Super Intake Shootout
GT-40 vs. TFS R
A number of things are obvious from this graph. The first thing is that the TFS R made a great deal more power than the same motor equipped with a GT-40. Though 25 extra horsepower is nothing to sneeze at, the extra power was only available after 5500 rpm. Up to 5550 rpm, the modified GT-40 showed some pretty impressive gains from 3300 rpm all the way to 5550 rpm. Time and time again, the GT-40 continues to impress, though the TFS R intake clearly made more top-end power on this high-revving 347.
GT-40 Vs. Holley Systemax II
The Holley SysteMax bested the GT-40 by 5250 rpm, much earlier than the TFS R intake. Though the Holley offered a better torque curve, the additional torque production did not cost any top-end power. The Holley was only down by 1 hp compared to the TFS R intake. Like the TFS R, the Holley was down substantially to the GT-40 in the low and mid-range.
347 Test Motor Specs
•Block - 2-bolt 5.0
•Crank - Cast 3.40-inch 347-Coast High Performance
•Rods - 5.40-in. Steel H-Beam- (CHP)
•Pistons - Forged 10.5:1 5.0 Probe (11.5:1 with milled heads)
•Cam - XE 292R (Comp Cams)
•Lift - .621 in, .627 ex (.016, .018 lash)
•Duration - 254 in, 260 ex
•Lobe Center - 110
•Heads - AFR 185 (CNC ported & milled)
•Valves - 2.02-in, 1.60-ex
•Rockers - Comp Cams 1.6 ratio roller
•Intake - GT-40
•Throttle Body - 70 mm Accufab MAF - 77mm ProM (36 lb. calibration)
•Computer - EEC IV plus Ford Racing Extender
•Injectors - 36 lbs.-hr.
•Ignition - MSDHeaders - 13/4-inch full length Hooker
•Water Pump - Electric CSI
•Timing - 34* Total
TEST 1 -- GT-40 Intake-Baseline
•Peak Power Numbers: GT-40 Intake CHP 347-AFR heads & XE292R cam
•Peak Horsepower-GT-40 450 hp @ 6600 rpm
•Peak Torque-GT-40 447 lbs.-ft. @ 4700 rpm
Engine GT-40
RPM HP HP Tq Tq
3000 NA NA/td>
3200 NA NA
3400 263 406
3600 289 421
3800 314 434
4000 334 438
4200 351 439
4400 370 442
4600 388 444
4800 408 447
5000 424 445
5200 433 437
5400 438 427
5600 441 414
5800 438 396
6000 434 379
6200 437 371
6400 447 367
6600 450 358
TFS R INTake
Peak Power Numbers: GT-40 Intake vs. TFS RCHP 347-AFR heads & XE292R cam
Engine GT-40 Holley GT-40 Holley
RPM HP HP Tq Tq
3000 NA 201 NA 351
3200 NA 218 NA 358
3400 263 242 406 374
3600 289 268 421 391
3800 314 288 434 399
4000 334 307 438 403
4200 351 330 439 412
4400 370 351 442 419
4600 389 368 444 420
4800 408 384 447 420
5000 424 400 445 420
5200 433 416 437 420
5400 439 430 427 418
5600 441 446 414 418
5800 438 458 396 414
6000 434 466 379 408
6200 437 472 371 400
6400 447 475 367 390
6600 450 470 358 374
Peak Horsepower -- GT-40 450 hp @ 6600 rpm * Peak Horsepower -- TFS R 475 hp @ 6500 rpm * Peak Torque -- GT-40 447 lbs.-ft. @ 4700 rpm * Peak Torque -- TFS R 422 lbs.-ft. @ 5100 rpm
GT-40 vs. Edelbrock Victor 5.0
The graph comparison between the Edelbrock Victor 5.0 and the GT-40 looks a lot like the comparison between the TFS R and the GT-40. In fact, with the exception of the extra power produced by the Victor 5.0 available from 6400 rpm to 6700 rpm, the TFS R and Edelbrock traded blows all the way up the power band. Like the TFS R intake , the Victor 5.0 lost power compared to the GT-40 all the way up to 5550 rpm. At that point, the Edelbrock stormed away in terms of power production.
TFS R vs. Holley
Note the significant humps in the torque curve offered by the Holley manifold. The Holley bested the TFS intake all the way up to 6300 rpm, where the TFS manifold took the power lead by the smallest of margins.
Victor 5.0 vs. Holley
The story was repeated in a comparison between the Holley and the Edelbrock, though the differential was not quite as dramatic as with the TFS manifold. The Holley offered more power and torque throughout the range up to 6100 rpm, where the Edelbrock turned the tables to the tune of 13 hp at 6600 rpm. It is possible that the Edelbrock intake requires an even wilder motor combination to fully realize its potential.
Holley SysteMax II
•Peak Power Numbers: GT-40 Intake vs. Holley SysteMax II
•CHP 347-AFR heads & XE292R cam
•Peak Horsepower-GT-40 450 hp @ 6600 rpm
•Peak Horsepower-Holley 474 hp @ 6300 rpm
•Peak Torque-GT-40 447 lbs.-ft. @ 4700 rpm
•Peak Torque-Holley 436 lbs.-ft. @ 5300 rpm
Engine GT-40 Holley GT-40 Holley
RPM HP HP Tq Tq
3000 NA NA NA NA
3200 NA 217 NA 356
3400 263 247 406 382
3600 289 269 421 393
3800 314 293 434 404
4000 334 319 438 419
4200 351 342 439 428
4400 370 354 442 422
4600 389 368 444 421
4800 408 389 447 425
5000 424 410 445 431
5200 433 431 437 436
5400 439 445 427 433
5600 441 457 414 428
5800 438 466 396 422
6000 434 469 379 411
6200 437 472 371 399
6400 447 473 367 388
6600 450 468 358 372
EDELBROCK victor 5.0
The Edelbrock Victor 5.0 posted the highest peak horsepower numbers, generating 481 hp at 6600 rpm. The 426 lbs.-ft. placed it above the TFS R but below the Holley in terms of maximum torque output.
•CHP 347-AFR heads & XE292R cam
•Peak Horsepower-GT-40 450 hp @ 6600 rpm
•Peak Horsepower-Victor 5.0 481 hp @ 6600 rpm
•Peak Torque-GT-40 447 lbs.-ft. @ 4700 rpm
•Peak Torque-Victor 5.0 426 lbs.-ft. @ 4900 rpm
Engine GT-40 Victor GT-40 Victor
RPM HP HP Tq Tq
3000 NA 192 NA 336
3200 NA 209 NA 342
3400 263 238 406 367
3600 289 264 421 385
3800 314 288 434 397
4000 334 311 338 408
4200 351 327 439 409
4400 370 345 442 411
4600 389 366 444 417
4800 408 386 447 422
5000 424 404 445 424
5200 433 419 437 423
5400 439 433 427 421
5600 441 444 414 416
5800 438 456 396 413
6000 434 464 379 407
6200 437 474 371 401
6400 447 478 367 392
6600 450 481 358 382
