20 rwhp from cutout
04-30-2006, 11:02 PM
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20 rwhp from cutout When I dyno tuned my car we used a wide band, of course so I had the cutout closed. From the 1st to the 4th dyno pulls, I went from 376rwhp to 392. On the 5th pull, I only gained one more horsepower so we figured that was all she had in her. We took off the wide band and opened the cutout. I was hoping for 7 horses so I could hit that magical 400rwhp. To everyone's surprise, I went from 393rwhp and 374rwtq to 413rwhp and 394rwtq. 20 horses and 20 ft lbs!!! None of us had ever seen gains like that from a cutout. I eliminated the cutout and am now running a bullet.
Has anyone else seen these kinds of gains from a cutout?
Has anyone else seen these kinds of gains from a cutout?
05-01-2006, 01:31 AM
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Mods listed in my signature. I'm running the Hooker long tubes and ORY. All ceramic coated. With the cutout closed, the exhaust was running through a Flowmaster muffler and stock tips.
05-01-2006, 01:00 PM
#7
Originally Posted by 01bird58
^^ Ive heard all the bashing and negativity, and this truly warrents it to be known as the SLOWMASTER 
If any shop ever recommends Flow/Slowmaster for an F-Body, turn around and walk away. They sound good, but eat up power like a champ.
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05-01-2006, 07:45 PM
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Originally Posted by WS-Sick
So what do bullets flow? Have you dynoed with the bullet yet?
I understand that Flowmaster kinda sucks but I was still surprised to see the 20 horses.
I'll post up some dyno numbers with the Borla bullet but it won't be for another couple of months.
05-02-2006, 07:05 AM
#13
I have the Edelbrock catback and with a cutout I gain 24 hp. The last time i went through the muffler was back when it was at 420/405 cutout and 396/392 through the muffler.
Exhaust sounds to good to change though , I just need to quit being tight and get an Electric cutout opener.
Exhaust sounds to good to change though , I just need to quit being tight and get an Electric cutout opener.
05-02-2006, 07:52 AM
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i have flowmaster super 40's......how much am i loosing or how much can i gain if i go with a different muffler? what will give me the best flow and least loss of horse while still sounding good?
05-02-2006, 08:55 AM
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^^ search / look in the external engine section. There is an endless amount of info on that topic. Word on the boards is GMMG is the best Y set up possible and some even pick it over true duals.
05-02-2006, 11:04 AM
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i'm also running a flowmaster, and i went from 387rwhp to 416 rwhp by opening the cut-outs.i also picked up 30 rwtq. the car also drives smoother with the cut-outs open. i was about to switch to a dual set-up but i got a deal on some Z06 rims i had to jump on 
05-02-2006, 05:21 PM
#19
OK Let me jump in here too. I dynoed 310 hp and 340 tq with a Flowmaster muffler on my car. Same dyno diff day, only diff. being a 3 inch Y-Pipe and 3 inch cutout and I dynoed 332 hp & 340 Tq. That's a 22 hp diff and same Tq with a cutout and 3 inch Y-Pipe........CHOKEMASTER IT IS 