The 1998 Superflo 12 Hours of Sebring was the 46th running of the 12 Hours of Sebring. It also served as the inaugural round of the 1998 IMSA GT Championship season. It took place at Sebring International Raceway, Florida, on March 22, 1998.

Race results

Class winners in bold.

Pos	Class	No	Team	Drivers	Chassis	Tyre	Laps
					Engine
1	WSC	30	MOMO Doran Racing	Didier Theys Mauro Baldi Gianpiero Moretti	Ferrari 333 SP	Y	319
					Ferrari F310E 4.0 L V12
2	GT1	4	Panoz Motorsports	Andy Wallace David Brabham	Panoz GTR-1	M	318
					Ford (Roush) 6.0 L V8
3	GT1	74	Champion Motors	Thierry Boutsen Bob Wollek Andy Pilgrim	Porsche 911 GT1	M	318
					Porsche 3.2 L Turbo Flat-6
4	GT1	5	Panoz Motorsports	Éric Bernard Jamie Davies Doc Bundy	Panoz GTR-1	M	312
					Ford (Roush) 6.0 L V8
5	GT2	66	Konrad Racing	Nick Ham Franz Konrad	Porsche 911 GT2	M	300
					Porsche 3.6 L Turbo Flat-6
6 DNF	WSC	7	Doyle-Risi Racing	Wayne Taylor Eric van de Poele Fermín Vélez	Ferrari 333 SP	P	298
					Ferrari F310E 4.0 L V12
7	GT2	65	Saleen Allen Speedlab	Steve Saleen Ron Johnson Tommy Archer	Saleen Mustang SR	?	297
					Ford 5.9 L V8
8	GT1	91	Rock Valley Racing	John Heinricy Stu Hayner Roger Schramm	Chevrolet Camaro	G	297
					Chevrolet V8
9	GT2	04	C.J. Motorsports	John Morton John Graham Ron Fellows	Porsche 911 GT2	G	296
					Porsche 3.6 L Turbo Flat-6
10	GT2	99	Larry Schumacher	Robert Nearn John O'Steen Larry Schumacher	Porsche 911 GT2	P	296
					Porsche 3.6 L Turbo Flat-6
11	GT3	10	Prototype Technology Group	Bill Auberlen Boris Said	BMW M3	Y	295
					BMW 3.2 L I6
12	GT3	6	Prototype Technology Group	Peter Cunningham Ross Bentley Mark Simo	BMW M3	Y	293
					BMW 3.2 L I6
13	WSC	20	Dyson Racing	Dorsey Schroeder Butch Leitzinger James Weaver Elliott Forbes-Robinson	Riley & Scott Mk III	G	290
					Ford 5.0 L V8
14	GT3	23	Alex Job Racing	Charles Slater Cort Wagner Darryl Havens	Porsche 911 Carrera RSR	P	286
					Porsche 3.8 L Flat-6
15	GT3	07	G & W Motorsports	Patrick Huisman Danny Marshall Steve Marshall Darren Law	Porsche 993	P	285
					Porsche 3.8 L Flat-6
16	GT3	76	Team A.R.E.	John Ruther Jake Vargo Nick Anegelos Peter Argetsinger	Porsche 993 Carrera RSR	Y	283
					Porsche 3.8 L Flat-6
17	WSC	95	TRV Motorsport	Jeret Schroeder Tom Volk Lyn St. James	Kudzu DL-4	G	283
					Chevrolet 6.0 L V8
18	GT3	24	Tim Vargo	Jack Refenning Tim Vargo Josh Vargo Brady Refenning	Porsche 911 Carrera RSR	P	277
					Porsche 3.8 L Flat-6
19	GT3	25	Alex Job Racing	Charles Slater Don Kitch Angelo Cilli Dale White Michael Peterson	Porsche 911 Carrera RSR	P	268
					Porsche 3.8 L Flat-6
20	GT1	2	Mosler Automotive	Shane Lewis Vic Rice Tom Reese	Mosler Raptor	P	263
					Chevrolet 6.3 L V8
21	GT3	96	Olive Garden Racing	Kevin Wheeler Mike Davies Ron Zitza	Porsche 911 Carrera RSR	P	259
					Porsche 3.8 L Flat-6
22	GT1	71	Art Pilla	Arthur Pilla Oma Kimbrough David Kitchak	Porsche 911 GT2	?	253
					Porsche 3.6 L Turbo Flat-6
23 DNF	GT3	46	Bill Radar	Max Schmidt Chris Bingham	Porsche 911 Carrera RSR	P	249
					Porsche 3.8 L Flat-6
