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Join Date: Dec 2005
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what is this,, it gets very hot
 This loos like some type of ballast resistor that sits in with the DME and KlR. I have noticed that it gets very hot. Too much for my taste is this normal?? What is it's purpose? thanks
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Sid splitting my obsessions with a crow bar. 87 DD Black 951 Holset HX40-35 custom garrett turbine, Ford MAF, Rogue tuned,SLM stroker, best ET 11.4..best mph 127 |
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08-03-2007, 07:34 AM
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Ornery Bastard
Join Date: Sep 2001
Location: South Sound
Posts: 2,879
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Is that photo of the DME mounting board? If so, then whatever that is, it's a hack-job by a previous owner.
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--------- Silver 1998 Volvo S70 T5 <- Daily (Anja) Guards Red 1986 951 <- Seattle car (Gretchen) White 1976 914 2.0 F.I. <- Prodigal car, traded away then brought back again (Lorelei) |
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08-03-2007, 08:38 AM
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Yea actually they aren't mounted at all. I will make a nice alum mounting brace for them.
Do you know what this is?
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Sid splitting my obsessions with a crow bar. 87 DD Black 951 Holset HX40-35 custom garrett turbine, Ford MAF, Rogue tuned,SLM stroker, best ET 11.4..best mph 127 |
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08-03-2007, 09:24 AM
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cold starter
Join Date: Aug 2004
Location: Edmonton AB
Posts: 278
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Without knowing exactly what wires are in there, I would guess that the PO of your car upped the size of the injectors and used low impedance ones. Without those resistors, the injector drivers see all that heat and then burn out the DME.
Again just guessing because I use ballast resistors with my 55lb injectors.
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88 Turbo S Silver rose: Megasquirted fuel, assorted suspension upgrades, etc. 89 944 S2 with 968 engine: Race car 87 944: Chump car build in progress |
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08-03-2007, 10:23 AM
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That was my initial thought but these are much larger wires than the injector wires.
I'll try to get a better photo of it.
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Sid splitting my obsessions with a crow bar. 87 DD Black 951 Holset HX40-35 custom garrett turbine, Ford MAF, Rogue tuned,SLM stroker, best ET 11.4..best mph 127 |
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08-03-2007, 10:32 AM
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Also I ran the bosch # and they are the porsche 42 # injectors so I kinda ruled that out right away.
I had done an OHM reading on the injectors and they are about 5. not the 2.4 of the std low impedance style
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Sid splitting my obsessions with a crow bar. 87 DD Black 951 Holset HX40-35 custom garrett turbine, Ford MAF, Rogue tuned,SLM stroker, best ET 11.4..best mph 127 |
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08-03-2007, 10:33 AM
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Ohm the ends on them to the Injectors and see if they lead there.
Sox
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"Little problems always come back and bring bigger friends with them". 1986 951"MADDOG" black Dual port WG, 4 port control valve with EBC |
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08-03-2007, 05:30 PM
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I'll try that, but it really doesn't look like these go to the injectors or anything related to the dme.
They were initially up above the dme and KLR. Is there something else that requires this type of resistor. Heater,, alarm??
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Sid splitting my obsessions with a crow bar. 87 DD Black 951 Holset HX40-35 custom garrett turbine, Ford MAF, Rogue tuned,SLM stroker, best ET 11.4..best mph 127 |
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08-04-2007, 12:17 AM
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Well there are resistors for the speed of the vent fan iirc..
Sox
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"Little problems always come back and bring bigger friends with them". 1986 951"MADDOG" black Dual port WG, 4 port control valve with EBC |
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08-04-2007, 08:15 AM
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winter-hater club member
Join Date: Oct 2003
Location: salt lake city, utah
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Quote:
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2000 Corvette - ????, 2007 Buell XB9R - Astrid, 1996 Discovery - Piglet, 2000 Forester "COOL PRIUS!" - Nobody Ever |
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08-04-2007, 09:16 AM
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Location: Napa Valley, CA
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I have these in my car too, I too am curious to their purpose.
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Keith 1986 Porsche 951 |
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08-16-2007, 10:59 PM
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911 Abuser
Join Date: Aug 2007
Location: Sweden, Övik
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Ballast resistors for a high power ignition coil?
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08-18-2007, 12:31 AM
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Got Turbo?
Join Date: Jun 2002
Location: Valley of the Sun
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These are the resistors for the blower motor. They control the speed(s) of your fan.
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Vic Timpauer - www.pauertuning.com Mesa, AZ 944 Turbo S - Plug & Play Vi-PEC V44 EMS, GT3076R DynaPack Dyno: 358whp/352lbft @ 18.5 psi 91 pump 438whp/430lbft @ 22.5 psi E85 |
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08-18-2007, 09:06 AM
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Location: Rochester, NY
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Aren't those the resistors for the radiator cooling fans? I know on the earlier cars they were mounted under the dash, on the late they are mounted next to the battery. I have an '88, they are located by the battery, and look just like that.
The blower motor for the heater/ac has it's own resistor inside the blower motor cover. It's long and skinny and a lot smaller than the ones pictured. Again, my info is based on the way my '88 is set up so I can't be 100% sure about yours. Here are the radiator cooling fans resistors on my car: 
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08-19-2007, 12:37 PM
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Thats them thanks.
PO must have routed them inside?
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Sid splitting my obsessions with a crow bar. 87 DD Black 951 Holset HX40-35 custom garrett turbine, Ford MAF, Rogue tuned,SLM stroker, best ET 11.4..best mph 127 |
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08-20-2007, 07:19 AM
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The wires on mine were seriously crumbling away so I replaced a few inches of them along with all new connectors. However I broke one of the small plastic things next to one of the resistors. What is it? Can I run without it like the late style car above?
The late car in this picture has them. I'm confused. Wiring Question Heres mine 
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Keith 1986 Porsche 951 Last edited by Keithr726; 04-28-2008 at 10:23 PM.. |
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04-28-2008, 10:21 PM
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Location: Northern NJ
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They're cooling fan resistors. Best bet is to find some used. Try 944 ecology or parts heaven.
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-Chris '86 951 (daily driver with occasional DE) Mods: A few. |
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04-30-2008, 06:33 PM
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As far as I can tell on the 86' year there are two 0.92 ohm bulk resistors. I do not see the extra piece. This may be a owner "special" ??
Sox
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"Little problems always come back and bring bigger friends with them". 1986 951"MADDOG" black Dual port WG, 4 port control valve with EBC |
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04-30-2008, 08:23 PM
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