Mardave V12-CE Setup Manual

V12-CE SETUP MANUAL
V12-CE SETUP MANUAL
V12-CE SETUP MANUAL
INTRODUCTION
The V12 ‘CE’ kit shares many of
the same parts as the older V12 kits. However, both the main chas­sis plate and new front suspension plate are now made from either
GRP or Carbon composite material,
and these need careful preparation. Round the edges with a light rub
down with 400 wet/dry paper (a V12 runs close to the ground and smoothing these edges prevents the chassis from grabbing at the carpet during a race). Then care­fully seal the edges with a thin layer of Super Glue to help pre­vent de-lamination during impacts.
Club racers at WSMCC, but does
make reference to the changes required for racing at other clubs which have different track sizes and layouts, and for racing at
National level (to current BRCA
rules) too.
It is also assumed that the driver has bought the additional differ­ential rear axle to use on the car. Buying one is not 100% essen­tial, but most drivers agree that you will get a better driving car if you install one.
1. PARTS PREPARATION
On the CE chassis, the wishbones
mount directly on the front suspen­sion plate. They must be mounted
at on the front plate and the other
way up from the standard V12 kit.
Mount them with the lugs facing ‘upwards’. Do not add shims or
washers under the front end of the wishbones to give you castor like you used to on an old V12 chassis.
You’ll add shims, but you’ll do this
under both ends of the wishbone to alter the ride height once the rest of the car is built up; castor is best changed by angling the plate itself. It is best to get castor through
angling the whole plate, not by angling the wishbones on the
plate. We have found that forcing
a twist in the wishbones by adding spacers under their front end is good to start with, but the plastic the wishbones is made from has a
tendency to ‘creep’ and will try to
re-mould itself back it its original shape over time. The problem is that your left and right hand
wishbones won’t always creep at
the same rate, and after a week or
two you’ll have different castor on
each side – not good for consist­ent handling!
2. FRONT END
Wishbones lug side up.
Mounted at on the front plate.
No shims under here!
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The holes you use to bolt the wish­bones to the front plate depend on the type of track you run on and how you like the car to han-
dle. Wide wishbone spacing helps
prevent grip roll in the fast sections but reduces steering a bit through slow, tight sections of tracks; a long wheelbase promotes stabil­ity at high speed while a shorter wheelbase allows faster changes of direction. At this point many driv­ers ditch the self-tapping screws that come in the kit and use slightly
longer (12mm) button head M3
machine screws to give a stronger
mount when xing the wishbones
to the plate. Since the 4 holes for each screw are quite close togeth­er you should also use a relatively
large diameter M3 washer under the each of the screws’ heads to
help spread any loads. For the time being, screw them all down tight.
2.A. FRONT END
In this case, wishbones set to
“long and wide”.
M3 washer between screw
head and plate.
NOTE: do not use less than 2mm spacing on the rear two screws – doing so will allow the head of the rear screw holding the wishbone to the front plate to hit the chassis and tweak the front plate.
Now, add the central screw, but do not add anything between the front plate and chassis - we have found
that having a bit of ex in the plate
gives better front bite mid-corner and more even tyre wear. Tighten
the screw’s top nut so that it com­presses the plate to give about 1.5’
camber.
2.B. FRONT END
1mm thick washer under front bolts.
No washer under rear bolts.
Standard Nut
M3 “Low-Prole” nut is about 1mm
thinner than a standard nut.
V12-CE SETUP MANUAL
The steering system is easier - as­semble all the parts and make sure
they all move freely. Add a 2mm
shim under the balls on the steering arm (and use the bottom holes in the servo saver) to get the steering track rods as horizontal as possible and minimize bump steer.
Lastly, make sure that the wish­bones are seated level. Some­times they can sit unevenly (this
can happen if any mould ashing
is not trimmed off the wishbone mounts or steering blocks during the build, or from racing impacts). To check the wishbones, put the
chassis on a at surface, centre
the steering and measure the clearance of the stub axels off the ground. Left and right sides must be identical. If they are not, check
for mould ashing and trim it, check
that kingpins and stub axels are straight and replace any defective parts.
2.C. FRONT END
“Ride Height” of left and right stub
axels must be identical.
