Quick question on STR......
STR is how much torque multiplication you get
at high slip (like 3000RPM and not moving, at
launch). More STR makes more pavement thrust
and makes it "come on" over a narrower band
(you have to give slightly more pedal to move,
for the same rated stall speed, on a higher STR
converter but it takes less, beyond that, to get
the full torque multiplication).
STR is one way to make up for too-tall factory
gearing. It's also a good way to get your next set
of tires earlier
at high slip (like 3000RPM and not moving, at
launch). More STR makes more pavement thrust
and makes it "come on" over a narrower band
(you have to give slightly more pedal to move,
for the same rated stall speed, on a higher STR
converter but it takes less, beyond that, to get
the full torque multiplication).
STR is one way to make up for too-tall factory
gearing. It's also a good way to get your next set
of tires earlier
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From: Poway, Ca. where GOD and the sun always shines
Everything jimmyblue said, the letters stand for Stall Torque Ratio, or torque multiplier.
The higher the STR, the more hookup problems you will have.
SteveC
The higher the STR, the more hookup problems you will have.
SteveC
TECH Resident
Joined: Jan 2002
Posts: 877
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From: Poway, Ca. where GOD and the sun always shines
Originally Posted by BoneSS
So if you have a 2.5 str, like me, and you have around 330 tq, then at launch at the stall speed you put down 825 tq? Is that the proper undersanding
SteveC
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You see it on the dyno as absurdly high RWT values,
"torque spikes", if you start at low enough RPM unlocked
or downshift at the start of the pull.
As the input shaft RPM rises, the coupling goes toward
1:1 and conversely, the improved coupling works more
to hold down the engine RPM until the output shaft
catches up.
"torque spikes", if you start at low enough RPM unlocked
or downshift at the start of the pull.
As the input shaft RPM rises, the coupling goes toward
1:1 and conversely, the improved coupling works more
to hold down the engine RPM until the output shaft
catches up.
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Verdad Gallardo TECH Resident
Joined: Jan 2002
Posts: 877
Likes: 55
From: Poway, Ca. where GOD and the sun always shines
Originally Posted by jimmyblue
You see it on the dyno as absurdly high RWT values,
"torque spikes", if you start at low enough RPM unlocked
or downshift at the start of the pull.
As the input shaft RPM rises, the coupling goes toward
1:1 and conversely, the improved coupling works more
to hold down the engine RPM until the output shaft
catches up.
"torque spikes", if you start at low enough RPM unlocked
or downshift at the start of the pull.
As the input shaft RPM rises, the coupling goes toward
1:1 and conversely, the improved coupling works more
to hold down the engine RPM until the output shaft
catches up.
SteveC