Automotive Engineering - September 2019 - 15

TECHNOLOGY REPORT

ELECTRIFICATION

ZF shifts EV transmission efficiency up a gear
ZF R&D is driving towards
2-speed EVs and called
its 2-speed concept
transmission "a paradigm shift
for electromobility."
2020 Mustang
Shelby GT500.
its claimed 1-100-0 mph time of 10.3s
(Ford steadfastly refused to commit to
a figure for the car's 0-to-60 mph acceleration) by saying the GT500 is the
most-powerful street-legal Ford ever
offered-for "the true ponycar enthusiast who wants supercar performance."
He added the car's validation included
more than 5500 laps at racetracks
across the U.S.

FROM LEFT: FORD; ZF

First Mustang dual-clutch

The Tremec TR-9070 7-speed DCT was
specified largely for its ability to deliver
fast and smooth shifts, said Morgan.
The design has five friction plates for
the odd-gear pack, while gears 2-4-6
have six friction plates. Although it's a
wet-clutch design, Ford said transmission fluid is applied to the clutch surfaces only during "thermal events" to
minimize parasitic losses and optimize
cooling.
The TR-9070's electrohydraulic shift
mechanism employs low-leak solenoids
that Morgan claims can execute shifts in
as little as 80 milliseconds if the driver
selects sport mode, one of five distinct
modes (normal, sport, track, drag,
launch) of automatic operation. The
transmission of course can be manually
shifted via steering-wheel paddles.
The transmission's final drive is 3.73:1
and power flows through a Torsen limited-slip differential. The 2020 Mustang
Shelby GT500 goes on sale later this
year starting at $73,995 "all in," Morgan
grinned. A Carbon Fiber Track Package
can be selected to hike the price for
those who must.
Bill Visnic

AUTOMOTIVE ENGINEERING

ZF Project Engineer Volker Vogel
checked that the Lausitzring test track
ahead was clear and announced: "Now
from stationary on full throttle." From
the rear of the prototype van came the
almost instant and familiar whine of a
very busy electric motor as the speed
built. Then, the unexpected: A slight
change in volume at 70 kph (44 mph)
as the transmission shifted to a second
gear. "It is only at prototype stage."
Implicit in Vogel's words was the
need to make allowances. But that was
not necessary; as shifters go, this is a
real smoothie.
The EV transmission debate for passenger vehicles has so far been on the
side of a single ratio, mainly for reasons
of cost, complexity and weight. But ZF
reckons it is time to look again at the
math-and has decided that for many
applications, two ratios make sense.
It seems a natural thing to do from the
manufacturer whose first initial stands
for Zahnradfabrik: gear factory.
Automotive Engineering recently had
an early drive experience of the
2-speed transmission at Lausitzring,
between Berlin and Dresden. There,
Stephan Demmerer, Head of ZF
Advanced Engineering e-Mobility, plainly regarded the new transmission as a
"paradigm shift for electromobility;"
pun intended. A totally new design, its
optimal combined efficiency is claimed
to be 4.7% better than that of a comparable single-speed.
This could be honed if the "sailing
mode" is linked via the car's CAN com-

munication to a GPS/camera system able
to anticipate downgrades, corners, traffic
light changes and other predictive scenarios in both urban or motorway situations. It also has scalability, embracing
heavier and faster vehicles, and better
tackles towing, explained Demmerer.
The new transmission also has an
automatic hill-start capability when
both clutches are closed. The compact
2-speed unit incorporates both shift
and power electronics.

Efficiency sweet spot

In the prototype, the 2-speed is claimed
to deliver more than 200 km/h (125
mph) compared to a single speed's 160
km/h (100 mph) from a series production 140-kWh motor. The real aim is to
keep in the motor's efficiency sweet
spot to reduce motor rotation speed.
"With longer range we can use a smaller battery, which reduces cost and
weight," said Demmerer. "The 2-speed
transmission can be accommodated in
a package similar to that of a single
speed. So we are developing a modular
and scalable transmission and e-motor
set-great combinations!"
A new e-motor is also being developed with a maximum power rating of
140 kW. The present situation of OEMs
having to choose between high initial
torque or high top speed may be resolved by 2-speed use. ZF's 2-speed
gearbox has been designed to cope
with motors delivering outputs up to
250 kW.
Stuart Birch

September 2019 15



Automotive Engineering - September 2019

Table of Contents for the Digital Edition of Automotive Engineering - September 2019

