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930 3,3

Hello to you. I hope you can help me. On my 930 3.3 1978 there is this feeling which is not connected what does it mean for my engine and what can I do to connect it??


Regards John.
Old 12-05-2009, 10:12 AM
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Overboost sensor.
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Old 12-05-2009, 10:13 AM
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You can run with out it connected just don't stay on boost to long, short boost.
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Old 12-05-2009, 10:16 AM
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Where should it be connected? will damage the engine??

sincerely, john.
Old 12-05-2009, 10:38 AM
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There should be a single lead wire coming out of your engine's wiring harness. I bet it was just not hooked back up, or accidentally pulled off at some point in time. If you look around, I'll bet you'll find the loose connector hiding somewhere in or around you intake.
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Old 12-05-2009, 10:46 AM
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Ok I am looking after. But the engine can be detrimental if I run without it connected?

sincerely, john
Old 12-05-2009, 10:55 AM
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Just do not stay in boost for long periods of time. Even a 3ldz turbo can get you over 1 bar of boost, if just the wrong conditions occur.
I wish I had a wiring diagram to give you, maybe someone else will chime in and send you a link or something.
Best of luck with your engine compartment search!
Mark
Old 12-05-2009, 11:00 AM
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Running your engine with the overboost sensor disconnected with not do anything - litterally. The overboost switch is a safety device that will shut down the fuel pumps should your boost hit >1.1bar. Stock boost is set for 0.75 bar so this should never happen in a healthy car.
You decide if it is worth connecting.

EDIT - you can see the connector hiding just left and down from the switch in your picture. It has a black spade. Plug it in.
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Last edited by RarlyL8; 12-05-2009 at 12:42 PM..
Old 12-05-2009, 12:39 PM
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The wire is white and most likely is plugged elsewhere as a ground. The job of the over boost is to shut down the fuel pumps if needed. Without the wire being connected to either the switch or a makeshift ground the car will not run. I would hook it back up to the switch, just for safety.
Old 12-05-2009, 12:42 PM
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'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
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Old 12-05-2009, 12:46 PM
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you don't miss a thing, do you :-)
Old 12-05-2009, 12:55 PM
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Ok I move the cable to the back, but why has picked former owner of the cable.? It seems pointless


regards. john.
Old 12-05-2009, 01:07 PM
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Many thanks for your help.

sincerely, john.
Old 12-05-2009, 02:00 PM
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might be that the sensor is going bad, i just had to replace mine, it give you the nice "dash in face" syndrome when it kicks in...

Quote stolen from another member (who has posted in this thread!) but is exactly as it sounds...
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Old 12-05-2009, 02:02 PM
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WOW Brian, what an eye... how old are you?
Old 12-05-2009, 02:11 PM
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Someone probably forgot to plug it in after working on the car.
I've never done that of course.
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Old 12-05-2009, 04:55 PM
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Smile

he he. Expert is in
Old 12-06-2009, 09:34 AM
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Looks like someone installed a brass male spade terminal under one of the blow off valve end cover nuts so they could push the factory female spade terminal on there grounding it to bypass the overboost sensor.
Look closely, you can see it.

I did the same thing on mine when when I was still running a shortneck intercooler and the origonal blow off housing because the origonal overboost sending unit was worn out and oversensitive and would sometimes disconnect the ground to that wire shutting off the fuel pumps around 9.5bar.

I mounted a male spade terminal like that on the rear support bracket next to the overboost sensor on my longneck intercooler too and it's good to have as a backup if the sensor goes bad.
Old 12-06-2009, 09:49 AM
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It is really seen. should I switch sensor maybe?

perhaps measuring it through?
Old 12-06-2009, 10:08 AM
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Check your current boost level.

That is usually done with a stronger Wast-Gate Spring. If it is not there now, the previous owner most likely had the boost pumped up at one time and had to override the over-boost safety to keep it from killing the motor on boost.
Old 12-06-2009, 12:03 PM
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