4" QTEC on 4" Catback Dyno Numbers
#1
4" QTEC on 4" Catback Dyno Numbers
We just built a 402 recently(there is a thread about the motor) and got some open vs closed dyno number with our 4 " electric cutout. This is a 402 with 1 3/4" HVMC headers our 3" Off Road Y Pipe going through a 4" Mufflex Catback with our 4" Quick Time Electric Cutout.
We wanted to see what gains would be on what is thought to be one of the best catbacks out there.
10.5 HP Gain Peak
12 TQ Gain Peak
15HP and 18.4TQ Gain at 4300
And it averaged 9.9hp gain and 10.8 TQ gain. Averaged!
Enjoy
RPM HP Closed TQ Closed HP Open TQ Torque HP Diff TQ Diff
3100 234.2 396.8 236.9 401.3 2.7 4.5
3200 246.1 404.0 248.1 407.1 2.0 3.1
3300 260.6 414.7 258.7 411.7 -1.9 -3.0
3400 272.6 421.1 269.8 416.7 -2.8 -4.4
3500 284.8 427.4 284.2 426.5 -0.6 -0.9
3600
3700
3800 318.4 440.0 327.2 452.2 8.8 12.2
3900 326.0 439.1 338.4 455.7 12.4 16.6
4000 336.3 441.6 349.6 459.1 13.3 17.5
4100 347.8 445.6 360.9 462.3 13.1 16.7
4200 362.3 453.1 375.5 469.5 13.2 16.4
4300 376.7 460.1 391.7 478.5 15.0 18.4
4400 391.6 467.4 405.4 483.9 13.8 16.5
4500 405.6 473.4 418.7 488.7 13.1 15.3
4600 414.3 473.1 429.9 490.8 15.6 17.7
4700 425.3 475.2 437.4 488.8 12.1 13.6
4800 433.9 474.8 446.1 488.1 12.2 13.3
4900 440.7 472.3 452.2 484.7 11.5 12.4
5000 447.1 469.6 458.5 481.6 11.4 12.0
5100 453.6 467.2 463.6 477.4 10.0 10.2
5200 460.9 465.5 472.4 477.1 11.5 11.6
5300 464.1 459.9 476.9 472.6 12.8 12.7
5400 470.8 457.9 479.4 466.2 8.6 8.3
5500 473.4 452.0 483.0 461.2 9.6 9.2
5600 476.8 447.1 490.7 460.3 13.9 13.2
5700 484.3 446.3 497.4 458.3 13.1 12.0
5800 490.8 444.5 501.0 453.6 10.2 9.1
5900 495.1 440.7 505.7 450.2 10.6 9.5
6000 495.4 433.6 505.9 442.8 10.5 9.2
6100 476.6 410.4 490.8 422.6 14.2 12.2
Avg Gain 9.9HP 10.8TQ
We wanted to see what gains would be on what is thought to be one of the best catbacks out there.
10.5 HP Gain Peak
12 TQ Gain Peak
15HP and 18.4TQ Gain at 4300
And it averaged 9.9hp gain and 10.8 TQ gain. Averaged!
Enjoy
RPM HP Closed TQ Closed HP Open TQ Torque HP Diff TQ Diff
3100 234.2 396.8 236.9 401.3 2.7 4.5
3200 246.1 404.0 248.1 407.1 2.0 3.1
3300 260.6 414.7 258.7 411.7 -1.9 -3.0
3400 272.6 421.1 269.8 416.7 -2.8 -4.4
3500 284.8 427.4 284.2 426.5 -0.6 -0.9
3600
3700
3800 318.4 440.0 327.2 452.2 8.8 12.2
3900 326.0 439.1 338.4 455.7 12.4 16.6
4000 336.3 441.6 349.6 459.1 13.3 17.5
4100 347.8 445.6 360.9 462.3 13.1 16.7
4200 362.3 453.1 375.5 469.5 13.2 16.4
4300 376.7 460.1 391.7 478.5 15.0 18.4
4400 391.6 467.4 405.4 483.9 13.8 16.5
4500 405.6 473.4 418.7 488.7 13.1 15.3
4600 414.3 473.1 429.9 490.8 15.6 17.7
4700 425.3 475.2 437.4 488.8 12.1 13.6
4800 433.9 474.8 446.1 488.1 12.2 13.3
4900 440.7 472.3 452.2 484.7 11.5 12.4
5000 447.1 469.6 458.5 481.6 11.4 12.0
5100 453.6 467.2 463.6 477.4 10.0 10.2
5200 460.9 465.5 472.4 477.1 11.5 11.6
5300 464.1 459.9 476.9 472.6 12.8 12.7
5400 470.8 457.9 479.4 466.2 8.6 8.3
5500 473.4 452.0 483.0 461.2 9.6 9.2
5600 476.8 447.1 490.7 460.3 13.9 13.2
5700 484.3 446.3 497.4 458.3 13.1 12.0
5800 490.8 444.5 501.0 453.6 10.2 9.1
5900 495.1 440.7 505.7 450.2 10.6 9.5
6000 495.4 433.6 505.9 442.8 10.5 9.2
6100 476.6 410.4 490.8 422.6 14.2 12.2
Avg Gain 9.9HP 10.8TQ
#2
LS1 Tech Administrator
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Barry, your thread is just in time. I am planning on upgrading my exhaust soon. I lose approximately 18 rwhp between open headers and a fully closed exhaust. Even with your 3" cutout, I still lose 6 rwhp compared to open headers (with extensions). I look forward to trying out the 4" cutout on my F-Body in the near future.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
#7
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4" mufflex catbacks are terrible this is no suprise to me. thats why I hacked off my muffler and put in a magnaflow race muffler hehe. Of course I am also using your 1-7/8s LTs with dual cutouts, but they are just for sound, I ran 9s with them closed, but I should try with them open, not sure it will make that much of a difference until I get to the 900 hp level.
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#9
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Originally Posted by algws6
yup, my 4" mufflex robbed me about the same.
Brandon
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Originally Posted by dug
Have any soundclips nick?
http://www.blackssei.com/nick/NickN997Small.wmv