Automotive Engineering - September 2019
Contents
Editorial: There is no substitute for ˜Automotive Grade"
Standards News
Supplier Eye
What we’re driving
Technology Report
Road Ready
Engineering the 2020 Chevrolet Corvette
Stuck on structural adhesives
Rethinking ADAS materials
Inside VW’s expanding Silicon Valley lab
Product Briefs
Reader Feedback
Companies Mentioned, Upcoming, Ad Index
Q&A
Automotive Engineering - September 2019 - Intro
Automotive Engineering - September 2019 - Automotive Engineering - September 2019
Automotive Engineering - September 2019 - Cover2
Automotive Engineering - September 2019 - 1
Automotive Engineering - September 2019 - Contents
Automotive Engineering - September 2019 - 3
Automotive Engineering - September 2019 - Editorial: There is no substitute for ˜Automotive Grade"
Automotive Engineering - September 2019 - 5
Automotive Engineering - September 2019 - Standards News
Automotive Engineering - September 2019 - 7
Automotive Engineering - September 2019 - Supplier Eye
Automotive Engineering - September 2019 - What we’re driving
Automotive Engineering - September 2019 - Technology Report
Automotive Engineering - September 2019 - 11
Automotive Engineering - September 2019 - 12
Automotive Engineering - September 2019 - 13
Automotive Engineering - September 2019 - 14
Automotive Engineering - September 2019 - 15
Automotive Engineering - September 2019 - Road Ready
Automotive Engineering - September 2019 - 17
Automotive Engineering - September 2019 - 18
Automotive Engineering - September 2019 - 19
Automotive Engineering - September 2019 - Engineering the 2020 Chevrolet Corvette
Automotive Engineering - September 2019 - 21
Automotive Engineering - September 2019 - 22
Automotive Engineering - September 2019 - 23
Automotive Engineering - September 2019 - 24
Automotive Engineering - September 2019 - Stuck on structural adhesives
Automotive Engineering - September 2019 - 26
Automotive Engineering - September 2019 - 27
Automotive Engineering - September 2019 - Rethinking ADAS materials
Automotive Engineering - September 2019 - 29
Automotive Engineering - September 2019 - Inside VW’s expanding Silicon Valley lab
Automotive Engineering - September 2019 - 31
Automotive Engineering - September 2019 - 32
Automotive Engineering - September 2019 - Product Briefs
Automotive Engineering - September 2019 - 34
Automotive Engineering - September 2019 - 35
Automotive Engineering - September 2019 - 36
Automotive Engineering - September 2019 - 37
Automotive Engineering - September 2019 - Reader Feedback
Automotive Engineering - September 2019 - Companies Mentioned, Upcoming, Ad Index
Automotive Engineering - September 2019 - Q&A
Automotive Engineering - September 2019 - Cover3
Automotive Engineering - September 2019 - Cover4
https://www.nxtbook.com/nxtbooks/sae/ave_202101
https://www.nxtbook.com/nxtbooks/sae/20TOFHP12
https://www.nxtbook.com/nxtbooks/sae/20AUTP11
https://www.nxtbook.com/nxtbooks/sae/ave_202011
https://www.nxtbook.com/nxtbooks/sae/20TOFHP10
https://www.nxtbook.com/nxtbooks/sae/20AUTP10
https://www.nxtbook.com/nxtbooks/sae/ave_202009
https://www.nxtbook.com/nxtbooks/sae/20AUTP09
https://www.nxtbook.com/nxtbooks/sae/20AUTP08
https://www.nxtbook.com/nxtbooks/sae/20TOFHP08
