SCORE Journal - The Official Publication of SCORE Off-Road Racing
Issue link: http://read.uberflip.com/i/693984
EFI INTAKE TEST- LS1 VS FAST LSXR- MODIFIED 6.0L Truth be told, the stock LS1 intake was low many on the factory totem pole and will offer the least power of any of the factory pieces. The early truck, Trail Blazer SS and LS6 intakes all offer improved power over the CARBURETED INTAKE TEST: EDELBROCK PERFORMER RPM VS VICTOR JR.- MODIFIED 6.0L This test was run on the same modified 6.0L test motor as Graph 4 (Air Flow Research cylinder heads, Comp cam and forged internals), but this test involved carburetion. This test demonstrated the quintessential single vs dual-plane intake power curves. Dual-plane intakes were designed to provide a broad torque curve, while single-plane manifolds focus power production higher in the rev range. The dual-plane suffers slightly at the top of the rev range compared to the single plane, but the opposite is true at lower engine speeds. The dual-plane generally offers LS1 intake, with the Trail Blazer offering the best power gains of the bunch. This test involved a comparison between the LS1 and a Fast LSXR (102mm) intake and throttle body on a modified 6.0L. The 6.0L featured forged internals from CP and Carrillo along with a healthy Comp 469 Cam-(.617/.624 lift, 231/247 duration and 113 lsa) and AFR LSX 230 V2 heads. Run with the LS1 intake, the 6.0L produced 535 hp at 6,900 rpm and 468 lb-ft of torque at 5,100 rpm. After installation of the Fast LSXR intake and 102-mm throttle body, the power jumped to 590 hp at 6,800 rpm and 505 lb-ft of torque at 5,600 rpm. The right intake for the combination is critical for power production. much more torque and that is exactly what this test showed. Run with the dual-plane Edelbrock Performer RPM, the modified 6.0L produced 544 hp at 6,900 rpm and 470 lb-ft of torque at 4,300 rpm. The single-plane Victor Jr. countered with 552 hp at 7,000 rpm and 463 lb-ft at 5,200 rpm. Note the substantial torque gains offered by the Performer RPM below 4,800 rpm, but the Victor Jr. only bettered the RPM by a handful of horsepower at the top. The choice comes down to where you want your power production. 087 SCORE JOURNAL