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2015+ Shelby GT350 Mustang
How risky to buy a whipple’d 350 - preowned?
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<blockquote data-quote="ANGREY" data-source="post: 16452065" data-attributes="member: 188865"><p>The old limitations and metrics aren't as big of a concern anymore.</p><p></p><p>Firstly, you don't NEED crazy boost to get a 5.2/5.0 motor to make more power than the chassis can realistically use anymore. The days of having to run 20 psi of boost to get tons of power and torque are gone.</p><p></p><p>The motor (5.2) already starts very high flowing, so if you cram 15 psi of boost (and double the output) you're talking about 1000 rwhp. These motors can easily make 800 rwhp barely breaking double digit boost levels. That's because the heads, cams, exhaust, intake side are already high flowing and the motors aren't the old "set the timing and forget it" there's a multitude of sensors and adjustments the motor makes to get optimal power and torque at all/most conditions (rpm/throttle position, etc).</p><p></p><p>With E-85, 12:1 compression isn't just "safe" anymore, it's actually preferable. 12:1 is a huge liability on anything more than moderate boost WITH PUMP 93, just given how inconsistent the quality of gasoline can be. one bad batch of fuel and boom. With E-85, it allows more resistance to preignition and detonation, allows more timing (aka more power) and the user can actually monitor/confirm it's quality with simple vial testing. (unlike 93 where you either roll the dice or add octane booster to every tank). E85 is a dedicated pump as well so you don't have to worry about the last person filling up on 87 and getting the first bit of low quality fuel until it starts pumping 93.</p><p></p><p>These cars (on E-85) respond to boosting REALLY well up to at least 12 psi before any real concern kicks on. There's plenty of safety features in the tuning and ECM management of the motor with fuel/spark/timing.</p><p></p><p>The crank is the crank is the crank. Virtually no one pays $5k for a billet crank and outside of that, nearly every boosted car I've seen in the past 30 years uses the same standard forged OEM cranks. My first built motor (modular 5.4) had billet race everything and....a forged OEM crank. Billet cranks are out there, but they're wildly expensive and custom. The forged cranks are good for anything most mortals can throw at them.</p><p></p><p>Like I said earlier, with 19" wheels and 30 or 35 profile street radials, the driveline becomes less of a liability (except for the clutch) because you'll spin the wheels before you snap the gears or shafts. Throw on some 15" DR's with enough sidewall to flex and actually grip and now all that torque is going SOMEWHERE and the stock drivetrain WILL break somewhere.</p><p></p><p>So in summary, replace the OPG's/Sprocket, run E-85, test for good quality and let it rip. Plenty of GT350's with blown setups running around at 700-850 rwhp doing just great. With a 12% drivetrain loss that's 850-970 horsepower at the crank.</p><p></p><p>Outside of 1/2 mile racing and roll racing, that's way more power than anyone can use on a GT350 chassis. It just becomes a fun power rocket on roller skates.</p></blockquote><p></p>
[QUOTE="ANGREY, post: 16452065, member: 188865"] The old limitations and metrics aren't as big of a concern anymore. Firstly, you don't NEED crazy boost to get a 5.2/5.0 motor to make more power than the chassis can realistically use anymore. The days of having to run 20 psi of boost to get tons of power and torque are gone. The motor (5.2) already starts very high flowing, so if you cram 15 psi of boost (and double the output) you're talking about 1000 rwhp. These motors can easily make 800 rwhp barely breaking double digit boost levels. That's because the heads, cams, exhaust, intake side are already high flowing and the motors aren't the old "set the timing and forget it" there's a multitude of sensors and adjustments the motor makes to get optimal power and torque at all/most conditions (rpm/throttle position, etc). With E-85, 12:1 compression isn't just "safe" anymore, it's actually preferable. 12:1 is a huge liability on anything more than moderate boost WITH PUMP 93, just given how inconsistent the quality of gasoline can be. one bad batch of fuel and boom. With E-85, it allows more resistance to preignition and detonation, allows more timing (aka more power) and the user can actually monitor/confirm it's quality with simple vial testing. (unlike 93 where you either roll the dice or add octane booster to every tank). E85 is a dedicated pump as well so you don't have to worry about the last person filling up on 87 and getting the first bit of low quality fuel until it starts pumping 93. These cars (on E-85) respond to boosting REALLY well up to at least 12 psi before any real concern kicks on. There's plenty of safety features in the tuning and ECM management of the motor with fuel/spark/timing. The crank is the crank is the crank. Virtually no one pays $5k for a billet crank and outside of that, nearly every boosted car I've seen in the past 30 years uses the same standard forged OEM cranks. My first built motor (modular 5.4) had billet race everything and....a forged OEM crank. Billet cranks are out there, but they're wildly expensive and custom. The forged cranks are good for anything most mortals can throw at them. Like I said earlier, with 19" wheels and 30 or 35 profile street radials, the driveline becomes less of a liability (except for the clutch) because you'll spin the wheels before you snap the gears or shafts. Throw on some 15" DR's with enough sidewall to flex and actually grip and now all that torque is going SOMEWHERE and the stock drivetrain WILL break somewhere. So in summary, replace the OPG's/Sprocket, run E-85, test for good quality and let it rip. Plenty of GT350's with blown setups running around at 700-850 rwhp doing just great. With a 12% drivetrain loss that's 850-970 horsepower at the crank. Outside of 1/2 mile racing and roll racing, that's way more power than anyone can use on a GT350 chassis. It just becomes a fun power rocket on roller skates. [/QUOTE]
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How risky to buy a whipple’d 350 - preowned?
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