17 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHI found this in my car
Leading reported evidence
Use launch master or rev limiter
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
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1
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Read evidence and context
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Performed · outcome unconfirmed
These are typically used for a Launch Master or Rev Limiter.
Leading evidence: 'Use launch master or rev limiter' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Set multimeter' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
Set your multimeter for resistance so it will buzz/chime when the circuit closes.
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Suggestion
If you find it, you can easily test this with a buzzer/multimeter/test probe and do a run and see at what rpm's it goes off.
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Suggestion
So by plugging in the pill in the "On" position, this would either turn on either a rev limiter or a RPM based signal switch that could be used for things like a shift light.
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Suggestion
So by plugging in the pill in the "On" position, this would either turn on either a rev limiter or a RPM based signal switch that could be used for things like a shift light.
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17 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T165820Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Good thursday morning, I was taking my baby for it's first spin after some major engine work and found this in the rear tray area.
PO had this bolted under the metal plate. Any ideas what it is?
Thanks
I would guess it is an MSD 2 Step Module Selector:
https://www.msdperformance.com/produ...ols/parts/8739
These are typically used for a Launch Master or Rev Limiter.
allright, allright, I posted them on Rentech with the startup video, but here you go.
Not a rebuilt though, just some top end chain guide refresh and few more bits and pieces.
Ding ding ding. This is the old school version when they had pills instead of a ****.
Better check to see how many type2 over-revs are stored in case that is the reason why he got it.
This is just a guess since I can't really examine your system up close. The "Off" slot maybe either hooked up to nothing and act just as a holder for the MSD pill or it can be hooked up to a two stage MSD rev limiter or rpm sensing module for things like a shift light. Usually the later pills offered by MSD was white and had a RPM identifier printed on it. I'm wondering if you got one of the really old ones before they came out with the white pills.
So by plugging in the pill in the "On" position, this would either turn on either a rev limiter or a RPM based signal switch that could be used for things like a shift light.
Once again this is just a guess based on the one pic.
Thanks alpine, but I was more wandering for the purpose of it.
Let's say the rev limiter, what would be the purpose? To launch like a dragster? This is no dragster here, plane jane 996 3.4.
Shift light? The whole idea of this module would be to light up a light in the dash? Sounds like lot's of haslle, as the installation seemd pretty neat, first time i actually notice there is something that is not stock.
I will investigate those wires go one day.
Thanks for help everybody!
I'm guessing it would lean more to the side of a shift light the PO might've removed before selling the car. The type of shift light I was thinking of is the external type usually mounted on the corner of the dash, on top of steering column, or mounted on the A pillar. Do you notice any mounting holes or holes that were drilled anywhere?
It would be more difficult to control rev limit as these cars have individual coilpacks.
I much preffer the shift light idea
No mounting holes, full leather interior, pretty clean.
But hey, so much for no history and few POs before myself according to CarFax, wish there would be a way to dig some more into history. I'm not much of a detective though
If that's a window trigger switch, you could use it for anything to enable or disable a circuit based on RPM.
The RPM-Activated Switch, PN 8950, has two activation wires; one to ground a circuit and the other to open a circuit. Simply plug in an rpm module and wire the Switch to the circuit you want to activate. When the engine rpm reaches that amount, the circuit is activated and will remain on until the rpm falls below that amount.
One common (but I don't know how common for 996) application for a window switch is as part of a nitrous setup. The window switch can be used to ensure that the bottle solenoid will only work above X RPM. This is a nice addition to a system that employs a throttle position sensor - only when the throttle is at 100%
and
the RPMs are suitably high will the solenoid open (Nitrous @ full throttle and low RPM often = BOOM. The YouTube nitrous fail videos where part of the intake manifold gets launched into the stratosphere illustrate what can happen when the intake fills up with nitrous (or nitrous + fuel) while the engine isn't gulping air)...
Trace the wires in the back and it should eventually terminate to two leads +12v and negative. If you find it, you can easily test this with a buzzer/multimeter/test probe and do a run and see at what rpm's it goes off.
Oh. now you sound a bell, I remmember finding a plug in my engine compartement, just lying on the right side, near O2 sensors and posting here asking what it was, maybe this is where it leads to!
Thanks alpine, much of help
Hmmm, that's a weird place if that's where the wire goes to. In that location, I wonder if he used it for a PSE type device to activate the loud mode on a valve actuated mufflers. hmmm....
This is a source reference. Confirm exact model applicability in the original material.
