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Lotus Elise / Lotus Exige. Instruction - part 115

Page 9

Lotus Service Notes

2-Eleven

2-ELEVEN.C - FRONT SUSPENSION

The front suspension is based on standard Elise/Exige componentry, but the angle of the top wishbone

ball joint housing differs to better suit the lowered ride height. For the same reason, re-conﬁgured steering

arms are ﬁtted, being machined from solid EN16 steel billets, and heat treated.

On cars with the optional 'Sports Pack', revised road springs front and rear are ﬁtted on Ohlins dampers

featuring remote gas reservoirs, adjustable spring platforms and separate adjustments for compression and

rebound damping. The 22 compression and 60 rebound damper settings allow the characteristics to be ﬁne

tuned to individual requirements, whilst the threaded spring platforms allow adjustment of ride height and corner

weighting. Recommended front/rear mid-laden ride height for both road and track use is 100/110mm. Front

height should always lie within the range 95 - 110mm, with a corresponding rear setting 5 - 10mm higher.

Each gas reservoir is mounted on the side of the crash structure, and is connected to its damper body

by a steel braided hose. Compression (bump) damping is adjusted by turning the knob on the end of the gas

reservoir canister: Turn clockwise to increase damping, and counterclockwise to decrease. Recommended

settings are as follows:

Road use: 11 clicks from full hard

Track use: 11 clicks from full hard

Rebound damping is adjusted via a

ribbed collar below the bottom spring seat:

Turn clockwise (as viewed from below) to

increase damping, and counterclockwise to

decrease. Recommended settings are as

follows:

Road use: 8 clicks from full hard

Track use: 8 clicks from full hard

The motorsport stiffened and 5-position

adjustable front anti-roll bar (included as part

of the Sport Pack) provides further opportunity

for ﬁne tuning. To stiffen the bar, use a more

forward hole, and to soften, use a more rear-

ward hole. Recommended setting:

Road use: Central hole

Track use: Central hole

Note that the hard Nylon type chassis mountings used with this 'bar require periodic lubrication with MoS

grease at least every 3,000m (5,000km). For suspension geometry refer to Section 2-ELEVEN.TD - TECHNI-

CAL DATA.

2-ELEVEN.D - REAR SUSPENSION

On cars with the optional 'Sports Pack', revised road springs front and rear are ﬁtted on Ohlins dampers

featuring remote gas reservoirs, adjustable spring platforms and separate adjustments for compression and re-

bound damping. Recommended front/rear mid-laden ride height for both road and track use is 100/110mm. Front

height should always lie within the range 95 - 110mm, with a corresponding rear setting 5 - 10mm higher.

The 22 compression and 60 rebound damper settings allow the characteristics to be ﬁne tuned to individual

requirements. Each gas reservoir is mounted on the rear subframe and is connected to its damper body by a

steel braided hose.

c47B

Lower wishbone

Drop link

Anti-roll bar

Stiff Soft

Lotus Service Notes

2-Eleven

Page 10

Compression (bump) damping is adjust-

ed by turning the knob on the end of the gas

reservoir canister: Turn clockwise to increase

damping, and couterclockwise to decrease.

Recommended settings are as follows:

Road use: 15 clicks from full hard

Track use: 10 clicks from full hard

Rebound damping is adjusted via a

ribbed collar below the bottom spring seat:

Turn clockwise (as viewed from below) to

increase damping, and counterclockwise to

decrease. Recommended settings are as

follows:

Road use: 15 clicks from full hard

Track use: 12 clicks from full hard

All cars are equipped with through bolted spherical joints on the inboard ends of the rear toe-links, allied

to a tubular steel crossbrace connecting the rear sides of these joints to provide 'double shear' support. For

suspension geometry refer to Section 2-ELEVEN.TD - TECHNICAL DATA.

Rebound

adjustment

collar

d50aB

Page 11

Lotus Service Notes

2-Eleven

2-ELEVEN.E - ENGINE

The 1.8 litre 2ZZ-GE engine with VVTL-i (Variable Valve Timing and Lift - intelligent) as used in other

Elise/Exige models, is ﬁtted with a low pressure Roots type Magnuson MP62 supercharger to provide up to 0.5

bar (7 psi) of boost pressure. The supercharger is mounted on the left hand side of the block and driven by a

lengthened version of the multirib auxiliary belt. The unit is self contained and features helix twisted rotors to

minimise output pressure variations, and maintenance free gearing and bearings, requiring no externally sourced

lubrication. An integral by pass valve under ECU control, operates to recirculate air from the compressor outlet

back to the inlet under conditions of idle and part throttle to the beneﬁt of economy and quiet operation.

