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Registered
Join Date: Jun 2005
Location: Tennessee
Posts: 33
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MSD Rev limit
Just installed a new MSD unit into my 78 911 SC. Also installed the Tach adapter. Car runs real smooth and the tach works find. The problem is the engine will not rev over 4000 rpm. It seems to hit a rev limit. I have changed the rev limit chips from 6000 to 7000 rpm with no change, still 4000 rpm limit.
Any ideas?
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James 1978 911 SC Targa |
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07-31-2005, 06:06 AM
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Still Doin Time
Join Date: Nov 2004
Location: Nokesville, Va.
Posts: 8,225
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Check your wiring.
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'15 Dodge - 'Dango R/T Hauls groceries and Kinda Hauls *ss '07 Jeep SRT-8 - Hauls groceries and Hauls *ss Sold '85 Guards Red Targa - Almost finished after 17 years '95 Road King w/117ci - No time to ride, see above '77 Sportster Pro-Street Drag Bike w/93ci - Sold |
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07-31-2005, 06:07 AM
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Registered
Join Date: Nov 2004
Location: Greater Metropolitan Nimrod, Oregun
Posts: 10,040
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and check the type of and age of the coil
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"A man with his priorities so far out of whack doesn't deserve such a fine automobile." - Ferris Bueller's Day Off |
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07-31-2005, 11:16 AM
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Registered
Join Date: Jun 2005
Location: Tennessee
Posts: 33
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Got that problem taken care of. Removed the tach adapter and everything works find. I guest you really don't need the adapter
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James 1978 911 SC Targa |
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07-31-2005, 12:17 PM
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Registered
Join Date: Dec 1999
Location: TX USA
Posts: 9,804
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JLW,
Can you measure the resistance of that tach adapter with a digital multimeter? Something tells me it is just a pullup resistor ... from the schematics that have been posted!
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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07-31-2005, 01:00 PM
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