https://www.nxtbook.com/nxtbooks/sae/ave_202007
https://www.nxtbook.com/nxtbooks/sae/20AUTP06
https://www.nxtbook.com/nxtbooks/sae/20TOFHP06
https://www.nxtbook.com/nxtbooks/sae/20AUTP05
https://www.nxtbook.com/nxtbooks/sae/ave_202005
https://www.nxtbook.com/nxtbooks/sae/20TOFHP04
https://www.nxtbook.com/nxtbooks/sae/20AUTP04
https://www.nxtbook.com/nxtbooks/sae/ave_202003
https://www.nxtbook.com/nxtbooks/sae/20AUTP03
https://www.nxtbook.com/nxtbooks/sae/20AUTP0102
https://www.nxtbook.com/nxtbooks/sae/20TOFHP02
https://www.nxtbook.com/nxtbooks/sae/ave_202001
https://www.nxtbook.com/nxtbooks/sae/19TOFHP12
https://www.nxtbook.com/nxtbooks/sae/ave_201911
https://www.nxtbook.com/nxtbooks/sae/19AUTP11
https://www.nxtbook.com/nxtbooks/sae/19TOFHP10
https://www.nxtbook.com/nxtbooks/sae/19AUTP10
https://www.nxtbook.com/nxtbooks/sae/ave_201909
https://www.nxtbook.com/nxtbooks/sae/19AUTP09
https://www.nxtbook.com/nxtbooks/sae/19TOFHP08
https://www.nxtbook.com/nxtbooks/sae/19AUTP08
https://www.nxtbook.com/nxtbooks/sae/ave_201907
https://www.nxtbook.com/nxtbooks/sae/19AUTP06
https://www.nxtbook.com/nxtbooks/sae/19TOFHP06
https://www.nxtbook.com/nxtbooks/sae/ave_201905
https://www.nxtbook.com/nxtbooks/sae/19AUTP05
https://www.nxtbook.com/nxtbooks/sae/19TOFHP04
https://www.nxtbook.com/nxtbooks/sae/19AUTP04
https://www.nxtbook.com/nxtbooks/sae/ave_201903
https://www.nxtbook.com/nxtbooks/sae/19AUTP03
https://www.nxtbook.com/nxtbooks/sae/19AUTP02
https://www.nxtbook.com/nxtbooks/sae/19TOFHP02
https://www.nxtbook.com/nxtbooks/sae/19AUTP01
https://www.nxtbook.com/nxtbooks/sae/ave_201901
https://www.nxtbook.com/nxtbooks/sae/18TOFHP12
https://www.nxtbook.com/nxtbooks/sae/18AUTP11
https://www.nxtbook.com/nxtbooks/sae/18MOMP11
https://www.nxtbook.com/nxtbooks/sae/18AUTP10
https://www.nxtbook.com/nxtbooks/sae/ave_201810
https://www.nxtbook.com/nxtbooks/sae/18TOFHP09
https://www.nxtbook.com/nxtbooks/sae/18AUTP09
https://www.nxtbook.com/nxtbooks/sae/18MOMP09
https://www.nxtbook.com/nxtbooks/sae/18TOFHP08
https://www.nxtbook.com/nxtbooks/sae/18AUTP08
https://www.nxtbook.com/nxtbooks/sae/ave_201808
https://www.nxtbook.com/nxtbooks/sae/18AUTP06
https://www.nxtbook.com/nxtbooks/sae/18TOFHP06
https://www.nxtbook.com/nxtbooks/sae/18AUTP05
https://www.nxtbook.com/nxtbooks/sae/ave_201805
https://www.nxtbook.com/nxtbooks/sae/18TOFHP04
https://www.nxtbook.com/nxtbooks/sae/18AUTP04
https://www.nxtbook.com/nxtbooks/sae/18MOMP04
https://www.nxtbook.com/nxtbooks/sae/ave_201803
https://www.nxtbook.com/nxtbooks/sae/18AUTP03
https://www.nxtbook.com/nxtbooks/sae/18TOFHP02
https://www.nxtbook.com/nxtbooks/sae/18AUTP02
https://www.nxtbook.com/nxtbooks/sae/18AUTP01
https://www.nxtbook.com/nxtbooks/sae/17TOFHP12
https://www.nxtbook.com/nxtbooks/sae/17AUTP11_supp
https://www.nxtbook.com/nxtbooks/sae/17AUTP11
https://www.nxtbook.com/nxtbooks/sae/17AUTP10
https://www.nxtbook.com/nxtbooks/sae/17TOFHP10
https://www.nxtbook.com/nxtbooks/sae/17AUTP09
https://www.nxtbook.com/nxtbooks/sae/17TOFHP08
https://www.nxtbook.com/nxtbooks/sae/17AUTP08
https://www.nxtbook.com/nxtbooks/sae/17TOFHP06
https://www.nxtbook.com/nxtbooks/sae/17AUTP06
https://www.nxtbook.com/nxtbooks/sae/17AUTP05
https://www.nxtbook.com/nxtbooks/sae/17TOFHP04
