How accurate is the hp/tq histogram?

[dleach1407]

How accurate is the hp/tq histogram?

[decipha]

I only made it to help visualize the torque curve so you know where peak torque is occurring at.

[wwhite]

I've been graphing TQ_NET(Net engine torque into transmission, ft-lb.) on EEC-IV SD E4OD, and appears to be very accurate.

TORQUE CALCULATION
OVERVIEW

The engine output torque, or net torque, is calculated from a table of
indicated torque versus speed/load, determined at MBT spark timing, 14.6 A/F
ratio and no EGR. This torque value is then adjusted by multiplying by a
factor dependent on the difference between MBT spark (adjusted for actual EGR
flow), actual spark advance, and if in open loop fuel control, by a factor
dependent on the value of lambse. This value is then further reduced by
subtracting friction torque and accessory load torque. Net torque (TQ_NET)
is used in the electronic transmission control strategy in calculating the
EPC required for "static capacity".

[decipha]

thats only going to be as accurate as your torque table is

the tq and hp payloads i made in tunerpro are based on airmass so will show you where your actual peak torque is occurring which is really all you need to know

[dnschneid]

would you say the width of the airmass-based torque curve is sufficiently accurate to use as a basis for evaluating ideal gear spacing?