battery charging between rounds?

[art leong]

Originally Posted by Mark Yacavone

Art ,I know someone ;-) who had a small limit switch up under the dash on the gas pedal, who had it hooked to a relay that controlled the fan.
As Ed said ,you don't need the fan going down the track, so the fan would be on at all times, even during the burnout, except at WOT.
Another guy ;-) actually incorporated the alternator main feed wire into the same relay.
I know yours truly ,doesn't care to be thinking about a bunch of switches while I'm in the zone..from the burnout box forward.

I don't have my fans run by the ecu. I could it has the oupts for it but I have an old style switch box that turns the fans on I have a remote to turn them on or off under the hood.
The point I was trying to make was the voltage drop when the fans were on slowed the fuel pump down. The ECU is in open loop (Alpha N ) it a a temperature compensation, but the temp was never a problem (till the wire came off the temp sender one pass and it went full rich one time). The ECU doesn't know what my fuel pressure is so it doesn't adjust. The car was on the lean side in a few boxes to begin with This was before I was able to tune it, the dyno guys just tuned for max power and didn't worry much about the rest. I eventually got it straightend out.
On my list for later this season is to tune the car with the alternator switch off. It's a tiny little motor and I'm sure the alternator is sucking up power going down the track.