Ex-Formula 1 racer Nasr posted a best time of 2m04.443s at the wheel of the #5 Penske Oreca 07-Gibson on Friday morning to make it a second session in a row topped outright by an LMP2 car.
The Brazilian's benchmark was more than a second faster than the time with which WRT's Robin Frijns paced first practice on Thursday.
Making it a one-two on the overall leaderboard for US entrants was Glickenhaus driver Olivier Pla, who topped the four-car Hypercar division with a 2m04.464s in the boutique marque's solo 007 LMH.
Third-fastest was the best of the two Toyota GR010 Hybrids, the #8 car, which topped the times early on with a 2m04.692s in the hands of Brendon Hartley - 0.249s off the pace set by Nasr.
The sister #7 Toyota was sixth-fastest with Jose Maria Lopez setting a 2m05.128s.
Splitting the two Japanese cars were the second- and third-fastest LMP2 runners, with the #23 United Autosports Oreca of Oliver Jarvis leading the Prema machine of Louis Deletraz.
United's second car, driven by Filipe Albuquerque, was fourth in the LMP2 standings and seventh overall, followed by the two JOTA Orecas, led by the #38 machine with Will Stevens driving.
Watch qualifying for the WEC Six Hours of Spa live on Motorsport.tv (geo-restrictions may apply).
The fourth and final hypercar entry, the Alpine A480 grandfathered LMP1 car, was 10th overall and a little more than a second off the pace in the hands of Andre Negrao.
Leading the way in the LMP2 Pro/Am subclass was the AF Corse Oreca of Alessio Rovera.
Porsche once again topped the times in the GTE Pro division, as Michael Christensen narrowly improved on the best time set in FP1 with a best effort of 2m14.366s in the #92 911 RSR-19.
Ferrari this time ended up second and third in class with its AF Corse-run 488 GTE Evos, James Calado putting the #51 machine just a tenth of a second ahead of Antonio Fuoco in the #52 car.
Corvette Racing's solo C8.R was fifth in class with Spa debutant Tommy Milner at the wheel.
An early lap of 2m15.604s from Matteo Cairoli was enough to top the GTE Am class for the Project 1 Porsche squad ahead of Seb Priaulx in the Dempsey-Proton Racing Porsche.
The session was halted with around seven minutes remaining owing to debris on track.
One more WEC practice session takes place at Spa on Friday afternoon at 2pm local time ahead of qualifying at 6.20pm.
WEC 6 Hours of Spa - FP2 results:
| Cla | # | Drivers | Car | Class | Time | Gap |
|---|---|---|---|---|---|---|
| 1 | 5 |
 Dane Cameron  Emmanuel Collard  Felipe Nasr | Oreca 07 | LMP2 | 2'04.443 | |
| 2 | 708 |
Olivier Pla Romain Dumas Pipo Derani | Glickenhaus 007 LMH | HYPERCAR | 2'04.464 | 0.021 |
| 3 | 8 |
 Sébastien Buemi  Brendon Hartley  Ryo Hirakawa | Toyota GR010 - Hybrid | HYPERCAR | 2'04.692 | 0.249 |
| 4 | 23 |
 Alex Lynn Oliver Jarvis Josh Pierson | Oreca 07 | LMP2 | 2'04.821 | 0.378 |
| 5 | 9 |
 Robert Kubica Louis Deletraz  Lorenzo Colombo | Oreca 07 | LMP2 | 2'05.020 | 0.577 |
| 6 | 7 |
Mike Conway Kamui Kobayashi  Jose Maria Lopez | Toyota GR010 - Hybrid | HYPERCAR | 2'05.128 | 0.685 |
| 7 | 22 |
Philip Hanson  Filipe Albuquerque Will Owen | Oreca 07 | LMP2 | 2'05.294 | 0.851 |
| 8 | 38 |
