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The Terminator
Engine/Tuning
How much does timing affect power? Turn down boost to turn up timing?
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<blockquote data-quote="TheFleshRocket" data-source="post: 15756883" data-attributes="member: 48535"><p>You guys are probably getting sick of my questions but.. I'll ask anyway.</p><p></p><p>I'm currently running a TVS with a 2.8" pulley, 16.5* of timing, and 93 + booster. I have a heat exchanger on the to-do list to get IAT2 readings down, but I'm debating a smaller pulley.</p><p></p><p>When I originally got my Cobra, it had a stock Eaton with a 2.76. According to the printout I got with the car, it was tuned for 20-23* of timing, and I'm guessing that it peaked at around 14PSI. (I didn't have an overlay or boost gauge, so that's speculation.) I ran the car like that for 25K miles. It was super punchy and didn't seem to noticeably heat soak or lose power even when I drove it hard. (It did lose power when I did a track day and IAT2 readings got into the 170s during 20 minute sessions, though.)</p><p></p><p>I'm seeing 19 PSI, dropping to 18 after 6000RPM, with the 2.8 pulley, and running 16.5* of timing as mentioned above. </p><p></p><p>The 3.0 pulley is supposed to be good for 16-17 PSI, so I feel like I could run 18-19* of timing on 93 + booster.</p><p></p><p>The 3.2 pulley is supposed to be good for 14-15 PSI, so just about the same as what the engine saw with the 2.76 Eaton on up to 23* of timing. I wonder if I could run 21-22* of timing on 93 + booster, with the 3.2 pulley. </p><p></p><p>So, how much does timing affect power compared to boost? Does it makes sense to drop boost by ~2 PSI and run a little more timing, or drop boost by ~4 PSI and run even more timing?</p></blockquote><p></p>
[QUOTE="TheFleshRocket, post: 15756883, member: 48535"] You guys are probably getting sick of my questions but.. I'll ask anyway. I'm currently running a TVS with a 2.8" pulley, 16.5* of timing, and 93 + booster. I have a heat exchanger on the to-do list to get IAT2 readings down, but I'm debating a smaller pulley. When I originally got my Cobra, it had a stock Eaton with a 2.76. According to the printout I got with the car, it was tuned for 20-23* of timing, and I'm guessing that it peaked at around 14PSI. (I didn't have an overlay or boost gauge, so that's speculation.) I ran the car like that for 25K miles. It was super punchy and didn't seem to noticeably heat soak or lose power even when I drove it hard. (It did lose power when I did a track day and IAT2 readings got into the 170s during 20 minute sessions, though.) I'm seeing 19 PSI, dropping to 18 after 6000RPM, with the 2.8 pulley, and running 16.5* of timing as mentioned above. The 3.0 pulley is supposed to be good for 16-17 PSI, so I feel like I could run 18-19* of timing on 93 + booster. The 3.2 pulley is supposed to be good for 14-15 PSI, so just about the same as what the engine saw with the 2.76 Eaton on up to 23* of timing. I wonder if I could run 21-22* of timing on 93 + booster, with the 3.2 pulley. So, how much does timing affect power compared to boost? Does it makes sense to drop boost by ~2 PSI and run a little more timing, or drop boost by ~4 PSI and run even more timing? [/QUOTE]
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How much does timing affect power? Turn down boost to turn up timing?
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