https://www.nxtbook.com/nxtbooks/sae/17AUTP04
https://www.nxtbook.com/nxtbooks/sae/17AUTP03
https://www.nxtbook.com/nxtbooks/sae/17TOFHP02
https://www.nxtbook.com/nxtbooks/sae/17AUTP02
https://www.nxtbook.com/nxtbooks/sae/17AUTP01
https://www.nxtbook.com/nxtbooks/sae/16OFHP12
https://www.nxtbook.com/nxtbooks/sae/16AUTP12
https://www.nxtbook.com/nxtbooks/sae/16AUTP11
https://www.nxtbook.com/nxtbooks/sae/16AUTP10
https://www.nxtbook.com/nxtbooks/sae/16OFHP10
https://www.nxtbook.com/nxtbooks/sae/16AUTP09
https://www.nxtbook.com/nxtbooks/sae/16OFHP08
https://www.nxtbook.com/nxtbooks/sae/16AUTP08
https://www.nxtbook.com/nxtbooks/sae/16AUTD07
https://www.nxtbook.com/nxtbooks/sae/16OFHP06
https://www.nxtbook.com/nxtbooks/sae/16AUTP06
https://www.nxtbook.com/nxtbooks/sae/16AUTD05
https://www.nxtbook.com/nxtbooks/sae/16AUTD04
https://www.nxtbook.com/nxtbooks/sae/16OFHP04
https://www.nxtbook.com/nxtbooks/sae/16AUTD03
https://www.nxtbook.com/nxtbooks/sae/16OFHP02
https://www.nxtbook.com/nxtbooks/sae/16AUTD02
https://www.nxtbook.com/nxtbooks/sae/16AUTD01
https://www.nxtbook.com/nxtbooks/sae/15AUTD12
https://www.nxtbook.com/nxtbooks/sae/15OFHP12
https://www.nxtbook.com/nxtbooks/sae/15AUTP11
https://www.nxtbook.com/nxtbooks/sae/15OFHP10
https://www.nxtbook.com/nxtbooks/sae/15AUTP10
https://www.nxtbook.com/nxtbooks/sae/15AUTP09
https://www.nxtbook.com/nxtbooks/sae/15AUTD08
https://www.nxtbook.com/nxtbooks/sae/15OFHP08
https://www.nxtbook.com/nxtbooks/sae/15AUTP07
https://www.nxtbook.com/nxtbooks/sae/15AUTP06
https://www.nxtbook.com/nxtbooks/sae/15OFHP06
https://www.nxtbook.com/nxtbooks/sae/15AUTD05
https://www.nxtbook.com/nxtbooks/sae/15OFHP04
https://www.nxtbook.com/nxtbooks/sae/15AUTP04
https://www.nxtbook.com/nxtbooks/sae/15AUTP03
https://www.nxtbook.com/nxtbooks/sae/15OFHP02
https://www.nxtbook.com/nxtbooks/sae/15AUTP02
https://www.nxtbook.com/nxtbooks/sae/15AUTD01
https://www.nxtbook.com/nxtbooks/sae/14OFHD12
https://www.nxtbook.com/nxtbooks/sae/14AUTD12
https://www.nxtbook.com/nxtbooks/sae/14VED11
https://www.nxtbook.com/nxtbooks/sae/14AERD11
https://www.nxtbook.com/nxtbooks/sae/14OFHP11
https://www.nxtbook.com/nxtbooks/sae/14AUTP11
https://www.nxtbook.com/nxtbooks/sae/14OFHD10
https://www.nxtbook.com/nxtbooks/sae/14AUTP10
https://www.nxtbook.com/nxtbooks/sae/14AUTD09
https://www.nxtbook.com/nxtbooks/sae/14AERD09
https://www.nxtbook.com/nxtbooks/sae/14OFHP09
https://www.nxtbook.com/nxtbooks/sae/14AUTP09
https://www.nxtbook.com/nxtbooks/sae/14VED08
https://www.nxtbook.com/nxtbooks/sae/14OFHD08
https://www.nxtbook.com/nxtbooks/sae/14AUTD08
https://www.nxtbook.com/nxtbooks/sae/14AERD07
https://www.nxtbook.com/nxtbooks/sae/14OFHP07
https://www.nxtbook.com/nxtbooks/sae/14AUTP07
https://www.nxtbook.com/nxtbooks/sae/14OFHD06
https://www.nxtbook.com/nxtbooks/sae/14AUTP06
https://www.nxtbook.com/nxtbooks/sae/14VED05
https://www.nxtbook.com/nxtbooks/sae/14AERD05
https://www.nxtbook.com/nxtbooks/sae/14AUTD05
https://www.nxtbook.com/nxtbooks/sae/14OFHP05
https://www.nxtbook.com/nxtbooks/sae/14OFHD04
https://www.nxtbook.com/nxtbooks/sae/14AUTP04
https://www.nxtbook.com/nxtbooks/sae/14AUTD03
https://www.nxtbook.com/nxtbooks/sae/14AERD03
https://www.nxtbook.com/nxtbooks/sae/14OFHP03