Approx 2mm of spacers under the pivot ball to eliminate bump steer.
This is almost identical to all other V12 kits, the only difference is the
damper tube. Assemble the pod and add the damper tube’s ball
stud, axel bearings and diff. Some-
times the rear pod’s pivot ball can be stiff when tted in its hole in the
pod base plate. This is not good. It is wise to give the ball a light rub down by spinning it up in a drill and polishing it with 400 wet/dry – this will give a smoother movement, but be careful not to make it so small that you get any slop!
3. REAR END
If the rear pivot ball is tight in the cup, remove
it and sand it smooth with wet and dry paper.
This pivot ball has had a rear guide pin added to it via a grub screw.
The ball can rotate freely in the cup with just the weight of the pin.
V12-CE SETUP MANUAL
Next, add the rear spring screws and nuts to the back of the chassis.
Add a washer between the rear
guide pin and the chassis – this will stop the pin digging into the chassis and reduces the risk of it shaking loose or pulling through the chassis in a big impact (new
part V9BT does this for you!). At
this point, check that the rear pod is moves freely, sometimes the hole
in the pod’s base plate where the
pivot pin goes through needs to be reamed out.
NOTE: this is just the hole in the base plate itself, NOT the o-ring and not the hole in the o-ring holder!
3.A. REAR END
M3 washer under the rear pin – this
will help stop chassis denting.
If you are using large diameter rear tyres (50-52mm diameter) then a
1.0 - 1.5mm thick washer under the front pivot ball can be a good idea.
With tyres this size you’ll have to
loosen the rear springs right off to
get 3.5mm ride height. This will
give you a nice wide gap between the bottom of the rear pod and the top of the chassis but can, in fact, bring the bottom of the rear pod close to horizontal when the car is sat at ride height. Horizontal is not good for handling when you accelerate – run the front of the pod angled up to be at least 2mm higher than the rear. For smaller diameter rears you can remove
washers from under the pod’s ball
joint, or use none at all.
3.B. REAR END
Approx 1.5mm clearance be-
tween pod and chassis when the
car is resting on its wheels.
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V12-CE SETUP MANUAL
The new, adjustable rear pod is dif­ferent – ride height is changing by swapping the axle bearing cams; rear spring tension is only used to get the required chassis droop and is then left alone. The means no washers are needed under the front pivot ball, even if larger tyres are used, resulting in your whole pod
(and CoG) being up to 2mm lower.
Just remember that when you change the cams your gear mesh will also need changing.
3.C. REAR END
Use a “Low” cam as your rear
wheels wear down.
Use a “High” cam when your
rear wheels are new and up to
51mm diameter.
This is a new part for this kit and has a big impact on car handling. The short story is that it affects how the rear of the car behaves as you go through corners. The longer story is that oil thickness changes the speed of the piston, which changes how far/fast the chassis can roll as you corner which, in turn, affects how weight is transferred and the outside tyre is loaded up. Rear spring stiffness / diff tightness also come into play and you risk some really poor han­dling if any of the settings are out! Getting it right is a careful balance of oil thickness, diff tightness and spring rate.
Always keep the damper tube topped up with oil. NOTE: There is a difference between the units used to measure oil thickness.
WT is not the same as CST so 30,000wt oil will be different to 30,000cst oil.
30,000wt oil is good on larger,
faster tracks and down to 12,000wt is good if you need faster weight transfer and quicker steering response on tight tracks.
Re-ll the tube every 3-6 runs,
whether it feels like it needs it or not - wipe excess off the rod and clean the inside of the tube with motor spray. Pour a small amount of oil into the tube and smother
the rod’s grooves in the stuff.
Slowly slide the rod into the tube and give it a bit of a bounce and twist as you push it in so that the
oil is evenly distributed. Expect
to get some oil squeezing out of the breathing holes and some left on the rod once it is fully in – this
way you know it is completely full
each time re-ll it.
As for handling:
1. Rear end ‘hops’ on acceler­ate out of corners - softer rear springs, lighter damper oil or loosen the diff.
2. Inside wheel front wheel lifts (or car grip rolls) in corners ­harder rear spring and damper oil use smaller diameter, harder tyres.
