yeah, no complaints here! The next time you see our boosted LS, we’ll show you what a top end swap with a much more aggressive camshaft will produce. Any guesses?

Power Figures

Our ProCharger system came with three pulleys (4.75, 4.50, and 4.25 inches) and we started off with the 4.75-inch pulley. With 18 degrees of total timing, the 4.75-inch pulley produced 11 psi of boost on 91-octane pump gas, generating 714 hp at 6,500 rpm and 620 lb-ft at 5,600 rpm. For the next pull, we bumped the timing up to 20 degrees, only to have it drop power across the entire powerband. As Mena put it, “18 degrees is the sweet spot.”

We then swapped over to the 4.5-inch pulley. With the expected increase in power and to lean more toward the cautious side, we changed over from the factory spark plug to a colder set of Champion S63A and added 100-octane fuel. Keeping the timing at 18 degrees, the LS3 then produced 736 hp at 6,500 rpm and 634 lb-ft of torque at 5,500 rpm with 12 psi.

For our final pulls, we stepped up to the 4.25-inch pulley and at this point, it was anyone’s guess for the final numbers. This time, the little pulley made 13.3 psi and turned out a stellar 768 hp at 6,500 rpm and 667 lb-ft of torque at 5,400 rpm. Even more impressive, the D-1SC packing LS3 averaged of 601 hp and 625 lb-ft of torque from 3,500 to 6,500 rpm.

The Goods

PN Components
1LS100-SCI ProCharger LSx Serpentine Drive Kit

Power Figures

4.75-inch pulley
RPM LB-FT HP BOOST
3,500 491 327 2.9
3,600 491 336 3.1
3,700 501 353 3.4
3,800 516 374 3.5
3,900 530 393 3.6
4,000 540 411 3.7
4,100 552 431 4
4,200 563 451 4.2
4,300 574 470 4.4
4,400 586 491 4.6
4,500 594 509 4.8
4,600 600 526 5.1
4,700 605 541 5.3
4,800 607 555 5.4
4,900 609 568 5.6
5,000 611 581 5.9
5,100 612 594 6.3
5,200 613 607 6.6
5,300 614 620 6.9
5,400 617 634 7.1
5,500 619 649 7.2
5,600 620 662 7.5
5,700 619 672 7.8
5,800 616 680 8.2
5,900 613 689 8.6
6,000 610 697 8.9
6,100 605 702 9.2
6,200 598 706 9.6
6,300 591 709 10.1
6,400 584 711 10.7
6,500 577 714 11
Max lb-ft 620 @ 5,600
Max hp 714 @ 6,500
Avg. lb-ft 583
Avg. hp 560

Power Figures

4.50-inch pulley
RPM LB-FT HP BOOST
3,500 495 330 3.4
3,600 498 341 3.6
3,700 510 359 3.8
3,800 526 381 4.1
3,900 539 400 4.4
4,000 550 419 4.6
4,100 561 438 4.8
4,200 577 461 5
4,300 586 480 5.2
4,400 596 499 5.4
4,500 604 518 5.6
4,600 611 535 5.8
4,700 617 552 6.1
4,800 621 567 6.4
4,900 623 582 6.6
5,000 626 596 6.9
5,100 626 608 7.2
5,200 627 621 7.6
5,300 629 635 8
5,400 633 651 8.3
5,500 635 665 8.6
5,600 634 676 8.9
5,700 632 686 9.3
5,800 631 697 9.5
5,900 630 707 9.9
6,000 627 716 10.4
6,100 622 722 10.7
6,200 616 727 10.9
6,300 609 731 11.4
6,400 602 734 11.9
6,500 595 736 12
Max lb-ft 635 @ 5,500
Max hp 736 @ 6,500
Avg. lb-ft 596
Avg. hp 573

Power Figures

4.25-inch pulley
RPM LB-FT HP BOOST
3,500 522 348 4
3,600 523 359 4.2
3,700 534 376 4.5
3,800 549 397 4.7
3,900 564 419 4.8
4,000 575 438 5.1
4,100 587 458 5.5
4,200 600 480 5.8
4,300 611 500 6
4,400 621 521 6.3
4,500 632 542 6.6
4,600 640 561 6.9
4,700 646 578 7.1
4,800 650 594 7.3
4,900 652 609 7.7
5,000 654 623 8.1
5,100 658 639 8.5
5,200 662 656 8.7
5,300 667 672 8.8
5,400 668 687 9.3
5,500 668 699 9.9
5,600 668 712 10.3
5,700 667 724 10.6
5,800 665 734 10.9
5,900 661 742 11
6,000 656 750 11.3
6,100 650 755 11.8
6,200 645 761 12.2
6,300 638 765 12.7
6,400 631 769 13.3
6,500 621 768 13.2
Max lb-ft 668 @ 5,500
Max hp 769 @ 6,400
Avg. lb-ft 625
Avg. hp 601

SOURCE
Westech Performance Group
Mira Loma
CA
951-685-4767
http://www.westechperformance.co
m
ProCharger
14801 W. 114th Terrace
Lenexa
KS  66215
913-338-2886
www.procharger.com
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