C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

L98 Tach filter

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Old Feb 1, 2004 | 01:34 PM
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Default L98 Tach filter

Has anyone ever replaced the "capacitor" looking component (next to Dist) that is connected in-line with the tach? The GM manual shows that it is actually a resistor/capacitor network built in that component. Also, is anyone NOT running it?
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Old Feb 1, 2004 | 01:51 PM
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Default Re: L98 Tach filter (GRX)

I build a replacement because I thought it was causing problems with my tach. You can't buy them from GM anymore, although I just saw them advertised as an aftermarket piece - pretty pricey considering its like $1 worth of parts.
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Old Feb 1, 2004 | 04:06 PM
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Default Re: L98 Tach filter (1MoorTym)

What were the values of the components? Resistance, farads?
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Old Feb 1, 2004 | 04:22 PM
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Default Re: L98 Tach filter (GRX)

I bypassed mine in order for Accell 300+ box to give accurate tach readings...
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Old Feb 1, 2004 | 04:23 PM
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Default Re: L98 Tach filter (Trog)

Does your tach still function?
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Old Feb 1, 2004 | 04:37 PM
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Default Re: L98 Tach filter (GRX)

Tach works great, did not work worth a damn w/ the filter connected.
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Old Feb 1, 2004 | 04:40 PM
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Default Re: L98 Tach filter (Trog)

Wow, I wonder if the filter was strickly used to suppress electrical noise so the radio wouldn't hum????
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Old Feb 1, 2004 | 05:31 PM
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Default Re: L98 Tach filter (GRX)

I'm trying to remember what I read earlier & I don't think that was it... more to clean up the spiky signal from the stock system...
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Old Feb 2, 2004 | 12:19 AM
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Default Re: L98 Tach filter (GRX)

ttt
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Old Feb 2, 2004 | 12:32 AM
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Default Re: L98 Tach filter (Trog)

My tach has been mucking about since I installed MSD ignition. (sometimes is a bit slow to respond when revved)
Does the tach wire have anything to do with the engine management or is it solely for the tacho?
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Old Feb 2, 2004 | 01:26 AM
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Default Re: L98 Tach filter (timallard)

I think it's only tach. Have you tried bypassing the filter?? It just plugs in on both ends. Easy enough to put back if its not better.
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