Page 1 of 2 12 LastLast
Results 1 to 20 of 27

Longtube headers/

This is a discussion on Longtube headers/ within the External Engine forums, part of the LSx Technical Help Section category; Hey guys and girls. I'm bk again with more questions My car has the cats broken They are makin noyse ...

  1. #1
    Senior Member 98maro's Avatar
    Join Date
    Feb 2010
    Location
    north bay california
    Age
    28
    Posts
    2,973

    Black
    00 camaro ss M6 #6695

    Longtube headers/

    Hey guys and girls. I'm bk again with more questions
    My car has the cats broken
    They are makin noyse inside 1 of them
    So I'm just gonna take em off
    And I was thinking bout gettin some LT headers
    My questio is. If I get em do I have to tune the car?
    Or I can run the car wit LT headers no cats
    I knw it will have the gas smell all the time
    So at da same time I was thinking bout gettin high flow cats
    Any advice,?
    Thanks

  2. #2
    crazy ass white boy dennis ss's Avatar
    Join Date
    Mar 2010
    Location
    melbourne florida
    Age
    39
    Posts
    473

    navy blue metallic
    2002 camaro ss

    You would need to tune your car to get the maximum gains from the headers. Also if you remove the cats you will have to tune the rear O2 sensors out.
    2002 Camaro SS/M6. Volant CAI, 80mm TB w/spacer, cat delete w/ ory, borla XR-1 w/ cme, custom tune, 3.73's, 8,000k HID headlights and foglights, 19" staggered ruff 278 wheels.

  3. #3
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,576

    Black & Blue
    '02 WS.6 / '07 Suburban

    Anything that changes the airflow through your engine should then be compensated for via tuning. Headers definitely have an impact on airflow. Strongly recommend a mail order tune from Frost to get the most out of your mods.

  4. #4
    Senior Member 98maro's Avatar
    Join Date
    Feb 2010
    Location
    north bay california
    Age
    28
    Posts
    2,973

    Black
    00 camaro ss M6 #6695

    Thanks for the replies
    What could happen if I dnt get the tune for now ?

    Cuz I have more plans for it but not right now
    That's why I dnt want to do the tune right now
    I want to get
    Ls6 intake
    Ls6 ported and polish heads
    Polish and throttle body
    Lifters
    Roller rockers
    Pushrods
    LT headers
    Small cam
    High flow cats
    And all the free mods with
    Slp air lid

    Once I get all thR

  5. #5
    Senior Member 98maro's Avatar
    Join Date
    Feb 2010
    Location
    north bay california
    Age
    28
    Posts
    2,973

    Black
    00 camaro ss M6 #6695

    Once I get all that want to get the tune
    But I wanted to start with the headers

  6. #6
    crazy ass white boy dennis ss's Avatar
    Join Date
    Mar 2010
    Location
    melbourne florida
    Age
    39
    Posts
    473

    navy blue metallic
    2002 camaro ss

    Depending on how long it takes you to get all the mods listed you can go without a tune for a little while but the car will run like crap. I don't know your money flow but if it takes more than a month or so to get all those mods then I would make sure you get the tune, IMO

  7. #7
    Senior Member 98maro's Avatar
    Join Date
    Feb 2010
    Location
    north bay california
    Age
    28
    Posts
    2,973

    Black
    00 camaro ss M6 #6695

    It's gonna take a while
    To do all that probably will have everithin by next year
    I dnt wanna have the car runnin like dat for a long time
    So I should buy the parts and install en all together and get it tuned

  8. #8
    What Would Earl Do? Vexzer's Avatar
    Join Date
    Apr 2007
    Location
    Kirby, TX
    Posts
    230

    Fire
    2002 SS

    Quote Originally Posted by 98maro View Post
    What could happen if I dnt get the tune for now?
    By just changing to LT's you prolly won't be able to tell any difference in driveability, but you might not pass CA emissions if you lose the cats. If you lose the cats, you will need a "tune" for the sake of killing the secondary o2's. Otherwise you'll be stuck with a 'check engine' light.

