Injectors
#16
You are running the risk of burning up the injector drivers in your DME. Glad you haven't had issues so far, but you still have the risk.
#17
Rennlist Member
Just to clarify, when injectors with 2.2 to 2.4 ohms are used in instead of the stock 5.5 ohm injectors, the DME output transistors can damage themselves as they try to source up to 2X their rated current at max throttle. Damage to the output transistors may occur at anytime beyond 50% throttle in any gear with these non-stock injectors. Typically, output transistors have the capacity to run at 125 - 150% of rated currents for short intervals, but that all depends on the margin designed into the circuit by BOSCH.
#18
Just to clarify, when injectors with 2.2 to 2.4 ohms are used in instead of the stock 5.5 ohm injectors, the DME output transistors can damage themselves as they try to source up to 2X their rated current at max throttle. Damage to the output transistors may occur at anytime beyond 50% throttle in any gear with these non-stock injectors. Typically, output transistors have the capacity to run at 125 - 150% of rated currents for short intervals, but that all depends on the margin designed into the circuit by BOSCH.
#20
Three Wheelin'
Ok I am safe Lindsey Racing 55's 2.8 ohm. Still I rarely see 17 lbs for more than a few seconds before I have to shut it down. I guess that is also the answer to the question. Lindsey Racing injectors
Last edited by schip43; 12-26-2009 at 11:53 PM.
#25
Burning Brakes
Quick Overview for Injector Resistor Installation
Materials:
(2) 1 Ohm, 25 Watt Aluminum Housed Resistors
Aluminum plate or other metal for heat sink
(4) Pop rivits, screws or other fasteners
Soldering iron
Solder
Wire cutter/stripper
Instructions
1. Cut metal to be used as heat sink into a small square (See below)
2. Drill heatsink for resistors, and mount them to the heat sink with desired fasteners
3. Disconnect negative battery cable
3. Locate DME wires 14 and 15 in the DME wiring loam (See pin outs below)
4. Cut wire 14 and strip back a small amount of insulation. Solder half of wire to one side of resistor and then the other half to the other side.
5. Repeat step 4 for wire 15.
6. Neatly put away wiring and injector/heatsink in the passager footwell.
7. All done!
Materials:
(2) 1 Ohm, 25 Watt Aluminum Housed Resistors
Aluminum plate or other metal for heat sink
(4) Pop rivits, screws or other fasteners
Soldering iron
Solder
Wire cutter/stripper
Instructions
1. Cut metal to be used as heat sink into a small square (See below)
2. Drill heatsink for resistors, and mount them to the heat sink with desired fasteners
3. Disconnect negative battery cable
3. Locate DME wires 14 and 15 in the DME wiring loam (See pin outs below)
4. Cut wire 14 and strip back a small amount of insulation. Solder half of wire to one side of resistor and then the other half to the other side.
5. Repeat step 4 for wire 15.
6. Neatly put away wiring and injector/heatsink in the passager footwell.
7. All done!
#26
Three Wheelin'
Found some pictures on this thread. Guess this is old news to those that have been on here for years. It's new to me. It seems that some run them (resistors) some don't. Street use it seems to be ok not to run resistors but some guys track the car w/o resistors.
https://rennlist.com/forums/944-turb...8-siemens.html
https://rennlist.com/forums/944-turb...8-siemens.html
#27
Found some pictures on this thread. Guess this is old news to those that have been on here for years. It's new to me. It seems that some run them (resistors) some don't. Street use it seems to be ok not to run resistors but some guys track the car w/o resistors.
https://rennlist.com/forums/944-turb...8-siemens.html
https://rennlist.com/forums/944-turb...8-siemens.html
#29
Drive-by provocation guy
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I am running 750cc for over 2 years and also no resistors and no issues.