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Cobra Forums
The Terminator
Engine/Tuning
Retune After 8 Years
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<blockquote data-quote="351stang" data-source="post: 15497407" data-attributes="member: 1355"><p>Guys,</p><p></p><p>I'm wondering how many people have had to retune their cars with just the passage of time. I pullied my 2004 Cobra back in 2008 and haven't done any engine/air/fuel mods since then. I noticed that the car was running leaner via my Wideband, so I replaced the oxygen sensor to eliminate that variable. I also checked for vacuum leaks and found none. </p><p></p><p>I put the car on the dyno and used both my wideband to log and the shop's wideband. It appears that the A/F ratio has drifted up from 11.5-11.9 range to 11.8-12.4 range. </p><p></p><p>I went back and looked at the old 2008-year livelink data logs and RTLS_FPUMP_DTYC maxed out at .96. The new 2016 dyno runs show RTLS_FPUMP_DTYC hitting .99 at 5900 RPM. Ambient air temps were 20 degrees cooler and lower humidity comparing the two files. The corrected power numbers dropped from 460 rwhp to 445 rwhp.</p><p></p><p>It looks to me like the car has always been close to maxing out the pumps, so I've ordered a boost a pump. </p><p></p><p>What I don't get is why my A/F ratio has drifted up prior to 5900 RPM when the pump duty cycle is not yet maxed. </p><p></p><p>I'm planning on adding the BAP with 10 AWG power feed, re-logging, and will get a new tune if necessary. Am I missing anything here or should I investigate something else?</p></blockquote><p></p>
[QUOTE="351stang, post: 15497407, member: 1355"] Guys, I'm wondering how many people have had to retune their cars with just the passage of time. I pullied my 2004 Cobra back in 2008 and haven't done any engine/air/fuel mods since then. I noticed that the car was running leaner via my Wideband, so I replaced the oxygen sensor to eliminate that variable. I also checked for vacuum leaks and found none. I put the car on the dyno and used both my wideband to log and the shop's wideband. It appears that the A/F ratio has drifted up from 11.5-11.9 range to 11.8-12.4 range. I went back and looked at the old 2008-year livelink data logs and RTLS_FPUMP_DTYC maxed out at .96. The new 2016 dyno runs show RTLS_FPUMP_DTYC hitting .99 at 5900 RPM. Ambient air temps were 20 degrees cooler and lower humidity comparing the two files. The corrected power numbers dropped from 460 rwhp to 445 rwhp. It looks to me like the car has always been close to maxing out the pumps, so I've ordered a boost a pump. What I don't get is why my A/F ratio has drifted up prior to 5900 RPM when the pump duty cycle is not yet maxed. I'm planning on adding the BAP with 10 AWG power feed, re-logging, and will get a new tune if necessary. Am I missing anything here or should I investigate something else? [/QUOTE]
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Retune After 8 Years
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