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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 04-01-2009, 03:16 PM   #1
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does a cut out add hp ?

other than sounding great does a cutout offer any hp gains over stock ?

thanks
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Old 04-01-2009, 03:17 PM   #2
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Absolutely!
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Old 04-01-2009, 03:22 PM   #3
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Short answer?

Probably.
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Old 04-01-2009, 03:25 PM   #4
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If tuned for then yes. Cut outs are pre cats and really can effect backpressure. You can tune timing and AFR for things like this and it will help the end result a lot more then just slapping one on there.
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Old 04-01-2009, 03:37 PM   #5
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You wouldn't tune if you had an electrical cutout, right?
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Old 04-01-2009, 03:40 PM   #6
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No you would. Electrical cutouts are controlled by throttle position and tuning can be measured the same way too. As RPMs increase and the cutout opens you would play with the scales. But if it was a fulltime cutout it would be a slightly different map then a gradual cutout
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Old 04-01-2009, 03:42 PM   #7
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I was thinking more along the lines of a manually controlled cutout kind of like this...

http://www.quicktimeperformance.com/QTEC/index.php
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Old 04-01-2009, 03:48 PM   #8
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I'm curious too. I like the idea of being able to open up the cut-outs from inside the car if some moron is blaring his music next to me thinking he's cool.

Also, if you do cut-outs, where do you put them in relation to everything else in the exhaust system, and where do you run pipe, if any, from the cut out.
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Old 04-01-2009, 04:41 PM   #9
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I'm curious too. I like the idea of being able to open up the cut-outs from inside the car if some moron is blaring his music next to me thinking he's cool.

Also, if you do cut-outs, where do you put them in relation to everything else in the exhaust system, and where do you run pipe, if any, from the cut out.
This has all been discussed before!!! do a search with in the forum.
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Old 04-01-2009, 05:08 PM   #10
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I'm curious too. I like the idea of being able to open up the cut-outs from inside the car if some moron is blaring his music next to me thinking he's cool.

Also, if you do cut-outs, where do you put them in relation to everything else in the exhaust system, and where do you run pipe, if any, from the cut out.
Most cut-outs are electric / on-demand. Go to yotube and search "cut out corvette". Piles of vids.
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Old 04-01-2009, 05:17 PM   #11
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You lose lowend TQ but gain it back with highend TQ with it open.A long time ago in my 2000 camaro (ls1) I gained 9rwhp with a crappyFlowbasher.
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Old 04-01-2009, 06:44 PM   #12
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add hp, no. free up hp yes, properly tuned.
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Old 04-01-2009, 07:00 PM   #13
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this video has videos
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Old 04-01-2009, 07:12 PM   #14
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add hp, no. free up hp yes, properly tuned.
I shouded of said free-up, your right.. Now my car has a GMMG cat-bac and it only gets 3 add RWHP on dyno(cutout open) becase the gmmg is very free flow. Ordering 2 cut-outs for my 2010 camaro next week.
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Old 04-01-2009, 07:42 PM   #15
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this would be the first thing i would do to my car
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Old 04-01-2009, 07:58 PM   #16
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If tuned for then yes. Cut outs are pre cats and really can effect backpressure. You can tune timing and AFR for things like this and it will help the end result a lot more then just slapping one on there.
Oh no, not the backpressure debate!

And you would have to put the cutout(s) aftercat or you will screw up the O2 sensors, not the mention the cats are probably so close to the exhaust manifolds that there would be no way to even fit a cutout in there.

EDIT: My electric cutout was great until the motor burned out. Because there was no sensor to stop the flow of current when the butterfly was completely shut the motor would eventually burn out from holding the switch a little too long each time it was being closed. Plus it never sealed quite right. This was awhile ago and maybe there are some better designs out there now.
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Old 04-01-2009, 08:08 PM   #17
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add hp, no. free up hp yes, properly tuned.
Adding HP is the same as freeing up HP.

Would you say that headers don't add HP, or a more "free-flowing" cylinder head doesn't add HP?

The only difference I might concede to is the use of nitrous where the additional power is not gained by an increase in airflow/Volumetric Efficiency, but by changing the chemical composition of the combustion charge.

And tuning is not necessary for a cutout. It is basically an exhaust with very little restriction behind the cats, where your muffler would normally be. But tuning would help, the same way it would help with any engine modification.

Also, you don't "lose" low end torque, rather the torque curve moves higher up in the power band because of the wave tuning effects caused by a shorter exhaust pipe length.

I would recommend to everyone in this forum to spend a couple of days over at LS1Tech.com and browse the "Advanced Performance" forum to get a basis of how engines and modifications to them truly work.
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Old 04-01-2009, 09:33 PM   #18
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wow I just saw my post I was in a hurry.


what I meant to say was






this site has videos on their product http://www.dmhperformance.com/ecutout.htm
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Old 04-02-2009, 03:43 PM   #19
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Quote:
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No you would. Electrical cutouts are controlled by throttle position and tuning can be measured the same way too. As RPMs increase and the cutout opens you would play with the scales. But if it was a fulltime cutout it would be a slightly different map then a gradual cutout
SOME electric cutouts are controlled by TP%. others are just a buterfly valve with a motor hooked to a switch inside the car. or some are completely manual ones that dont have a motor at all and require the removal of the plate to open them.

can they add power? yes.
do they always add? no.


you can tune for a cutout, but unless your regular exhaust is extremely restrictive, you wont need to tune for a cutout.

as for placing them... you can put them wherever you want in the exhaust stream. pre-cat, post-cat, in place of the muffler. whatever. you dont HAVE to put them in a certain location. ideally, you want them in front of any restriction of the exhaust ie: mufflers, cats, etc. so that they can offer the least restrictive route for the exhaust gasses to flow. however that is rarely a possibility with cats being mounted right off the manifolds.

DMH, QTP, and other places are great for electric cutouts.
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Old 04-02-2009, 08:33 PM   #20
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I think this would be the best place to add them, it would be louder after removing those resonators then be REALLY loud with the cutouts open. If there is not enough room, in front of the mufflers near the diff would be the other option unless you go all custom.
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