| Ranzo |
05-16-2004 08:57 PM |
CFM = Cubic Feet per Minute. This is the standard for detailing the amount of air being processed by a engine. Just like the old V8 gearheads when they talk about a 650holley......that is a 650CFM carburator. That means that carb will support enough fuel and air for 650CFM. After some experience and looking around you will see that 450-500 CFM will yeild around 350hp. More important than that is if you know that the stock turbine will flow 300cfm at 1kilo of boost and that the compressor upgrade will flow 450cfm 1kilo then you know the uprgrade flows more air.
More air requires more fuel to keep from running lean and blowing the motor. Your 4 550cc injectors lack the capacity to support more than 300hp. 300 is really pushing the envelope and using a stock computer does not even allow you to tap into those injectors real potential so therefore using a boost setting of 12psi as a refrence you should not boost more than 12 psi without running a risk of damaging your engine.
There are a number of reasons you can blow your motor........I am the master of blowing 13b's and have blown 6 engines in one year before.. from that I have learned that you can get by doing lots of stuff and the car will run good and be fast for a while, then one day when the temperature drops outside or humidity is just right or your fuel pump skips a beat or whatever.......... it will blow. Everyone on the forum will give you advice on the safe side of tuning aka too much fuel, conservative timing and low boost levels. You can use that advice as a guideline to build your own car and try stuff that narrows on the extreme but the more you try the more chance of damaging your engine and spending even more money to fix it. If you don't mind popping a motor or two on your learning curve then go ahead and play and learn, if not then follow along and build a respectably fast car that will last a long time.
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