https://www.nxtbook.com/nxtbooks/sae/14AUTP03
https://www.nxtbook.com/nxtbooks/sae/14VED02
https://www.nxtbook.com/nxtbooks/sae/14OFHP02
https://www.nxtbook.com/nxtbooks/sae/14AUTP02
https://www.nxtbook.com/nxtbooks/sae/14OFHD01
https://www.nxtbook.com/nxtbooks/sae/14AERD01
https://www.nxtbook.com/nxtbooks/sae/14AUTD01
https://www.nxtbook.com/nxtbooks/sae/13AEID1203
https://www.nxtbook.com/nxtbooks/sae/13EVSD1218
https://www.nxtbook.com/nxtbooks/sae/13OFHD1212
https://www.nxtbook.com/nxtbooks/sae/13OFHD1107
https://www.nxtbook.com/nxtbooks/sae/13AERD1106
https://www.nxtbook.com/nxtbooks/sae/13AEID1105
https://www.nxtbook.com/nxtbooks/sae/13EVSD1024
https://www.nxtbook.com/nxtbooks/sae/13AEID1022
https://www.nxtbook.com/nxtbooks/sae/13OFHD1017
https://www.nxtbook.com/nxtbooks/sae/13AEID1001
https://www.nxtbook.com/nxtbooks/sae/13AEID0917
https://www.nxtbook.com/nxtbooks/sae/13OFHD0905
https://www.nxtbook.com/nxtbooks/sae/13AERD0904
https://www.nxtbook.com/nxtbooks/sae/13AEID0903
https://www.nxtbook.com/nxtbooks/sae/13EVSD0821
https://www.nxtbook.com/nxtbooks/sae/13OFHD0808
https://www.nxtbook.com/nxtbooks/sae/13AEID0806
https://www.nxtbook.com/nxtbooks/sae/13AEID0716
https://www.nxtbook.com/nxtbooks/sae/13OFHD0711
https://www.nxtbook.com/nxtbooks/sae/13AERD0703
https://www.nxtbook.com/nxtbooks/sae/13AEID0702
https://www.nxtbook.com/nxtbooks/sae/13EVSD0626
https://www.nxtbook.com/nxtbooks/sae/13AEID0618
https://www.nxtbook.com/nxtbooks/sae/13OFHD0613
https://www.nxtbook.com/nxtbooks/sae/13AEID0604
https://www.nxtbook.com/nxtbooks/sae/13OFHD0509
https://www.nxtbook.com/nxtbooks/sae/13AEID0507
https://www.nxtbook.com/nxtbooks/sae/13AERD0501
https://www.nxtbook.com/nxtbooks/sae/13EVSD0418
https://www.nxtbook.com/nxtbooks/sae/13AEID0416
https://www.nxtbook.com/nxtbooks/sae/13OFHD0404
https://www.nxtbook.com/nxtbooks/sae/13AEID0402
https://www.nxtbook.com/nxtbooks/sae/13AEID0319
https://www.nxtbook.com/nxtbooks/sae/13OFHD0307
https://www.nxtbook.com/nxtbooks/sae/13AERD0306
https://www.nxtbook.com/nxtbooks/sae/13AEID0305
https://www.nxtbook.com/nxtbooks/sae/13EVSD0221
https://www.nxtbook.com/nxtbooks/sae/13OFHD0207
https://www.nxtbook.com/nxtbooks/sae/13AEID0205
https://www.nxtbook.com/nxtbooks/sae/13AEID0115
https://www.nxtbook.com/nxtbooks/sae/13OFHD0110
https://www.nxtbook.com/nxtbooks/sae/13AERD0102
https://www.nxtbook.com/nxtbooks/sae/12EVSD1218
https://www.nxtbook.com/nxtbooks/sae/12OFHD1213
https://www.nxtbook.com/nxtbooks/sae/12AERD1212
https://www.nxtbook.com/nxtbooks/sae/12AEID1204
https://www.nxtbook.com/nxtbooks/sae/12OFHD1129
https://www.nxtbook.com/nxtbooks/sae/12AERD1114
https://www.nxtbook.com/nxtbooks/sae/12OFHD1108
https://www.nxtbook.com/nxtbooks/sae/12AEID1106
https://www.nxtbook.com/nxtbooks/sae/12EVSD1025
https://www.nxtbook.com/nxtbooks/sae/12AERD1024
https://www.nxtbook.com/nxtbooks/sae/12AEID1023
https://www.nxtbook.com/nxtbooks/sae/12OFHD1011
https://www.nxtbook.com/nxtbooks/sae/12AEID1002
https://www.nxtbook.com/nxtbooks/sae/12OFHD0927
https://www.nxtbook.com/nxtbooks/sae/12AEID0918
https://www.nxtbook.com/nxtbooks/sae/12AERD0912
https://www.nxtbook.com/nxtbooks/sae/12OFHD0906
https://www.nxtbook.com/nxtbooks/sae/12AEID0904
