ELECTRONIC SUPERCHARGER?????
03-04-2007, 02:33 PM
#18
Rennlist Member
It's pretty simple math. The battery can handle quite a bit of amperate. heck, my little 14amp-hour battery can handle 500amps, but not for very long 
So, you could use 60amps for 60 to 100mph over 6-7 seconds and then during the decel time or anytime you are not WOT, the battery is recharged by the alternator at some rate. the battery is changed based on voltage drop. If the voltage drop based on current requirements exceeds the limits of the ECU, the car may run poorly, but this usually happens under 10volts. to drop the voltage of a battery to under 10volts, you need a pretty hefty current draw.
so, generally, 60-100amps with a properly functioning alternator, is not an isse. there is no voltage drop as we have measured voltage in the 14volts on a BMW 328 with the eRAM running 60amps. (pics of this on the website and ebay ad) . With some brushelss prototypes of 200amps, we have seen the voltage drop to near 11volts, still not a big deal, for short duration operation.
mk
So, you could use 60amps for 60 to 100mph over 6-7 seconds and then during the decel time or anytime you are not WOT, the battery is recharged by the alternator at some rate. the battery is changed based on voltage drop. If the voltage drop based on current requirements exceeds the limits of the ECU, the car may run poorly, but this usually happens under 10volts. to drop the voltage of a battery to under 10volts, you need a pretty hefty current draw.
so, generally, 60-100amps with a properly functioning alternator, is not an isse. there is no voltage drop as we have measured voltage in the 14volts on a BMW 328 with the eRAM running 60amps. (pics of this on the website and ebay ad) . With some brushelss prototypes of 200amps, we have seen the voltage drop to near 11volts, still not a big deal, for short duration operation.
mk
Originally Posted by Bret928
Looks neat. Website seems to have a lot of interesting information. But to do it right - isn't there a concern about amperage?
03-05-2007, 02:25 AM
#20
Rennlist Member
bronto, OB's tend to be at WOT more of the time than S4's, IMHO... and I'm not sure the charging system is up to too much of that kind of service. Address that issue though, also seal up the airbox, and you can probably see that 1psi gain.
