1975 IMSA - round 10

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100 miles of Mid-America

Mid-America Raceway, Wentzville, Missouri, USA

Date: 20/7/1975
Track length: 4.598 m
Attendance:
Entries accepted: unknown
Starters: 32 (heat 1), 30 (heat 2)
Finishers: 21 (heat 1); 21 (heat 2)

Pole position: Gregg in 1.52,738 = 146,97 kmh
Fastest lap: Holbert in 1.51,85 (heat 1); Holbert in 1.51,75 (heat 2)

Distance: 2 heats of 100 miles
Average speed: 145,501 kmh (heat 1); 144,661 kmh (heat 2)
Weather: Very hot
Ruleset: IMSA GT
Car info: 1975 Cars

High temperatures in Ohio. Holbert beat Gregg and Haywood in the first heat; the trio had a great fight in the second heat until Haywood retired with transmission failure. After that, Gregg suffered a puncture, so Holbert won the second heat as well.

Heat 1

Pos Pos in class # Team / Entrant
Car- Engine Drivers, Nationality Engine
vol. (cc) Engine
Type Group Distance,
time Qualifying position Qualifying time Fastest lap Reason out,
remarks

1 1
Porsche Carrera RSR Al Holbert, USA
2994 B6 GTO 35 laps, 1:06.25,86 3 1.51,85

2 2 59 Brumos Porsche
Porsche Carrera RSR Peter Gregg, USA
2994 B6 GTO 35 laps, 1:06.30,631 1

3 3
Porsche Carrera RSR Hurley Haywood, USA
2994 B6 GTO 35 2?

4 4
Porsche Carrera RSR George Dyer, USA
2994 B6 GTO 35 4?

5 5
Porsche Carrera RSR John O'Steen, USA
2994 B6 GTO 35 6

6 6
Porsche Carrera RSR Bob Hagestad, USA
2994 B6 GTO 34 8

7 7
Porsche Carrera RSR Jim Busby, USA
2994 B6 GTO 34 7

8 8
Porsche Carrera RSR Roberto Quintanilla, MEX
2994 B6 GTO 33 11

9 1
Datsun 240Z Brad Frisselle, USA
ca. 2400 L6 GTU 32 13 2.00,54

10 2 Bob Sharp Racing
Datsun 240Z Bob Sharp, USA
ca. 2400 L6 GTU 32 14

11 9
Chevrolet Camaro Joe Chamberlain, USA
V8 GTO 32 15

12 3
Porsche 911 S Dave Causey, USA
B6 GTU 31 23

13 10
Chevrolet Corvette Dick Durant, USA
V8 GTO 31 19

14 4
VW-Porsche 914/6 Leonard Jones, USA
1991 B6 GTU 31 26

15 5
Porsche 911 S George Drolsom, USA
B6 GTU 31 24

16 11
Ford Mustang Dave Mroz, USA
V8 GTO 30 22

17 6
Porsche 911 S Raymond Mummery, USA
B6 GTU 30 25

18 12
Chevrolet Monza Tom Nehl, USA
V8 GTO 30 17

19 7
Mazda Savanna RX-3 Raymond Walle, USA
2 x 491 R2 GTU 29 27

20 13
Chevrolet Corvette Jim Moyer, USA
V8 GTO 29 33

21 14
Chevrolet Corvette Phil Currin, USA
V8 GTO 27 18

DNF 15
Jaguar E-Type Glenn Bunch, USA
V12? GTO 22 32

DNF 8
Datsun 240Z Bob Speakman, USA
ca. 2400 L6 GTU 20 21

DNF 9
Porsche 911 Tom Masterton, USA
B6 GTU 18 20

DNF 16
Porsche Carrera RSR Michael Keyser, USA
2994 B6 GTO 17 10

DNF 17
Chevrolet Vega Stephen Bond, USA
V8? GTO 13 30?

DNF 18
Chevrolet Corvette Tony De Lorenzo, USA
V8 GTO 7 16

DNF 19 3
Chevrolet Monza Horst Kwech, USA
V8 GTO 6 5

DNF 20
Chevrolet Camaro Maurice Carter, CDN
V8 GTO 5 12

DNF 21
Chevrolet Camaro Juan Olivera
V8 GTO 4 34

DNF 22
Chevrolet Camaro Carl Shafer, USA
V8 GTO 2 9

DNF 23
Porsche Carrera RSR John McClelland
2994 B6 GTO 1 30?

Heat 2

Pos Pos in class # Team / Entrant
Car- Engine Drivers, Nationality Engine
vol. (cc) Engine
Type Group Distance,
time Qualifying position Qualifying time Fastest lap Reason out,
remarks

1 1
Porsche Carrera RSR Al Holbert, USA
2994 B6 GTO 35 laps, 1:06.48,99 1.51,75

2 2 59 Brumos Porsche
Porsche Carrera RSR Peter Gregg, USA
2994 B6 GTO 35 laps, 1:07.44,07

