- Mar 2, 2017
- Reaction score
- Members Ride
- VZ SS Ute
Not as I read it. (see below.) He purchased the 16V alternator and battery but did not run the alternator n the testing. Baseline was a standard alternator at 14V. 6hp drop with fully charged 12V battery no alternator so it is operating at 12V and below from the start. Then other 6hp loss with a 12V battery at 3/4 charge and no alternator then a 16V battery with no alternator.added 6hp over baseline.The example shows the detriment of voltage drop in a standard 12 volt system.
What the OP indicated is that with a standard 12V system in a race car at the end of the race the battery is not fully charged and the VD is detrimental to performance. If the alternator is not producing enough charge to maintain the battery in race conditions it is not sized correctly for the task - power demand exceeds output. If he increases the alternator size to combat this it will come at the cost of reduced hp to drive it. (no free power). Interesting 3/4 of 16V is 12V - the magic number to drive the components.
In race applications there are other electrcial systems that can be used - total loss systems , magnetos etc. It is not really a comparable scenario to a six banger commodore or an LS1 on a skid pan.
I'm not saying increasing the voltage can't be benficial - especially in a race/performance situation. I am simply trying to ascertain what benefit this provides to joe average and if it is worth investing the time and effort.
Thanks everyone, I have purchased a powermaster race 16v alternator so all good. Smitty, I did a thorough dyno session with a super sedan engine a while back, baseline was with the dyno battery and alternator around 14v. Then tested with a fully charged 12v battery and no alternator, lost about 5-6 hp. Then a 3/4 charged 12v battery no alternator, lost another 5-6 hp, this test simulated what the output would be at the end of a race. Then a fully charged 16v race battery, no alternator, picked up 6 hp over the 12v with alternator combo.
This was with MSD ignition and simulated race set up how it is raced with no alternator. I am going this way for my own drag car and 6 hp is 6 hp, I am picky with things like that.