thinkin about gettin a cutout...pros VS cons
09-13-2002 | 06:34 AM
#1
Thread Starter
Banned
Joined: Apr 2002
Posts: 211
From: at work
thinkin about gettin a cutout...pros VS cons
well i know the pro being better flowing xhaust, but what cons have u found?
some1 said somethin about losin low end torque, is this true and if so is it really that bad?
i have a '00 LS1 so if any1 with a similar car with a cutout please tell me what u think.
thanX
some1 said somethin about losin low end torque, is this true and if so is it really that bad?
i have a '00 LS1 so if any1 with a similar car with a cutout please tell me what u think.
thanX
09-13-2002 | 08:06 AM
#2
Registered User
Joined: Dec 1999
Posts: 825
From: Houston, TX
There are only 2 things I don't like about my cutout. The first is that it hangs pretty close to the ground after I got my long tubes. I scrape it going in and out of some peoples driveways. The other thing is also due to my long tube headers, it's just way too loud inside the car. The good thing is that you can cap it whenever you like, I only uncap mine at the track now.
As far as a loss of low end torque, it may feel that way, but I haven't seen any dyno sheets that prove there's a loss of low end torque. My theory is just that since the exhaust is so much louder, your more reluctant to step on the gas.
------------------
1997 Bright Red Z28
A4, 3.23's, K&N FIPK, FLP Headers, Flowmaster, Cutout
My Z28
[This message has been edited by EviLBoX (edited September 13, 2002).]
As far as a loss of low end torque, it may feel that way, but I haven't seen any dyno sheets that prove there's a loss of low end torque. My theory is just that since the exhaust is so much louder, your more reluctant to step on the gas.
------------------
1997 Bright Red Z28
A4, 3.23's, K&N FIPK, FLP Headers, Flowmaster, Cutout
My Z28
[This message has been edited by EviLBoX (edited September 13, 2002).]
09-13-2002 | 11:48 AM
#3
Registered User
Joined: Jun 2000
Posts: 806
From: MI
<font face="Verdana, Arial" size="2">Originally posted by EviLBoX:
As far as a loss of low end torque, it may feel that way, but I haven't seen any dyno sheets that prove there's a loss of low end torque. My theory is just that since the exhaust is so much louder, your more reluctant to step on the gas.
</font>
As far as a loss of low end torque, it may feel that way, but I haven't seen any dyno sheets that prove there's a loss of low end torque. My theory is just that since the exhaust is so much louder, your more reluctant to step on the gas.
</font>
With an exhaust cutout, you can cap it when you want the car quiet, or you can uncap it when you want it really loud.
09-13-2002 | 12:24 PM
#4
Registered User
Joined: Apr 2001
Posts: 674
From: Sac, CA
On all my cutout vs. no cutout dynos there is no loss of tq. I see about 10-12 rwhp gain at peak and about a 10 rwtq gain at peak.
What I do see and suspect that people are interpreting as a loss; is at below 3000 rpms is no or little gain in rwhp - no loss just no gain.
Similiar thing with tq, except there is gain. But agian, it's just not as great as it is at peak - only a couple of ft lbs.
So relative to the high end power, the low end will seem less. But there is no actual loss.
From an asthetic standpoint, everyone is different. I only open mine at the track. With LTs and sans cats, it's just too loud for a daily driver - besides I have a bit of social consencious where my nieghbors are concerned.
------------------
'01 Mystic Teal Z28
A4/3.73
Mods List Here
12.12/112.81/1.70 60'
325 rwhp/341 rwtq
www.MysticZ28.com
NorCal LS1/LT1
"To play it safe is not to play"
What I do see and suspect that people are interpreting as a loss; is at below 3000 rpms is no or little gain in rwhp - no loss just no gain.
Similiar thing with tq, except there is gain. But agian, it's just not as great as it is at peak - only a couple of ft lbs.
So relative to the high end power, the low end will seem less. But there is no actual loss.
From an asthetic standpoint, everyone is different. I only open mine at the track. With LTs and sans cats, it's just too loud for a daily driver - besides I have a bit of social consencious where my nieghbors are concerned.
