Whats the deal with exhaust cutouts?

[BowtieGuy]

Originally Posted by The_Beast_

I'm Pretty sure I'll out mine just at the begining of the axle back, right befor the mufflers

That's cool, I just wanted to point out that you would get the most power at the end of the downpipe. Since they're only open during hard driving (i.e. racing) they're not too bad a nuisance during normal cruising.

[boxmonkeyracing]

all I know is I dropped the ORY and catback off and gained. . .so I think they'd help.

[The_Beast_]

Originally Posted by BowtieGuy

That's cool, I just wanted to point out that you would get the most power at the end of the downpipe. Since they're only open during hard driving (i.e. racing) they're not too bad a nuisance during normal cruising.

I just dont care much for the high end aspect of the cut outs. Just want something to scare away all the little Imports and Beemers at the red lights. . But maybe later I'll add another pair for high end thats linked to the RPM levels. But for the ones out back Im thinkin a simple switch.

[SoFlaZ]

Cutouts will indeed be one of my first mods. I'm not really looking to gain power really because 415 will be plenty for me(I say this now but I will probably want more in the future). I'm sure it will give a few hp and tq but I want that occasional roaring to scare people away. I know I'm real nice.

Oh and another cool cutout vid.

[Mr Twisty]

That used to be called "dumps". Hotrodders have been doing it for years. I got a ticket for non factory exhaust on my 69. You guys that have annual inspections may want to make sure it'll pass with them. AND eventually they're going to start leaking. (They're a PITA)

[boxmonkeyracing]

Originally Posted by MisterCamaro69

That used to be called "dumps". Hotrodders have been doing it for years. I got a ticket for non factory exhaust on my 69. You guys that have annual inspections may want to make sure it'll pass with them. AND eventually they're going to start leaking. (They're a PITA)

what's an inspection? I'm from TN we don't have anything called inspections. . .lol. thank god I'm not from NC or an NC state resident. . .

[Jamestwilliams]

Originally Posted by radz282003

There was a GMHTP buildup on an LS1 WS6 (that was eventually bored and stroked to 383 ci) wherein they swapped the OEM manifolds, SLP Y-pipe, and B&B catback with Dynatech LTs, QTP QTEC, and Borla CB. After tuning, they ran N20 runs with the cutout opened and closed and only gained ~ 8 RWHP, but something like ~ 30 RWTQ! That was around 430 RWHP though, so those gains will likely be higher than on a stock SS with manifolds.

Okay to explain something here, the reason there is an increase of only 8 rwhp while adding 30 lb/ft rwtq is in how the drive train works. What the gear reductions of the transmission and rear end accomplish is an increase in torque at the rear wheels. To move a car from a dead stop requires thousands of lb/ft of torque (for example based on the tranny and final drive of the ss you should get about 4000lb/ft of rear wheel torque. Some custom rockcrawler 4X4s are so low geared they get up to 30000lb/ft of rear wheel torque). So the larger torque number is due to the effect of gearing making a small difference a bigger difference at the rear wheels making an additional 30lb/ft of tourque inconsequential. That's why horse power was developed in the first place it accurately measures a comparable number as the gear ratios can increase or decrease torque. Even in sixth gear the new camaro will put out about 800lb/ft torque at the rears. So the moral of the story is don't fall for companies bragging about an increase in rear wheel torque that's why we use horse power.

[The_Beast_]

^ random much?

[headpunter]

ill take your word for it. bottom line they just sound bad ass

[The_Beast_]

^ damn straight

[Xanthos]

I've never been a fan of cutouts... If I want that open throat sound, I'll go with glass packs... Not exactly the same, but I think they sound better.
- Xanthos

[The_Beast_]

Glass packs are much more complicated. I say the cutouts with a simple switch is simple and sounds awesome.

[Mr Twisty]

Originally Posted by The_Beast_

Glass packs are much more complicated. I say the cutouts with a simple switch is simple and sounds awesome.

I tink u got dat bassackwards

[BowtieGuy]

Originally Posted by Jamestwilliams

Okay to explain something here, the reason there is an increase of only 8 rwhp while adding 30 lb/ft rwtq is in how the drive train works. What the gear reductions of the transmission and rear end accomplish is an increase in torque at the rear wheels. To move a car from a dead stop requires thousands of lb/ft of torque (for example based on the tranny and final drive of the ss you should get about 4000lb/ft of rear wheel torque. Some custom rockcrawler 4X4s are so low geared they get up to 30000lb/ft of rear wheel torque). So the larger torque number is due to the effect of gearing making a small difference a bigger difference at the rear wheels making an additional 30lb/ft of tourque inconsequential. That's why horse power was developed in the first place it accurately measures a comparable number as the gear ratios can increase or decrease torque. Even in sixth gear the new camaro will put out about 800lb/ft torque at the rears. So the moral of the story is don't fall for companies bragging about an increase in rear wheel torque that's why we use horse power.

This makes no sense.