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feels laggy after header install

Old 03-30-2011, 08:54 AM
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Default feels laggy after header install

my ws6 feels laggy since i put on pacesetter lts with a tsp y-pipe. is it because of the 2 o2 sensors that are no longer connected? or is it because it needs to be tuned? its connected to an slp lm and sounds great with open throttle.
Old 03-30-2011, 09:09 AM
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did you mess with your throttle cable at all while working up top?
Old 03-30-2011, 09:12 AM
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i didnt install it but idk why that would need to be messed with.
Old 03-30-2011, 09:21 AM
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If the back O2 sensors are not connected you either need O2 sims plugged in them or a tuner to tune them out
Old 03-30-2011, 09:27 AM
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Originally Posted by shepss217
did you mess with your throttle cable at all while working up top?
He is stating that the throttle cable could of accidently been hit or nudged and the tb blade is no longer opening all the way up when u go wide open throttle.

Have someone go in the car and press the the accelerator wide open and u look under the hood and verify it is hitting the bump stop.

Originally Posted by MillerTime85
If the back O2 sensors are not connected you either need O2 sims plugged in them or a tuner to tune them out
This will have no effect on performance it will just set a check engine light.


Make sure all spark plugs are not cracked/broken. Also make sure all wires are secure on the plugs and coils.
Old 03-30-2011, 11:00 AM
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Mine felt laggy also after I put header on until I installed a converter and did some tuning. Not sure if yours is an automatic, but if so, once you put a converter in it will really wake up.
Old 03-30-2011, 12:03 PM
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I lost power on mine after my header install on the bottom end gained up top but I havent been tuned yet it is running rich I am pretty sure thats y
Old 03-30-2011, 03:20 PM
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Originally Posted by luxexpress1
Mine felt laggy also after I put header on until I installed a converter and did some tuning. Not sure if yours is an automatic, but if so, once you put a converter in it will really wake up.
mines an m6

Originally Posted by CrazyDrivinJoe
I lost power on mine after my header install on the bottom end gained up top but I havent been tuned yet it is running rich I am pretty sure thats y
yeah the bottom end is where i'm noticing the loss of power. i feel like im probably running rich too.
Old 03-30-2011, 03:21 PM
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Originally Posted by 1998flamedCamaro
He is stating that the throttle cable could of accidently been hit or nudged and the tb blade is no longer opening all the way up when u go wide open throttle.

Have someone go in the car and press the the accelerator wide open and u look under the hood and verify it is hitting the bump stop.



This will have no effect on performance it will just set a check engine light.


Make sure all spark plugs are not cracked/broken. Also make sure all wires are secure on the plugs and coils.
the mechanic said i needed new plugs soon. it was fine driving to the mechanics though, i even put an RX-8 in its place.
Old 03-30-2011, 03:30 PM
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You lost some low end grunt and gained mid/top end power. Do a 2nd or 3rd gear pull to redline. It should pull harder up top. I assume a stall would help get you in the powerband, but I'm no a4 expert.
Old 03-30-2011, 03:31 PM
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Sorry, you're m6. I would unplug the battery and drie around easy for 100miles. Let the PCM learn the new mods. A tune would help, but not worth it, IMO.
Old 03-30-2011, 03:32 PM
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Originally Posted by TImmy_Jones
You lost some low end grunt and gained mid/top end power. Do a 2nd or 3rd gear pull to redline. It should pull harder up top. I assume a stall would help get you in the powerband, but I'm no a4 expert.
its an m6
Old 03-30-2011, 03:46 PM
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You shouldn't be losing any power, maybe just not gaining any on the low end.
I'd check plugs, and plug wires, then for any codes., and finally take it to a tuner.
Old 03-30-2011, 03:48 PM
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needs a tune
Old 03-30-2011, 05:55 PM
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Originally Posted by TheSilverOne
needs a tune
will probably do that after intake.
Old 03-30-2011, 08:33 PM
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i would have someone sit in your car and give it full throttle with it turned off, check to see if the blade is opening all the way and hitting the tab on the outside of the throttle body, when i put on my longtubes i tried disconnecting the throttle cable by removing the tab and it knocked it out of adjustment therefore not getting full throttle, after i adjusted it back it revved alot faster
Old 03-30-2011, 08:45 PM
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Originally Posted by GTAWS6Brah
the mechanic said i needed new plugs soon. it was fine driving to the mechanics though, i even put an RX-8 in its place.
You could put a RX-8 in its place if you were misfiring on three cylinders. They're dogs.
Old 03-31-2011, 02:21 AM
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Originally Posted by TImmy_Jones
Sorry, you're m6. I would unplug the battery and drie around easy for 100miles. Let the PCM learn the new mods. A tune would help, but not worth it, IMO.
You sir are incorrect.
Old 03-31-2011, 02:47 AM
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You lost low end torque, that's what happens when u do exhaust.

U also need sims on the rear O2's

A tune would also help a bit
Old 03-31-2011, 03:53 AM
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Funny, I never had any lost power issues on the low end of my car until I put a cam in it, but didn't really lose any power, the power just started later in the rpm range. If anything I think it would be a waste to tune it for just headers unless that is all your going to do. Most Header cars only put down around 330whp to around 350whp.

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