Originally Posted by
jimmyc
produces much more whp then it is rated at the flywheel from the factory
They all play games with the "Advertised" hp numbers through the years. That is why the SAE produced a certifiable standard(which is better than nothing). And if they are understated then yes the 25% number "may" work. Also you can make any vehicle make high gains (Dyno queens) but how long is it going to last?
I guess my point is that with the more modern vehicles and designs come more modern systems (EFI, Exhaust, Cooling, Intake, Valvetrain). Those systems are under tighter control to squeeze out the last amount of performance, be it WHP, Fuel Economy, Emmissions, or Reliability. Think of it as a box with each one in a corner. The design of the motor is looking to hit a defined target for that market. So if you take a motor designed for Fuel Economy, Emmissions, or Reliability and slide it to the performance corner larger gains will be realized. But if you already have a system designed for performance (usually with a touch of emmissions and reliability) the gains will not be as large (10-18)%.
Many of the Celica owners have found simple ported stock headers to be a best bet on a NA motor. I find a 25% gain on a 2zz-ge to be absurd (and I am fine with that). I am sure there are other examples out there that have the same issues.
Derek
#76 ITR Toyota Celica GTS
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