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Lotus Eleven (2007 year). Manual - part 5

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Lotus Service Notes

2-Eleven

2-ELEVEN.F - TRANSMISSION

Clutch

The 2-Eleven is ﬁtted with an uprated clutch cover assembly rated for a maximum torque of 362 Nm, and

which enjoys a mass reduction of 0.6 Kg over the regular cover. Also ﬁtted is an uprated friction plate which

uses 4 steel compression springs in the cush drive hub, in place of the regular item's 4 rubber blocks.

Differential

The 2-Eleven is ﬁtted as standard with an 'open' bevel gear differential, supplemented by switchable Lotus

Traction Control (LTC), with an option package of variable LTC with Launch Control. For full details of these

electronic systems, refer to Section 2-Eleven.M

Two types of optional Limited Slip Differential (LSD) are also available.

Torsen Type: A Torsen (TORque SENsing) gear type LSD limits the speed differential between the two rear

wheels by mechanically distributing the applied torque in accordance with the available grip at each tyre. The

LSD uses worm wheels to interconnect the two output shafts and uses the poor torque reversal efﬁciency

of this type of gearing to ensure that both wheels are always supplied with driving torque. This feature can

enhance vehicle performance in some competition events, and help maintain mobility in some types of soft

ground condition.

Apart from the taper roller bearings supporting the differential in the transmission case, the LSD is not

serviceable. For details of bearing preload adjustment, refer to Service Notes sub-section FJ.6. There is no

special oil requirement for the Torsen LSD. All factory supplied transmission assemblies originally built with

Torsen LSD are identiﬁed on the bar code label applied to the top surface of the transmission case; The 3rd

character of the 7 digit code is 'O' for open differential, and 'L' for limited slip.

Plate Type: A competition type friction plate LSD made by TRD is available in both '2 way' and '1.5 way' variants.

This type of LSD uses a pack of friction clutch plates between each differential output gear and the differential

carrier. The load applied to the clutch pack is proportional to the input torque via a cam and ramp angle design

incorportated between the 4-pinion spider (driven by the crownwheel) and the two clutch pack assemblies. The

'stiffness' of the LSD operation is dependent on the ramp angle which may be speciﬁed on ordering. A '2 way'

LSD uses the same ramp angles for drive and overrun to provide similar slip control in both conditions. A '1.5

way' LSD uses different ramp angles for drive and overrun to reduce the clutch pack load on braking. There is

no special oil requirement for the plate type LSD, but to maintain design performance, inspection and cleaning

of the plates should be carried out every 15,000 miles (25,000 km) by a competent agent.

2-ELEVEN.G - WHEELS & TYRES

Optional on the 2-Eleven are 240R type lightweight forged alloy 5-spoke roadwheels, which at 7x16 and

8x17, are ½ inch wider, front and rear, than the standard Exige wheels, but retain the standard insets of + 31.3 mm

and + 38.0 mm. The wheels are ﬁnished in either Satin Black or High Power Silver, with 'Lotus Sport' moulded

into one of the spokes of each wheel. The Lotus speciﬁc, regular Exige Yokohama A048 tyres, identiﬁed by

'LTS', are ﬁtted as standard. Each wheel is retained by four standard Elise/Exige spline head 60 degree taper

seat bolts, for which a splined adaptor tool is stowed in the vertical tube of one of the roll-over bar backstays.

No security coded wheel bolts are used.

Note that these forged alloy wheels incorporate a steel centralising sleeve to locate onto the hub spigot,

and is normally retained in the wheel. A smear of copper grease on the spigot will help prevent corrosion be-

tween the hub and sleeve causing the insert to become separated from the wheel.

2-ELEVEN.J - BRAKES

The anti-lock braking system is uprated in the following respects:

Motorsport brake pads (Pagid RS14) are ﬁtted front and rear together with cross-drilled brake discs;

Steel braided brake hoses ﬁtted all round;

Optional Castrol 'SRF' synthetic racing brake ﬂuid. Over 500°F boiling point. Dot 4.

Brake callipers painted yellow.

Lotus Service Notes

2-Eleven

Page 18

Access to the brake master cylinder reservoir is available via a small panel in the driver's side front body;

release the screw fastener using the tool provided in the roll over bar backstay, and withdraw the panel. To

reﬁt, engage the tongue beneath the front end of the aperture, and secure the rear end with the fastener. Note

that to avoid erroneous low ﬂuid tell tale activation under extreme track use, it may be necessary to ﬁll the ﬂuid

reservoir to the base of the neck.

Option

An optional brake upgrade comprises larger front discs (308mm vs. 288mm) mounted on alloy centres

and clasped by A.P. Racing 4- pot callipers.

Brake Pad Bedding

If new brake pads and/or discs are to be ﬁtted, a bedding-in procedure should be followed:

WARNING; This procedure should be carried out only on a closed track, paying appropriate regard to

any other track users. Do not attempt on the public highway.

The purpose of brake pad bedding is to:

Transfer a layer of friction material onto the disc faces to achieve maximum performance;

Stabilise compressible materials to avoid a spongy pedal;

Boil off volatile elements in the friction compound;

Align the pad and brake disc surfaces for full contact.

If the pads are not bedded in correctly, or are used aggressively straight after ﬁtting, pad glazing may oc-

cur. This condition results from resins in the pad material crystallising on both the pad friction surface and the

brake disc surface, producing brake judder and vibration. Also, rapidly escaping volatile elements and moisture

from the resin, in seeking an immediate escape route out of the friction compound, can create small ﬁssures

that can lead to cracking and chunking of the material.