 Roberto Gonzalez Antonio Felix da Costa Will Stevens | Oreca 07 | LMP2 | 2'05.389 | 0.946 |
| 9 | 28 |
 Oliver Rasmussen  Ed Jones  Jonathan Aberdein | Oreca 07 | LMP2 | 2'05.450 | 1.007 |
| 10 | 36 |
Andre Negrao Nicolas Lapierre Matthieu Vaxiviere | Alpine A480 | HYPERCAR | 2'05.477 | 1.034 |
| 11 | 83 |
François Perrodo Nicklas Nielsen Alessio Rovera | Oreca 07 | LMP2 | 2'05.507 | 1.064 |
| 12 | 34 |
Jakub Smiechowski Alex Brundle Esteban Gutierrez | Oreca 07 | LMP2 | 2'05.710 | 1.267 |
| 13 | 45 |
Steven Thomas  James Allen  Rene Binder | Oreca 07 | LMP2 | 2'06.115 | 1.672 |
| 14 | 41 |
Rui Andrade Ferdinand Habsburg Norman Nato | Oreca 07 | LMP2 | 2'06.138 | 1.695 |
| 15 | 10 |
Nico Müller  Ryan Cullen Sébastien Bourdais | Oreca 07 | LMP2 | 2'06.312 | 1.869 |
| 16 | 31 |
 Sean Gelael  Robin Frijns  René Rast | Oreca 07 | LMP2 | 2'06.662 | 2.219 |
| 17 | 1 |
Lilou Wadoux Sébastien Ogier Charles Milesi | Oreca 07 | LMP2 | 2'08.565 | 4.122 |
| 18 | 35 |
Jean Baptiste Lahaye Matthieu Lahaye François Heriau | Oreca 07 | LMP2 | 2'09.086 | 4.643 |
| 19 | 92 |
Michael Christensen Kevin Estre | Porsche 911 RSR - 19 | LMGTE PRO | 2'14.366 | 9.923 |
| 20 | 51 |
Alessandro Pier Guidi James Calado | Ferrari 488 GTE EVO | LMGTE PRO | 2'14.967 | 10.524 |
| 21 | 52 |
 Miguel Molina Antonio Fuoco | Ferrari 488 GTE EVO | LMGTE PRO | 2'15.060 | 10.617 |
| 22 | 91 |
Gianmaria Bruni Richard Lietz | Porsche 911 RSR - 19 | LMGTE PRO | 2'15.222 | 10.779 |
| 23 | 64 |
Tommy Milner Nick Tandy | Chevrolet Corvette C8.R | LMGTE PRO | 2'15.576 | 11.133 |
| 24 | 46 |
Matteo Cairoli Mikkel Pedersen Nicolas Leutwiler | Porsche 911 RSR - 19 | LMGTE AM | 2'15.604 | 11.161 |
| 25 | 77 |
Christian Ried Sebastian Priaulx Harry Tincknell | Porsche 911 RSR - 19 | LMGTE AM | 2'16.240 | 11.797 |
| 26 | 60 |
Claudio Schiavoni Matteo Cressoni Giancarlo Fisichella | Ferrari 488 GTE EVO | LMGTE AM | 2'16.260 | 11.817 |
| 27 | 71 |
Franck Dezoteux Pierre Ragues Gabriel Aubry | Ferrari 488 GTE EVO | LMGTE AM | 2'16.486 | 12.043 |
| 28 | 86 |
Michael Wainwright Riccardo Pera Benjamin Barker | Porsche 911 RSR - 19 | LMGTE AM | 2'16.651 | 12.208 |
| 29 | 33 |
Ben Keating Henrique Chaves Jr. Marco Sorensen | Aston Martin Vantage AMR | LMGTE AM | 2'16.804 | 12.361 |
| 30 | 54 |
Thomas Flohr Francesco Castellacci Nick Cassidy | Ferrari 488 GTE EVO | LMGTE AM | 2'16.839 | 12.396 |
| 31 | 98 |
 Paul Dalla Lana David Pittard Nicki Thiim | Aston Martin Vantage AMR | LMGTE AM | 2'16.885 | 12.442 |
| 32 | 777 |
Satoshi Hoshino Tomonobu Fujii Charlie Fagg | Aston Martin Vantage AMR | LMGTE AM | 2'17.016 | 12.573 |
| 33 | 88 |
Fred Poordad Patrick Lindsey  Jan Heylen | Porsche 911 RSR - 19 | LMGTE AM | 2'17.361 | 12.918 |
| 34 | 85 |
Rahel Frey Michelle Gatting Sarah Bovy | Ferrari 488 GTE EVO | LMGTE AM | 2'17.377 | 12.934 |
| 35 | 21 |
Simon Mann Christoph Ulrich  Toni Vilander | Ferrari 488 GTE EVO | LMGTE AM | 2'17.674 | 13.231 |
| 36 | 44 |
 Miro Konopka Tijmen van der Helm Bent Viscaal | Oreca 07 | LMP2 | 2'17.744 | 13.301 |
| 37 | 56 |
Brendan Iribe Ollie Millroy Ben Barnicoat | Porsche 911 RSR - 19 | LMGTE AM | 2'17.998 | 13.555 |
| View full results | ||||||
