The privateer Rebellion and ByKolles teams outpaced Toyota in opening free practice for Saturday's World Endurance Championship round at Spa.
Norman Nato topped the times with a 2m02.469s set early in the 90-minute session aboard the solo Rebellion-Gibson R-13 he shares with Bruno Senna and Gustavo Menezes.
That gave him a margin of just over a second ahead of the ByKolles team's ENSO CLM-Gibson P1/01 in which Oliver Webb posted a 2m03.515s.
The best of the Toyota TS050 HYBRIDs was the #7 entry which is running the greater penalty under the system of success handicaps introduced in LMP1 for the 2019/20 WEC.
Mike Conway set a 2m03.632s to end up a couple of tenths up on Kazuki Nakajima's 2m03.824s in the sister #8 car.
The class-leading Toyota's 1.1s deficit to the Rebellion is significantly less than the near two-second differential in the success handicaps they are carrying for the sixth round of the WEC.
The #7 and #8 Toyotas are penalised by 3.52s and 3.08s respectively, while the Rebellion is running a 1.58s handicap.
ByKolles, which has a revised version of its Le Mans bodywork in Belgium, is forced to run the same penalty as the Rebellion because it is making its seasonal debut in the WEC.
Toyota is debuting the Le Mans-spec version of the new high-nose aerodynamics introduced on the TS050 this year, whereas the Rebellion is in high-downforce trim.
The Racing Team Nederland Dallara-Gibson P217 was fastest in LMP2 with Giedo van der Garde at the wheel. The Dutchman posted 2m03.888s to eclipse Anthony Davidson's 2m03.935s aboard the Jota Sport ORECA.
Third fastest in class was the United Autosports ORECA in which championship leader Phil Hanson set a 2m04.119s.
The two factory Porsche 911 RSRs blocked out the top two positions in GTE Pro for the majority of the session, Michael Christensen leading the way on 2m16.057s.
Maxime Martin put in a 2m16.308s right at the end of the 90 minutes in his Aston Martin Vantage GTE to eclipse the 2m16.349s set early on by Gianmaria Bruni in the second of the Porsches.
Alessandro Pier Guidi was the best-placed Ferrari driver in fourth with a 2m16.779s.
Fellow factory driver Nicklas Nielsen ended up fastest in GTE AM with the AF Corse Ferrari squad.
The Dane's 2m17.853s put him a couple of tenths up on Augusto Farfus in the factory-run Aston Martin GTE Am entry.
Jackie Chan DC Racing driver Gabriel Aubry did not take part in the session after testing positive for COVID-19 on Wednesday.
The results of a second test will determine whether he can race the Jota-run ORECA P2 car.
The Algarve Pro ORECA remained in its garage throughout the session.
The Anglo-Portuguese team has been forced to self-isolate because Aubry drove one of its cars in last weekend's European Le Mans Series round at Spa.
It remains unclear whether it will be able to run its solo ORECA P2 car on Friday.
|1||LMP1||B.Senna, G.Menezes, N.Nato||Rebellion Racing||Rebellion/Gibson||2m02.469s|
|2||LMP1||T.Dillmann, B.Spengler, O.Webb||ByKOLLES Racing Team||ENSO CLM/Gibson||1.046s|
|3||LMP1||M.Conway, K.Kobayashi, J.M.Lopez||Toyota Gazoo Racing||Toyota||1.163s|
|4||LMP1||S.Buemi, K.Nakajima, B.Hartley||Toyota Gazoo Racing||Toyota||1.355s|
|5||LMP2||F.van Eerd, G.van der Garde, J.van Uitert||Racing Team Nederland||ORECA/Gibson||1.419s|
|6||LMP2||R.Gonzalez, A.F.da Costa, A.Davidson||JOTA||ORECA/Gibson||1.466s|
|7||LMP2||P.Hanson, F.Albuquerque, P.Di Resta||United Autosports||ORECA/Gibson||1.650s|
|8||LMP2||T.Laurent, A.Negrao, P.Ragues||Signatech Alpine Elf||Alpine/Gibson||1.712s|
|9||LMP2||N.Lapierre, A.Borga, A.Coigny||COOL Racing||ORECA/Gibson||1.842s|
|10||LMP2||H-Pin Tung, R.Cullen, W.Stevens||Jackie Chan DC Racing||ORECA/Gibson||2.063s|
|11||LMP2||M.Patterson, K.Yamashita, A.Fjordbach||High Class Racing||ORECA/Gibson||3.578s|
|12||LMP2||N.Yamanaka, N.Foster, R.Merhi||Eurasia Motorsport||Ligier/Gibson||4.127s|
|13||LMP2||R.Lacorte, A.Belicchi, G.Sernagiotto||Cetilar Racing||Dallara/Gibson||4.742s|
|14||GTE Pro||M.Christensen, K.Estre||Porsche GT Team||Porsche||13.588s|
|15||GTE Pro||A.Lynn, M.Martin||Aston Martin Racing||Aston Martin||13.839s|
|16||GTE Pro||G.Bruni, R.Lietz||Porsche GT Team||Porsche||13.880s|
|17||GTE Pro||J.Calado, A.P.Guidi||AF Corse||Ferrari||14.310s|
|18||GTE Pro||D.Rigon, M.Molina||AF Corse||Ferrari||14.653s|
|19||GTE Pro||M.Sorensen, N.Thiim||Aston Martin Racing||Aston Martin||14.719s|
|20||GTE Am||F.Perrodo, E.Collard, N.Nielsen||AF Corse||Ferrari||15.384s|
|21||GTE Am||P.D.Lana, A.Farfus, R.Gunn||Aston Martin Racing||Aston Martin||15.551s|
|22||GTE Am||E.Perfetti, L.Horr, M.Cairoli||Team Project 1||Porsche||15.713s|
|23||GTE Am||C.Ried, R.Pera, M.Campbell||Dempsey-Proton Racing||Porsche||15.778s|
|24||GTE Am||M.Wainwright, A.Watson, B.Barker||Gulf Racing||Porsche||16.053s|
|25||GTE Am||T.Flohr, F.Castellacci, G.Fisichella||AF Corse||Ferrari||16.064s|
|26||GTE Am||S.Yoluc, C.Eastwood, J.Adam||TF Sport||Aston Martin||16.106s|
|27||GTE Am||B.Keating, F.Fraga, J.Bleekemolen||Team Project 1||Porsche||16.929s|
|28||GTE Am||B.Grimes, J.Mowlem, C.Hollings||Red River Sport||Ferrari||17.242s|
|29||GTE Am||G.Giraudi, R.Sanchez, L.Legeret||Dempsey-Proton Racing||Porsche||17.392s|
|30||LMP2||J.Falb, S.Trummer, J.Lancaster||Algarve Pro Racing||ORECA/Gibson||-|