The Cars

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The Cars

The Formula Sheane cars are all mechanically identical. The engines and gearboxes are sealed at the factory and may only be opened by Sheane Cars Ltd.

As of 2005, Formula Sheane is the fastest one-make formula in the country, lapping Mondello in fifty-six seconds and Kirkistown in sixty-one. They have a top speed of around 150 MPH and will hit 60 MPH in under four seconds.

full car
chassis
side pods







The chassis is a spaceframe design (tubular steel) with fibreglass bodywork. The engines are the same 1800cc powerplants found in the Lotus Elise, Exige and Caterham 7. They are connected to an VAG five-speed gearbox, driving the rear wheels.

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lump
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Suspension is by un-equal length wishbones at the front and a rear multi-link and trailing arm set-up. At the front the car is held on AVO coil-overs mounted horizontally on the space-frame (above the driver’s knees) at the rear the coil-overs mount conventionally. Suspension is adjustable for camber, castor, toe, and combined bump/rebound damping. Adjustable anti-roll bars are mounted at both ends (inboard at the front).

Tyres are Avon mounted on alloy rims. Brakes are discs with single-piston floating calipers.

That's how are cars are constructed. Now let's imagine you buy one and want to know how to make it go fast.

You're going to need to know how to 'set it up'. 'Set-up' means adjusting all the variables on the car to make it go around the track as fast as it can. It means getting the car to 'feel' right for the driver and making it behave properly around the corners.

The following is a rough guide to how that can be done.

Car setup is part science, part art, part luck. The really annoying bit of it is the amount of variables in play make it very difficult, if not impossible to define exactly what is the solution to any particular handling problem.

You’re trying to balance driving technique, damper rates, spring rates, camber angles, caster angles, toe angles, Ackerman (or anti-Ackerman) angles, anti-roll bar rates, brake balance, roll-centre position and height, king-pin inclination, tyre pressures and innumerable other variables to find a handling package that works. Each of them is interconnected with the others and changing one has an impact on the others.

At this point many people give up and buy a Historic. Don’t despair. There are a few principles that can make life much easier.

The first thing you need to be clear on is what you are trying to make a car do. If your car over-steers horribly in the pit-lane, who cares? It is not going to affect your lap time. Drivers regularly try to find a set-up that feels great in every corner. In reality that is as unnecessary as it is difficult. The first thing you must do when setting up a race car is figure out which corners are most important. Here’s the priority list:

  1. A medium to fast corner leading onto a long straight.
  2. A slow corner leading to a fast straight.
  3. A medium to fast corner leading to a short straight.
  4. A slow corner leading to a short straight.

Why is this the order? Well, your exit speed out of a corner is like saving money; the more you have at the start and the longer you can save it the richer you’ll be. Same with racing; a fast exit onto a long straight gives you a long time to build your speed. It doesn’t matter as much if you come out of a corner like a rocket and almost immediately have to hit the brakes for another corner; you’ve had very little time to let your investment grow. So the most important part of any circuit is fast corners exiting onto long straights (like the Parabolica in Mondello or Honda in Pembrey). If you carry a high exit speed onto the straight, you make bigger and bigger speed gains all the way to the next corner.

So why are slow corners leading to long straights not so important? Primarily because there’s less opportunity to make gains in a slow corner. A five per-cent difference in speed through a 100mph corner means a 5mph difference. A five per-cent difference in a 30 mph corner means a difference of less than 2mph. Also, there’s less handling required in a ‘point-and-squirt’ corner like the Furry Glen in the Phoenix Park than in a fast sweeper like Honda in Pembrey.

Medium-to-fast corners leading to short straights give gains for less time; you have no long straight to build speed so your gain through the corner cannot be built as much. But you can still squeeze out some time if you can carry speed through the corner.

Lastly you have slow corners onto short straights. Any gain made in the corner is small because it’s slow (even if you drive it like Senna) and you have no straight to build on the gain. Think of Birrane’s Bends in Mondello; you are barely on the throttle in the right-hand section before you hit the brakes for the left-hander; so scope to keep the gains you make.

What this means for the driver is after each test session you should assess the car’s behaviour in each corner according to priority. Take Kirkistown as an example:

1) How well is the car coming out of the chicane? (Fast corner leading to long straight)

2) How well is the car coming out of the Hairpin? (Medium corner leading to long straight)

3) How well is the car handling in Fisherman’s? (Medium corner leading to short straight)

4) How well is the car handling in Colonial? (Slow corner leading to short straight)

If your car handles perfectly through the chicane, the hairpin and through Fisherman’s but is a dog through Colonial, be happy. The losses through Colonial will be vastly outweighed by the gains round the rest of the circuit.

This is why you see mechanics despair when a driver gets out of a race car and says ‘it’s over-steering’. It’s the equivalent of going to a doctor and saying ‘I’m sick, you figure it out, I’m off to the pub.’ The least you can do is tell the mechanic where it’s over-steering and where it’s not.

