Will a cut out hender a LT1?
Thread Starter
Registered User
Joined: Mar 2005
Posts: 60
From: Noble, OK
Will a cut out hender a LT1?
Basicly will putting on a cut out hender the preformance of the LT1 due to the lack of back pressure? Right now my car is stock, except for the flowmaster 80 series muffler and K&N air filter.
Registered User
Joined: Feb 2005
Posts: 346
From: ohio
Re: Will a cut out hender a LT1?
what is up with all these people saying that about LT1's, I had a mustang guy try and tell me that my 3" Y pipe and 3" cut out setup will be horrible because of the loss of backpressure and I just laughed. yet the same exact set up on my buddies car netted a gain of .6 tenths and 4 mph. With LT headers of course.
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Joined: Mar 2005
Posts: 12,312
From: Aurora, IL
Re: Will a cut out hender a LT1?
A cutout will definitely help, I can feel a bit of a difference when I run with it open. A guy in the general tech forum just posted his new h/c dyno results and he showed an improvement of almost 15rwhp by opening his exhaust cutout and bypassing his flowmaster.
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Joined: Mar 2005
Posts: 12,312
From: Aurora, IL
Re: Will a cut out hender a LT1?
Here is the link:
http://http://web.camaross.com/forum...d.php?t=384077
Sorry, it wasn't a h/c motor, it is a cam-only with some impressive numbers.
http://http://web.camaross.com/forum...d.php?t=384077
Sorry, it wasn't a h/c motor, it is a cam-only with some impressive numbers.
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Joined: Jan 2005
Posts: 491
From: Lincoln, AL
Re: Will a cut out hender a LT1?
I had a mustang guy try and tell me that my 3" Y pipe and 3" cut out setup will be horrible because of the loss of backpressure
Last edited by matt65; Jul 21, 2005 at 08:53 AM.
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Joined: Jun 2005
Posts: 179
Re: Will a cut out hender a LT1?
the main reason that you feel such a difference is the cut out hurts your performance when its capped, think of the massive turbulence, the gain is very minimal unless you have somehting such as a slowmaster hindering your exhaust, a cut out is mearly a mind thing, louder = faster.
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Joined: May 2004
Posts: 467
Re: Will a cut out hender a LT1?
Obviously if you have a full borla exhaust on there you're not gonna notice a difference.
But if your cutting out stock exhaust and putting on LTs you'll notice a huge gain.
Stock exhaust is very restrictive.
- Z28WannaB
But if your cutting out stock exhaust and putting on LTs you'll notice a huge gain.
Stock exhaust is very restrictive.
- Z28WannaB
Originally Posted by Usmuscl398
the main reason that you feel such a difference is the cut out hurts your performance when its capped, think of the massive turbulence, the gain is very minimal unless you have somehting such as a slowmaster hindering your exhaust, a cut out is mearly a mind thing, louder = faster.
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Joined: Jul 2001
Posts: 4,577
From: DeKalb, IL
Re: Will a cut out hender a LT1?
A cutout may help or hurt. It all depends on your valvetrain and exhaust setup. My cammed car lost about 10 RWTQ and some 5 RWHP with the cutout open over a magnaflow catback.
The easiest way to tell is to put the car on the dyno and do a run with the cutout closed and open.
The easiest way to tell is to put the car on the dyno and do a run with the cutout closed and open.
Thread Starter
Registered User
Joined: Mar 2005
Posts: 60
From: Noble, OK
Re: Will a cut out hender a LT1?
Originally Posted by madwolf
The easiest way to tell is to put the car on the dyno and do a run with the cutout closed and open.
I wish I could, but finding a dyno shop or place I can pay to run it here in oklahoma (I live in Noble, just south of Norman/Oklahoma City) is hair pulling. I've yet to be able to find one.
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Joined: Jul 2001
Posts: 4,577
From: DeKalb, IL
