Running an alternator
 

Do you think running a alternator has any effect on consistency (charging rate changing while racing). Also how much Et do you think it takes if any just been thinking. I've run one for years just never done an A-B-A test with it.

Re: Running an alternator
 

Robbie, I think it is a good idea and provides consistent voltage. If you charge the battery as time allows the alternator load is small. In addition, use pulleys that limit the alternator speed to no more than about 20% overdrive.

Re: Running an alternator
 

Makes more difference with an EFI car. Voltage level effects how fast the injectors open. I found when my 12 volt batteries were a little low, my logger showed it running leaner. That, of course, effects consistency. I had a button under the accelerator pedal, hooked to a relay, that shut the alternator off @ WOT.
Going to two 16 volt batteries cured all that. With no alternator. Had to lean it down with 16 volts batteries. The injectors opened faster, of course.

Re: Running an alternator
 

I run a 16volt battery and the alternator is a16volt . I charge the battery between rounds also I have a 75% reduction pulley on the crank. Just been thinking about the possibility of consistency issues because the alternator may be changing charge rates while racing. Anyone ever trace a consistency issue to running an alternator? Thanks for the response's

Re: Running an alternator
 

I have never run an alternator. I also have a 16 v battery. I have a lithium battery. They are more stable with the voltage over the charging state. The race car does not run enough to charge the battery with the alternator so I don't see any reason to run one. You still have to charge the batteries between rounds so there is no advantage

Re: Running an alternator
 

My kid runs 12 volt stuff, bracket car, lights, dial boards, ect. He runs an alternator and very rarely charges his battery, lots of times double entering the car. So from my perspective I'd say they do a fair job of keeping up with the demand. Car prints tickets so I'd say an alternator does not cause inconsistent E.T.'s. Merely my observations.

Re: Running an alternator
 

Don't you have to run an alternator in Stk?

Re: Running an alternator
 

By NHRA Rules - you need an alternator in Stock -

Re: Running an alternator
 

Yes, it has to be in place, and turning with the engine ;-)

Re: Running an alternator
 

I've used Ed's idea with the micro switch. I also use it to un-ground the fan relay on the run. Not so much as a speed secret, but to keep the voltage consistent during the run.
Does it help? Can't say, but it can't hurt, as long as you charge between rounds.
We are talking about carb'ed combos here.