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Shifting by the Tach
OK all these distributor threads got me thinkin. Seems everyone is concerned with the tach, which I agree if you have one you want it to work. But thats not what this one is about. Speaking for myself here, when I an driving my car I DO NOT watch my tack I shift by sound and feel. How many on here shift by tach reading and how many by feel??????????? Now my tach does have rpm save that will retain the highest rpm for the key cycle that I will glance at from time to time but thats about all its good for.
I have always listened more than watched. IMHO, no 2 identicaly built engines will perform identically. So why leave anything on the plate. Tongue

[Image: 2rr7aiv.png]

Just cruising along minding our own business when BAM!!! The LAWS show up.
When Im just driving along I seldom look at my tach. But when i'm really running my car I like to check to make sure I dont over-rev the motor. and try to shift just before I hit 6000 rpm. Seems to really be in the power if I shift there and not go any further. Just to try to get to "know" my motor and how it performs, and how hard I can push it. I have a rev limiter set at 6100 or so, but i try not to hit that. I like to run mine once in a while. Smile didnt build it to look at !! LOL


1971 Mach 1
408C Stroker
C4 w/3,000 stall
8.8" Rear w/3.73's
Disc brakes all way around.

[Image: 28ivsix.png]

Mine's an auto, but I never shifted by tach with any of my manual cars. My problem is, at 75 my motor sounds like it's really wound up and that worries me because I have a 2.80:1 rear with a C6 and I don't think it should be running at a really high RPM. So I'd like to be able to see what RPMs the motor is running at. Now last time I drove it at that speed the interior and all windows (except windshield) were out. That would make it louder than normal, obviously.

So I just plugged the #'s in a calculator and I should be running 2800 RPM @ 75 mph. So I should be good. I still want another gear.

Edit: because I'm dumb.


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I shift by sound and feel. I look at the tach when I'm on the highway just to make sure what I'm hearing looks right on the dial.

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73 Convertible 302-4v-3spd yellow /white int

08 Bullitt 4.6-5 spd black/black int

All I ask is a chance to prove that money can't make me happy
I shift when the pull seem to be dropping off a little. I do glance down at the tach to see where I shifted (sometimes)

73 Convertible - 351C/4V CC heads/4bolt/forged flat tops/comp 270/rhodes/mallory unilite/tri-power/hookers/glasspacks/c6/3.50 limited slip/Gear Vendors/Global West sub frames, strut rods and shelby style traction bars/ Rear sway bar/tilt steering (not original)

Pics of modifications included in:
In my drag racing days I shifted by the tach. I agree with You. On my bikes and cars I always shift by sound and feel. My little Honda 400 that I ride to work doesn't even have a tach and it is not missed.
I shift by ear and feel too on my manual cars. Mustang´s got an FMX anyway. But a working tach is just one more source of information of what´s going on up front. I am still planning to get a tach because I´d really like to know about the revs the motor makes under certain conditions like German Autobahn speeding or rough driving on rural roads.
For me it would be only to satisfy my curiosity.

Now, for racing, that would be something completely different!

[Image: 1z21rv4.png]


"If I were you...... I´d rather be me."  Tongue

Check out my video:

Like most, just cruising by "feel" when running hard by tach. It's too easy to spin the engine too hard shifting by ear or feel.

Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

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droptop73;65796 Wrote:Like most, just cruising by "feel" when running hard by tach. It's too easy to spin the engine too hard shifting by ear or feel.

MaybeBlush but my rev limiter works wellIdea
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