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07-30-2008, 05:19 PM
| #11 |
| Senior Member Join Date: Jul 2008
Posts: 108
 | I will make that suggestion to my bro about the K&N and Flowmasters. I am sure speed makes a big differance if you are going 60. Believe it or not, I can tell a differance in fuel mileage from 72mph and 75mph. We also forget, more speed = more wind resistance and to be at just the right RPM for maximum fuel efficiency depending on engine timing, igniton timing, cam dimensions and gear ratios. |
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07-30-2008, 06:01 PM
| #12 |
| Full Member  Join Date: Jul 2008 Location: North Idaho
Posts: 24
| Don't forget about octane levels. I run 92 octane. At 87 I see a reduction in mileage as well as performance. Let your bro know too that with changing the exhaust, to have a tech set up the emissions cpu for the type of exhaust he is running. |
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07-30-2008, 06:06 PM
| #13 |
| Full Member Join Date: Jul 2008 Location: North Idaho
Posts: 24
| Also have him check out gmtuner.com Tons of tech for the 8.1 as well as 6.0 and 5.3 |
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07-30-2008, 08:39 PM
| #14 |
| Senior Member Join Date: Jul 2008
Posts: 108
| 10-4 Thanks for the info. I was aware to reprogram the PROM Chip in the ECM when you make changes to the exhaust. Should probably be done for even on the K&N air intake too or it would give funky readings to the MASS air flow sensor and even possible I guess for the MAP sensor too. Give all kinds of funky reading and send out bad instructions to the engine timing and a/f mixtures and hurt fuel mileage rather than help. |
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08-04-2008, 12:16 PM
| #15 |
| Senior Member Join Date: Jun 2008 Location: NY
Posts: 83
| hmmm..... size |
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