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SVT Shelby GT500
Octane Vs Boost
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<blockquote data-quote="IronTerp" data-source="post: 11850184" data-attributes="member: 12702"><p>Generally, the 91 vs 93 tune explanation is realistically just a matter of how much advance timing your tuner installs in his tune. Certain tuners will also manipulate air/fuel ratio with their street vs. race tunes as well. The last 4 custom tuning sessions that I've gotten for my cars, I worked with my tuner in deciding what timing to run on each of the 3 specific tunes that he devised for me, (the Xcal hand held tuners store 3 custom tunes, plus a slot for storing your original factory tune). </p><p></p><p>Back in the "day" with the 03/04' Cobras, it wasn't uncommon at all for a street tune to run 23 degrees of timing with 93 octane and 500+/- RWHP. Nowadays that would be considered very aggressive, especially with the advent of the GT500 where 575+ RWHP occurs much more frequently. Each tuner has his own philosophy here, but a typical 600 RWHP "91 octane street tune" could be in the 17-18 degrees of timing range, while a "93 octane tune" would be more around 20 degrees. I always have access to 93 octane and run a "conservative" 19 degree street tune and a more "aggressive" 21 degree street tune. (I have to save the 3rd slot on the Xcal III for a catted tune to get through emissions here in TN!). When going to the track and utilizing 100+ octane fuel, the plan will be to add timing through the Xcal's user application function to either 22 or 23 degrees of advance timing.</p><p></p><p>Soooo....search and ask around the folks here on SVTP and figure out what advance timing levels you want for your "safe" street tune, your "aggressive" street tune, and maybe a 3rd for your "race" track tune if you're planning on drag racing your GT500 at some point.</p></blockquote><p></p>
[QUOTE="IronTerp, post: 11850184, member: 12702"] Generally, the 91 vs 93 tune explanation is realistically just a matter of how much advance timing your tuner installs in his tune. Certain tuners will also manipulate air/fuel ratio with their street vs. race tunes as well. The last 4 custom tuning sessions that I've gotten for my cars, I worked with my tuner in deciding what timing to run on each of the 3 specific tunes that he devised for me, (the Xcal hand held tuners store 3 custom tunes, plus a slot for storing your original factory tune). Back in the "day" with the 03/04' Cobras, it wasn't uncommon at all for a street tune to run 23 degrees of timing with 93 octane and 500+/- RWHP. Nowadays that would be considered very aggressive, especially with the advent of the GT500 where 575+ RWHP occurs much more frequently. Each tuner has his own philosophy here, but a typical 600 RWHP "91 octane street tune" could be in the 17-18 degrees of timing range, while a "93 octane tune" would be more around 20 degrees. I always have access to 93 octane and run a "conservative" 19 degree street tune and a more "aggressive" 21 degree street tune. (I have to save the 3rd slot on the Xcal III for a catted tune to get through emissions here in TN!). When going to the track and utilizing 100+ octane fuel, the plan will be to add timing through the Xcal's user application function to either 22 or 23 degrees of advance timing. Soooo....search and ask around the folks here on SVTP and figure out what advance timing levels you want for your "safe" street tune, your "aggressive" street tune, and maybe a 3rd for your "race" track tune if you're planning on drag racing your GT500 at some point. [/QUOTE]
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