Darwantae951

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.

bw993

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.

Darwantae951

Thank you for the technical clarification! Good info!

schip43

Uh oh seriously ? I have the data sheets on the injectors, how do I measure the resistance, just an ohm meter across the terminals?

schip43

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

V2Rocket

yup.

schip43

Wait stock resistance is 5.5 ohms? Mine are 2.8 what the hell?!

ramius665

The highest ticket on record in the US is for doing 167 mph OVER the speed limit, doing 242mph in a 75mph zone.

carreracoupe997

This is all very interesting. Can someone give a quick overview of how and where are resistors installed?

Dave951

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!

schip43

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

95ONE

Yep... been beat to death on here.

carreracoupe997

Thanks Dave951!

toddk911

I know Dave L does NOT run resistors on his daily driver.

I am running 750cc for over 2 years and also no resistors and no issues.