3. On-power understeer out of
corners - loosen the diff; tighten it for oversteer.
4. DAMPER TUBE
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V12-CE SETUP MANUAL
Recent BRCA ruling now recog­nises three forms of power for running a Mardave / GT12 car – 4cell/G2, 1s LiPo/13.5t brushless or 2s LiPo/21.5t brushless.
4-CELL/G2:
This is a very easy system for a beginner to use - components are cheap and reliable and there is a wide variety available. However, it is not so suitable for top end com­petition because getting the very best out of a motor and cell is ex­tremely time consuming, expensive
and difcult.
For this system, only the Mardave
G2 motor is eligible, speedos
must retail for under £65 and have
reverse but there is free choice of cells. The CE kits come with a bat­tery tray that is perfect for the 4-cell packs.
1S LIPO / 13.5T BRUSHLESS:
Slightly more powerful than the 4-cell/G2 system, zero mainte­nance and the most popular sys­tem for top end club and National racing. However, the low voltages of the 1s LiPo packs mean that speedo choice is tricky – only a few (expensive) speedos work properly, and cheaper ones will need an ad­ditional voltage booster installed. Speedos do not need reverse.
The most popular speedos are:
1. HobbyWing 1s: install the 508 version of the software for
full ‘blinky’ mode. This speedo is
slightly larger than the other speed­os below, but it is the cheapest at about £110 in the UK (or £70 from Hong Kong).
2. LRP SXX Stock Spec: prob­ably the most expensive of the three (around £175 UK price) but comes with the best warranty and manufacturer backup too. If possible, get the Version 2 unit as some software versions on the Version 1 units can be less reli­able than others.
3. Nosram Pearl Version 2: es­sentially the same as the SXX V2, but in a red box rather than a blue
one. Don’t get the V1 units as these don’t have 1s LiPo capabil-
ity. New cost is usually around £150.
4. Fusion Exceed: comes with a perfectly good motor for £95 but
will need a voltage booster tted.
Not eligible for National racing as
it has no ‘blinky’ mode.
Motors can be any 13.5t from the BRCA EB list (there is no restric-
tion of price any more). Popular choices are the HPI Flux, Fusion
Exceed, Team Powers Plutonium.
The lexan battery tray that comes in the kit will take most varieties of 1s LiPo cell and offers a degree of
extra protection too. Mounting the
cells in the designated place will give a reasonable balance and setup for medium to high speed tracks.
Another option is to use ‘Cobra’
battery boxes to hold LiPo cells and to mount them lengthways (slightly to the left) down the chas­sis rather than across it. This will get the weight closer to the centre line of the chassis and is generally better for faster changes of direc-
tion and faster, atter cornering. If
you choose to do this you should position the cell, speedo, servo and receiver very carefully to help counterbalance the off-set weight of the motor.
2S / 21.5T BRUSHLESS
A new idea but extensive testing
has proved it to be very close to
the 13.5t / 1s setup, with none of
the low voltage problems. The
BRCA support this setup for club
racing but is not recognized at National level.
For cells there are 3 main
choices:
1. Hard-cased, mini LiPo packs used in the micro off-road buggy classes. Small, very light but still enough punch and capacity to last an 8 min race. There are battery trays available from Mar­dave that house these perfectly.
2. New 1s/2s packs for GT10
cars (Intellect CC2S3200V7 or Yokomo YB-P228BE). Same
physical size as a standard 1s
pack (so t the standard cell
holders) but are internally wired to give 7.4v.
3. “Shorty” packs used for 1/10 buggies. Taller than the
1s/2s packs (25mm compared
to 18mm) and are signicantly
heavier too. However, they offer faster re-charge times between races For speedos and motors try
a HobbyWing “Just Stock” or SpeedPassion Citrix or Reventon “S” speedo and any 21.5t motor that has a xed endbell (Hobby­Wing Stock, SpeedPassion V2 or V3 Ultra Sportsman etc).
5. POWER: CELLS, SPEEDOS AND MOTORS
V12-CE SETUP MANUAL
The chassis is drilled for a standard size (Touring Car size) steering ser­vo to be mounted on the right hand
side of the chassis. This is ne for
oval Hot Rod racing but does not give an ideal weight distribution for circuit racing.