------------------
'01 Mystic Teal Z28
A4/3.73
Mods List Here
12.12/112.81/1.70 60'
325 rwhp/341 rwtq
www.MysticZ28.com
NorCal LS1/LT1
"To play it safe is not to play"
09-13-2002 | 12:53 PM
#5
Registered User
Joined: Jul 2001
Posts: 1,655
From: Jacksonville, FL
I just installed the QTEC electric cut out. With the stock cats it's not too loud, I run it wide open most of the time. Haven't noticed any loss of power. Wish I had done it earlier. 
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A4 (3.42)/Whisper Lid/Corsa Catback/FTRA/BMR STB, ALCA's, APHR/QTEC Cut Out/160*Tstat/SLP Fan Switch/HPP3
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A4 (3.42)/Whisper Lid/Corsa Catback/FTRA/BMR STB, ALCA's, APHR/QTEC Cut Out/160*Tstat/SLP Fan Switch/HPP3
09-13-2002 | 01:55 PM
#6
Registered User
Joined: Aug 2000
Posts: 1,902
From: Houston, Tx USA
I was thinking of going with an electric cutout and mounting it up from before the cat for track use only.
That way fumes wont bother me and I will see the most benefit.
That what I am currently researching.
------------------
Psycho Cabbage
2002 Camaro Z28
(6 sp) Bone stock
Webmaster for RaceHer.com
Check out the current polls and vote!
by the prěcking of my thumb, something wicked this way comes
-Traded in- 1995 Camaro Z28 (A4 (#6 I might add!),ES tranny mount and torque arm bushing,SLP CAI,ASP 34% Underdrive,Strange 3.73's (shredded Auburn),1LE alum driveshaft & intake elbow,Yokohamas AVS Intermediates,160-stat,MAF screen removed, HPP+(for shift points only),Borla Y-pipe, Flowmaster Force-II catback, Gutted Cat, Airlift Airbag, !TB Bypass, J&M LCA's, Bosch Platinums, Moroso BlueMax Wires, Free RamAir, Meziere Electric H2O pump, MAC 3point STB, BMR Panhard, SCR SFC's
Just installed:Nu-tek Heads (mild port) and Comp Cams 1.6RR's! New track and dyno #'s to follow!
best 13.44 @103.26
0-60ft 1.96
270 RWHP/296 RWTQ
0-60MPH 4.8sec
1987 Porsche 944S (waiting on LT1 mod)
That way fumes wont bother me and I will see the most benefit.
That what I am currently researching.
------------------
Psycho Cabbage
2002 Camaro Z28
(6 sp) Bone stock
Webmaster for RaceHer.com
Check out the current polls and vote!
by the prěcking of my thumb, something wicked this way comes
-Traded in- 1995 Camaro Z28 (A4 (#6 I might add!),ES tranny mount and torque arm bushing,SLP CAI,ASP 34% Underdrive,Strange 3.73's (shredded Auburn),1LE alum driveshaft & intake elbow,Yokohamas AVS Intermediates,160-stat,MAF screen removed, HPP+(for shift points only),Borla Y-pipe, Flowmaster Force-II catback, Gutted Cat, Airlift Airbag, !TB Bypass, J&M LCA's, Bosch Platinums, Moroso BlueMax Wires, Free RamAir, Meziere Electric H2O pump, MAC 3point STB, BMR Panhard, SCR SFC's
Just installed:Nu-tek Heads (mild port) and Comp Cams 1.6RR's! New track and dyno #'s to follow!
best 13.44 @103.26
0-60ft 1.96
270 RWHP/296 RWTQ
0-60MPH 4.8sec
1987 Porsche 944S (waiting on LT1 mod)
09-13-2002 | 03:15 PM
#7
Registered User
Joined: Apr 2001
Posts: 674
From: Sac, CA
<font face="Verdana, Arial" size="2">Originally posted by psychocabbage:
I was thinking of going with an electric cutout and mounting it up from before the cat for track use only.
That way fumes wont bother me and I will see the most benefit.
That what I am currently researching.
</font>
I was thinking of going with an electric cutout and mounting it up from before the cat for track use only.
That way fumes wont bother me and I will see the most benefit.
That what I am currently researching.
</font>
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