neuromancer said:
Your math is flawed.
If your car has a 30% loss:
130hp/1.30(30%loss)=100whp
Now add 10hp to it:
130hp+10hp/1.30=107.7whp
107.7-100=7.7 Gain
10hp/1.30=7.7
What stays fixed is the loss. So really a 10hp at the engine does in fact equal 7.7whp.
Jay
Your math is flawed too I believe...
I confused myself, I did not mean to use the percentage thing. Also I don't know how you are getting 30% of 130 being 30. 30% of 100 is 30. 30% of 130 is 39... I will try to explain what I meant better...A G-15M-R gearbox in stock trim consumes about 22% of the bhp rating...Giving an average whp rating of just about 100...
The box will not always only consume that 22%, Look at it more like a blower or AC compressor. Those things take a certain amount of power to run. A G-15M-R takes about 29hp to turn...So in fact the drivetrain loss 22% does get smaller with modification made...Making an engine more efficient in creating power will not make the gearbox consume more power. basically look at it like this, as long our factory bhp rating is correct you will loose on average 29hp to the wheels...that 29hp is what is constant, not the drivetrain loss percentage...
The easiest way to see how this holds true is with forced induction...Hi-boost's car is making about 260whp, so figure it is also making about 289bhp...if the car is making that amount of bhp and we where using the theory that the 22% of the total bhp rating is consumed through the drivetrain, that same car would be making only 225whp, a loss of over 60hp (22% of 288.6 is 63.492, a much bigger loss than the 22% of 130 stock...Also that loss is BIGGER than an AWD North American EVO, and everyone knows that AWD systems consume the most power)...You don't loose more power through the drivetrain just by making the engine stronger...If you could some how make 500hp out of the FS and have the same drivetrain, you would not loose 110hp to the wheels...(22% of 500 is 110)...
So with that look at the ECU mod...if the stock P5 is making 101whp and 130bhp, and the mod gives 10hp...It is added to both bhp and whp...140bhp with a drivetrain loss of 29hp yields 111whp
The confusion started back when FWD tuners started saying that a 25-30% loss is normal for a transaxle...And a lot of people figured the 25-30% was always subtracted from the total bhp...It isn't...that number is normal for a stock trim car...and since most modern FWDs came with "similar" bhp numbers from the factory, that generalization was accepted...and since whp is what matters, and the confusion still exists, manufacturers usually put gain numbers with a "whp" right beside them so you know what they are reffering to...
Also this is mostly theories picked up form the SCC Techno babble a few months ago...It is unlikely people will get there engine bench tested to see the actuall flywheel bhp rating, so it is mostly speculation...I am not saying that this is 100% true, I may be 100% wrong, but this theory makes a lot more sense to me...
I am still confusing myself, does this make any more sense??
