Super AFC SAFC2 lower rmp reading than tach
08-02-06, 09:23 PM
#1
Junior Member
Thread Starter
Join Date: Aug 2004
Location: Atlanta
Posts: 42
Likes: 0
Received 0 Likes
on
0 Posts
SAFC2 lower rmp reading than tach
I hooked up my SAFC@ and the rpms on the display are lower than the tach reads. Tach reads about 1000, SAFC2 reads about 900. But when the tach reads about 4000 the SAFC2 reads only 3500. That seams to be a lot of difference, and i have not even tried to see what it would read by redline.
What do u think is wrong?
What do u think is wrong?
08-15-06, 09:16 PM
#4
mmm doritos
iTrader: (4)
Join Date: Apr 2006
Location: lancaster PA
Posts: 2,107
Likes: 0
Received 0 Likes
on
0 Posts
i have the same problem....i know someone here has figured out what causes that to happen...come one guys lets dust off this safc section i know no one ever checks it
08-21-06, 10:40 PM
#6
ERTW
iTrader: (1)
Join Date: Oct 2002
Location: Ottawa, Canada
Posts: 4,328
Likes: 0
Received 0 Likes
on
0 Posts
that seems to be normal discrepency, as i notice this also. the stock tach is not all that accurate. i don't think it is a "problem".
Mazda also seem to have made the speedo read a little higher than actual...
Mazda also seem to have made the speedo read a little higher than actual...
08-23-06, 02:07 PM
#7
even in 4cyl mode with the air point to the up and right my tach safc have different reading teh up at 8000rpms my sfac rads 7200 rpms
yeah if some one could post up their fix that would be great and awesome
yeah if some one could post up their fix that would be great and awesome
Trending Topics
09-01-06, 06:46 AM
#8
Senior Member
Join Date: Dec 2005
Location: Isabela pr
Posts: 301
Likes: 0
Received 0 Likes
on
0 Posts
I read on the SAFC2 manual that this is normal. If I have a chance today I will find out what page this info is on.
Looks like it does it on other cars with analog tach too. :\
Looks like it does it on other cars with analog tach too. :\
09-01-06, 06:01 PM
#9
HAILERS
Join Date: May 2001
Location: FORT WORTH, TEXAS,USA
Posts: 20,563
Likes: 0
Received 21 Likes
on
19 Posts
The factory tach is the discrepant part. Take a digital meter with the capability to read rpm and you'll find the SAFC is closer to the truth.
I see this difference on a 86 n/a I have and I'm sure it's the stock tach thats wrong.. I'm *pretty sure* I checked this out in the past with a meter. Might check it again soon.
Even a meter with Freq should confirm it. Back probe a fuel injector wire (primary) and read the output in freq. It should correspond to rpm. The compare the tach to your meter.
I think my 86 is off a bit more than 100 rpm.
I see this difference on a 86 n/a I have and I'm sure it's the stock tach thats wrong.. I'm *pretty sure* I checked this out in the past with a meter. Might check it again soon.
Even a meter with Freq should confirm it. Back probe a fuel injector wire (primary) and read the output in freq. It should correspond to rpm. The compare the tach to your meter.
I think my 86 is off a bit more than 100 rpm.
Thread
Thread Starter
Forum
Replies
Last Post
streetlegal?
New Member RX-7 Technical
13
03-17-22 02:46 PM
Coolant_Leak
3rd Generation Specific (1993-2002)
2
08-30-15 11:18 AM
