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Message: <blockquote data-quote="HP Gila" data-source="post: 558983" data-attributes="member: 7623">It is good here to simply control some technical know-how in building a drift 4AG engine with only 1.3kg/cm pressure and the linearly output to 280hp @about 8000 rpm.<ul> <li data-xf-list-type="ul">What is interesting to me about the piston or valves damage is how high it spikes the internal combustion pressure. If it is uncontrolled, and that is what damages the rings, kill bearings and can even breaks the valves, especially when the good breathing 5 valves/cyl. engine rev. more than 9000rpm.The original 4AG silicone-aluminum alloy piston with thermo barrier coating on it, have the similar design of most proven turbo pistons from JE or Arias which uses to stand high hp. The 5 per cyls. light weight valves stress even by putting 30% more springs load with the std. cams lift is too safe to rev. to around 8000 in this 4AG 20.</li> </ul> <ul> <li data-xf-list-type="ul">If you turbocharged any engine in the 80’- Those days lowering CR to 7.0 produce big horsepower numbers without strain on the engine look good is due to lack of today’s high precision & resolution electronic technology. A well-prepaid 4AG 20 engine with 9.5 to 1 CR with 1.5kg/cm of boost added have the combustion pressure of around 1500 psi only able to produce 320hp. If compares the higher 9.5CR. & 8.0CR, the air-fuel mix is compressed more as the compression pressure goes up; it becomes hotter and has a fast burn rate to aids turbo spool-up time.</li> </ul> <ul> <li data-xf-list-type="ul">In the task of ECU. Any good tuners agree that there are thousands of factory ECU engineers in Toyota in designing & commanding the high bits microprocessor data & the fast response hardware & software of the 4AG ECU. Why spend too much time to rip-out the beauty and good works of engineers of the original ECU if you skilled enough to provide correct mixture ratio & sparking time? In addition, VVT only like negative going pulse to trigger valve. </li> </ul></blockquote>

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