Mike Conway set the pace with a 1m56.172s lap at the start of the session aboard the #7 Toyota TS050 Hybrid, an improvement of more than two seconds over Fernando Alonso's session one best. 

Kazuki Nakajima was fastest in the sister Toyota on a 1m56.815s in the 90-minute afternoon session.

That put them comfortably ahead of the best privateer lap of 1m58.835s set by Pietro Fittipaldi in DragonSpeed's Gibson-powered BR Engineering BR1. 

The two Rebellion R-13-Gibsons took fourth and fifth positions in the times. Gustavo Menezes posted a 1m59.011s to end up just over half a second up on teammate Neel Jani. 

The two SMP Racing BR1s, which are powered by the AER turbo engine, took sixth and seventh, ahead of the ByKolles ENSO CLM P1/01-Nissan.

Stephane Sarrazin set the fastest SMP time with a 2m00.035s before putting the car in the gravel at Stavelot, causing the first of two red flags. 

Neither of the Manor Ginetta G60-LT-P1-Mecachromes registered times after completing only one in-out lap apiece. 

Pastor Maldonado was quickest in LMP2 aboard DragonSpeed's Oreca 07. His time of 2m02.991s put him three tenths up on Nabil Jeffri's 2m03.306s in the best of the Jackie Chan DC Racing Orecas. 

Matthieu Vaxiviere caused the second red flag when he went off in the TDS Racing Oreca at Malmedy corner. 

The Ganassi Ford squad again led the way in GTE Pro, Stefan Mucke heading the times with a 2m13.733s, giving him a margin of nine tenths of Gianmaria Bruni's 2m14.647s in the best of the factory Porsche 911 RSRs. 

The second cars from Ford and Porsche took third and fourth respectively in the hands of Harry Tincknell and Kevin Estre. 

Best of the rest in fifth was James Calado in the #51 AF Corse Ferrari 488 GTE on a 2m15.516s, while Aston Martin improved to sixth fastest with its new-generation Vantage.

BMW's pair of new M8 GTEs were slowest in class.

Ben Barker was fastest in GTE Am for the Gulf Racing Porsche squad, jumping ahead of the #77 Proton Porsche in the closing stages.

Second practice results:

Pos.	#	Drivers	Car	Class	Laps	Time	Gap
1	7	Kamui Kobayashi   Mike Conway   Jose Maria Lopez	Toyota TS050 Hybrid	LMP1	29	1'56.172
2	8	Fernando Alonso   Kazuki Nakajima   Sébastien Buemi	Toyota TS050 Hybrid	LMP1	33	1'56.815	0.643
3	10	Henrik Hedman   Ben Hanley   Pietro Fittipaldi	BR Engineering BR1 - Gibson	LMP1	24	1'58.835	2.663
4	3	Mathias Beche   Thomas Laurent   Gustavo Menezes	Rebellion R13 - Gibson	LMP1	30	1'59.011	2.839
5	1	Andre Lotterer   Bruno Senna   Neel Jani	Rebellion R13 - Gibson	LMP1	24	1'59.580	3.408
6	17	Stéphane Sarrazin   Matevos Isaakyan   Egor Orudzhev	BR Engineering BR1 - AER	LMP1	23	2'00.035	3.863
7	11	Vitaly Petrov   Mikhail Aleshin	BR Engineering BR1 - AER	LMP1	27	2'00.192	4.020
8	4	Oliver Webb   Dominik Kraihamer   Tom Dillmann	ENSO CLM P1/01 - Nismo	LMP1	16	2'01.466	5.294
9	31	Pastor Maldonado   Nathanael Berthon   Roberto Gonzalez	Oreca 07 - Gibson	LMP2	31	2'02.991	6.819
10	37	Nabil Jeffri   Weiron Tan   Jazeman Jaafar	Oreca 07 - Gibson	LMP2	29	2'03.306	7.134
11	26	Jean-Eric Vergne   Roman Rusinov   Andrea Pizzitola	Oreca 07 - Gibson	LMP2	28	2'03.594	7.422
12	50	Fernando Rees   Romano Ricci   Erwin Creed	Ligier JSP217 - Gibson	LMP2	17	2'03.881	7.709
13	38	Ho-Pin Tung   Stéphane Richelmi   Gabriel Aubry	Oreca 07 - Gibson	LMP2	27	2'04.279	8.107
14	36	Nicolas Lapierre   Pierre Thiriet   Andre Negrao	Alpine A470 - Gibson	LMP2	30	2'05.296	9.124
15	29	Jan Lammers   Giedo van der Garde   Frits van Eerd	Dallara P217 - Gibson	LMP2	30	2'05.973	9.801
16	28	Loic Duval   François Perrodo   Matthieu Vaxiviere	Oreca 07 - Gibson	LMP2	12	2'06.734	10.562
17	66	Stefan Mücke   Olivier Pla   Billy Johnson	Ford GT	LMGTE PRO	16	2'13.733	17.561
18	91	Gianmaria Bruni   Richard Lietz	Porsche 911 RSR	LMGTE PRO	31	2'14.647	18.475
19	67	Harry Tincknell   Tony Kanaan   Andy Priaulx	Ford GT	LMGTE PRO	29	2'14.706	18.534
20	92	Michael Christensen   Kevin Estre	Porsche 911 RSR	LMGTE PRO	31	2'15.183	19.011
21	51	James Calado   Alessandro Pier Guidi	Ferrari 488 GTE EVO	LMGTE PRO	30	2'15.516	19.344
22	95	Marco Sorensen   Nicki Thiim   Darren Turner	Aston Martin Vantage AMR	LMGTE PRO	23	2'15.564	19.392
23	71	Sam Bird   Davide Rigon	Ferrari 488 GTE EVO	LMGTE PRO	29	2'15.779	19.607
24	86	Michael Wainwright   Ben Barker   Alex Davison	Porsche 911 RSR	LMGTE AM	26	2'16.113	19.941
25	97	Jonathan Adam   Maxime Martin   Alex Lynn	Aston Martin Vantage AMR	LMGTE PRO	25	2'16.182	20.010
26	77	Christian Ried   Matt Campbell    Julien Andlauer	Porsche 911 RSR	LMGTE AM	28	2'16.434	20.262
27	82	Antonio Felix da Costa  Tom Blomqvist	BMW M8 GTE	LMGTE PRO	28	2'16.782	20.610
28	98	Pedro Lamy   Paul Dalla Lana   Mathias Lauda	Aston Martin Vantage	LMGTE AM	28	2'16.790	20.618
29	54	Giancarlo Fisichella   Francesco Castellacci   Thomas Flohr	Ferrari 488 GTE	LMGTE AM	29	2'16.897	20.725
30	88	Khaled Al Qubaisi   Matteo Cairoli   Giorgio Roda	Porsche 911 RSR	LMGTE AM	29	2'17.057	20.885
31	81	Nick Catsburg   Martin Tomczyk	BMW M8 GTE	LMGTE PRO	30	2'17.100	20.928
32	90	Salih Yoluc   Euan Hankey   Charlie Eastwood	Aston Martin Vantage	LMGTE AM	24	2'17.229	21.057
33	56	Jörg Bergmeister   Patrick Lindsey   Egidio Perfetti	Porsche 911 RSR	LMGTE AM	29	2'17.377	21.205
34	61	Matt Griffin   Mok Weng Sun   Keita Sawa	Ferrari 488 GTE	LMGTE AM	29	2'17.552	21.380
35	70	Olivier Beretta    Eddie Cheever III   Motoaki Ishikawa	Ferrari 488 GTE	LMGTE AM	29	2'18.340	22.168