04 Disco lags at 70mph.
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4th Gear
Joined: Sep 2014
Posts: 4
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04 Disco lags at 70mph.
I have a 04 Disco HSE. Many upgrades mainly offroad and suspension to many to
mention and topend rebuilt. Accelleration seems smooth no choppy shifting. On the highway from 55-70 seems to lag even when floored. Doesnt seem to kick into passing mode or downshift to accellerate. Not sure if this is an issue due to I usually used it for towing and didnt go too much above 55 on avg. Just throwing this out there before I have a Land Rover Specialist take a look.
mention and topend rebuilt. Accelleration seems smooth no choppy shifting. On the highway from 55-70 seems to lag even when floored. Doesnt seem to kick into passing mode or downshift to accellerate. Not sure if this is an issue due to I usually used it for towing and didnt go too much above 55 on avg. Just throwing this out there before I have a Land Rover Specialist take a look.
TReK
Joined: Feb 2009
Posts: 2,186
Likes: 200
From: Linden, NJ
I have a 04 Disco HSE. Many upgrades mainly offroad and suspension to many to
mention and topend rebuilt. Accelleration seems smooth no choppy shifting. On the highway from 55-70 seems to lag even when floored. Doesnt seem to kick into passing mode or downshift to accellerate. Not sure if this is an issue due to I usually used it for towing and didnt go too much above 55 on avg. Just throwing this out there before I have a Land Rover Specialist take a look.
mention and topend rebuilt. Accelleration seems smooth no choppy shifting. On the highway from 55-70 seems to lag even when floored. Doesnt seem to kick into passing mode or downshift to accellerate. Not sure if this is an issue due to I usually used it for towing and didnt go too much above 55 on avg. Just throwing this out there before I have a Land Rover Specialist take a look.
Winching
Joined: Jan 2011
Posts: 515
Likes: 36
From: Central Idaho
Did you put larger diameter tires on? This can have a huge impact on the highway drivability. I went with just 1" larger diameter tire and my 01 is really sluggish on the highway. If you want the performance back you might have to install 4:11 gears if you changed the diameter much.
Pro Wrench
Joined: Nov 2015
Posts: 1,935
Likes: 189
From: Coastal Georgia
AUTOMATIC GEARBOX - ZF4HP22 - 24
44-18 DESCRIPTION AND OPERATION
Kickdown
The EAT ECU monitors the input of the throttle position sensor to determine when kickdown is required. When it
detects a kickdown situation, the EAT ECU immediately initiates a down shift provided the target gear will not cause
the engine speed limit to be exceeded.
ELECTRONIC CONTROL
The TCM is located under the left hand front
seat. Using information from the engine
management ECM, together with its own
sensors, the TCM selects the most suitable gear.
Ÿ The gear is selected depends on certain
variables, including:
Ÿ Road speed (from output shaft sensor)
Ÿ Throttle angle (from engine management)
Ÿ Engine Torque (from engine management)
Ÿ Altitude (from engine management)
Ÿ Selector position (from position switch)
The TCM controls gear selection by directing
pressurized transmission fluid to the required
clutch assembly. This is achieved by controlling
the operation of two shift solenoids incorporated
within the valve block.
44-18 DESCRIPTION AND OPERATION
Kickdown
The EAT ECU monitors the input of the throttle position sensor to determine when kickdown is required. When it
detects a kickdown situation, the EAT ECU immediately initiates a down shift provided the target gear will not cause
the engine speed limit to be exceeded.
ELECTRONIC CONTROL
The TCM is located under the left hand front
seat. Using information from the engine
management ECM, together with its own
sensors, the TCM selects the most suitable gear.
Ÿ The gear is selected depends on certain
variables, including:
Ÿ Road speed (from output shaft sensor)
Ÿ Throttle angle (from engine management)
Ÿ Altitude (from engine management)
Ÿ Selector position (from position switch)
The TCM controls gear selection by directing
pressurized transmission fluid to the required
clutch assembly. This is achieved by controlling
the operation of two shift solenoids incorporated
within the valve block.
......
Last edited by number9; Dec 2, 2016 at 05:15 PM.
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