A Little Tach Vodoo on my 87 S4
08-30-2006, 05:34 PM
#1
Racer
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A Little Tach Vodoo on my 87 S4
The 86 1/2 and newer 928's have dual distributors, so when you want to add a tach device for an 8 cylinder, the output actually sends 4 cylinder information (the 928 Tach is a 4 cylinder tach). In my Chevy engined 928 this was a problem... as the reading would be double. Enter a new $80.00 device from Dakota Digital. I ordered a SGI-8 Tach Signal Calibrator from them (www.dakotadigital.com) which solved the problem... this device allows a large variety of inputs and outputs.
Another part of the Vodoo is that it must be some sort of secret exactly what wire is the one that connects the tach, as it's taken 2 years to figure this one out, and Renegade was no help. This morning after 4 hours of experimenting ($$$) my mechanic found the white and blue wire under teh dash was the tach lead. Now you'll know two of the longest running secrets out - the DaVinci Code and what wire is the tach lead.
Another part of the Vodoo is that it must be some sort of secret exactly what wire is the one that connects the tach, as it's taken 2 years to figure this one out, and Renegade was no help. This morning after 4 hours of experimenting ($$$) my mechanic found the white and blue wire under teh dash was the tach lead. Now you'll know two of the longest running secrets out - the DaVinci Code and what wire is the tach lead.
08-30-2006, 05:48 PM
#2
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When I installed the 84 Euro S engine in my 1980 928, the tach would read 1/2 actual RPM's. 84-85 Euro S engines also have a dual distributor. Kinda strange to have to think of 3000rpm as redline. I sent my tach to Palo Alto Speedometer, they re-calibrated it to double the signal being received.
Rich
Rich
09-02-2006, 05:33 AM
#6
Drifting
heres a pic of the tacho i am using, i ordered it in 8 cylinder configuration only to find like you guys that the signal is for a 4 cylinder.. had to send it back and have it recalibrated.
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09-04-2006, 04:07 AM
#8
Drifting
i hope thats a note of approval, i love the compressed scale 0-2000 and white needles of these racetech gauges
the guys at raceparts uk who make them were really helpful, re-calibrating from 8 to 4 cylinder and posting it back out to me for no cost. its one of the few tachos that only read to 7k, most go to 8k and you dont need the extra thousand in a stock 928 so you loose some of the sweep.
the guys at raceparts uk who make them were really helpful, re-calibrating from 8 to 4 cylinder and posting it back out to me for no cost. its one of the few tachos that only read to 7k, most go to 8k and you dont need the extra thousand in a stock 928 so you loose some of the sweep.
09-04-2006, 07:41 AM
#9
Three Wheelin'
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Hi Nick
As you know I have seen your amazing dash....the only problem I think is if the car ever gets broken into ...I have a nasty feeling they will steal your custom dash lol....now where did you say you parked it ?? hmmm..lol
All the best Brett
As you know I have seen your amazing dash....the only problem I think is if the car ever gets broken into ...I have a nasty feeling they will steal your custom dash lol
....now where did you say you parked it ?? hmmm..lol All the best Brett
