Quote:
Originally Posted by Robin Lawrence
You didn't clarify your estimated amp draw on your car. I had a conversation with Larry Hill about this very subject late last year.
If you're running a carburetor with a stock type coil you can get away with a lot less.
I run an EFI system that uses wide band 02 sensors in each primary for data and 2 more in the collectors for the EFI system. Add a EFI High Pressure fuel pump, Large Cooling Fan, electric water pump, 2 Digital Dashes and a Race Pak the little items add way up.
Last car we logged years ago didn't have the Race Pak, 02's on primaries or digital dashes. I was drawing 60 to 65 amps during a chassis dyno run.
Since I was at Holley when I built this car I opted for the MSD 5361 160 amp alternator.
Fuel injection loves Voltage. I also have 2 Optima Red Tops that have worked well. Most times after a run the batteries state of charge is at 95% unless I run the fan and water pump in the pits to cool down.
I think that you cannot go wrong by having too much capacity.
Good luck!
Robin
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Last summer while on the dyno (down at Gales) we had an unexpected 10 HP drop out of nowhere. Looking at comparison data it looked identical.... except Tony had forgot to turn the charger back on in the dyno room. The voltage had fallen to 11.5 volts during the pull. This was an L-98. That dyno room has a 7AL2 for ignition juice. Turned the charger back on and we instantly was back to normal power levels.