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The Terminator
Engine/Tuning
What's the best cams for 03 terminator
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<blockquote data-quote="tt335ci03cobra" data-source="post: 16486297" data-attributes="member: 68944"><p>On a stock ecu street car terminator running full or near full weight and obviously capped to 7000rpm, maybe 7250rpm (ecu accuracy), a stage 2 cam for 2000-7000rpm or 2250-7250rpm is the most you can realistically justify.</p><p></p><p>more you open up the valve timing, more you open up high rpm performance ha low rpm performance.</p><p></p><p>lower rpm needs an ample amount of time to fully combust. If you open the valves too soon, (or leave them open too long basically), the combustion is less complete, the explosion is smaller, and the power generated is less. </p><p></p><p>you’re essentially letting the flame experience some wind which is blowing it out, much like a lighter on a windy day outside. How much so is dependent on how much rpm, and the given mill’s geometry.</p><p></p><p>putting a race cam or race intake on a street car is going to be terrible for drivability, just as putting a 106mm turbo on a 3L is. Sure it’s great once the engine (air pump) is up to speed, but it makes getting up to speed take much longer.</p><p></p><p>flooding a motor with air or fuel will make it very lazy. Leaning it out will and running optimum air flow with the lesser amount of fuel safely needed and no more will yield great results. </p><p></p><p></p><p></p><p></p><p>On a 4.6 8.5:1 terminator Eaton blower car, a gt500 cam quartet from 2013/14 is probably a hair big as they're designed for the 5.4-5.8L combustion chambers and head architecture.</p><p></p><p></p><p>I think it’s less expensive to do a 2013 gt500 cam, sure, but there are probably better specced cams for 7000-7250rpm on a 4.6 terminator mill with stock c heads or mild c heads.</p><p></p><p>get a spec card for a proper stage 2 comp cam or crower cam or off the shelf MMR blower cam in that rpm range for a 4.6 Eaton blower terminator and compare it to the spec card on the gt cams.</p><p></p><p>if they are very similar in the important areas then save the cash and pick those up but if not, it could make the engine laggier and want for 7500-8000rpm of airflow (or whereever a 4.6 8.5:1 Eaton at 15psi might have the same cfm airflow of a 5.4 or 5.8 gt500 mill at 6500-7000rpm)</p><p></p><p></p><p>The point is you want to spec cams that match the airflow needed to optimize what you are working with.</p><p></p><p>good luck</p></blockquote><p></p>
[QUOTE="tt335ci03cobra, post: 16486297, member: 68944"] On a stock ecu street car terminator running full or near full weight and obviously capped to 7000rpm, maybe 7250rpm (ecu accuracy), a stage 2 cam for 2000-7000rpm or 2250-7250rpm is the most you can realistically justify. more you open up the valve timing, more you open up high rpm performance ha low rpm performance. lower rpm needs an ample amount of time to fully combust. If you open the valves too soon, (or leave them open too long basically), the combustion is less complete, the explosion is smaller, and the power generated is less. you’re essentially letting the flame experience some wind which is blowing it out, much like a lighter on a windy day outside. How much so is dependent on how much rpm, and the given mill’s geometry. putting a race cam or race intake on a street car is going to be terrible for drivability, just as putting a 106mm turbo on a 3L is. Sure it’s great once the engine (air pump) is up to speed, but it makes getting up to speed take much longer. flooding a motor with air or fuel will make it very lazy. Leaning it out will and running optimum air flow with the lesser amount of fuel safely needed and no more will yield great results. On a 4.6 8.5:1 terminator Eaton blower car, a gt500 cam quartet from 2013/14 is probably a hair big as they're designed for the 5.4-5.8L combustion chambers and head architecture. I think it’s less expensive to do a 2013 gt500 cam, sure, but there are probably better specced cams for 7000-7250rpm on a 4.6 terminator mill with stock c heads or mild c heads. get a spec card for a proper stage 2 comp cam or crower cam or off the shelf MMR blower cam in that rpm range for a 4.6 Eaton blower terminator and compare it to the spec card on the gt cams. if they are very similar in the important areas then save the cash and pick those up but if not, it could make the engine laggier and want for 7500-8000rpm of airflow (or whereever a 4.6 8.5:1 Eaton at 15psi might have the same cfm airflow of a 5.4 or 5.8 gt500 mill at 6500-7000rpm) The point is you want to spec cams that match the airflow needed to optimize what you are working with. good luck [/QUOTE]
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