24 DNF	WSC	39	Matthews-Colucci Racing	David Murry Hurley Haywood Derek Bell Jim Matthews	Riley & Scott Mk III	P	247
					Ford 5.0 L V8
25	GT3	32	Phoenix Motorsports	Don Knowles Jim Michaelian Jim McNeely John Heinricy	Pontiac Firebird	T	246
					Pontiac V8
26	WSC	12	Genesis Racing	Chuck Goldsborough Michael DeFontes Mark Neuhaus Rick Fairbanks	Hawk MD3R	G	244
					Mazda 2.0 L 3-Rotor
27 DNF	GT3	68	The Racer's Group	Stephen Earle Philip Collin Kevin Buckler	Porsche 911 Carrera RSR	?	242
					Porsche 3.8 L Flat-6
28 DNF	GT1	11	Robinson Racing	Jack Baldwin Irv Hoerr George Robinson	Oldsmobile Aurora GTS-1	?	235
					Oldsmobile 4.0 L V8
29 DNF	GT3	55	AASCO Performance	Tim Ralston Kelly Collins Jorge Trejos	Porsche 911 Carrera RSR	P	232
					Porsche 3.8 L Flat-6
30 DNF	WSC	28	Intersport Racing	Jon Field Butch Brickell Rick Sutherland	Riley & Scott Mk III	G	173
					Ford 5.0 L V8
31 DNF	GT2	77	Konrad Motorsport	Wido Rössler Peter Kitchak Matt Turner	Porsche 911 GT2	D	170
					Porsche 3.6 L Turbo Flat-6
32 DNF	GT3	1	Prototype Technology Group	Craig Carter Andy Petery Giovanna Amati	BMW M3	Y	170
					BMW 3.2 L I6
33 DNF	GT2	01	Rohr	Sylvain Tremblay Martin Snow Jochen Rohr	Porsche 911 GT2	P	160
					Porsche 3.6 L Turbo Flat-6
34 DNF	GT2	38	Mark Hein	Mark Hein Gary Blackman John Green Pete Halsmer	Acura NSX	G	159
					Acura 3.2 L V6
35 DNF	GT1	87	John Annis	John Annis Lee Hill Randy Pobst Mick Robinson	Chevrolet Camaro	?	152
					Chevrolet V8
36 DNF	WSC	8	Transatlantic Racing Services	Johnny O'Connell Henry Camferdam Scott Schubot	Riley & Scott Mk III	D	130
					Ford 5.0 L V8
37 DNF	WSC	59	Intersport Racing	Alex Smith Simon Gregg Joaquin DeSoto John Mirro	Spice SC95	G	129
					Oldsmobile Aurora 4.0 L V8
38 DNF	GT3	54	Bell Motorsports	Terry Borcheller Carlos DeQuesada Scott Neuman Joe Varde	BMW M3	Y	125
					BMW 3.2 L I6
39 DNF	GT3	93	Team Ecuador	Henry Taleb Rino Mastronardi	Nissan 240SX	Y	95
					Nissan 2.4 L I4
40 DNF	GT3	57	Kryderacing	Luis Sereix Frank Del Vecchio Reed Kryder	Nissan 240SX	?	42
					Nissan 2.4 L I4
41 DNF	WSC	63	Downing Atlanta	Jim Pace Yojiro Terada Jim Downing	Kudzu DLM	G	36
					Mazda 2.0 L 3-Rotor
42 DNF	GT3	86	First Union	Darren Law Steve Pfeffer Mike Fitzgerald	Porsche 993	?	34
					Porsche 3.8 L Flat-6
43 DNF	GT3	67	The Racer's Group	Peter Baron Dennis O'Keefe Steve Pelke	Porsche 911 Carrera RSR	?	24
					Porsche 3.8L Flat-6
44 DNF	GT2	15	Jon Lewis	Bill Eagle Dorsey Schroeder	Vector M12	G	16
					Lamborghini 5.7 L V12
45 DNF	WSC	16	Dyson Racing	James Weaver Elliott Forbes-Robinson Butch Leitzinger	Riley & Scott Mk III	G	7
					Ford 5.0L V8
46 DNF	GT2	69	Gustl Spreng	Gustl Spreng Kersten Jodexnis Ray Mummery	Porsche 993 Carrera Turbo	Y	6
					Porsche 3.6 L Turbo Flat-6
47 DNF	GT3	33	Phoenix Racing	Steve McNeely Jim Michealian Joe Aquilante	Pontiac Firebird	?	4
					Pontiac V8
48 DNF	GT1	3	Greg Malvaso	Jerry Kinn Chuck Singletary Gerre Payvis	Chevrolet Camaro	?	0
					Chevrolet V8

Statistics

• Pole Position - #7 Doyle-Risi Racing - 1:55.052
• Average Speed - 158.208 km/h (98.306 mph)