Technical Information Summary

Final revision - V6 Standard Spec (1997):

Traction Control
Heated Leather (black standard/cream option)
White 'vision' Dials
Battery/Oil VDO centre-gauge set
V6 brakes
V6 Suspension
Twin airbags
Fuel Computer
Blaupunkt CD Player
Integral foglights
Key Activated Central - Locking w/ deadlocks
(Thatcham Cat2)

turbo and V6 are
20 mm (?) lower than 8v/16v models



bore diam : 81.6mm / 3.21"
stroke : 79.6 mm / 3.13"
piston disp: 2498 cm3 /  152.4 cu in
compression ratio  10.8:1





Length: 14'9" (449.2 cm)
Width: 5'7"(168.8 cm)
Height: 4'4"(132 cm)
Weight: 1370 kg

fuel tank capacity: 63 litres
boot load capacity (rear seats up/down): 300/980 litres (10.6/34.6 cu/ft)
V6 drag co-efficient : Cd 0.29
V6 turning circle : 10.6m/34.8ft (2.9 turns to lock)
C25XE Ecotec
2498cc - 24 valve - 6 Cylinder
Multipoint (sequential) Fuel Injection
Quad Camshafts
Catalytic Converter
Bosch Motronic 2.8 ECU

front wheel drive
bhp @ 6000 rpm
167.4 ft/llbs torque @ 4200 rpm
148 mph max
0-60 mph in 7.3 sec (0-100 kph in 7.8 sec)
0-7000 revs - 6750 redline limited
24 mpg urban / 36 mpg m'tway

ins group : 16-17

> Calibra Wheel Alignment Table <

 > V6 Gearbox Transmission Ratio Table <

V6 Cooling Fan (366mm diam, 5 blade)
V6 Thermo Switch (on radiator)
  on at 100 deg C
  off at 95 deg C
V6 Thermostat (bypass regulator type)
  start to open @ 92 deg C
  fully open @ 107 deg C

V6 Coolant System Capacity
  7.5 Litres

V6 Oil System Capacity
  4.5 Litres (for refill purposes w/ new filter)
  5.5 Litres (true total capacity)

V6 Fuel Tank Capacity
  63 Litres

V6 Standard Battery
  66Ah rated

V6 Oil Pressure:
Theoretical 1.2 bar when
rpm = 700-800 (idle) and new oil temp > 80 deg C
in real-life it won't be this low on the gauge, more like 3 to 3.5 is normal once engine is warm

V6 Bosch Fuel Pump
85 ltrs/hr @ 12v (3.0 to 3.5 bar)
Fuel System Pressure = 3.0 bar nominal
early V6's pump located outside tank
late V6's pump located in tank

V6 Injectors
Bosch, Type 0-280-150-428
Flow = 196 to 220 cc/min @ 3 bar (100% duty cycle)
Impedance = 16 ohm
BHP rating (each inj) = 26-34 bhp (42 peak)
6 injectors combined flow rate : 70 to 79 ltrs/hr

C25XE Cams
Inlet : Type A (green band)
Exhaust : Type A (green band)

C25XE Cam belt (toothed belt)
width: 30mm
no of teeth : 225

C25XE Ancillary belt (ribbed V belt)
length (with a/c): 2260mm
length (without) : 1900mm
width : 20mm

V6 Std Plugs
twin electrode

V6 Std Alternator
100 amps (Bosch - 4 Types) - for a/c equipped
70 amps (Delco-Remy - 1 type) - non a/c
120 amp Bosch alternators fitted to some late V6 models with a/c (these are slightly larger in size than 100 amp alternators)

V6 Steering System
Hydraulic Power assisted rack & pinion system. Range: 2.9 turns to lock.  

V6 Std Suspension
V6 suspension uses V6 specific springs with standard calibra shocks. Ride height is 20mm lower than standard 16v model.
FRONT: Independent McPherson struts with linear rate coil springs and gas pressure dampers. Anti roll bar.
REAR : Independent with semi trailing arms, progressive rate mini block springs with gas pressure dampers. Anti roll bar.

V6 Braking System
FRONT: 288mm vented discs (early V6's used 284mm)
REAR: 270mm solid discs with integral hand brake (shoe type )

V6 Std Wheels and Tyre
15" 'F-Line' 5 spoke alloy wheels
five stud, ECD = 110mm, ET 49
205/55 R15 Tyres

V6 Transmission System
5 speed manual F25 gearbox: 228mm clutch
rated to 250bhp
4 speed auto: this was an extra cost option with transmission fluid cooling integrated into the main cooling system. Uses fluid drive with torque converter. Auto transmission system ties into Motronic ECU. Economy, sport and winter driving modes.

V6 Traction Control System
Manufactured and supplied by 'Hella' for Opel.
Works through the front ABS brake sensors (wheel speed sensors). When active the TC automatically cuts in when any slippage of front tyres detected. It monitors differential wheel speeds. The TC cuts power by closing the air inlet tract using a secondary solenoid valve (traction control solenoid/motor). The system is switched off using the TC button. When the system is de-activated the TC warning light is ON - to warn you that a safety system has been intentionally deactivated.

