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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
Full Race Stock Location Turbos
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<blockquote data-quote="full-race geoff" data-source="post: 1474454" data-attributes="member: 6864"><p>Turbo lag depends on which turbo size is selected and how hard the tuner is willing to push LSPI (low speed pre ignition)</p><p></p><p>600 at the crank on stock block appears to be the universally accepted safe limit. But, this is not black and white - the limit is not so much "power output" limit as it is "cylinder pressure" limit. And a bigger turbo will make more HP at lower cylinder pressure. (LSPI causes cylinder pressure to spike at low RPM and a leading cause of piston failure)</p><p></p><p>Ive had a number of meetings with Ford engineers and the key in making these motors live at high power levels always comes down to one factor - keeping cylinder pressure low. If you can reduce backpressure (larger turbine, larger housing, free flowing exhaust) and maintain sufficient fueling + conservative ignition values the setup can live. That said, it appears HP Tuners is the best way to tune a high power stock PCM Raptor. My personal daily driver has been at 510whp since day 1 (68k miles currently) and while we have not seen any EFR engine failures to date (stock or built) it is advisable to install a set of pistons and rods if you plan on making 600whp+</p><p></p><p>lastly - if you are considering a 600whp+ build, its somewhat worthwhile to consider an RMB longblock + turbo kit at the same time. RMB installs the Full Race turbokit on the longblock at no charge before shipping to his customers. This is a massive value add and saves an enormous amount of time and money in the long run</p></blockquote><p></p>
[QUOTE="full-race geoff, post: 1474454, member: 6864"] Turbo lag depends on which turbo size is selected and how hard the tuner is willing to push LSPI (low speed pre ignition) 600 at the crank on stock block appears to be the universally accepted safe limit. But, this is not black and white - the limit is not so much "power output" limit as it is "cylinder pressure" limit. And a bigger turbo will make more HP at lower cylinder pressure. (LSPI causes cylinder pressure to spike at low RPM and a leading cause of piston failure) Ive had a number of meetings with Ford engineers and the key in making these motors live at high power levels always comes down to one factor - keeping cylinder pressure low. If you can reduce backpressure (larger turbine, larger housing, free flowing exhaust) and maintain sufficient fueling + conservative ignition values the setup can live. That said, it appears HP Tuners is the best way to tune a high power stock PCM Raptor. My personal daily driver has been at 510whp since day 1 (68k miles currently) and while we have not seen any EFR engine failures to date (stock or built) it is advisable to install a set of pistons and rods if you plan on making 600whp+ lastly - if you are considering a 600whp+ build, its somewhat worthwhile to consider an RMB longblock + turbo kit at the same time. RMB installs the Full Race turbokit on the longblock at no charge before shipping to his customers. This is a massive value add and saves an enormous amount of time and money in the long run [/QUOTE]
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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
Full Race Stock Location Turbos
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