https://www.nxtbook.com/nxtbooks/sae/12EVSD0821
https://www.nxtbook.com/nxtbooks/sae/12AERD0815
https://www.nxtbook.com/nxtbooks/sae/12OFHD0809
https://www.nxtbook.com/nxtbooks/sae/12AEID0807
https://www.nxtbook.com/nxtbooks/sae/12OFHD0726
https://www.nxtbook.com/nxtbooks/sae/12AERD0718
https://www.nxtbook.com/nxtbooks/sae/12AEID0717
https://www.nxtbook.com/nxtbooks/sae/12OFHD0705
https://www.nxtbook.com/nxtbooks/sae/12AEID0703
https://www.nxtbook.com/nxtbooks/sae/12EVSD0626
https://www.nxtbook.com/nxtbooks/sae/12AEID0619
https://www.nxtbook.com/nxtbooks/sae/12OFHD0614
https://www.nxtbook.com/nxtbooks/sae/12AERD0613
https://www.nxtbook.com/nxtbooks/sae/12AEID0605
https://www.nxtbook.com/nxtbooks/sae/12OFHD0524
https://www.nxtbook.com/nxtbooks/sae/12AERD0516
https://www.nxtbook.com/nxtbooks/sae/12OFHD0503
https://www.nxtbook.com/nxtbooks/sae/12AEID0501
https://www.nxtbook.com/nxtbooks/sae/12OFHD0419
https://www.nxtbook.com/nxtbooks/sae/12EVSD0418
https://www.nxtbook.com/nxtbooks/sae/12AEID0417
https://www.nxtbook.com/nxtbooks/sae/12AERD0411
https://www.nxtbook.com/nxtbooks/sae/12AEID0403
https://www.nxtbook.com/nxtbooks/sae/12OFHD0329
https://www.nxtbook.com/nxtbooks/sae/12AEID0320
https://www.nxtbook.com/nxtbooks/sae/12AERD0314
https://www.nxtbook.com/nxtbooks/sae/12OFHD0308
https://www.nxtbook.com/nxtbooks/sae/12AEID0306
https://www.nxtbook.com/nxtbooks/sae/12OFHD0223
https://www.nxtbook.com/nxtbooks/sae/12EVSD0221
https://www.nxtbook.com/nxtbooks/sae/12AERD0215
https://www.nxtbook.com/nxtbooks/sae/12AEID0207
https://www.nxtbook.com/nxtbooks/sae/12OFHD0202
https://www.nxtbook.com/nxtbooks/sae/12AERD0118
https://www.nxtbook.com/nxtbooks/sae/12AEID0117
https://www.nxtbook.com/nxtbooks/sae/12OFHD0112
https://www.nxtbook.com/nxtbooks/sae/11OFHD1215
https://www.nxtbook.com/nxtbooks/sae/11AERD1214
https://www.nxtbook.com/nxtbooks/sae/11AEID1206
https://www.nxtbook.com/nxtbooks/sae/11EVSD1130
https://www.nxtbook.com/nxtbooks/sae/11OFHD1117
https://www.nxtbook.com/nxtbooks/sae/11AERD1116
https://www.nxtbook.com/nxtbooks/sae/11OFHD1103
https://www.nxtbook.com/nxtbooks/sae/11AEID1101
https://www.nxtbook.com/nxtbooks/sae/11AERD1026
https://www.nxtbook.com/nxtbooks/sae/11AEID1018
https://www.nxtbook.com/nxtbooks/sae/11OFHD1013
https://www.nxtbook.com/nxtbooks/sae/11AERD1012
https://www.nxtbook.com/nxtbooks/sae/11AEID1004
https://www.nxtbook.com/nxtbooks/sae/11AERD0928
https://www.nxtbook.com/nxtbooks/sae/11OFHD0922
https://www.nxtbook.com/nxtbooks/sae/11AEID0920
https://www.nxtbook.com/nxtbooks/sae/11AERD0907
https://www.nxtbook.com/nxtbooks/sae/11AEID0906
https://www.nxtbook.com/nxtbooks/sae/11OFHD0901
https://www.nxtbook.com/nxtbooks/sae/11OFHD_lubrizol-ch
https://www.nxtbook.com/nxtbooks/sae/11EVSD0824
https://www.nxtbook.com/nxtbooks/sae/11OFHD_lubrizol
https://www.nxtbook.com/nxtbooks/sae/11AERD0817
https://www.nxtbook.com/nxtbooks/sae/11OFHD0811
https://www.nxtbook.com/nxtbooks/sae/11AEID0802
https://www.nxtbook.com/nxtbooks/sae/11AERD0727
https://www.nxtbook.com/nxtbooks/sae/11OFHD0728
https://www.nxtbook.com/nxtbooks/sae/11AEID0719
https://www.nxtbook.com/nxtbooks/sae/11AERD0713
https://www.nxtbook.com/nxtbooks/sae/11OFHD0707
https://www.nxtbook.com/nxtbooks/sae/11AEID0705
