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 Post subject: Cluster swap
PostPosted: Mon May 16, 2011 11:19 pm 
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Joined: Tue Jul 08, 2008 12:07 pm
Posts: 1
Location: Mass
I have a 96 3cyl 5spd car that i purchased a factory cluster w/tach off of ebay. After plugging everything it worked fine except the tach seemed to be working a little slow. After plugging im my ScanGauge it confirmed that the tach was not reading as high as it should be. Could this be because it's a 4cyl cluster? I'm not sure if the cluster was from a 3 or 4cyl car. Anybody else had this problem and is there a way to fix it?

Thanks


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 Post subject: Re: Cluster swap
PostPosted: Tue May 17, 2011 11:19 am 
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Joined: Tue Apr 28, 2009 12:43 pm
Posts: 23
Location: Toledo, Ohio
lvd2340 wrote:
I have a 96 3cyl 5spd car that i purchased a factory cluster w/tach off of ebay. After plugging everything it worked fine except the tach seemed to be working a little slow. After plugging im my ScanGauge it confirmed that the tach was not reading as high as it should be. Could this be because it's a 4cyl cluster? I'm not sure if the cluster was from a 3 or 4cyl car. Anybody else had this problem and is there a way to fix it?

Thanks

Good question. I pulled a cluster w/tach off a 97 metro 3 cyl. MT and put it in a 96 metro 4 cyl. auto trans and is approx. 300 rpm higher than actual.


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 Post subject: Re: Cluster swap
PostPosted: Tue May 17, 2011 5:17 pm 
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Joined: Mon Dec 01, 2003 12:47 pm
Posts: 11669
Location: columbus, ohio
if you use a 4 cylinder tach on a 3 cylinder engine it will read 25% lower because it will only reach 75% of it's expected count.

if you use a 3 cylinder tach with a 4 cylinder engine it will read 33% faster, the 4th ignition pulse being an extra 1/3rd of the count the tachometer expects per crank revolution.

there is a very good, older thread that gives specific, photo documented instructions for modifying the tachs in models thru 1997 here on teamswift. it's not hard to do but you have to keep in mind that you are performing surgery on a very delicate, precision device. if you have a radio shack nearby and can half assed solder, you can swap out a few resistors and re-calibrate your tach. :D

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