Dyno the isf in what gear??
02-18-15, 09:31 AM
#1
Lead Lap
Thread Starter
Dyno the isf in what gear??
what is everyone who has dynode their car is the gear that you have done it in, our 6 th gear is the 1:1 gear, but will not allow you to get a full run ( to redline ) cause of speed limiter .
02-18-15, 09:57 AM
#3
It's okay that it won't read all the way to redline, hp/torque starts to fall off on those last revs anyways.
I can see it being a problem if our cars kept making power all the way to redline though.
10-05-16, 11:24 AM
#7
Racer
So to bump an old thread back, why are guys in the UK using 4th gear to dyno the car? And in this area I'm being told to dyno at 5th gear.
what difference does it really make between dyno'ing in 5th or 6th?
ok I understand 6th gear is 1:1 ratio but what difference does that make?
what difference does it really make between dyno'ing in 5th or 6th?
ok I understand 6th gear is 1:1 ratio but what difference does that make?
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10-06-16, 02:51 AM
#9
Racer
That's what Im worried about lol, I went to a dyno place here and the guy was recommending 5th gear.
Now generally speaking will 6th gear give me more horsepower than 5th? or 4th?
Now generally speaking will 6th gear give me more horsepower than 5th? or 4th?
10-06-16, 06:15 AM
#10
Most of us dyno on a dynojet, with that being said the reason for the dyno in the 1:1 gear ratio is due to the Dynojet. Dynojetmathematically creates a horsepower number based on mass (which is the known weight of the rollers) and accleration (how fast the car is accelerating the known weight).
F=ma
From force (F), we can calculate horsepower.
Dyno the car in 2nd gear, and acceleration (a) goes way up, causing force (F) to go way up.
So by dynoing the car in the gear closest to the 1:1 gear ratio, we eliminate any acceleration advantage or disadvantage caused by thetransmission, which gives us unskewed whp numbers (even though Dynojet has a fudge factor in there which makes them skewed anyways and read high).
As for other dynos out there (i.e. Mustang and Dyno Dynamics) - they use a load cell to measure roll force (the amount of force the tireis placing on the roller). Based on roll force and the radius arm going to the load cell, we get roll torque. Based on roll torque and roll speed, we can get vehicle horsepower. Vehicle horsepower and vehicle RPM gives vehicle torque. It doesn't matter what gear you run in on style dynos as they are measuring force, not acceleration. Force does not change from gear to gear.
*taken from another site
F=ma
From force (F), we can calculate horsepower.
Dyno the car in 2nd gear, and acceleration (a) goes way up, causing force (F) to go way up.
So by dynoing the car in the gear closest to the 1:1 gear ratio, we eliminate any acceleration advantage or disadvantage caused by thetransmission, which gives us unskewed whp numbers (even though Dynojet has a fudge factor in there which makes them skewed anyways and read high).
As for other dynos out there (i.e. Mustang and Dyno Dynamics) - they use a load cell to measure roll force (the amount of force the tireis placing on the roller). Based on roll force and the radius arm going to the load cell, we get roll torque. Based on roll torque and roll speed, we can get vehicle horsepower. Vehicle horsepower and vehicle RPM gives vehicle torque. It doesn't matter what gear you run in on style dynos as they are measuring force, not acceleration. Force does not change from gear to gear.
*taken from another site
10-07-16, 01:02 AM
#11
Racer
Thanks for the clarification Josh
10-07-16, 11:09 PM
#12
Most of us dyno on a dynojet, with that being said the reason for the dyno in the 1:1 gear ratio is due to the Dynojet. Dynojetmathematically creates a horsepower number based on mass (which is the known weight of the rollers) and accleration (how fast the car is accelerating the known weight).
F=ma
From force (F), we can calculate horsepower.
Dyno the car in 2nd gear, and acceleration (a) goes way up, causing force (F) to go way up.
So by dynoing the car in the gear closest to the 1:1 gear ratio, we eliminate any acceleration advantage or disadvantage caused by thetransmission, which gives us unskewed whp numbers (even though Dynojet has a fudge factor in there which makes them skewed anyways and read high).
As for other dynos out there (i.e. Mustang and Dyno Dynamics) - they use a load cell to measure roll force (the amount of force the tireis placing on the roller). Based on roll force and the radius arm going to the load cell, we get roll torque. Based on roll torque and roll speed, we can get vehicle horsepower. Vehicle horsepower and vehicle RPM gives vehicle torque. It doesn't matter what gear you run in on load cell style dynos as they are measuring force, not acceleration. Force does not change from gear to gear.
*taken from another site
F=ma
From force (F), we can calculate horsepower.
Dyno the car in 2nd gear, and acceleration (a) goes way up, causing force (F) to go way up.
So by dynoing the car in the gear closest to the 1:1 gear ratio, we eliminate any acceleration advantage or disadvantage caused by thetransmission, which gives us unskewed whp numbers (even though Dynojet has a fudge factor in there which makes them skewed anyways and read high).
As for other dynos out there (i.e. Mustang and Dyno Dynamics) - they use a load cell to measure roll force (the amount of force the tireis placing on the roller). Based on roll force and the radius arm going to the load cell, we get roll torque. Based on roll torque and roll speed, we can get vehicle horsepower. Vehicle horsepower and vehicle RPM gives vehicle torque. It doesn't matter what gear you run in on load cell style dynos as they are measuring force, not acceleration. Force does not change from gear to gear.
*taken from another site
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