JS12
07-28-2003, 02:15 PM
what will give you the best gains in exahust at the track. i run extensions at the end of the headers, i also do this to save weight. :drive:
Drag Racing Tech - exhaust at the track. open headers?
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Navy David SS
07-28-2003, 07:49 PM
I've tried open headers (O2's got really screwy) and now my custom true duals (no X or H pipe)(8" x 3" pipe to 3" Dynomax billet mufflet to a short 3" turn-down). Open headers possibly a little better, but the true duals make the O2's happy :D
I did ask one of our sponsors how much I would loose by using true duals over X or H pipes. He stated not much poss 3-5 hp. Could never get the X pipe to work with the DS loop.
David
I did ask one of our sponsors how much I would loose by using true duals over X or H pipes. He stated not much poss 3-5 hp. Could never get the X pipe to work with the DS loop.
David
Colonel
07-29-2003, 02:54 PM
He stated that he runs extensions off of the headers. That will fix the O2 problems. Open headers can give you gains at the track...especially if you only operate the engine at higher RPMS (open headers can kill some low end power but that means nothing to those who's engines never see those low RPMS at the track.)
2000SILVERTA
07-29-2003, 06:55 PM
How long of an extension is "optimal?"
2000SILVERTA
07-30-2003, 08:18 PM
???what would be a good starting length to try on my longtubes?
JS12
07-31-2003, 12:29 PM
i hear 16-18in or so.
Kent1
07-31-2003, 01:04 PM
12 to 18 inches from talking with others, brother
ss_girl
07-31-2003, 05:25 PM
Does open headers change the car's tune after dumping the catback or dual setup?
SNAXS
07-31-2003, 05:58 PM
My friend ran open headers at the track and he lost alot of power. KR etc. was the effect
Colonel
07-31-2003, 08:08 PM
Did your friend use extensions? Did he determine for sure that his KR was real and not false knock?
Don't blame the fact that he was running open headers. There's something else afoot.
Don't blame the fact that he was running open headers. There's something else afoot.
SNAXS
08-01-2003, 01:29 AM
Did your friend use extensions? Did he determine for sure that his KR was real and not false knock?
Don't blame the fact that he was running open headers. There's something else afoot.
No extensions. It was false knock though. We put on the Mac Y-Pipe and no more probs...The car wouldnt pull for shit though. These LS1's like some backpressure. Thats what I learned
Don't blame the fact that he was running open headers. There's something else afoot.
No extensions. It was false knock though. We put on the Mac Y-Pipe and no more probs...The car wouldnt pull for shit though. These LS1's like some backpressure. Thats what I learned
Camaroholic
08-01-2003, 06:50 AM
FWIW, my car made 6 more RWHP with a good Y-pipe / cutout than it did with open headers. KR was not an issue, it's disabled in my PCM.
My Y- is dual 3's going to a Flowmaster collector / 3.5" out, to a 3.5" cutout (and then it necks down to go over the axle with a standard 3" pipe).
Of course, I'm still hauling the heavy muffler out back. ;)
-Andrew
My Y- is dual 3's going to a Flowmaster collector / 3.5" out, to a 3.5" cutout (and then it necks down to go over the axle with a standard 3" pipe).
Of course, I'm still hauling the heavy muffler out back. ;)
-Andrew