ABS System
The Anti-lock Braking System. Type ABS-2EH.  ABS ECU and hydraulic modulator valve assembly are one integral unit mounted under the bonnet. A slightly modified version was installed from '96 on. Essentially identical to previous except improved hydraulic modulator valves used internally.



some useless V6 facts: 

The C25XE engines were built in the UK. Calibra V6's were mostly assembled in Finland - at Valmet Automotive car factory in Uusikaupunki.

Some late model V6's used a few Vectra V6 parts here and there (including brakes and on rare occasions (starting in December 1996) an X25XE Vectra V6 short block engine. No real difference other than the X25XE block runs with a higher oil pressure due to using a larger diameter oil pump rotor. The oil pathways are larger in the X25XE block; this is intended to support the new flat based tappets (less noisy on start up) in Vectra heads. However as all V6 Calibra's use the same heads (regardless of block type) these benefits are not seen.

'S' plate calibra's were built in early 1998 (final production) but stored and then registered throughout late '98 and into '99.

ECOTEC is a marketing term and stands for "Economy, Ecology and Technology. In the case of the V6 C25XE engine all the manufacturer effectively did was stick 'Ecotec' on the engine cover mid 1995 (engine cover also changed colour from red to black). A secondary air injection system was also added to the Ecotec.
For the 2.0l 16v engines this issue was more complex and involved engine design changes which handicapped its' peak bhp. Hence the term 'weak-o-tec' and the preference for the 'red top' 16v engine.

The Saab 900 and early 9-3 models used the same chassis, engine and F25 gearbox as the V6 Calibra. Saab 9-3 convertibles were assembled on the same production line at Valmet Automotive in Finland.
It is feasible to make use of the Saab V6 low pressure turbo fitted to some 9-3 V6's but there is a severe lack of room in the Calibra engine bay to make this a practical modification - especially for the front exhaust manifold mounted turbo.

With turbocharged engines banned from ITC, the Opel Race Team used a highly tuned V6 engine with 4x4 chassis for the Class 1 Calibra touring car. Producing 500 bhp and revving to11500 rpm it approached a 200 mph top speed.

From 95 on interior leather was standard equipment on the V6. Standard colour was black (anthracite) but cream leather could be selected as a no cost option change by the new owner. Cloth interiors were a 'reduced cost' option which actually reduced the standard cost of a V6 by a few hundred quid. Popular request with company lease and agency hire cars.

V6 Regional Coding Plug - Often mistaken for a Fuel Octane Plug but it isn't. Located in the upper right corner of the engine bay (near the diagnostic socket). A small brown plastic plug. Changing this plug round from A to B will increase the target idle rpm by 100 (from 700 to 800); other effects of changing this from A to B have been debated on the clubcalibra forums. If there are any gains to be made swapping this plug around then they are subtle.
All V6 calibra's have twin knock sensors to accurately tune the engine for different fuel octane ratings. This is why an octane plug is not required on this model. 

Indicators - If you leave your indicators on and turn off your ignition you may notice that your offside side light remains illuminated, even with the key is removed. This is intentional by design; it's supposed to be a 'safety design feature'. If you didn't happen to notice this then it could lead to a flat battery if the vehicle is left like this for a long period.


Calibra V6 History

Year V6 Manufactured:
Oct 1993 "L" to Aug1998 "R"
some late registered on "S" plate (rare)

Engine Configuration:
V6 24 valve unit with two overhead camshafts per cylinder bank. Alloy cylinder heads, hydraulic tappets, electric cooling fan, booster cooling fan (ac), alternator cooling fan, oil/water heat exchanger located in cylinder "V". Main mechanical water pump, auxiliary electric water pump. Main toothed cam belt (also drives oil pump) Ancillary ribbed v-belt drives alternator, water pump, power steering and air con comp.

Engine Management:
Bosch Motronic M2.8 'learning' system. Sequential port fuel injection with air mass metering and dual spray injector valves. Computer controlled direct ignition system with dual spark coils and selective knock control.

Emission Control:
Electronically controlled Secondary air injection. Activated charcoal evaporation control canister. Single lambda sensor and three way, closed loop, metallic monolith catalytic converter.

