were to put cut out?

[KBeezy]

<blockquote>quote:</font><hr>Originally posted by Bliggida:


Another misconception of backpressure. You do not lose low end torque...you only gain more top end horsepower.<hr></blockquote>

Actually it is true on MOST vehicles, especially smaller displacement motors, but its not as nearly as bad as people think---and the gains up top are far more valuable than the low end power.

[GPFish]

Someone on our boards did a test with a L36 and cutouts. In the end, he was able to gain .1 in the quarter. Thats no too bad. Id opt for a manual cutout since they are alot cheaper than electric and you can justify a tenth for 50-80 bucks.

[KBeezy]

<blockquote>quote:</font><hr>Originally posted by GPFish:
Someone on our boards did a test with a L36 and cutouts. In the end, he was able to gain .1 in the quarter. Thats no too bad. Id opt for a manual cutout since they are alot cheaper than electric and you can justify a tenth for 50-80 bucks.<hr></blockquote>

I'd rather sit in my car for an extra 30-40 bucks and be able to open and close it on the streets :D

[GPFish]

<blockquote>quote:</font><hr>Originally posted by KBeezy:


I'd rather sit in my car for an extra 30-40 bucks and be able to open and close it on the streets :D <hr></blockquote>


Thats true too. There are ups and downs to manuals and electric. Id love to open it up at a light and give it a rev. I have also read about the motors to open the cutouts dying after a few months of use.

[Riley]

Back to the back pressure discussion part of this thread:
Actually what your doing, is moving the power band from the low end part of your RPM to your high end. So if you wanted to, you could say that you DO lose low end power but gain more at the top. That is why most people get their cutouts up front in place of the cat, and then put 4.10 gears or torque converters. That way they have both low AND high end power. They can feel the car pull consistently through most their gears.

[KBeezy]

<blockquote>quote:</font><hr>Originally posted by Riley:
Back to the back pressure discussion part of this thread:
Actually what your doing, is moving the power band from the low end part of your RPM to your high end. So if you wanted to, you could say that you DO lose low end power but gain more at the top. That is why most people get their cutouts up front in place of the cat, and then put 4.10 gears or torque converters. That way they have both low AND high end power. They can feel the car pull consistently through most their gears.<hr></blockquote>


Exactly! [img]smile.gif[/img] All it does is change the power curve.

[img]graemlins/thumbsup.gif[/img] [img]graemlins/thumbsup.gif[/img]

[Messi4h]

very well said...and electric cutouts are WAY TO MUCH FUN! I love my QTEC :D and the motors last, and if there is a problem they can always be sent in for repairs

[Ted]

<blockquote>quote:</font><hr>As far as sound goes, nothing sounds more awesome than open headers. But a great many people confuse too loud with sounding bad. Open Headers are indeed too loud (and I love it), but what they don't do is sound 'bad'. If its too loud for you, say so. No one is going to call you a "sissy" and actually mean it. Open headers creates a volume that can damage your hearing. You're smart to say its too loud. But don't misinterpret a bearable volume with "oh they sound horrible" The two are not synonamous. You need to learn to distinguish between the two before arriving at an opinion. <hr></blockquote>

I slightly agree with you. This is what I think. Yes it is very loud. As for it sounding bad. It sounds great at idle and if your cruising. But where it sounds bad is when it's under a lot of load. It sounds like some kinda mack truck or something. It is one of the horriblest sounds I have ever heard. I think this is the sound people relate to when they say it sounds bad. I could probably find some old clips if anyone wants to hear what i am talking about. If not who cares???

[toast]

IMO, open stock headers on the 3800 sounds terrable and there is no gain in power at all unless you are running some sort of boost(forced induction). No if the cutout is placed after the cat then a power gain can be felt. When i had my camaro i ran a 15.3 with just a Ravin muffler and Accel air filter, after i removed the cutout that was placed after the cat i ran a 15.1. I did gain power and it sounded desent. I eveually got tired of the crappy sound and did a whole flowmaster system with a highflow cat which yieled a 14.8 in my time and it sounded 10x better than the cutout after the stock cat.

[ReodDai]

I'm doing pacesetter jethot headers, 3" highflow magnaflow cat, 3" cutout, 3"in 2.5"out flowmaster 40series and two 3"in slashed pipes.

Oh and btw.. 3800 don't have stock headers they have tubular manifolds which are the suck.

[ November 21, 2003: Message edited by: ReodDai ]</p>

[Tellez]

Last night I ran the car at the track, the first run was with full exhaust,headers, no cat, a Z28 muffler and the second pass was with the cutout open right after the y-pipe. The cutout really does help, my 60ft went down with it open, I think there is no low end torque lost. The car is not really fast because of 3.08s I have but this were the results. The first run I had broken my personal best then my second run is my record.

Full Exhuast
Reaction 1.02
60ft 2.390
330ft 6.683
1/8 10.220
MPH 1/8 70.084
E.T. 15.805
MPH 87.756

cutout open
reaction .635
60ft 2.333
330ft 6.571
1/8 10.056
MPH 1/8 n/a
E.T. 15.573
MPH

[ November 22, 2003: Message edited by: Tellez ]</p>

[ReodDai]

if its a stock z28 muffler that isn't full exhaust..

[KBeezy]

<blockquote>quote:</font><hr>Originally posted by ReodDai:
if its a stock z28 muffler that isn't full exhaust..<hr></blockquote>

<blockquote>quote:</font><hr> headers, no cat, a Z28 muffler <hr></blockquote>


Close enough [img]tongue.gif[/img] Although larger pipes would have helped! [img]smile.gif[/img]

[ReodDai]

No.. far from it.. you put a v8's stock restrictive exhaust on your car. It would be like me saying full exhaust except for a stock cat..
Thats more like backwards exhaust in my opinion. You opened up the beginning of the exhaust flow only to make it equally restricted in the back.
Also about the larger pipe comment that isn't always true. A 2.5" exhaust with a very well designed muffler and a 3" exhaust with a restrictive muffler would differ in performance incredibly. Ei: Buying a real exhaust and buying something you found at autozone for $30.

[ November 22, 2003: Message edited by: ReodDai ]</p>

[Ted]

I have a 3800 and I don't have tubular manifolds? Is there something wrong with my car?