I realize this is not ideal but what about adding an additional relay or driver circuit to handle these other solenoids?
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I realize this is not ideal but what about adding an additional relay or driver circuit to handle these other solenoids?
[/GEEK ON]Quote:
Originally Posted by 99 vr4
Don't forget about inrush current when the solenoid is energized and back-EMF when the soldenoid is de-energized. What can the 98/99 ECU handle for those?
[/GEEK OFF]
[GEEK MODE]
The ECU is designed with diodes in place for inrush current and back EMF. The ECU is already equipped to handle the normal solenoids without any external protection. Wiring a relay in place to then control the higher draw solenoid is actually a bad idea. For instance, the BCS uses a duty cycle. This duty cycle (I can't remember the frequency range) is how the ECU can control the boost. Most relays are not so good for that. Relays like to be on or off, not switched on and off 100 times a second (100Hz). That being said, it is possible to then drive another transistor with the appropriate protection circuitry external to the ECU. But costs, complexity, and the fact that you now have additional circuits which can not only fail but add to the delay in activation render this solution not ideal.
I would recommend that you go back to the 5 watt resistor idea. This would at least limit the amount of current the ECU sees, is inexpensive, and since it is a passive component should not add any delay to the circuit.
In the end the GM BCS might be the best three port solution. Lets just see what the coil resistance and current draw are when I finally get it.
[/GEEK MODE]
GM/Delco BCS, part # 1997152
coil 24.2 ohm
volts / amps
12.0 / .50
12.5 / .51
13.0 / .52
13.5 / .54
Resistance measured with Fluke multimeter
V / A are just the amp readings displayed on my CV/CC power supply (in CV mode) at the specified voltages.
Enjoy,
James
Don't know if anyone has seen this while looking at the evoscan website but they're developing evoscan for android and iOs. Seems like it requires either Bluetooth or a USB cable but that will be incredibly convenient if we can use it to log without a computer.
http://www.evoscan.com/android-evox-can-obdii
that would be handy, but the tactrix cable can do standalone logging. Since you can't run ecuflash on the phones you need a computer to make any changes anyway.Quote:
Originally Posted by Goallie11
James thank you.... I guess I will pick up a resistor for testing..Quote:
Originally Posted by james92tsi
Tenet mitsu used an absolute ceiling of 14.4 volts for their design...
No problem Brett! A couple more data points to get you up to 14.4V:Quote:
Originally Posted by 99 vr4
volts / amps
14.0 / .56
14.4 / .58
James
True, but you'd be able to review logs while in the car and moving. For instance if you have a laptop with incredibly shitty battery life like mine it'd be useful.Quote:
Originally Posted by Forest Gump
So we're looking at 3 options so far for aftermarket bcs then.Quote:
Originally Posted by james92tsi
GM 3-Port BCS at 24.2ohms (read 25ohms on evolutionm), but let's go with 24.2 for safety sake:
~12ohm 5watt resistor
Grimmspeed 3-Port BCS at 32 ohms:
~ 4-10ohm 5 watt resistor
Evolution X Stock BCS at 29 - 36 ohms:
~ 10ohm 5 watt resistor