1983 - Charlotte 500 km

15 May 1983 - Charlotte Motor Speedway, USA

M. L. Speer & Ken Madren 4th in a Porsche 935 JLP-2, 4 laps behind the winning March 83G driven by Al Holbert and Jim Trueman

GTO - 1st

No.	Car	#	Class	Drivers	Entrant	Pos	Class	Grid	Notes
24	Porsche 935 JLP-2	009 00043	GTP	M. L. Speer (USA)/Ken Madren (USA)	Pegasus III Racing (USA)	4th	4th	9th	134 laps
9	Porsche 934	009 00030	GTO	Wayne Baker (USA)/Jim Mullen (USA)	Personalized Autohaus (USA)	5th	1st	8th	133 laps
91	Porsche 934	930 890 0014	GTO	Chester Vincentz (USA)/Dave White (USA)	Electrodyne (USA)	8th	4th	12th	132 laps
87	Porsche 911 Carrera RSR	911 460 0035	GTO	Jack Lewis (USA)/John Ashford (USA)	Bob Beasley	15th	7th	30th	122 laps
35	Porsche 911 Carrera RSR	911 460 9113	GTO	Al Leon (USA)/Wayne Pickering (USA)	Pegasus Racing	16th	8th	28th	122 laps
58	Porsche 924 Carrera GTR	WP0ZZZ93ZBS720011	GTU	Deborah Gregg (USA)/Kathy Rude (USA)	Brumos Racing (USA)	17th	5th	16th	121 laps - DNF
94	Porsche 914/6	914 043 1523	GTU	Bruce Jones (USA)/Fred Apgar (USA)	Bruce Jones	23rd	9th	35th	99 laps
34	Porsche 924 Carrera GTR		GTU	George Drolsom (USA)/Bill Johnson (USA)	Drolsom Racing (USA)	24th	10th	26th	96 laps
5	Porsche 935 K3/80	000 00013	GTP	Bob Akin (USA)/John O'Steen (USA)	Bob Akin Motor Racing (USA)	27th	7th	7th	92 laps
42	Porsche 911 S	119 220 830	GTU	Gary Wonzer (USA)	Gary Wonzer	39th	19th	37th	13 laps - DNF
64	Porsche 911 Carrera RSR		GTO	Ron Coupland (USA)	John Hulen (USA)	40th	13th	22nd	12 laps - DNF