  9. #9
    Senior Member Too Fast's Avatar
    Join Date
    Nov 2006
    Location
    Indianapolis
    Age
    54
    Posts
    5,170

    Black
    2000 WS6 6spd Hooker LT

    Quote Originally Posted by dennis ss View Post
    Depending on how long it takes you to get all the mods listed you can go without a tune for a little while but the car will run like crap. I don't know your money flow but if it takes more than a month or so to get all those mods then I would make sure you get the tune, IMO
    Wrongo. I didn't get my tune (from Frost) for 3.5 years after I put on my stuff, and I'm not sure I really needed it. I put on my Hooker ceramic LTs and ORY, lost my EGR, rear O2s and AIR pump, had no issues except the SES light was on. Unless you say that 1.5 MPG highway improvement and a higher trap speed at the 1/4 mile dragstrip is a problem. It does feel a bit more urgent when I get on it when the engine is over 3500 RPM or so since the tune, but my most recent trap speeds (107.x) don't back up the tune advice. 9 months after I put on the headers/ORY, on a very nice (mid 50 degree temps) October evening, I ran 7 times with trap speeds of 109.x, a best that night of 12.89 109.85. All that with 1.99-2.1 60 ft times.

    These MAF cars are self tuning to an extent, if the PCM senses higher airflow (which it will with the addition of LTs, since the engine's efficiency is better) it will alter the fuel map. But to always get the most gains, a mail order tune from someone like Frost is a given, for a stock car or a bolt-on car. For the best tune, you need to get to the dyno with someone who knows what they are doing, and monitor A/F ratios so as not to be too lean.

  10. #10
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,576

    Black & Blue
    '02 WS.6 / '07 Suburban

    Quote Originally Posted by Too Fast View Post
    Wrongo. I didn't get my tune (from Frost) for 3.5 years after I put on my stuff, and I'm not sure I really needed it. I put on my Hooker ceramic LTs and ORY, lost my EGR, rear O2s and AIR pump, had no issues except the SES light was on. Unless you say that 1.5 MPG highway improvement and a higher trap speed at the 1/4 mile dragstrip is a problem. It does feel a bit more urgent when I get on it when the engine is over 3500 RPM or so since the tune, but my most recent trap speeds (107.x) don't back up the tune advice. 9 months after I put on the headers/ORY, on a very nice (mid 50 degree temps) October evening, I ran 7 times with trap speeds of 109.x, a best that night of 12.89 109.85. All that with 1.99-2.1 60 ft times.

    These MAF cars are self tuning to an extent, if the PCM senses higher airflow (which it will with the addition of LTs, since the engine's efficiency is better) it will alter the fuel map. But to always get the most gains, a mail order tune from someone like Frost is a given, for a stock car or a bolt-on car. For the best tune, you need to get to the dyno with someone who knows what they are doing, and monitor A/F ratios so as not to be too lean.

    By chance, did you log and compare your pre and post tune A/F ratios or STFT's/LTFT's? I agree that the PCM will compensate based upon feedback from the O2 sensors. Just curious as to what the difference was.

  11. #11
    crazy ass white boy dennis ss's Avatar
    Join Date
    Mar 2010
    Location
    melbourne florida
    Age
    39
    Posts
    473

    navy blue metallic
    2002 camaro ss

    When I had my cats deleted and my ORY and exhaust installed my car ran like shit. It sucked twice as much gas and just generally ran crappy. Car ran super rich as well. After the tune on a laptop my car runs like a bat out of hell and no more black smoke. To each his own, I'm speaking from my personal experience. My SS is different car after a tune

  12. #12
    Senior Member 98maro's Avatar
    Join Date
    Feb 2010
    Location
    north bay california
    Age
    28
    Posts
    2,973

    Black
    00 camaro ss M6 #6695

    Ok if I got it right
    If I remove the cats had to be tuned?
    If I run LT with cats could run fine for a while ?
    Could I use high flows instead of stock cats?

  13. #13
    Senior Member Too Fast's Avatar
    Join Date
    Nov 2006
    Location
    Indianapolis
    Age
    54
    Posts
    5,170

    Black
    2000 WS6 6spd Hooker LT

    ^^^nope. I have looked at the trims now, they are +/- 3% of desired, so that's right where he wants it. I attribute my excellent MPH that night in October more to the perfect DA then, more then I think I lost something with the tune. If I could go back to that night with the current tune, I'm pretty sure it would've hit over 110.