Safety Systems:
ABS + switchable Traction Control
Twin airbags
Twin side impact bars and front/rear crumple zones
Front pre-tensioned seatbelt 'body-lock' system

Standard equipment revisions for V6:
Steel clutch release lever replaced by cast ion version - 94 >
"V"- Grill Added, bonnet badge removed - 95 >
Rear badge order swap - 95 >
Air Conditioning - 95 >
Leather ** -  95 >
Twin side impact bars added to doors - 95 >
Locking wheel nuts - 95 >
Additional Engine Stabiliser added - 95 >
Red V6 engine cover replaced with black V6 Ecotec cover - 95 >
New fuel tank design with in-tank fuel pump - late 95 >
Uprated front torsion bar - mid 95 >
Changed rear disc size from 260mm to 270mm- late 95? >
Improved tie rod ball joints (steering rack) - 96 >
New type front lights  - 96 >
New V6 5 spoke 'F-Line' Alloys - 96 >
Twin airbags - 96 > (removed adjustable steering column height)
Seven function fuel computer - 96 >
New range of exterior paint colours - 96 >
White faced 'vision' dials +  battery/oil centre dials - 96 >
Updated airbag control unit (improved diagnostics) - 96 >
Battery Jacket -  96 >
Twin cog sunroof motor - 96 >
Modified sunroof cassette assembly
(for twin cog) - 96 >
Alarm + Immobiliser (cat 2) - Motronic ECU modified - 96 >
Improved cam belt material with change interval increased to 80,000 miles - 96 >
Free-wheeling front door lock barrels - 96 >
Blaupunkt CD300 Audio - 96 >
Improved V6/Turbo front brakes -
288mm x 25mm with 57mm single piston - 96 >
Improved V6 brake hydraulic modulator - 96 >
Improved engine compartment/wing/bonnet insulation + battery jacket - 96 >
Improved 'neutral shifting' auto gearbox option - 96 >
New fuel hose material used - 97 >
Stronger headlight relay (90532627) - Feb 97 >
Free-wheeling lock cylinder on rear tailgate - 97 >
Uprated 69 amp/hr battery - 97 >
X25XE engine replaces C25XE (short block only) - 97 >
Modified Cam Belt cover and tensioner wheel assy - 97 >
** cloth interiors were a 'cost reduction' option on the late V6s - can indicate ex company car/rental car or very tight arsed original owner.

Special Edition V6's:
There were no engine modifications made to either the SE9 or V6 DTM editions.
As with the entire Calibra range, all SE/LE modifications were purely cosmetic (apart from the DTM and one of the 16v SE's - these featured tuned suspension)

SE3 V6 - '93-'94  (??? a rumour ???)

DTM V6 : '95-96 (34 produced)

16v, 16v turbo and V6 versions
Rare, yellow DTM decal graphics
  Glacier White  in colour
Body coloured handles and roof bars
White 16" BBS Alloys
V6 Centre Dial Set (Voltage/Oil)
20 mm lower than std V6 on DTM Irmscher springs + shocks
Irmscher rear spoiler with brake light
DTM 'chequers' cloth interior (anthracite leather was extra cost option)
Alarm & Immobiliser (Cat2)
No aircon as standard
Twin airbags, side impact bars & seatbelt pre-tensioners
SC804 Cassette/CD head unit with CD autoloader in boot
DTM plate
on ashtray cover


SE9 V6 : '97-'98 (308 produced)
Last of the V6's; produced in 'Flame Red' only
16" BBS Alloys with champagne finish (std V6 wheels are 15")
Irmscher rear spoiler brake light (Irmscher part no:27 01 405)
NO Sunroof - this saves 15kg in weight
Black 'anthracite' leather & aircon
Alarm & Immobiliser (Cat2)
Some have Vectra V6 front brakes (slightly larger)
May have X25XE engine number (used X25XE short block only)

Cliff Motorsport Edition V6 : '95-'96
(only available through Opel, 19 produced)
Opel Calibra Cliff available with 2.0l 16v or 2.5l 24v engines.
16" BBS Alloys
Irmscher springs & shocks (20mm lower)
Irmscher exhaust backbox
Irmscher front & rear bumpers
Irmscher smooth bump strips (all round)
Grundig head unit with Bose speaker system
Cliff emblem on doors, tailgate and on ashtray cover
Grey cloth interior, Air Conditioning
Twin airbags, side impact bars & seatbelt pre-tensioners
No indicators on wing
Available in three unusual colours:
'Ocean' - 'Polar' - 'Barracuda'


V6 Production Numbers - UK, Vauxhall
Info from Fraz's site

1993:  134
1994:  755
1995:  746
1996:  738
1997:  740
1998:  103

Total V6 DTM's imported : 34
Total V6 SE9's imported : 308
Total Production Number (all UK V6's) :  3216

Full anti-corrosion protection
was applied to late V6 models
(part way through 1995 on)
Supported by a six year anti-corrosion warranty.

  • partial use of zinc coated metal sheet for body panels
  • zinc phosphated bodyshell primered electrostaically (cathodic)
  • all weld seams and joints sealed with protective compound
  • anti-corrosion primers used on bonnet, doors, wings, sills and tail gate
  • final paint finish applied electrostatically 
  • pvc coating applied to wheel arches and other under body areas
  • polymer reinforced anti-corrosion wax pumped into doors, sills and underbody cavities.
  • plastic wheel arch liners, front - full, rear - partial
  • sound damping materials applied to front door panels and rear wing interiors.


Vauxhall recommended tyre pressures (VA0998 July 1996)

V6 calibra - 205/55 R15    34 psi front / 31.5 psi rear

Turbo calibra - 205/50 R16   33 psi front / 30 psi rear

space saver spare wheel - 61 psi


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