Bedding Procedure;

To generate some heat in the discs and pads, perform 4 to 6 stops with medium brake pressure from

around 70 mph (110 km/h) to 40 mph (60 km/h), allowing around 30 seconds between stops. The pad

temperature should not exceed 400 degrees C.

Immediately after this procedure, carry out one high speed stop with medium to heavy brake pressure,

without activating the ABS, from around 80 mph (130 km/h) to 40 mph (60 km/h).

Perform 3 or 4 recovery stops to clean the discs and pads, using light pedal pressure from around 70 mph

(110 km/h) to 40 mph (60 km/h).

Repeat the high speed stops, including the recovery stops, a further 2 or 3 times. The brakes may now

be considered fully bedded.

New Pads on Used Discs

If new brake pads are to be ﬁtted on used discs, it is recommened to chamfer the edges of the pad to

allow optimum bedding.

Parking Brake

Immediately after track use or hard brake usage when the discs are still hot, if possible, avoid using the

parking brake (chock wheels) to prevent heat transfer into the pads and brake ﬂuild.

2-ELEVEN.K - COOLING

The 2-Eleven uses the standard horizontally mounted radiator, with twin cooling fans on its underside.

The fans are switched individually by the engine ECM in conjunction with a fan control module mounted in

the chassis front well, behind the radiator. One fan is switched on at 98°C on rise, off at 93°C on fall, with the

second fan motor run in parallel, and switched on at 103°C on rise, off at 98°C on fall.

Twin front mounted oil/air coolers (std. Exige hot climate spec.) are ﬁtted, one ahead of each front wheel.

An engine intake air chargecooler radiator is rubber mounted behind the engine, with cooling airﬂow gathered

by body apertures alongside the rear of the cabin, and fed via convoluted ducting to a collector on the forward

side of the chargecooler. Air exhausting from the chargecooler radiator escapes via a rear transom aperture.

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Lotus Service Notes

2-Eleven

Engine Bay Ventilation

The body of the 2-Eleven incorporates

four air intake ducts;

Grilled air intakes at each side of the front

scuttle, feed air via ducting formed within

the body sides to the engine bay; the left

hand duct feeds a cool air supply with a

small 'ram'effect to the engine air cleaner;

the right hand duct feeds cooling air to

the front of the engine bay.

Two grilled air intakes at the rear of the

cockpit sides supply a plenum on the

front of the chargecooler radiator.

Hot air exhausts from the engine bay via

an aperture in the rear body.

2-ELEVEN.L - FUEL SYSTEM

In order to meet the fuelling requirements of the 255 PS engine speciﬁcation, a high output fuel pump is

ﬁtted in the otherwise unchanged tank. This pump is slightly longer than the standard item and requires a new

alloy cap (replaces original plastic cap) to retain the pump in the plastic housing inside the tank.

Engine bay cooling Chargecooler airﬂow

ohs161B

Engine intake airﬂow

Lotus Service Notes

2-Eleven

Page 20

2-ELEVEN.M - ELECTRICAL

The 2-Eleven is available with three levels of lighting equipment:

Track; with no lighting equipment.

Race; with rear turn lamps, brake lamps and rear fog lamps.

Road; with full lighting set, but no CHMSL.

Lighting Switches (if ﬁtted)

Principal lighting functions are control-

led by a row of three push button switches

mounted in a nacelle below the scuttle top

edge; for the rear fog switch (if ﬁtted) see

later. Each switch is pressed once to switch

on, and pressed a second time to switch off.

A symbol accompanies each switch to indicate

its function.

Sidelamp Switch

Positioned in the right hand end of the panel, this switch functions with or without the ignition, and switches

on the sidelamps and instrument/switch illumination. A tell tale in the switch button lights up green to indicate

when the circuit is active.

Press the switch a second time to switch off the sidelamps, but note that the headlamps must ﬁrst be off

(see below).

Headlamp Switch

Centremost of the three switches, that for the headlamps functions with or without ignition, and switches

on the headlamps together with the sidelamps and instrument/switch illumination. A tell tale in the switch but-

ton lights up green to indicate when the circuit is active. The steering column lever switch (see later) is used

to select main or dip beam.

Pressing the switch a second time will switch off the headlamps, but leave on the sidelamps (see

above).

Hazard Warning Lamps Switch

The hazard warning switch is located at the left hand end of the panel and has an icon in the switch but-

ton which is back lit when the ignition is switched on. The switch is operative at all times, and when pressed,

causes all the turn indicator lamps to ﬂash in unison. The turn lamps tell tale and the hazard switch icon will

also ﬂash. Press a second time to switch off.

This facility should be used when the car is stopped on the highway in circumstances where a warning

to other trafﬁc would be judicious. Use of the hazard warning lamps may be subject to local trafﬁc laws, with

which drivers should familiarise themselves.

Instrument Illumination

A small button is provided on the steering column shroud ahead of the ignition switch, by which the bright-

ness of the electroluminescent instrument illumination may be adjusted. To cycle through the range of bright-

ness, ﬁrst switch on the lights, and then press and hold the button before releasing at the desired setting.

Note that this dual function button also resets the trip distance recorder if pressed only brieﬂy.

Headlamp switch

Hazard switch Sidelamp switch

RHD shown

ohs163B

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