You’ll get a better balance if you
mount the servo on the left hand side of the chassis. It is also a
good idea to invest in a ‘low-prole’ type servo (eg Savox 1251MG or
Futaba s9550 for example) since these are short front to back, and using these will free up some more room for cells and electrics in the
chassis. Choosing a servo with fast movement (<0.10 sec to 60’ at 6V) and reasonable torque (>4Kg/
cm) is also wise. Dedicated 1/12
scale servos can be good as they are light in weight, just as fast and usually have lower current draws, but they are often longer in the body (so take up more room) and, as they are so slim, they need to be raised off the chassis so there is clearance for the servo saver to move freely. It is a close call be­tween the two types and really de­pends on budget and how/where you plan to mount your cells.
NOTE: the holes that come pre­drilled in the chassis are de­signed to accept Futaba makes of servo. The holes are spaced so that the central output spline on most Futaba servos is dead
centre on the chassis. Sa­vox servos do not have the same position for their out­put splines and, although the 1251MG model will t the holes as they come, it will not be dead centre.
If you choose to re-drill your servo holes, mark them extreme­ly carefully. Get your steering assembled, mount the track rods onto the servo saver and then mount that onto the servo itself. Position the servo so that the track rods are perpendicular to the centre line of the chassis and this will give you reasonable
Ackerman change.
6. SERVO
Lexan shells are lighter, ABS ones
can be a little tougher. Some good, and popular choices are :
Lotus GT1: most front end down­force of the common shells. Good
on slower, twisty tracks, but you’ll
need to add a bigger rear wing and probably use small diameter, harder compound front tires to sta­bilize it on faster tracks.
Mazda Speed 6: good aerodynam­ic balance makes this the safest, most forgiving shell to drive.
Ascari GT3: half way between
the Lotus and Mazda for handling. Common favorite for many drivers.
GT2 ‘Wedge’: can look nice, but can also look like a piece of
cheese! Aside from looks, be very
careful when mounting it on your chassis as the front/rear position has a massive effect on aerody­namic balance – 2mm forwards gives oversteer, 2mm backwards gives understeer. Front and rear wheel mould lines are not an ideal shape.
Calibra: another good looking shell but complex molding splits easily and a high roof line and high rear wing positions make it unstable / prone to grip roll through high speed corners.
Porsche 911: Soon to be re­leased.
All the above are ne for club meetings. Only the Ascari, Lo-
tus, and GT2 shells are permitted for Nationals.
A nal word on bodies – many
drivers suggest investing in a set
of vertical rear posts or a V10M ‘Banger Mount’ and have these
mounted to come through your shell under the rear wing. If you turn them so the body pin holes face front to rear the pins are then easy enough to get in and out.
7. BODY SHELL
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V12-CE SETUP MANUAL
Ofcial Mardave bumper plates will
be released soon. Until they are, cut a 45mm x 125mm rectangle
of 3mm nylon sheet, round off the
front corners and mount it to the chassis using the two holes usually
used for the front body posts. Drill
another pair of holes in the bumper plate, just in front of the edge of the chassis, and mount the body posts through these. This gives the option to position the posts further forward for better support of the front of the shell, and body posts could spaced from side to side to avoid any awkward moldings in the shell. Lastly, cut and shape some 15mm deep foam, punched holes in this to go over the body posts, and it is job done.
8. FRONT BUMPER
It can be worthwhile to have differ-
ent bumpers to t different shells.
Bumper plate bolted to chassis and
body posts bolted to the plate.
9. GENERAL SETUP
Any small, light, rear wheel drive
car is very delicate to set up right
- small changes have a big effect on the way the car drives. Below are some tips that should keep you pointing (mostly) in the right direc­tion.
TRYRES:
The most important setup tool are your tyres, being on the right tyre at the right time is 90% of getting
your car running well. UFRA pink ‘Medium’ (part number V54P) is
extremely popular as the rear tyre, but front tyre compounds can vary widely depending on track layout, grip level and driver preference.
The JAP range are good - ‘shore’
ratings are a good indication of grip
with low shores (38’ for example)
giving more grip than the harder
52’ shore. JAP ‘Medium’ fronts are
actually the softest and offer most
grip. Start with a pair of 44’ or 46’ fronts, and get a pair of hard JAP 50s and some softer JAP Medi-
ums so you can test what works best for you.
