Published on: Feb 9, 2016 @ 17:35 Originally Published in: 2015 (old website) (C) Jay Auger - website owner & author Notice: Any form of duplication methods (including but not limited to copy/paste of text and screen capture) of the website's content is strictly forbidden.
During the short-lived Group B era, Subaru focused its official rallying ambitions in Group A with the Leone and later with the RX Turbo. However, Subaru would homologate two cars into Group B; the 2nd generation MP-1 Utility and later on the XT 1.8 Turbo. With large enough production numbers, it is safe to assume that the FISA regulations on the minimal interior space for Group A is why these two cars were homologated in Group B instead. Group B itself was divided into multiple classes pertaining to engine displacement, giving smaller engine / low horsepower cars a chance to clinch their respective class honours instead of going for the impossible overall win.
The MP-1 Utility is known to have made two appearances in the WRC New Zealand Rally; driven both times by privateer Ron Shapley, the car managed a respectable 23rd (1985) and 35th (1986) overall place finish. However, the car was competing in the B/11 class (for engines between 1599~1999 cc), managing a 4th (1985) and 2nd (1986) class place finish.
Very little is known about the specs of the MP-1 rally car other than it was running in the B/11 class. However, this gives an important clue as it confirms the homologation papers stating that the car used the normally aspirated “EA-81S” 1781 cc unit instead of the turbocharged version that was also available at the time (which would have put it in the B/12 class with the x1.4 forced induction factor).
In twin carburetor form, the EA-81 engine was known to be able to produce around 100 HP / 90 TQ. It is safe to assume that the rally car was using that configuration and made around that amount of power. A longer ratio 1.950 second gear was also used on the rally car. Other than a basic aluminium roll cage, the rest of the car remained stock, featuring all steel body panels and normal safety glass.
|Group/Class||B/11||Homologation number: B-259 (click # for the papers)|
|Type||EA-81S, H-4, OHV 8 valves, gas||front, longitudinal|
|Displacement||1781 cc||WRC = 1781 cc|
|Output power – torque||
|Materials||block: aluminium||cylinder head: aluminium|
|Lubrication system||wet sump||N/A|
|Type||four wheel drive||4 speed manual|
|Differential ratios||3.70||single/dual range transfer case|
|Clutch||single plate, mechanical|
|Type||Leone-based steel monocoque chassis with roll cage, 2 door “coupe utility” steel bodyshell|
|Front suspension||McPherson struts, coil springs, wishbone, anti-roll bar|
|Rear suspension||semi-trailing arm, torsion bar|
|Steering system||rack & pinion||18.5:1 (3.8 turns lock to lock)|
||dual circuit, hydraulic|
|length: 4415 mm (173.8 in)||width: 1635 mm (64.4 in)||height: 1430 mm (56.3 in)|
|wheelbase: 2445 mm (96.3 in)||front track: 1265 mm (49.8 in)||rear track: 1250 mm (49.2 in)|
|Rims – tires||
|Curb Weight||935 kg (2060 lb)|
|Fuel tank||55 litres|
HOMOLOGATION / PRODUCTION VERSION
While the Group B homologation is under the “MP-1” name, this quirky coupe utility by Subaru is also known under various names; 284, Brat, Brumby, MV, MPV, Shifter, and Targa. A very far cry away from being an homologation special (which it obviously isn’t) the car was produced from 1978 to 1994 thus carries a wide range of specifications: CLICK HERE.
(C) Articles by Jay Auger – website owner & author
- All homologation papers are the property of the Fédération Internationale de l’Automobile (FIA): SOURCE
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