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SVT Shelby GT500
pulley with and without tune on a 12
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<blockquote data-quote="RedVenom48" data-source="post: 15665001" data-attributes="member: 166576"><p>Honestly, with just a pulley and tune your not pegging the stock intake. Its future POTENTIAL to make power is capped. Factory ignition timing maps, fuel maps etc are all tied to the known intake size, cooling capacity of the stock intercooler system (boost discharge temps), a 180 degree T-stat for the engine cooling system and fuel octane supplied. Size of the throttle body is also taken into account.</p><p></p><p>A dual fan triple pass heat exchanger, and installation of a 170F degree T-stat will open up the potential in a tune from the likes of Lund and VMP etc. Add a higher flowing Throttle body and off road exhaust and your potential goes up even more. The upgraded 120mm intakes will be adjusted via MAF curve allowing more fueling capacity. Understand, we arent talk earth shattering increases in power, but each mod supports the next. BJ from VMP, Matt from Billet Pro Shops and many members here on this board have taken their M122 powered GT500s into the 10s. Intake, pulley, heat exchangers, t stat, tune, throttle body, in some cases porting the m122, exhaust and suspension and TIRE selection all play a factor.</p><p></p><p>Spark plugs are another area where you'll have to account for the high boost capable with the smaller pulley. I run, and many here also run, the NGK TR7IX. Its 2 steps colder than the stock plug. Its to help reduce the possibility of the spark plug overheating from the increased power (heat) of the higher boost AF mixture. An overheated spark plug will deteriorate and lead to preignition. In a boosted car like ours, thats almost certain engine damage if not regularly checked. A colder plug will normalize this "wear" on the plug. If gapped properly, a colder range plug like the TR7IX should work with the factory tune.</p><p></p><p>Honestly though, Id give your tuner a call, send data logs and get that tune working for your car. Factory tune can only take into account so much before it falls outside its parameters. The custom tune will take all this into account and make sure all the mods done to the car are contributing.</p><p></p><p>Remember though, quality fuel is paramount. The most 91 pump gas can typically handle is 15 psi or so. 93 gives you a little bit more room to play but it tops out I think around 16-17 psi. The 2010-2014 GT500s come with a factory knock sensor setup. Based on the knock detected, it attempts to give the most aggressive spark advance the fuel can support. So a min octane of 91 can be used all the way to 93 with no needed input from the driver.</p></blockquote><p></p>
[QUOTE="RedVenom48, post: 15665001, member: 166576"] Honestly, with just a pulley and tune your not pegging the stock intake. Its future POTENTIAL to make power is capped. Factory ignition timing maps, fuel maps etc are all tied to the known intake size, cooling capacity of the stock intercooler system (boost discharge temps), a 180 degree T-stat for the engine cooling system and fuel octane supplied. Size of the throttle body is also taken into account. A dual fan triple pass heat exchanger, and installation of a 170F degree T-stat will open up the potential in a tune from the likes of Lund and VMP etc. Add a higher flowing Throttle body and off road exhaust and your potential goes up even more. The upgraded 120mm intakes will be adjusted via MAF curve allowing more fueling capacity. Understand, we arent talk earth shattering increases in power, but each mod supports the next. BJ from VMP, Matt from Billet Pro Shops and many members here on this board have taken their M122 powered GT500s into the 10s. Intake, pulley, heat exchangers, t stat, tune, throttle body, in some cases porting the m122, exhaust and suspension and TIRE selection all play a factor. Spark plugs are another area where you'll have to account for the high boost capable with the smaller pulley. I run, and many here also run, the NGK TR7IX. Its 2 steps colder than the stock plug. Its to help reduce the possibility of the spark plug overheating from the increased power (heat) of the higher boost AF mixture. An overheated spark plug will deteriorate and lead to preignition. In a boosted car like ours, thats almost certain engine damage if not regularly checked. A colder plug will normalize this "wear" on the plug. If gapped properly, a colder range plug like the TR7IX should work with the factory tune. Honestly though, Id give your tuner a call, send data logs and get that tune working for your car. Factory tune can only take into account so much before it falls outside its parameters. The custom tune will take all this into account and make sure all the mods done to the car are contributing. Remember though, quality fuel is paramount. The most 91 pump gas can typically handle is 15 psi or so. 93 gives you a little bit more room to play but it tops out I think around 16-17 psi. The 2010-2014 GT500s come with a factory knock sensor setup. Based on the knock detected, it attempts to give the most aggressive spark advance the fuel can support. So a min octane of 91 can be used all the way to 93 with no needed input from the driver. [/QUOTE]
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pulley with and without tune on a 12
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