https://www.nxtbook.com/nxtbooks/sae/11AERD0629
https://www.nxtbook.com/nxtbooks/sae/11AEID0621
https://www.nxtbook.com/nxtbooks/sae/11OFHD0616
https://www.nxtbook.com/nxtbooks/sae/11AERD0608
https://www.nxtbook.com/nxtbooks/sae/11AEID0607
https://www.nxtbook.com/nxtbooks/sae/11OFHD0526
https://www.nxtbook.com/nxtbooks/sae/11EVSD0525
https://www.nxtbook.com/nxtbooks/sae/11AERD0518
https://www.nxtbook.com/nxtbooks/sae/11AEID0503
https://www.nxtbook.com/nxtbooks/sae/11OFHD0505
https://www.nxtbook.com/nxtbooks/sae/11AERD0427
https://www.nxtbook.com/nxtbooks/sae/11AEID0419
https://www.nxtbook.com/nxtbooks/sae/11OFHD0414
https://www.nxtbook.com/nxtbooks/sae/11AERD0413
https://www.nxtbook.com/nxtbooks/sae/11AEID0405
https://www.nxtbook.com/nxtbooks/sae/11OFHD0331
https://www.nxtbook.com/nxtbooks/sae/11AERD0323
https://www.nxtbook.com/nxtbooks/sae/11AEID0315
https://www.nxtbook.com/nxtbooks/sae/11OFHD0310
https://www.nxtbook.com/nxtbooks/sae/11AERD0302
https://www.nxtbook.com/nxtbooks/sae/11AEID0301
https://www.nxtbook.com/nxtbooks/sae/11EVSD0223
https://www.nxtbook.com/nxtbooks/sae/11OFHD0217
https://www.nxtbook.com/nxtbooks/sae/11AERD0209
https://www.nxtbook.com/nxtbooks/sae/11OFHD0204
https://www.nxtbook.com/nxtbooks/sae/11AEID0201
https://www.nxtbook.com/nxtbooks/sae/11AERD0119
https://www.nxtbook.com/nxtbooks/sae/11AEID0118
https://www.nxtbook.com/nxtbooks/sae/11OFHD0113
https://www.nxtbook.com/nxtbooks/sae/10AEID1221
https://www.nxtbook.com/nxtbooks/sae/10AEMD1215
https://www.nxtbook.com/nxtbooks/sae/10OFHD1216
https://www.nxtbook.com/nxtbooks/sae/10AEID1207
https://www.nxtbook.com/nxtbooks/sae/10OFHD1203
https://www.nxtbook.com/nxtbooks/sae/10OFHD1118
https://www.nxtbook.com/nxtbooks/sae/10AEID1116
https://www.nxtbook.com/nxtbooks/sae/10AEID1102
https://www.nxtbook.com/nxtbooks/sae/10AEMD1110
https://www.nxtbook.com/nxtbooks/sae/10EVSD1104
https://www.nxtbook.com/nxtbooks/sae/10OFHD1028
https://www.nxtbook.com/nxtbooks/sae/10AEMD1027
https://www.nxtbook.com/nxtbooks/sae/10OFHD1014
https://www.nxtbook.com/nxtbooks/sae/10AEMD1013
https://www.nxtbook.com/nxtbooks/sae/10AEID1014
https://www.nxtbook.com/nxtbooks/sae/10AEID1005
https://www.nxtbook.com/nxtbooks/sae/10OFHD1001
https://www.nxtbook.com/nxtbooks/sae/10OFHD0923
https://www.nxtbook.com/nxtbooks/sae/10AEID0921
https://www.nxtbook.com/nxtbooks/sae/10AEMD0915
https://www.nxtbook.com/nxtbooks/sae/10OFHD0909
https://www.nxtbook.com/nxtbooks/sae/10AEMD0908
https://www.nxtbook.com/nxtbooks/sae/10AEID0907
https://www.nxtbook.com/nxtbooks/sae/10AEMD0901
https://www.nxtbook.com/nxtbooks/sae/10OFHD0826
https://www.nxtbook.com/nxtbooks/sae/10AEMD0825
https://www.nxtbook.com/nxtbooks/sae/10AEID0817
https://www.nxtbook.com/nxtbooks/sae/10AEMD0811
https://www.nxtbook.com/nxtbooks/sae/10AEID0803
https://www.nxtbook.com/nxtbooks/sae/10OFHD0803
https://www.nxtbook.com/nxtbooks/sae/10AEMD0728
https://www.nxtbook.com/nxtbooks/sae/10OFHD0722
https://www.nxtbook.com/nxtbooks/sae/10AEMD0721
https://www.nxtbook.com/nxtbooks/sae/10AEID0720
https://www.nxtbook.com/nxtbooks/sae/10OFHD0708
https://www.nxtbook.com/nxtbooks/sae/10AEMD0707
https://www.nxtbook.com/nxtbooks/sae/10AEID0707
https://www.nxtbook.com/nxtbooks/sae/10OFHD0624
