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1979 930 @outlaw3.4
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where the electrical wizards at - tach /gauge issue
I have 79 930 with CIS / bosch twinplug CDI.....recently intalled innovate motorsport MTS guages and the BL RPM switch /solenoid.
The gauges are all working as intended and I am logging AFR, Boost, RPM, Oil Temp, Voltage, Fuel Pressure on a PL1 and charing on Logworks 3. the other day I wired up the RPM Switch and set the solenoid toopn at 4000RPM. I logged some easy driving, went to Log works tochart myfuel pressure / AFRs /boost and RPM.....everything was was recorded but the RPM channel is gone now. iam thinking ithas to be related. The Innovate RPM gaauge takes the signal off the black / voliolet wire behind tach. I can see the wire still has voltage. tach is working, RPM Solenoid is working Innovate RPM channel not working. I am going to disconnect the RPM solenoid and see if I get the RPM channel back. Does this make sense to anyone?' Do I need amplify the pulse to the RPM channel if I am adding the MSD RPM switch ? Adding a 10K 1/2 watt resistor was suggested by innovate...seems easy enough...but they are not familliar CDI / MSD / enough to know for sure.... check out the guages on @outlaw34 in IG if you are thinking about doing same. Happy to help....ifI could do it any one can!
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1979 930 3.4l Peter Dawe Motor, Bosch Twin Plug, Dual Bosch CDI, J&S Ignition Control, Webcam 158 , Maxed Flowtech Fuel Head, BL Adj WUR, Braided Fuel Lines, 009 Injectors, GT35R, TIAL .7with Turbosmart MBC, Fabspeed Long Neck IC, Fabspeed Headers, GT3 Style Pipe off turbo, Rennshift Short Shift, KEP Clutch Package, 8.41, Elephant Racing Suspension, Weltmeister Sway Bars, ??WHP, Innovate MTS Gauges, RPM, Switch,SplitSecondAIC 7th |
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03-15-2022, 06:59 AM
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1979 930 @outlaw3.4
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I disconnected the MSD switch. Now the logger sees the RPM signaland the TACH works.
so that leaves me with A. RPM Switch Box is defective ? but it does work as it is suppose B. The tach wire can not drive tach, MSD and gauge. I did notice the volatage went from 1.8v to 2.4v at tach when I discconnected the MSD from the tach wire.
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1979 930 3.4l Peter Dawe Motor, Bosch Twin Plug, Dual Bosch CDI, J&S Ignition Control, Webcam 158 , Maxed Flowtech Fuel Head, BL Adj WUR, Braided Fuel Lines, 009 Injectors, GT35R, TIAL .7with Turbosmart MBC, Fabspeed Long Neck IC, Fabspeed Headers, GT3 Style Pipe off turbo, Rennshift Short Shift, KEP Clutch Package, 8.41, Elephant Racing Suspension, Weltmeister Sway Bars, ??WHP, Innovate MTS Gauges, RPM, Switch,SplitSecondAIC 7th |
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03-15-2022, 11:07 AM
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Registered
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I have no idea - waaay out of my scope.
But.... I did try running three tach functions off the tach wire and it did not work. I suspect your B option may be a possibility. It is not a strong signal. I had to fit a Tach Adapt to improve the signal. I then tried running a 2nd tach adapt for another function - nope - the system fell over. Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-) |
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03-15-2022, 12:27 PM
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1979 930 @outlaw3.4
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Quote:
 )
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1979 930 3.4l Peter Dawe Motor, Bosch Twin Plug, Dual Bosch CDI, J&S Ignition Control, Webcam 158 , Maxed Flowtech Fuel Head, BL Adj WUR, Braided Fuel Lines, 009 Injectors, GT35R, TIAL .7with Turbosmart MBC, Fabspeed Long Neck IC, Fabspeed Headers, GT3 Style Pipe off turbo, Rennshift Short Shift, KEP Clutch Package, 8.41, Elephant Racing Suspension, Weltmeister Sway Bars, ??WHP, Innovate MTS Gauges, RPM, Switch,SplitSecondAIC 7th |
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03-15-2022, 08:16 PM
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1979 930 @outlaw3.4
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Holley/ MSD no help- innovate no Help J&S always helpful!!
Looks like Imay have afew options to pull a tachsignal soIdont over tax one....
2 CDI boxes each has tach signal out J&S Safeguard also has a 12v square wave tach out put. Its the yellow wire in pin 3 of the connector and the output transistor is a 100v mosfet with a120 ohm 12v pull-up resistor. ( ihave zero idea what that means but hopefully its the ticket... The innovate requires a 0-5v tach signal and worked when spliced into the black and violet tach wire off the CDI.
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1979 930 3.4l Peter Dawe Motor, Bosch Twin Plug, Dual Bosch CDI, J&S Ignition Control, Webcam 158 , Maxed Flowtech Fuel Head, BL Adj WUR, Braided Fuel Lines, 009 Injectors, GT35R, TIAL .7with Turbosmart MBC, Fabspeed Long Neck IC, Fabspeed Headers, GT3 Style Pipe off turbo, Rennshift Short Shift, KEP Clutch Package, 8.41, Elephant Racing Suspension, Weltmeister Sway Bars, ??WHP, Innovate MTS Gauges, RPM, Switch,SplitSecondAIC 7th |
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03-16-2022, 07:43 AM
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1979 930 @outlaw3.4
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i spliced into the J&S yellow wire pin 3 and it worked like a charm.
MSDgetting trigger from CDI
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1979 930 3.4l Peter Dawe Motor, Bosch Twin Plug, Dual Bosch CDI, J&S Ignition Control, Webcam 158 , Maxed Flowtech Fuel Head, BL Adj WUR, Braided Fuel Lines, 009 Injectors, GT35R, TIAL .7with Turbosmart MBC, Fabspeed Long Neck IC, Fabspeed Headers, GT3 Style Pipe off turbo, Rennshift Short Shift, KEP Clutch Package, 8.41, Elephant Racing Suspension, Weltmeister Sway Bars, ??WHP, Innovate MTS Gauges, RPM, Switch,SplitSecondAIC 7th |
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03-16-2022, 07:12 PM
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Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,335
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"B"
it could be with all connected the impedance has dropped and the CD cant drive all of them.
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86 930 94kmiles [_ _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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03-17-2022, 07:38 AM
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