10-15-2013, 05:28 PM | #1 |
Drives: 2010 Camaro (M6) 1000+ HP SBE Join Date: Jun 2011
Location: Houston
Posts: 1,391
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Forced Induction with Cutouts - Any Issues?
I am considering adding cutouts on my exhaust just for occasional fun, but want to know if anyone running boost and cutouts have had any issues.
I know of one other guy on the forum that I have corresponded with that said he gets a "backfire" when deceleration occurs (he has cutouts) but did not have this issue when he was just running a cam and headers. The backfire started after adding forced induction. I asked him if he had to do it all over again if he would still add them and he basically said it was great before adding boost, but now it was bad enough that he intends to change up his exhaust system. I am running a Maggie set at 10 psi and full Kooks headers/cats/mufflers, etc. My shop will install a set of cutouts for ~ $800. I would like to hear what you guys have to say first. Thanks! Biggfoot
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F-1X, Cog Drive, ATI Super Pulley/Sprag ~ 19 psi
Blower Cam Brodix BP BR 3 Heads Kooks LT Headers and full 3" exhaust Fore Triple Pump Fuel System with ID 1700X Injectors - E85 conversion DSS 9” Conversion (1400 hp axles, driveshaft, pumpkin) & Strange 3.70 gears McLeod RXT Twin HD Clutch & Upgraded Slave RPM Level VII TR6060 BMR Drag Suspension Package w/Strange shocks Carlyle 15" and M/T ET Street R radials 10.1 @ 143 mph 1/4 mile |
10-15-2013, 05:57 PM | #2 |
Drives: 2010 camaro Join Date: Aug 2009
Location: port st lucie ,florida
Posts: 4,273
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from what i heard, there were heat issues due to the boost and exhaust runs hotter...most people complained that motors went bad due to heat, anything running approx 600rwhp, i would prob not advise it..imo
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10-15-2013, 06:00 PM | #3 |
Drives: 2010 Camaro SS/RS 427ci Join Date: Jul 2009
Location: Bowling Green, Ky
Posts: 3,355
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No issues at all. Just dumping exhaust earlier
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10-15-2013, 06:15 PM | #4 |
Working on my 2nd one!
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I had no issues when I was running my Whipple & DMH combo, love that sound!
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10-15-2013, 06:20 PM | #5 |
Drives: 2SS RS Join Date: Mar 2010
Location: MD
Posts: 1,272
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I have QTPs with the whipple. It's loud as shit when you open them, like Earth shaking, life changing loud. I don't run them open often though.
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Livernois 2C cam and tune, LS3 conversion, Roto-Fab intake, Kooks headers, DSS driveshaft and axles, BMR suspension parts, VMax ported throttle body, Whipple blower. (623hp).
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10-16-2013, 01:18 AM | #6 |
No issues whatsoever!
Noweeds (FI) since 2011, currently @ 15# boost - all is well! Boost seems to drop a bit, but it's difficult to read the gauge when going flat-out with diverters open
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custom build forged LSA, 379ci, TVS2300@15psi, 696rwhp/688ft-lbs, built by DH Individual, Customkingz, tuned by Jannetty Racing
JRE rough idle cam, JRE ported lower intake manifold, OD cog drive, 6% OD crank pulley, ported ls3 heads, NW102mm TB, 1/2'' RDS spacer, IW 8-rib drive Pfadt Cradle Bushings, Arms & Rods, Pedders Supercar w/FE4 conversion, ZL1 sways, HE Twin Carbon Street Slayer, ZL1 Rear End (3.73) CTS-V Brake upgrade, Street: 22'' Vossen CV1, Strip: 18'' Forgestar F14 on MT Street Radials |
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10-16-2013, 04:30 PM | #7 |
Drives: 2010 Camaro (M6) 1000+ HP SBE Join Date: Jun 2011
Location: Houston
Posts: 1,391
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I appreciate the replies.
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F-1X, Cog Drive, ATI Super Pulley/Sprag ~ 19 psi
Blower Cam Brodix BP BR 3 Heads Kooks LT Headers and full 3" exhaust Fore Triple Pump Fuel System with ID 1700X Injectors - E85 conversion DSS 9” Conversion (1400 hp axles, driveshaft, pumpkin) & Strange 3.70 gears McLeod RXT Twin HD Clutch & Upgraded Slave RPM Level VII TR6060 BMR Drag Suspension Package w/Strange shocks Carlyle 15" and M/T ET Street R radials 10.1 @ 143 mph 1/4 mile |
10-16-2013, 04:43 PM | #8 |
Drives: 2011 camaro ss vortech supercharged Join Date: Aug 2011
Location: marion VA.
Posts: 524
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They sound great open, but at the track my car slows down over a second, it feels like it loses boost and runs like crap.
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10-16-2013, 05:19 PM | #9 |
Drives: 2011 Camaro 2SS/RS Join Date: Oct 2011
Location: Texas RGV
Posts: 794
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I have a centri and it seems less responsive and shifts tend to lag on part throttle. I just don't like the feel of them open. I haven't gone WOT with them open after the blower. Also I was told by my tuner that I dropped 8 HP on the dyno w them open
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10-16-2013, 05:20 PM | #10 |
Drives: 2011 Camaro 2SS/RS Join Date: Oct 2011
Location: Texas RGV
Posts: 794
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Oh I forgot to say I love cruising with them open they're awesome
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10-16-2013, 06:14 PM | #11 |
Drives: 2SS RS Join Date: Mar 2010
Location: MD
Posts: 1,272
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I should also mention my car is noticeably sluggier from a stop with them open. This may be a good thing if you don't have traction on street tires.
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Livernois 2C cam and tune, LS3 conversion, Roto-Fab intake, Kooks headers, DSS driveshaft and axles, BMR suspension parts, VMax ported throttle body, Whipple blower. (623hp).
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10-16-2013, 07:51 PM | #12 |
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10-16-2013, 09:22 PM | #13 |
Drives: 2SS RS Join Date: Mar 2010
Location: MD
Posts: 1,272
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The numbers may not change, I just notice the car is slower out of the hole with them open.
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Livernois 2C cam and tune, LS3 conversion, Roto-Fab intake, Kooks headers, DSS driveshaft and axles, BMR suspension parts, VMax ported throttle body, Whipple blower. (623hp).
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10-16-2013, 10:04 PM | #14 |
Drives: ABM SS/RS Join Date: Sep 2009
Location: WV
Posts: 587
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Whipple with DMH cutouts. No cats. Dyno #'s don't change much open or closed. +\- 3hp.
Have a friend with same setup running hi flow cats and he ran into heat issues when running with them open. Melted some shit. I haven't had that issue but not running cats either. |
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