God i cant believe im actually going to post this here with all this tension , but here it goes.
**climbs into saddams bunker***
First of all whoever would like to listen fine, whoever doesnt ,please dont flame this is my opinion substantiated by some relevant design theory.
Every engine in the world is designed with a certain potential power level that it can produce. This being said , value X HP and torque is produced on a stand. No restrictions , in a controlled envirement and so on and so on. I think i am speaking to people with some common sense so i dont have to go any deeper with that.
When an engine is installed on the car of choice many modifications to the intake , exhaust, restraint and drivetrain have restricted a certain amout of power that can be delivered to the wheels.
what im saying is simple, the engine is allready able to put out XXX HP . You are NOT CREATING more unless you change the variables used to make a more efficient combustion process.Cooler ambient air, a more strictly controlled pressurized manifold air charge , higher flow capacity exhaust, ETC.
Now IMO i think it is possible (percentage wise) to get that additional HP. BUT ITS TOUGH. Now you all need to understand that once you change the diameter of a downpipe from the original turbo (DOESNT MATTER IF ITS A T25), you are increasing the pressure differential in the exhaust system. That pressure diff. is what spools up a turbo FASTER. How does it do that you ask? well for those who dont know when you increase the downpipe diameter you are increasing the flow capacity of the system. You are creating a larger negative pressure after the the turbine wheel which will induce the exhaust gas to the larger (more negative) side faster to balance the system. Velocity will slow slightly but the additional force at the higher RPM will allow it move much more efficiently.
Now by increasing spoolin efficiency and and decreasing "lag time" your boost pressure will allow for a more dense mixture earlier in the rpm band. That is where you want it because your cam profile can use it and put it to work. Once you have generated enough torque down low, it is just a matter of maintaining it.AHHH the job of Horsepower comes in now. Add the the larger capacity exhaust and free flowing intake, rich mixture at higher rpm, constant boost against the valves across the entire rpm range and there you have it!!
It is much easier to make the power the engine was designed to put out once the (airpump) engine can breathe.Especially on the top end of the rpm band
In closing, i am not sure whether or not this or any mod that he has done has allowed this HP potential. But i am sure that it is possible.
Its amazing what forced induction can do to volumetric efficiency for the engine when it is allowed to proccess the air it is given
