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View Full Version : Dyno tuning/power figures in 3rd instead of 4th


BLK-57L
19-09-2011, 08:04 PM
Just wondering what the differance between 3rd n 4th in a Ve ss manual. I've heard it would be the same power reading just at different rev ranges???
Millsy
19-09-2011, 08:17 PM
From my understanding (on a Mainline)

The difference will be higher Torque numbers due to ramp acceleration or something

Power should be the same
blair_355
19-09-2011, 08:25 PM
I think its more the ratio?

I know with the 4l60e auto 3rd gear is 1:1 ratio.
Maybe manual is same?

I could be far from right though.
GMMAD
19-09-2011, 08:32 PM
From my understanding (on a Mainline)

The difference will be higher Torque numbers due to ramp acceleration or something

Power should be the same
^^^pretty much this
torque will be higher because its a lower gear ...lower the gear the higher the torque reading
but power figure will be the same
ratter
19-09-2011, 08:40 PM
from experience I have seen a little more power on lowered power cars when using 3rd rather than 4th due to higher windage from the faster spinning wheels in 4th, but these observations are from a 6 speed auto
Soopy
19-09-2011, 08:42 PM
4th in an m6 is usually 1:1. 3rd in a 4AT is 1:1.

Power = torque x rpm iircc
white lie
19-09-2011, 08:45 PM
How can the power be the same when the Dyno calculates the power figure from the tractive effort (ie torque)?
Soopy
19-09-2011, 08:47 PM
How can the power be the same when the Dyno calculates the power figure from the tractive effort (ie torque)?

Exactly. But don't bother lol.
GMMAD
19-09-2011, 09:03 PM
Exactly. But don't bother lol.
I take it you have tested your THEORY?
JezzaB
19-09-2011, 09:04 PM
How can the power be the same when the Dyno calculates the power figure from the tractive effort (ie torque)?

Been discussed many many times before


Todd from Mainline:
"Some people will then initially think, the lower the gear, the more Torque, so the more Power we will make, THIS IS NOT TRUE.

Remember the formula for calculating Power, we have Torque AND RPM, so if we use a lower gear ratio, the corresponding RPM will be reduced by the same factor as the Torque is increased, so we end up with the same power. This is a purely mathematical explanation."

http://www.ls1.com.au/forum/showpost.php?p=861945&postcount=17
Soopy
19-09-2011, 09:05 PM
I take it you have tested your THEORY?

Neh...........