    I should've looked at the fuel trims before I sent the PCM away, but didn't. PCM compensates based not only on O2 sensors, but other variables like MAF, ECT, as I'm sure you know. It would be nice to have a wide band O2.

    (was responding to pajeff02)

  14. #14
    Senior Member 98maro's Avatar
    Join Date
    Feb 2010
    Location
    north bay california
    Age
    28
    Posts
    2,973

    Black
    00 camaro ss M6 #6695

    Wat I want to do on mine
    LT headers y pipe. Cut out.
    And 1 high flow cat

  15. #15
    Senior Member Too Fast's Avatar
    Join Date
    Nov 2006
    Location
    Indianapolis
    Age
    54
    Posts
    5,170

    Black
    2000 WS6 6spd Hooker LT

    I don't think you can do that in the land of Cali, can you? Must have the cats in the OE location. I like the cut out tho.

  16. #16
    Senior Member 98maro's Avatar
    Join Date
    Feb 2010
    Location
    north bay california
    Age
    28
    Posts
    2,973

    Black
    00 camaro ss M6 #6695

    Here in Cali. LT and high flows are illegal
    I want to get the headers cuz it sounds sick
    And remove or change the cats because it will feel better more horses

    Thanks
    I like the cutouts
    I'm keeping the muffler

  17. #17
    Moderator 35th-ANV-SS's Avatar
    Join Date
    Oct 2008
    Location
    Wherever life takes me
    Posts
    12,465

    Red
    02 35th LE Camaro SS

    You cannot pass smog in Cali with LTs...period. Not legally at least. And I agree with too fast, a tune is not a necessity with LTs, but it is recommended.

    There are plenty of people running LTs without a tune, and for a long time. Will you get the most out of them without a tune? Of course not, but again I don't think it is a live or die situation.

  18. #18
    Senior Member 98maro's Avatar
    Join Date
    Feb 2010
    Location
    north bay california
    Age
    28
    Posts
    2,973

    Black
    00 camaro ss M6 #6695

    I knw it won't pass the smog with LT
    I'm ok with that. I'm gonna do the smog check next week then I have 2 years ahead of me for the emissions again
    I just want to make sure what could happen if I dnt get it tuned
    I will tune it when I'm done with the mods

  19. #19
    Member 00ls-1's Avatar
    Join Date
    Feb 2010
    Location
    Kilgore Texas
    Age
    32
    Posts
    378

    Silver
    2000 z28

    i know the computer comoensates i put an 85mm maf sensor and the car wanted to die when i did it but i took it out on the street and ran it for a second and then just floored it and when i stopped it ran fine....btw i noticed a difference in powere w the bigger maf sensor
    2000 z28 granatelli lid k&n air filter 85mm maf sensor lakewood adjustable traction bars nitto drag radialsgot 3.73s but not installed yet waaaay more to come

  20. #20
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,576

    Black & Blue
    '02 WS.6 / '07 Suburban

    Quote Originally Posted by 00ls-1 View Post
    i know the computer comoensates i put an 85mm maf sensor and the car wanted to die when i did it but i took it out on the street and ran it for a second and then just floored it and when i stopped it ran fine....btw i noticed a difference in powere w the bigger maf sensor

    In all seriousness... ditch the 85mm MAF unless you have it tuned. These simply lean out your engine and are not recommended. The stock MAF is good up to around 500 hp. Also, it should not be modifed -- leave the screen and blade in place and do not port it.

Page 1 of 2 12 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Longtube headers,,
    By 98maro in forum Parts Wanted / Trade
    Replies: 8
    Last Post: 04-13-2012, 07:41 PM
  2. Question: Longtube headers or short headers?
    By 98maro in forum General Help
    Replies: 16
    Last Post: 03-01-2010, 06:25 AM
  3. WTB Longtube Headers
    By 5abivt in forum Parts Wanted / Trade
    Replies: 0
    Last Post: 10-11-2009, 11:33 AM
  4. WTB: Longtube Headers
    By 98camaro in forum Parts Wanted / Trade
    Replies: 0
    Last Post: 08-14-2007, 05:30 PM
  5. Longtube Headers
    By morocotopo in forum External Engine
    Replies: 0
    Last Post: 10-20-2005, 10:41 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •