Playback tach ??

MEXJOE · 06-12-2013, 11:04 PM

Any ideas on what may be happing?
I don't have a race pack.

On the Playback tach
1st gear is real smooth to 6000

2nd gear it falls back an sits for a bout 1 second (in slow play back mode)
then climbs slowly and "hops" a bit. to 6000

3rd it falls back to the same spot climbs slowly
from 6300 on it starts" jumping & hopping" real bad.

I don't know what this is the tach looks smooth when making the run
the car doesn't miss or pop and runs a decent MPH 122 IN D/SA
.

Any help or ideas on what is causing this would help, thanks.

GTX JOHN · 06-13-2013, 04:09 AM

All our playback tachs are jerky when played back
in slow motion ...particularly in high gear as they are
moving up more slowly.
On the shifts they drop back momentarily to the converter
stall speed as well have large ratio changes in our transmissions.
Despite this they provide a lot of information to us.

dartman · 06-13-2013, 08:01 AM

x2

G Anderson · 06-13-2013, 06:53 PM

Glen:Mines an older Autometer I bought used but it has always worked real well ! I would say check your ground---

novassdude · 06-13-2013, 08:11 PM

You may want to look at getting a noise filter to cleanup the power and ground.

That and check the grounds. The majority of issues we find at work are ground related.

06-12-2013, 11:04 PM	#1
MEXJOE Senior Member Join Date: Jun 2008 Location: nhranumbers.com Posts: 875 Likes: 137 Liked 165 Times in 51 Posts	Playback tach ?? Any ideas on what may be happing? I don't have a race pack. On the Playback tach 1st gear is real smooth to 6000 2nd gear it falls back an sits for a bout 1 second (in slow play back mode) then climbs slowly and "hops" a bit. to 6000 3rd it falls back to the same spot climbs slowly from 6300 on it starts" jumping & hopping" real bad. I don't know what this is the tach looks smooth when making the run the car doesn't miss or pop and runs a decent MPH 122 IN D/SA . Any help or ideas on what is causing this would help, thanks. Last edited by MEXJOE; 06-12-2013 at 11:07 PM.

06-13-2013, 04:09 AM	#2
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,733 Likes: 2,799 Liked 2,483 Times in 697 Posts	Re: Playback tach ?? All our playback tachs are jerky when played back in slow motion ...particularly in high gear as they are moving up more slowly. On the shifts they drop back momentarily to the converter stall speed as well have large ratio changes in our transmissions. Despite this they provide a lot of information to us.

06-13-2013, 08:01 AM	#3
dartman Member Join Date: Oct 2005 Location: N.S. CANADA Posts: 498 Likes: 160 Liked 68 Times in 41 Posts	Re: Playback tach ?? x2 __________________ 1231 FS/D Drag Pak 1231 E/SA 71 Demon Kelly MacKay Last edited by dartman; 06-13-2013 at 08:13 AM.

06-13-2013, 06:53 PM	#4
G Anderson Member Join Date: Dec 2009 Location: Iowa Posts: 105 Likes: 13 Liked 4 Times in 3 Posts	Re: Playback tach ?? Glen:Mines an older Autometer I bought used but it has always worked real well ! I would say check your ground---

06-13-2013, 08:11 PM	#5
novassdude Senior Member Join Date: Mar 2002 Location: usa Posts: 752 Likes: 204 Liked 136 Times in 49 Posts	Re: Playback tach ?? You may want to look at getting a noise filter to cleanup the power and ground. That and check the grounds. The majority of issues we find at work are ground related. Last edited by novassdude; 06-13-2013 at 08:16 PM. Reason: added

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