Dynoing w/o tach
#2
#5
#7
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Thats right, they should put a piece of reflective tape on the dampener and get the signal that way. Even if you had a tach or had the wiring so they could hook up to it, its still alot easier to use reflective tape, not to mention quicker.
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#10
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Join Date: May 2006
Location: Philly PA
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I think that if you are giving your rig to someone who is going to mash it up to full power and tourque, And they are stumped with a tach hookup, You should get back in your truck and go somewhere else!!!!!! I wouldn't trust them.
Peter.
Peter.
#11
Registered User
To count revs while dynoing, both times I had mine done, the operator put a reflective piece of tape on the harmonic balancer and the computer does the rest. You don't need an onboard tach to dyno.
#13
Registered User
On a dynojet if they can't get a good signal from the reflective tap on the damper, which happens alot, you won't get a torque reading. You'll only get a HP reading. Typically once the boost gauge levels off and falls off, you're done, no more power.
#14
I'm pretty sure that they all use optical tachometers. How would they supposed to use a tach hookup on the truck? Do surgery on every truck that gets on the dyno to splice out the hookup?
#15
Registered User
With the tach pickup, they have to mount either a magnetic type mount or clamp type tach pickup underneath the engine/truck to read the tape on the damper. If for some reason this can't be done because of too much grease, something in the way of the tach pickup, can't get the pickup close enough etc, then you get no torque reading.
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