3 3
Porsche Carrera RSR John O'Steen, USA
2994 B6 GTO 35

4 4
Porsche Carrera RSR Roberto Quintanilla, MEX
2994 B6 GTO 35

5 5
Chevrolet Camaro Carl Shafer, USA
V8 GTO 34

6 6
Porsche Carrera RSR Bob Hagestad, USA
2994 B6 GTO 34

7 7
Porsche Carrera RSR Jim Busby, USA
2994 B6 GTO 34

8 8
Chevrolet Corvette Tony De Lorenzo, USA
V8 GTO 33

9 9
Chevrolet Corvette Richard Ortman, USA
V8 GTO 32

10 1 Bob Sharp Racing
Datsun 240Z Bob Sharp, USA
ca. 2400 L6 GTU 32 2.01,57

11 10
Chevrolet Monza Tom Nehl, USA
V8 GTO 32

12 11
Chevrolet Corvette Phil Currin, USA
V8 GTO 31

13 12
Chevrolet Corvette Dick Durant, USA
V8 GTO 31

14 2
VW-Porsche 914/6 Leonard Jones, USA
1991 B6 GTU 31

15 3
Porsche 911 S George Drolsom, USA
B6 GTU 31

16 13
Ford Mustang Dave Mroz, USA
V8 GTO 31

17 4
Porsche 911 S Raymond Mummery, USA
B6 GTU 30

18 5
Porsche 911 S Don Parish, USA
B6 GTU 30

19 6
Datsun 240Z Bob Speakman, USA
ca. 2400 L6 GTU 25

20 14
Chevrolet Camaro Joe Chamberlain, USA
V8 GTO 25

DNF 15
Chevrolet Vega Stephen Bond, USA
V8? GTO 24

22 7
Porsche 911 Tom Masterton, USA
B6 GTU 20

DNF 16
Porsche Carrera RSR George Dyer, USA
2994 B6 GTO 16

DNF 17
Chevrolet Camaro Maurice Carter, CDN
V8 GTO 10

DNF 18
Porsche Carrera RSR Hurley Haywood, USA
2994 B6 GTO 7 Transmission

DNF 19
Porsche Carrera RSR Michael Keyser, USA
2994 B6 GTO 7

DNF 20
Chevrolet Monza Horst Kwech, USA
V8 GTO 4

DNF 8
Mazda Savanna RX-3 Raymond Walle, USA
2 x 491 R2 GTU 2

DNF 9
Datsun 240Z Brad Frisselle, USA
ca. 2400 L6 GTU 1

DNF 21
Chevrolet Camaro Juan Olivera
V8 GTO

Heat 1
Pos	Pos in class	#	Team / Entrant Car- Engine	Drivers, Nationality	Engine vol. (cc)	Engine Type	Group	Distance, time	Qualifying position	Qualifying time	Fastest lap	Reason out, remarks
1	1		Porsche Carrera RSR	Al Holbert, USA	2994	B6	GTO	35 laps, 1:06.25,86	3		1.51,85
2	2	59	Brumos Porsche Porsche Carrera RSR	Peter Gregg, USA	2994	B6	GTO	35 laps, 1:06.30,631	1
3	3		Porsche Carrera RSR	Hurley Haywood, USA	2994	B6	GTO	35	2?
4	4		Porsche Carrera RSR	George Dyer, USA	2994	B6	GTO	35	4?
5	5		Porsche Carrera RSR	John O'Steen, USA	2994	B6	GTO	35	6
6	6		Porsche Carrera RSR	Bob Hagestad, USA	2994	B6	GTO	34	8
7	7		Porsche Carrera RSR	Jim Busby, USA	2994	B6	GTO	34	7
8	8		Porsche Carrera RSR	Roberto Quintanilla, MEX	2994	B6	GTO	33	11
9	1		Datsun 240Z	Brad Frisselle, USA	ca. 2400	L6	GTU	32	13		2.00,54
10	2		Bob Sharp Racing Datsun 240Z	Bob Sharp, USA	ca. 2400	L6	GTU	32	14
11	9		Chevrolet Camaro	Joe Chamberlain, USA		V8	GTO	32	15
12	3		Porsche 911 S	Dave Causey, USA		B6	GTU	31	23
13	10		Chevrolet Corvette	Dick Durant, USA		V8	GTO	31	19
14	4		VW-Porsche 914/6	Leonard Jones, USA	1991	B6	GTU	31	26
15	5		Porsche 911 S	George Drolsom, USA		B6	GTU	31	24
16	11		Ford Mustang	Dave Mroz, USA		V8	GTO	30	22
17	6		Porsche 911 S	Raymond Mummery, USA		B6	GTU	30	25
18	12		Chevrolet Monza	Tom Nehl, USA		V8	GTO	30	17
19	7		Mazda Savanna RX-3	Raymond Walle, USA	2 x 491	R2	GTU	29	27
20	13		Chevrolet Corvette	Jim Moyer, USA		V8	GTO	29	33
21	14		Chevrolet Corvette	Phil Currin, USA		V8	GTO	27	18
DNF	15		Jaguar E-Type	Glenn Bunch, USA		V12?	GTO	22	32
DNF	8		Datsun 240Z	Bob Speakman, USA	ca. 2400	L6	GTU	20	21
DNF	9		Porsche 911	Tom Masterton, USA		B6	GTU	18	20
DNF	16		Porsche Carrera RSR	Michael Keyser, USA	2994	B6	GTO	17	10
DNF	17		Chevrolet Vega	Stephen Bond, USA		V8?	GTO	13	30?
DNF	18		Chevrolet Corvette	Tony De Lorenzo, USA		V8	GTO	7	16
DNF	19	3	Chevrolet Monza	Horst Kwech, USA		V8	GTO	6	5
DNF	20		Chevrolet Camaro	Maurice Carter, CDN		V8	GTO	5	12
DNF	21		Chevrolet Camaro	Juan Olivera		V8	GTO	4	34
DNF	22		Chevrolet Camaro	Carl Shafer, USA		V8	GTO	2	9
DNF	23		Porsche Carrera RSR	John McClelland	2994	B6	GTO	1	30?