|
|
|
|
| Author |
|
|
Registered
Join Date: Apr 2004
Location: Seattle, WA
Posts: 177
|
How to repair Tachometer Dampening
The tach on my 914/6 (conversion) has lost it's dampening. The tach needle is nice and steady as long as the engine rpm is constant. When the rpm changes quickly (such as when gear changes are made), the needle bounces. It takes a few seconds to settle.
I remember reading a thread about adding a resistor to the circuitry to repair the problem. I have searched and searched and can only find reference to bad grounds, voltage regulators and alternators causing the tach to bounce. This tach only bounces when the engine rpm changes quickly. Even though a 3.2 six has been installed in the 914/6, the engine electronics and induction are still "old school" ... 40mm Weber carbs and points, condenser & CDI ignition. The tach is an early 70's 911 model with a 7,200 rpm redline. Can anyone help me out/ Thanks Eddie |
||
06-17-2010, 10:39 AM
|
|
|
Northern Motorhead
|
Eddie,
Save yourself the trouble of possibly causing more damage to your tach and send it out to Hollywood Speedo to have it calibrated and dampened. I think it's in the neighbourhood of $100.00 dollars ... Cheers ! Phil
__________________
Cheers Phil 89 Coupe,Black,95 3.6 engine and the list goes on ... 1983 944 SP2 race car PCA #96 |
||
|
06-17-2010, 02:03 PM
|
|
|
Registered
|
Quote:
Best, Doyle
__________________
Recording Engineer, Administrator and Entrepeneur Designer of Fine Studios, Tube Amplifier Guru 1989 Porsche 911 Carrera Coupe 25th Anniversary Special Edition Middle Georgia |
||
|
06-17-2010, 03:32 PM
|
|
|
Registered
Join Date: Apr 2004
Location: Seattle, WA
Posts: 177
|
I received some info:
A 2200uF capacitor directly across the windings of the tach needle. I will give it a try after a trip to Radio Shack. Cheers Eddie |
||
|
06-18-2010, 07:30 AM
|
|
|
Moderator
Join Date: Dec 2001
Posts: 9,569
|
Quote:
Early VDO Tachometer Guts
__________________
'66 911 #304065 Irischgruen ‘96 993 Carrera 2 Polarsilber '81 R65 Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13) Ex-'88 Carrera (Sold 3/29/02) Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04) Ex-'89 944 Turbo S (Sold 8/21/20) |
||
|
06-18-2010, 08:13 AM
|
|
|
Banned
Join Date: Apr 2004
Location: Portugal
Posts: 1,513
|
Pls keep us posted, as mine acts the same as yours... and I'm far awaaaaaay from Hollywood !
It would be nice if a simple capacitor would solve it. |
||
|
06-18-2010, 08:15 AM
|
|
|