https://www.nxtbook.com/nxtbooks/sae/10AEMD0623
https://www.nxtbook.com/nxtbooks/sae/10AEMD0616
https://www.nxtbook.com/nxtbooks/sae/10AEID0615
https://www.nxtbook.com/nxtbooks/sae/100FHD0422_v2
https://www.nxtbook.com/nxtbooks/sae/10AEMD0609
https://www.nxtbook.com/nxtbooks/sae/10AEMD0602
https://www.nxtbook.com/nxtbooks/sae/10AEID0601
https://www.nxtbook.com/nxtbooks/sae/10OFHD0603
https://www.nxtbook.com/nxtbooks/sae/10AEMD0526
https://www.nxtbook.com/nxtbooks/sae/10OFHD0520
https://www.nxtbook.com/nxtbooks/sae/10AEID0518
https://www.nxtbook.com/nxtbooks/sae/10AEMD0519
https://www.nxtbook.com/nxtbooks/sae/10AEMD0512
https://www.nxtbook.com/nxtbooks/sae/10OFHD0506
https://www.nxtbook.com/nxtbooks/sae/10AEMD0505
https://www.nxtbook.com/nxtbooks/sae/10AEID0504
https://www.nxtbook.com/nxtbooks/sae/10AEMD0428
https://www.nxtbook.com/nxtbooks/sae/10OFHD0422
https://www.nxtbook.com/nxtbooks/sae/10AEMD0421
https://www.nxtbook.com/nxtbooks/sae/10AEID0420
https://www.nxtbook.com/nxtbooks/sae/10AEMD0407
https://www.nxtbook.com/nxtbooks/sae/10AEID0406
https://www.nxtbook.com/nxtbooks/sae/10AEMD0331
https://www.nxtbook.com/nxtbooks/sae/10OFHD0405
https://www.nxtbook.com/nxtbooks/sae/10OFHD0325
https://www.nxtbook.com/nxtbooks/sae/10AEMD0324
https://www.nxtbook.com/nxtbooks/sae/10AEMD0317
https://www.nxtbook.com/nxtbooks/sae/10AEID0316
https://www.nxtbook.com/nxtbooks/sae/10OFHD0311
https://www.nxtbook.com/nxtbooks/sae/10AEMD0310
https://www.nxtbook.com/nxtbooks/sae/10AEMD0303
https://www.nxtbook.com/nxtbooks/sae/10AEID0302
https://www.nxtbook.com/nxtbooks/sae/10OFHD0225
https://www.nxtbook.com/nxtbooks/sae/10AEMD0224
https://www.nxtbook.com/nxtbooks/sae/10AEMD0217
https://www.nxtbook.com/nxtbooks/sae/10AEID0216
https://www.nxtbook.com/nxtbooks/sae/10AEMD0210
https://www.nxtbook.com/nxtbooks/sae/10AEMD0203
https://www.nxtbook.com/nxtbooks/sae/10AEID0202
https://www.nxtbook.com/nxtbooks/sae/10OFHD0203
https://www.nxtbook.com/nxtbooks/sae/10OFHD0128
https://www.nxtbook.com/nxtbooks/sae/10AEMD0127
https://www.nxtbook.com/nxtbooks/sae/10AEMD0120
https://www.nxtbook.com/nxtbooks/sae/10OFHD0114
https://www.nxtbook.com/nxtbooks/sae/10AEID0119
https://www.nxtbook.com/nxtbooks/sae/10AEMD0113
https://www.nxtbook.com/nxtbooks/sae/10AEID0105_v2
https://www.nxtbook.com/nxtbooks/sae/10AEID0105
https://www.nxtbook.com/nxtbooks/sae/09AEMD1223
https://www.nxtbook.com/nxtbooks/sae/09AEMD1209
https://www.nxtbook.com/nxtbooks/sae/AUTODEC09
https://www.nxtbook.com/nxtbooks/sae/09AEMD1125
https://www.nxtbook.com/nxtbooks/sae/09AEMD1111
https://www.nxtbook.com/nxtbooks/sae/AUTONOV09
https://www.nxtbook.com/nxtbooks/sae/OFHNOV09
https://www.nxtbook.com/nxtbooks/sae/09AEMD1028
https://www.nxtbook.com/nxtbooks/sae/09AEMD1014
https://www.nxtbook.com/nxtbooks/sae/OFHOCT09
https://www.nxtbook.com/nxtbooks/sae/AUTOOCT09
https://www.nxtbook.com/nxtbooks/sae/09AEMD0930
https://www.nxtbook.com/nxtbooks/sae/09AEMD0916
https://www.nxtbook.com/nxtbooks/sae/AUTOSEP09
https://www.nxtbook.com/nxtbooks/sae/09AEMD0902
https://www.nxtbook.com/nxtbooks/sae/09AEMD0819
https://www.nxtbook.com/nxtbooks/sae/OFHAUG09
https://www.nxtbook.com/nxtbooks/sae/09AEMD0805
https://www.nxtbook.com/nxtbooks/sae/AUTOAUG09
https://www.nxtbookmedia.com