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cutout = less power

This is a discussion on cutout = less power within the General Help forums, part of the LSx Technical Help Section category; i dont know why but i have headers and full exhaust with a cutout. and it seem that their is ...

  1. #1
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    cutout = less power

    i dont know why but i have headers and full exhaust with a cutout. and it seem that their is more power with the cutout closed. i can feel it, why?

  2. #2
    Senior Member 98maro's Avatar
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    at the begining when i put it on i felt like there was more power with the cutout open, now i feel like it has more power when its closed..
    i had flow master before, now i have magnaflow.. i dont know if that made the difference

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    Senior Member Too Fast's Avatar
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    Your car may have *slightly* less torque at lower RPM, and *slightly* more top end HP, with the cut-out open. Only way to prove or disprove this is by going to a dyno, regardless of anyone's opinion.

    My guess is that you are a bit scared of all the beautiful sound with the cutout open, so therefore you are a bit more timid with the go-pedal that way.

    (J/K!)

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    Senior Member cpop98ws6's Avatar
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    My car made 428rwhp and 421rwtq with the cut out closed.
    Open it made 430rwhp and 427rwtq.

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    O U 8 1 2 Spaz's Avatar
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    most likely it's psychosomatic... the change in HP or TQ would be so minor that you really wouldn't be able to feel the difference... what other mods do you have done???

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    Senior Member Too Fast's Avatar
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    Quote Originally Posted by cpop98ws6 View Post
    My car made 428rwhp and 421rwtq with the cut out closed.
    Open it made 430rwhp and 427rwtq.
    Thank you for confirming a real world experience, instead of an opinion!

  7. #7
    dbl clutch'n like i shld WICKEDLS1's Avatar
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    my ss felt like it had less torque with it open but most of it is psychological because i would always think the motor is working harder just because its louder when its not

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    Senior Member cpop98ws6's Avatar
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    Quote Originally Posted by Too Fast View Post
    Thank you for confirming a real world experience, instead of an opinion!
    Not a problem, I tried to upload my dyno sheet but it wouldnt post to the site for some reason.

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    Army Dude robcas47's Avatar
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    When I had the TA dyno'd it only made +1 whp and even on tq . I dont have the sheet but the whp was 378 and I think 373 wtq with mods in sig. Of course my mpg is worse with the cut-out open since I enjoy the eargasms it gives me

    ASA Cam, Built A4, 3500 Stall, LT's, ORY, Hooker CB, E Cut-out, Lid, Modified SSRA, , SFC's,UMI Tq Arm w/relo, Spohn LCA's, 3.73's, Free Mods, Dyno tuned by James @ SpeedShift Performance. Need more suspension mods!!!

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    Senior Member cpop98ws6's Avatar
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    Dyno sheet, I will be back at the dyno before spring so I will get another comparison.
    Last edited by cpop98ws6; 02-02-2012 at 07:30 PM.
    Callies 383, Trick Flow 225, Rapid Motorsports Dominatior 2 X cam, ls6 ported oil pump,42lb injectors, FAST 92/92 , ASP underdrive pully, eletric water pump, Pacesetter LT's, Pacesetter ORY, Magnaflow catback, e-cutout, Yank SS 3600, Performabuilt stage 2 4l60e, Strange S60 ,4.10s, Detroit Truetrac, (UMI) - Adj. LCA, Adj. tunnel mount torque arm, Adj. panhard bar, Drag bar, subframe conectors, shock tower brace. 465rwhp-438rwtq 11.09@119.90.

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    Member mike171562's Avatar
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    My tuner told me he got like 18 more HP out of it with the cutout open, with a Flowmaster catback

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    Senior Member Too Fast's Avatar
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    ^^^and here's some more proof that for 4th gen F-bodies, the Flowmaster muffler is more restrictive than just about any other cat-back. On other cars, the results are different, of course!

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    Senior Member cpop98ws6's Avatar
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    I forgot to mention I have a Magnaflow catback.

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    Senior Member Too Fast's Avatar
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    Magnaflows are always well received here for their sound as well as the flow.

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    Senior Member cpop98ws6's Avatar
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    Dyno proven haha

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    What Would Earl Do? Vexzer's Avatar
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    With my long-tubes and Off Road Y feeding stock muffler, I lose ~15 HP by closing the cutout on the Dyno tester.

  17. #17
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    i have long tube Headers, ORY Pipe, cutout with a Flowmaster Super 10. and im untuned and my firend said that the only reason you can feel more power with the cutout closed, cause im not tune so the car is reading that i still have cat's and no cutout.

  18. #18
    What Would Earl Do? Vexzer's Avatar
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    Not sure what everyone means by "feels better" and then there are discussions about wether the cat's or lack of are affecting the driveability or state of tune (HP), It's worth stating that that at WOT there are is no learned trims or sensor feedback (except of course knock retards) that affect HP. At WOT the computer doesn't care (or know) if there are cat's or if the pipes are open. Gotta admit though, that running with the pipe open is a wonderful niose and great feeling.

  19. #19
    Senior Member cpop98ws6's Avatar
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    I feel no differnce with the cut out opened or closed.

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    that wired, cause i feel more pull from WOT

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