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View Full Version : tach fluctuates @ 2-3k rpms

Bigsyke
08-24-2008, 09:26 PM
Just put in some solid mounts. The car seems to struggle a bit in the mid range.

The tach now seems to fluctuate around 2-3k rpms. It flutters about 500-1000rpms starting @ 2k rpm.

Could it be a loose ground, or more likely the cluster being vibrated so bad it shakes the tach needle? thanks fellahs!:hs:
Bigsyke
08-25-2008, 10:18 AM
its an auto tranny, could this be the trans slipping? I assume solid MM's arent too healthy for an auto trans?
Bigsyke
08-26-2008, 01:00 PM
Bump now all the gauges are fluttering.

Solid motor mounts tend to break stuff?
MangoDorifto
08-26-2008, 02:16 PM
I've got solid mounts on my DD S14 SR but the tach only fluctuates at 2-3k on the highway. Not so much on the streets. They do tend to loosen or break things because of all the vibrations. I think your right about the solid mounts not being too friendly with an auto trans though.
Bigsyke
08-26-2008, 02:24 PM
Yea seems the needles only bounce around @ 2-3 on the highway, or hell even in park.

The trans slipping seemed to get better after I added some lubegard red. You think its a loose ground? or just the cluster beeing vibrated.
SRpetey
08-26-2008, 07:44 PM
I've got solid mounts on my DD S14 SR but the tach only fluctuates at 2-3k on the highway. Not so much on the streets. They do tend to loosen or break things because of all the vibrations. I think your right about the solid mounts not being too friendly with an auto trans though.

same thing happens to mine.
tougekid
08-26-2008, 08:05 PM
mines at 3-3500. manual and solid motor and tranns mounts.
dont know why, when on dyno and computer, the read out from them doesnt show any fluxuation.
sooooo i guess its cool.
MangoDorifto
08-27-2008, 12:23 AM
Yea seems the needles only bounce around @ 2-3 on the highway, or hell even in park.

The trans slipping seemed to get better after I added some lubegard red. You think its a loose ground? or just the cluster beeing vibrated.

I think its the cluster being vibrated but it wouldn't hurt to check all your grounds and maybe cluster connections in the back.

I was out running errands today and I paid closer attention to the tach than usual. I noticed if I accelerated slowly above 3k on the streets, it would start to freak out. But if I WOT pass 3k to 4k, it would just climb normally.

I haven't really revved it pass 3k in neutral in a long time, so if I get a chance i'll give that a try and let you know.