The supercharger is hung off the new intake manifold by two bolts in conjunction with eccentric sleeves in

order to ensure stress free alignment. An alloy bracket supports the nose of the unit to the RH engine mounting

plinth, and a tubular strut braces the intake end of the unit to the clutch slave cylinder mounting point.

Air is drawn from an enlarged air cleaner through the throttle body and adaptor and into the supercharger

axial intake port. From the outlet port on the compressor top surface, the air is directed through a stainless

steel duct to the LH end of an air/air chargecooler mounted behind the engine, where airﬂow gathered from

an intake duct in each of the body sides aft of the cockpit, is directed by convoluted ducting to a chargecooler

shroud and through the radiator ﬁnning to cool the compressed intake charge. The cooled air exiting from

the RH end of the chargecooler ﬂows via another stainless duct into a cast alloy intake plenum/manifold. The

whole intake tract uses large diameter ducting and generously radiused bends to optimise airﬂow and intake

efﬁciency and minimise any potential throttle lag. A charge air temperature sensor is mounted in the outlet

tank of the chargecooler.

Each end of the chargecooler is mounted by two alloy spacers to a fabricated steel mounting bracket se-

cured to the engine crankcase by a single ﬁxing bolt. A bonded rubber bush at this position supresses vibration

effects, and in conjunction with the rubber hose connections to the inlet and outlet ducts, provides an isolated

mounting of the chargecooler.

A re-shaped breather pipe is used to connect the crankcase breather spigot to the cam cover and circum-

navigate the supercharger.

Road going cars use the standard catalytic converter, which is substituted by a plain pipe on track cars,

but all versions are ﬁtted with a unique exhaust mufﬂer, featuring a double pass design, with single RH tailpipe

exiting through the rear transom panel.

Four special high-ﬂow port fuel injectors are used (common with Cup cars and USA Exige S) in conjuction

with unique engine programming, which incorporates control of the supercharger by-pass valve. The boost

characteristics have allowed the switching point from low to high lift cam proﬁle to be varied between 4,500

and 6,200 rpm dependent on engine load (at normal running temperature). Twin front mounted oil/air coolers

are ﬁtted one each side, ahead of the front wheels.

Accusump

To provide protection against the possibility of oil starvation caused by the extreme g-forces possible with

track use on slick tyres, the 2-Eleven is ﬁtted with an Accusump oil storage system.

A 2-litre Accusump reservoir is mounted

behind the engine on the left hand side of the

rear subframe, and is plumbed into the LH oil

cooler return hose at the front of the engine

bay. The device comprises an alloy cylinder

divided by a sliding piston, one side of which

is connected to the engine oil supply, with

the other containing pressurised air. With

the engine running, the cylinder is charged

with oil provided by the engine oil pump, but

if the pressure should drop for a short period

due to oil pump pick up pipe exposure during

extreme braking or cornering events, the ac-

cumulator air pressure forces the stored oil

into the engine lubrication system to maintain

continuity of oil supply until normal conditions

are resumed.

Pressure

gauge

Accusump

reservoir

e234

Lotus Service Notes

2-Eleven

Page 12

pl4610cca

Connection to chargecooler Chargecooler inlet duct

outlet & inlet

New inlet

manifold

Supercharger

outlet connector

Supercharger

outlet elbow

Supercharger

outlet adaptor

Mounting lug Swan neck

for supercharger adaptor

ﬁxings

Chargecooler Fixing point (s/c inlet)

outlet duct to manifold

By-pass valve

Fixed to engine capsule

mounting plinth

Front

Support strut to clutch

slave cylinder mounting

Alternator anchor

e235

Cooling air intake duct

Chargecooler

Collector

Outlet to engine

Charge air

temperature

sensor

Cooling air Alloy

trunking to Inlet spacer

chargecooler from s/c

Rear

Fixing bracket to

to crankcase

Fixing bracket to

clutch housing Spacers

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