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Unread 12-09-2011, 06:05 PM   #1
tdeal74
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2005 TJ Wrangler 
 
Join Date: Dec 2011
Posts: 6
Gas/air ratio

I have an 05 TJ, 4L, bolted on new air intake, throttle body spacer, stage one chip. I'm wondering if I need to reflash the CPU to ensure proper gas to air ratio. Sub question, new MAP sensor required?

Also, anyone running headers to a cat-back exhaust? If so, pros & cons?

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Unread 12-09-2011, 06:25 PM   #2
ajmorell
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Location: Santa Fe, New Mexico
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Quote:
Originally Posted by tdeal74
I have an 05 TJ, 4L, bolted on new air intake, throttle body spacer, stage one chip. I'm wondering if I need to reflash the CPU to ensure proper gas to air ratio. Sub question, new MAP sensor required?

Also, anyone running headers to a cat-back exhaust? If so, pros & cons?
No, the current sensors should allow the AFR to run around stoichiometric (14.7)
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Unread 12-09-2011, 06:35 PM   #3
tdeal74
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2005 TJ Wrangler 
 
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Cool, so you went a lil over my head but if I understand you correctly, the CPU will adjust itself. In other words the electronics will do their jobs and correct the ratio. Thanks for the input!
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Unread 12-09-2011, 10:46 PM   #4
jnicewan
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1995 ZJ 
 
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Speed density systems can only make small adjustments to fuel trim and they only do that on a warm engine and other than wide open throttle (closed loop). Basically saying you can make minor engine enhancements, or add minor bolt-ons to the engine and the computer may be able to compensate as long as the oxygen sensor picks up the difference. The oxegon sensor is not used on a cold engine or during wide open throttle.
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Unread 12-12-2011, 10:03 PM   #5
444
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I wouldn't worry about it. Those aftermarket intakes on most vehicles don't make any difference other than sound anyway.
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Unread 09-11-2013, 04:44 AM   #6
jeepter
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1998 TJ Wrangler 
 
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I would agree just changed back from a cold air pod filter to the standard air box concerned the after market pod no suited too off road use with no differences apart from sound .. !
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