My old ride
Lancia Delta HF Martini turbo
350 hp 0-100kph(60Mph)-4 sec
0-165kph (100mph)-8 seconds
Fast! sold it for the Accord
*warning* this is only ... Show moremy own personal experience i will not take responsibilty if you decide to do anything i am talking about and blow up something or hurt yourself. If you do do something do not harrass me i hope you may learn something thow.
......and yes i have blown things up before
Many people would like to add some power to thier ride.
- The basic concept of building power is simple
- get as much air/fuel in and out of you engine as quickly and effeciently as possible.
So how do you add power
Some resort to forced induction while others maintain a normally aspirated stance.
Basic functions of a 4 cycle engine(car engine) is to pull air and fuel in, compress it, combust it and expend the burned gas.
working with those functions is where you can build power
lets start with the intake stroke
some of the things you can do to increase the volumetric efficiency-
*start with a cold air intake it is less restricive than the factory airbox and will allow the engine to suck air easier and may increase the overall air volume being taken into the engine. Most automobile fuel systems can support the additional air flow of this mod.(The engine will likely make a gurgling noise under accelaration, this is normal, in turbo charged vehicles you may hear hissing under acceleration and a chatter upon throttle realease) gains from 2-25 horsepower can be expected depending on the application,- turbo usually more.
more advanced mods would be
*Camshafts-higher lift(increased airflow)
and longer flow duration
*Injectors-Compensate for additional air
*Fuel pump-additional fuel pressure and fuel support
*Fuel rail- maintains enough gas to feed the injectors
*Fuel pressure regulator- can raise the fuel system pressure to add additional gas to the injectors example a 19lb per hour injector can become a 23lb per hour injector by raising the fuel pressure
*Intake manifold/porting manifold- can increase volume, change velocity, increase effeciency by removing factory casting marks(turbulence).
*head porting- Changes airflow and can flow higher #'s at different rpms within desired port/Combustion chamber designs and cam specifications. Note if no cam or engine work is done stick with a mild deburr and polish job) no smoother than 4-600 grit on the intake side to keep the fuel from pooling and running down into the cylinder
Increasing boost pressure- * How To do it as safe as possible*
**I will tell you to read this as carefully as possible##
Different vehicles have different oppurtunities based off the size of the factory fuel system and injectors if you get greedy you could "fast and furious" yourself and easily "fry piston rings and blow the welds on the intake" ok maybe not but you could over knock your engine and cause detonation damage
If equiped with boost sensor, you can raise your turbos boost pressure to various levels and gain alot of extra power.
What you do is connect a small adjustable valve, for either an air compressor, hydraulics or other and the propper fittings from a hardware store (Home dep.) small enough to fit on vacuum lines 1/4-3/8" in diameter $5-$20.
the valve sends a smaller pressure signal to the computer and prevents the engine from cutting the spark/fuel. The auto manufactures do this to stop the engine from over boosting the factory parameters.
Most factory fuel systems can support approximately 15% more than what they usally run at. This is due to an engine safety zone, atmospheric changes(cooler temps require more fuel to prevent detonation of the extra air density), manufacturer safety requirements,ect...
However not all can! Reasearch your cars system before advancing.
If your unsure where your sensor is start by locating all the vacuum lines coming from your intake/intercooler or intake manifold piping to other sections of the car. Some where you will usually find a soleniod or a small box at the end. This will either be the wrong thing or the right thing. MAP sensor is the wrong thing.
The boost control is usually a soleniod with an entrance and an exit that senses pressure and adjust the pressure flow to the wastegate to open and close it.
If you have this animal, replace it with a valve and use the valve to adjust the to the propper safe limit. doing this you will notice better gains throughout the entire Rpm range.
Extra advice, if you don't have a knock sensor that allows safer operation of the valve be very frugal. If you do you can let the EMS do most the work that as soon as it senses a little knock the computer supplys more fuel or cuts the spark to prevent it.
to adjust the valve remember your only fooling the computer.
YOU CLOSE THE VALVE FOR MORE BOOST OR OPEN IT FOR LESS BOOST
To be continued...... Show Less