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Cobra Forums
2013-14 Shelby GT500
Post most recent pics of your '13-14 GT500
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<blockquote data-quote="Bad Company" data-source="post: 17023794" data-attributes="member: 141815"><p>I don't know if it is knowledge or obsession LOL</p><p></p><p>Car is currently producing 1070 on pump 93 and 1208 on pump E85. The car isn;t really that bad to drive at these power levels. It is a lot of fun and is easy to manage tire spin believe it or not.</p><p></p><p>The one thing that I do know that the 4.7L will have as an advantage is that it will not generate as much heat in the air as it flows through the SC. Also the rotors/compressor pack won't get as hot turning slower. I also realize after much discussion with Shawn that with the bypass/wastegate system he installs that the boost numbers at 2700 CFM of SC output that he can limit boost down low enough with the throttle blade wide open to around 6-7 psi. This can't be done with a bypass valve and a low vacuum signal at the TB with the standard KB bypass valve with the TB wide open(foot flat on the floor), you'll have all of the boost and airflow going into the engine. His system allows you to program boost like a turbocharger set up. So going to the bigger SC isn't a concern with pump 93 and driving on the street. To drive a 4.7L on the street took at least pump E85 in the past with a bypass valve. I can literally program the MoTec to only produce 600-700 Hp at the tires if that is all I want to drive to a car show or to the grocery store if the mood strikes me on the street. Shawn is really trying to get me to go to a 4.9, but I can't see the advantages being high enough. The jumps in airflow for a 1/8" upper pulley change are 80CFM. I also feel the TB will really start to become to restrictive, unless you go to a dual 106mm TB or even something bigger. The lowest amount of CFM output of a 4.9 with a 15% overdriver lower and a 4" upper is 2644 CFM, whereas the 4.7 will be 2536 CFM or I can change the upper to a 3 7/8" for 2618 CFM. I don't know if a 4.9 is worth it, but the kicker is it is only $200 more than a 4.7. What cha say everyone.........4.7 or 4.9????? LOL</p><p></p><p>My plans have always been since I started modifying the car to go to The Mile, the reason for it taking so long is after the engine failure the car has spent a very long time getting the engine rebuilt. During this time my wife's health degraded to the point where her doctors have for the last 3 years given her a 30% chance of passing away. Covid, her weak immune system and the sum of all of her health problems keep her home 99% of the time. She has asked me not to take the car to The Mile out of fear, fear that I'll get hurt and no one is here to take care of her and fear that if I get hurt and I need care she won't be able to provide it, so the car keeps evolving to a faster version of itself. I would think she'd allow me to go if I stop at the 200mph mark, which would probably take a full weekend event to achieve that in licensing anyway. She has been in a car with me in the distant past to 145-148 so I hope striving to go faster in a car with all of the safety precautions will ease her mind.</p><p></p><p></p><p>Yes I agree, the blue crinkle Whipple finish on that car looks very impressive under the hood</p></blockquote><p></p>
[QUOTE="Bad Company, post: 17023794, member: 141815"] I don't know if it is knowledge or obsession LOL Car is currently producing 1070 on pump 93 and 1208 on pump E85. The car isn;t really that bad to drive at these power levels. It is a lot of fun and is easy to manage tire spin believe it or not. The one thing that I do know that the 4.7L will have as an advantage is that it will not generate as much heat in the air as it flows through the SC. Also the rotors/compressor pack won't get as hot turning slower. I also realize after much discussion with Shawn that with the bypass/wastegate system he installs that the boost numbers at 2700 CFM of SC output that he can limit boost down low enough with the throttle blade wide open to around 6-7 psi. This can't be done with a bypass valve and a low vacuum signal at the TB with the standard KB bypass valve with the TB wide open(foot flat on the floor), you'll have all of the boost and airflow going into the engine. His system allows you to program boost like a turbocharger set up. So going to the bigger SC isn't a concern with pump 93 and driving on the street. To drive a 4.7L on the street took at least pump E85 in the past with a bypass valve. I can literally program the MoTec to only produce 600-700 Hp at the tires if that is all I want to drive to a car show or to the grocery store if the mood strikes me on the street. Shawn is really trying to get me to go to a 4.9, but I can't see the advantages being high enough. The jumps in airflow for a 1/8" upper pulley change are 80CFM. I also feel the TB will really start to become to restrictive, unless you go to a dual 106mm TB or even something bigger. The lowest amount of CFM output of a 4.9 with a 15% overdriver lower and a 4" upper is 2644 CFM, whereas the 4.7 will be 2536 CFM or I can change the upper to a 3 7/8" for 2618 CFM. I don't know if a 4.9 is worth it, but the kicker is it is only $200 more than a 4.7. What cha say everyone.........4.7 or 4.9????? LOL My plans have always been since I started modifying the car to go to The Mile, the reason for it taking so long is after the engine failure the car has spent a very long time getting the engine rebuilt. During this time my wife's health degraded to the point where her doctors have for the last 3 years given her a 30% chance of passing away. Covid, her weak immune system and the sum of all of her health problems keep her home 99% of the time. She has asked me not to take the car to The Mile out of fear, fear that I'll get hurt and no one is here to take care of her and fear that if I get hurt and I need care she won't be able to provide it, so the car keeps evolving to a faster version of itself. I would think she'd allow me to go if I stop at the 200mph mark, which would probably take a full weekend event to achieve that in licensing anyway. She has been in a car with me in the distant past to 145-148 so I hope striving to go faster in a car with all of the safety precautions will ease her mind. Yes I agree, the blue crinkle Whipple finish on that car looks very impressive under the hood [/QUOTE]
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