ADDITIVE:
Be careful. UFRA Pinks can take
additive twice a day (maximum)
with no ill effects, but JAP fronts
can get over-softened easily.
Most front tyre compounds pick
up most of the additive they need straight off the track, but some
can be applied on the inside 1/3
of each tyre if you need extra bite. Using additive more than
3 times a week on any tyre will
over-soften it – the structure of the rubber changes and the tyres
just fall apart. A good strategy is
to buy multiple sets of the same
compound and run each tyre just twice each meeting. Sure, this means an increase in expense to begin with but they last longer in the long run.
Contact have recently released a range of tyres for the Mardave
cars. Initial testing indicates that grip is good, compounds take additives well and wear is not excessive. They are more
expensive at £6 (rears) or £7 (fronts) but they do come ‘trued and glued’ which saves a lot of mess. Their 32’ shore rears and either 42’ or 45’ shore fronts are
popular, but true them down to 47mm (front) and 50mm (rear_ for best results. Their drawback is that the wheel rims have no lip on the outer edge – the tire is much more prone to chunking when you hit something. >>
V12-CE SETUP MANUAL
Once you have run any set of tyres, store them in an airtight container or bag. This increases their life
by not allowing them to ‘dry out’
between meetings. It is also a good strategy if you ever run your car at a club that does not allow the use of additive – there is usu­ally enough left in your tyres from the last meeting when you did use additive to see you through the
rst couple of rounds at the non-
additive club when grip is likely to be lower.
After every race, check that your
tyres have not started to come
unstuck from the rims. Even the
smallest unstuck area will encour-
age grip roll. Use either EvoStick
or Super Glue to re-attach the tyre to the rim.
Lastly, it is vital to round off the in­side and outside edges of all tyres. This will help prevent the outer
edge ‘rolling under’ during heavy
cornering. Grip roll is likely if this ever happens.
FRONT SUSPENSION:
Since this is such a simple system it requires very little work done on it. However, since the steering system is so direct, the work you do need to do is extremely important. Make sure each part moves com­pletely freely and there is no stick-
ing or binding. If anything feels stiff, disassemble, clean and
re-assemble. Check that kingpins
are not bent, that track rods have not been knocked out of align­ment, that ball cups have not got grit in them or have too much play and that bearings rotate freely.
REAR SUSPENSION:
Again, very simple, but very im­portant too. The front ball joint can gather dust and get stiff. Remove the ball from time to time and clean. Taking the ball in and out too many times though causes the cup to wear and the ball can then be easily knocked out during a race. If this happens, replace the pod plate straight away. Use the rear spring nuts to adjust your ride height and chassis tweak (more on that in a moment).
As the rear tyres wear down you
will have to change the spring tension again (or change the axel bearing cams if you have the ad-
justable alloy pod). Always leave
at least 1.2mm clearance between the bottom of the rear pod and the top of the chassis when the car is resting at its given ride height. Less than this and the pod will hit the chassis as the rear suspen­sion compresses in the corners, leading to poor handling.
DIFF:
This must run smoothly. Do not
over tighten the diff side wheel nut as this will cause the diff to bind, back it off about ½ a turn and this should be about right. It is also wise to run a 5mm drill bit through the rear wheel axel holes so that the diff axle can rotate freely in it. If the diff feels gritty, take it all apart and clean every­thing (except the thrust race) in motor cleaner, paying particular attention to the insides of the ball
holes in the spur gear. Diff plates
can be lightly sanded to remove the ball-ring and to scuff the sur­face slightly. Re-assemble with just the lightest possible smear of silicone diff grease on the balls (but none on the diff plates). Tighten the adjustor nut extreme­ly gently and by very, very small increments.
The best way to check the diff tension is to get the car on the track (with rear tyres fully ad­ditived but dry) and accelerate
HARD from a standstill. If the
diff slips, tighten it. If it does not slip, back the nut off until it does, and then tighten it a bit. Once set, the diffs can run for weeks, or even months, without the need for adjustment.
RIDE HEIGHT:
Mardaves run at their best when about 3.0 - 3.5mm off the deck.
