This is simple mathmatics. Lets break down what we know.
We know he had 7.5 PSI of boost.
we know he used 330cc injectors according to the datasheet picture of when they were flow tested. to convert CC's to Lbs/hr, you divide by 10.5. so,
330 / 10.5 = 31.428lbs/hr.
now the ONLY reconized gasoline fuel equation in the whole wide world is as follows....
HP = (Flow rate x # of injectors x Duty cycle) / BSFC
another way of saying the same thing is....
Flow Rate = (HP x BSFC) / (# of injectors x Duty cycle)
So, since all power production MUST come from the total amount of fuel injected into the engine, and gasoline has a known energy content, there is
absolutely NO lee-way in this portion of the discussion. The ONLY way for the HP numbers claimed to have actually occured is # 1. Inertia Dyno sweep
tests are fraudulent. OR #2 His engines BSFC must be so low, its beyond reason, becuase even the best motors in the world cannot come close to
these levels. I'll get more into that later.
We also know he had a 1:1 Ratio FPR. So, even though his fuel pressure raised 7.5 PSI above normal, there was also 7.5 PSI in the manifold, cuasing
the differential pressure to remain unchanged. 50 PSI is normal WOT rail pressure.
BSFC, is Brake Specific Fuel Consumption. This number is just a way of totalizing the amount of fuel you inject vs. the amount of HP you get out. It
refers to the engines efficiency in developing power. Most every production production vehicle on the market has around a .5xx BSFC. When you add a
turbo or supercharger to an engine, your BSFC goes UP. this is becuase the power to drive the turbo or SC has to come from the fuel. so, the engine
will use more fuel than a N/A motor to make power, becuase it has to also power your F/I method. So, a typical F/I car will be HIGHER BSFC than an
equivalent N/A model.
BSFC can be made to go lower. this is through raising your compression ratio. Diesel engines are some of the worlds highest compression engines, so
high, they auto-ignite the fuel. they only have a BSFC of .4xx
So, our argument is that either his car has an extremely low BSFC rate, or the dyno had to much human error in the programming of a machine thats
doing something its not really designed to be doing in the first place. hmmm, this is gonna be hard.
Lets do the math now.
HP= 297 to the wheels according to the claim. with an automatic trans, there has to be at least a 20% drive line loss. so, to convert to Crank HP, 297 x
120% = 356 HP at the crankshaft.
In order for that to be true, and for the 330cc's running at 100% duty cycle to be true, the only other item that can be flexible in the equation is BSFC.
356= (31.428 x 4 x .999) / BSFC
356= 125.586 / BSFC
BSFC = .352
This is an impossibility. I challenge any one to show me another example of a car with some remotely close. Not from this site, there seems to be
epidemic BSFC engines here. Show me another engine even close thats forced induction, and i'll eat my words.
heres what i think... the dyno is wrong. heres what i think his power should be...
HP= (31.428 X 4 X .999) / .520
HP= 125.586 / .520
HP= 241.51
WHP= 193.2
another little formula i know for figuring out HP from boost...
(PSI + 14.7) / 14.7 X STOCK HP = NEW HP
(7.5 + 14.7) / 14.7 X 160= NEW HP
22.2 / 14.7 X 160 = NEW HP
1.51 X 160 = NEW HP
NEW HP = 241.63
WHP= 193.3
hmmm, 241FHP / 193WHP ... isnt that the same result from my guess above????
wow, so now everything is in line, i say the probability that his engine is .352 BSFC is not likely at any stretch of the imagination. Did the dyno operator fudge his numbers? Thats a much more believeable explaination of what going on here.
Its also looking like these injectors are capable of 240 HP, and thats where he stopped increasing boost, at the 240HP level. this is where he would have just flat run out of fuel if he went any higher.
alright promotec, prove that wrong with something other than your good name, or "opening my mind", and i'll be glad to hear you out. if you just gonna ask about what my car has done , or whatever other crap you can come up with to deflect the issue, dont bother.
M90'd Built LGO-15 PSI
http://webstarts.com/quadper4mance
