post header install question
Thread Starter
Teching In
Joined: Apr 2005
Posts: 32
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From: WI
post header install question i just installed pacesetter headers, and y pipe, no exhaust yet, its in the mail somewhere. but i went out for the first ride, got on it from a stop, and it barely burns out, before i couldnt give more than 1/4 throttle in first or it would roast the tires after that. Could i have lost that much torque down low? or could there be somethign wrong?, it seems ot pull smooth up top, but not sure if its faster....thanks
Thread Starter
Teching In
Joined: Apr 2005
Posts: 32
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From: WI
Originally Posted by Red99TA
I'm with Lithium. Did you install rear O2 simms? Is it setting off any codes? If so go to autozone and they'll read the codes for free then let us know.
no rear o2's won't cause any performance loss. I suggest you unplug the battery for about 10 mins to do a PCM reset. Take it for a long drive, like 30 min. After she's warmed up, go WOT a few times. Give the PCM a chance to adjust to your mods.
Also, check and then double check your plugs and wires.
Also, check and then double check your plugs and wires.
Launching!
Joined: Feb 2005
Posts: 238
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Its because you are running it open headers and there is no backpressure.
Today I installed the block off plate in my borla catback forcing all the exhaust through the muffler and noticed a SIGNIFICANT gain in part throttle acceleration and response. I think the cut out just flowed TOO well and at low rpms and small throttle %s, it just didn't have enough back pressure.
Get your exhaust on, tune it and see how it feels. I think thats your problem though.
Today I installed the block off plate in my borla catback forcing all the exhaust through the muffler and noticed a SIGNIFICANT gain in part throttle acceleration and response. I think the cut out just flowed TOO well and at low rpms and small throttle %s, it just didn't have enough back pressure.
Get your exhaust on, tune it and see how it feels. I think thats your problem though.
Gonna have to disagree with the no backpressure arguement. My car ran like a raped ape w/ open headers. W/ my cutout open there's no loss as compared w/ through my magnaflow (which flows really well to begin with). Anyways, open headers vs. full exhaust will not make more than maybe a 15 horse difference on a stock internal car. The way your making it sound as far as burning out is that you're off like 25+ horses down low which is NOT due to open headers...something else isn't right.
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Launching!
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Gonna have to disagree with the no backpressure arguement. My car ran like a raped ape w/ open headers.
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Thread Starter
Teching In
Joined: Apr 2005
Posts: 32
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From: WI
well i havent gotten her scanned yet, but i did a run on my gtech pro, i know there not the most accurate things but before headers, i ran a 13.7 with a friend in the car, now today i run it and i pull a 13.09 with 2.2 60ft at 111mph..so i think it must be making more power, but a 3.73s would probably help me im thinking.
maybe the computer is learning cause i unplugged the battery.. so i was tired when i initially took it out, but it does feel stronger now, specially if that gtech pro is anywhere near acurate.
maybe the computer is learning cause i unplugged the battery.. so i was tired when i initially took it out, but it does feel stronger now, specially if that gtech pro is anywhere near acurate.
11 Second Club
Joined: Feb 2003
Posts: 5,524
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From: The South
The G-techs are relatively accurate on ET's if you take care to give it the best test conditions possible. They are also relatively consistent. All told they are a better guestimate tool than I would have thought.
Joined: Jun 2004
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From: Ft. Irwin, California (But Virginia is home)
Originally Posted by Vortec5300
Its because you are running it open headers and there is no backpressure.
Today I installed the block off plate in my borla catback forcing all the exhaust through the muffler and noticed a SIGNIFICANT gain in part throttle acceleration and response. I think the cut out just flowed TOO well and at low rpms and small throttle %s, it just didn't have enough back pressure.
Get your exhaust on, tune it and see how it feels. I think thats your problem though.
Today I installed the block off plate in my borla catback forcing all the exhaust through the muffler and noticed a SIGNIFICANT gain in part throttle acceleration and response. I think the cut out just flowed TOO well and at low rpms and small throttle %s, it just didn't have enough back pressure.
Get your exhaust on, tune it and see how it feels. I think thats your problem though.
I fully agree.Schantin
2002 Camaro Z28 M6
11 Second Club
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From: The South
Originally Posted by Vortec5300
Its because you are running it open headers and there is no backpressure.
Today I installed the block off plate in my borla catback forcing all the exhaust through the muffler and noticed a SIGNIFICANT gain in part throttle acceleration and response. I think the cut out just flowed TOO well and at low rpms and small throttle %s, it just didn't have enough back pressure.
Get your exhaust on, tune it and see how it feels. I think thats your problem though.
Today I installed the block off plate in my borla catback forcing all the exhaust through the muffler and noticed a SIGNIFICANT gain in part throttle acceleration and response. I think the cut out just flowed TOO well and at low rpms and small throttle %s, it just didn't have enough back pressure.
Get your exhaust on, tune it and see how it feels. I think thats your problem though.
You are confusing backpresssure with exhaust gas velocity. In an all out, full throttle situation the least restrictive exhaust is usually faster, BTW.