You will need to keep on top of this as tyres wear down, so be pre­pared to add/remove shims from under the wishbones to change the front ride height and change the rear spring tensions (or rear axle cams) to set the rear ride height.
1.0mm spacer tted under whish bones
Ride Height Spacers – 0.5, 1.0
and 1.5mm.
V12-CE SETUP MANUAL
CHASSIS BALANCE:
The V12 chassis was rst designed
to go around an oval rather than a circuit, so it will turn right better than it turns left. To counteract this, mount your motor on the right hand side of the pod (but space it away
from the pod by 3-4mm by adding
washers between the motor and the pod), locate your cells slightly offset to the left of the chassis and mount your servo on the left of the
chassis too. Check for left/right
balance by placing the fully built up chassis on drawing pins and seeing
if it falls off to one side. Add lead
weights as needed.
For front/rear balance, a 40/60
front/rear weight split is good (the chassis should balance at a point roughly 81mm forward of the rear axle line, but this point may change in position depending on hardness of the tyres, width of tyres and how much additive you are using etc).
Finding the ‘Grip Balance Point’
instead can me more useful.
To nd this, put the car on a smooth, at surface (like a setup
board) with tyres that have just been used in a race. Use a screwdriver blade on the edge of the chassis plate to push the chassis sideways. If the front end slides sideways before the back slides you are pushing at a point on the chassis that is too far for­wards; if the rear slides sideways
rst you are pushing too far back­wards. Change your push point
until both front and rear slide at
the same time – this is your ‘Grip Balance Point’. Once you have
this point, mark it on the chassis and then measure from here to
the rear wheel axle line. Move
any ballast weight about to get the
46/60 split.
Motor is spaced away from the rear
pod – in this case, about 4mm
Use the 1.5mm holes in the front &
rear of chassis to test for balance.
MOTOR GEARING:
Brushless motors are more com­plex to gear then brushed ones. The temptation is to gear up be­cause they have a wider torque band than the G2 motors. Howev­er, while this might give a good top speed, you’ll start to lose accelera­tion out of the corners. The best gearing will give you top speed just before the end of the straight, but only just. Next, after each race, check your motor temperature, ide-
ally it should be less than 60’C. If it is, advance the motor’s timing a
bit (and gear down a tooth on the pinion at the same time); if your
motor is nishing the race with a
temperature in the high 50s then stick where you are. Unfortunately, as rear tires wear, our overall gearing changes. Hence why we cannot say that a
23t pinion on a 70t spur is perfect
for a given track– it will also de­pend on tire size. The best way to
compare gearing is to calculate
your ‘mm/rev’ gure (how far the
car travels for each single revolu­tion of the motor):
mm/rev = (3.142 x pinion x tire diameter) / spur
A gure around 56-58mm/rev is
a good starter for a 12x20m track with a HPI Flux motor on its full
timing advance. Go up to 63mm/ rev on 20x30m tracks.
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V12-CE SETUP MANUAL
FRONT:
JAP Medium, Jap 38, Contact 32’ or 35’ shore tires trued to 47mm diameter (inside and outside edges well rounded off), 6mm wide inside edge additive.
Silver ‘Medium’ spring
Zero degrees toe in/out
3.2mm ride height
5th, central plate screw done up with only very light tension (approx 1.5’ camber)
1.0mm castor shims added under front end of wishbone plate.
QUICK SETUP
FRONT:
UFRA Pink Medium or Contact 32 shore tires trued to around 49mm diameter (edges well rounded again)
and full width additive
Silver ‘Medium’ springs
20,000 – 30,000wt damper oil
Diff set to medium
Motor spaced 4mm away from motor pod
3.2mm ride height
Gearing on 1s LiPo / 13.5t motor (HPI Flux) – 54-56mm/rev
THANKS GOES OUT TO JAMES GARRETT, JOHN PARKER & OTHERS. HAPPY RACING!
© 2012 MARDAVE. ALL RIGHTS RESERVED.
CALL MARDAVE: 01953 861134
MARDAVE, TURNPIKE HOUSE, THE TURNPIKE,
CARLETON RODE, NORWICH, NR16 1NL,
UNITED KINGDOM
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