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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Lt1 Open Header Question

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Old Oct 9, 2007 | 02:39 PM
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Ronnie Abene's Avatar
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Default Lt1 Open Header Question
How long do your collectors have to be so you don,t screw up the oxegen sensors while running open headers??
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Old Oct 9, 2007 | 02:43 PM
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I dont think you will mess them up, they will just pull incorrect readings.I did mine with just the y pipes and did not like it!
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Old Oct 9, 2007 | 02:48 PM
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mine ran just fine on the dyno as far as a/f goes with headers dumped off the y-pipe
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Old Oct 9, 2007 | 03:38 PM
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Originally Posted by 94z28L
mine ran just fine on the dyno as far as a/f goes with headers dumped off the y-pipe
You mean cutout after the Y?
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Old Oct 9, 2007 | 04:41 PM
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When the pcm goes into VE (WOT) it doesn't care what the O2s say. They are for part throttle as far as I know.
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Old Oct 9, 2007 | 07:40 PM
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I think the problem you see with driveablilty with O2s and open headers is the fact that the sensor is so close to the open air that it tends to pick up the oxygen there and gives false readings. A cutout at the Y pipe would solve that problem. Cutout after the headers wouldn't be a big deal in a track situation since they are bypassed at WOT as mentioned.
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Old Oct 9, 2007 | 11:58 PM
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I run this race muffler welded right to the collectors on my Kook long tube headers and I have no problems

http://vibrantperformance.com/catalo...72bdcf414a8f7a
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Old Oct 10, 2007 | 01:11 AM
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Id love a sound clip of your car with those muffs !!
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Old Oct 10, 2007 | 10:24 AM
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Originally Posted by Transamman25
Id love a sound clip of your car with those muffs !!
I can get you one on the weekend but I will tell you it is far too loud for the street.
I dont really know how much they muffle the sound but I just use them because the race class I run in requires mufflers
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Old Oct 15, 2007 | 02:38 PM
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Originally Posted by dhdenney
You mean cutout after the Y?
no, just y-pipe, cats and cat back removed
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