The next thing is to narrow the geography even more. And that means breaking each corner into phases for further diagnosis.

Each corner can be broken into a number of phases. Different drivers, engineers and telemetry systems do this different ways, but let’s take a simple, repeatable method:

Each corner can be broken into three sections:

1) Corner entry

2) Transition

3) Corner exit

Let’s look at what happens in each one:

Corner entry

This is the part of the corner from brake-point until apex. When you hit the brakes the rear tyres lighten and the front tyres gain download as the weight transfers to the front. This happens regardless of what settings you have on springs and dampers. Even if you make your suspension out of solid box-section, you still get weight transfer when you hit the brakes. As you begin to turn in (you may or may not still be on the brakes) the weight begins its transfer from inside to outside as the lateral g-loading increases.

Transition

This is the point at which the car ‘takes its set’. This is an easy way to put something that is a complex interrelation of slip angles and weight transfer. It is basically the point at which the car assumes the attitude it will remain at until the exit phase starts. The transition phase is when the driver is not adding any more turning to the steering wheel and (usually) is transitioning from brakes to throttle. At this point the car will be at maximum lateral g and will be transferring weight from front to back as the brakes are released and the throttle applied.

Corner exit

This is the phase where the driver will move to full throttle and start to unwind the wheel (ideally at the same time). At this point the final weight transfer to the rear is completed as full throttle is reached. The reason it’s important to analyse corners in these phases is because you’ll find totally different things causing similar car behaviour in each of the phases. Let’s take it from the engineer’s perspective; you’re waiting in the garage as the driver comes in. He gets out of the car and tells you the car ‘has too much over-steer’. That’s essentially useless unless he can understand where and thereby why...

If it is corner-entry over-steer, the cause could be brake balance or poor gear-shifting. If it is transition over-steer it could be overly hard dampers, bump-steer, roll-bars, spring rates or a simple ‘pop-off’ the brakes by the driver. If it is corner-exit over-steer it could be over-heavy spring rates or roll-bars or a leaden right foot.

So if you’re the engineer any changes you make will be as likely to make things worse as better if you don’t know where the car is doing what it is doing.

All of this looks very daunting and complicated if you don’t know one end of a spanner from the other, but it isn’t that tricky. A lot of variables are taken out of the equation if you get Sheane Cars to do a basic set-up on the car. They’ll set camber, caster, toe, Ackermann, bump-steer, roll-centres and spring rates. That leaves the less mechanically-minded driver to play with dampers, roll-bars and brake balance.

And here’s how…

When you get to the circuit to set up a new car, the first thing you want to do is get a baseline set-up. Here’s the steps…

1) Set the roll-bars to full soft. 2) Set the dampers to full soft. 3) Set the brake balance to the centre.

Go out and drive the car. It should feel horrible. Like a pogo-stick. It is worth doing this to familiarise yourself with how an under-damped car feels. (This knowledge will come in handy the first time you blow-out a damper and spend weeks chasing the handling problem because you don’t know what a blown damper feels like).

Come in and set the dampers to full hard. Then go back out. The car should feel like a brick. You should notice wheel patter. The tyres should skip over any significant bumps and you are likely to get the wheels ‘skipping’ over the surface under braking. (On cars with separate rebound damping the car will jack-down when the damping is too hard, not usually a problem on cars with combined bump and rebound. If you don’t know what bump and re-bound are, don’t worry about it, it’s way too much effort to explain and it doesn’t apply to our cars). You will get away with harder damping on smoother surfaces. If you’re racing in Donnington you can set the car like a skateboard, if you’re in the Phoenix Park, head for the pogo-stick end of the spectrum. Or bring a jeep.

Now you know what full-hard and full-soft feels like. Now you’re going to find a middle-distance. Take the shocks about four clicks softer all-round (write down any changes you make) and drive it again. You’re looking for the point where you no longer get wheel patter over bumps or skipping under braking. (You should also notice it putting down its power better with less wheel-spin). Once the wheel patter stops, it is soft enough. You’re setting up a race-car not a Rolls-Royce so comfort is not at issue, just get to know your chiropractor.

Now you can set the brake balance.

Pick a long straight where you do most of your braking in a straight line (not when you’re doing a tip-toe trail brake all the way to the apex). When you apply the brakes, keep squeezing them until a wheel locks up. (As soon as it does, come back out of the brakes or you’ll be investing in a new set of tyres). Do not jump on the brakes. A ‘panic’ or snatch brake will almost always lock the front tyres because the snatch causes the wheel to lock before enough weight has downloaded onto the front tyre to get full braking performance out of it. This will teach you nothing. You get on the brakes fast, but smoothly, squeezing up to the lock-up. Not going at the pedal like a bull.

You then take not of which wheel locks up. If it is a front wheel it is easy to diagnose; you see it happen. If it is a rear you diagnose it two ways; first you can see it in the mirror (tricky to do, because the last thing you want to be doing is gazing in the mirror at 140MPH) second, you’ll feel the back of the car get ‘skittish’; snapping erratically from side to side.

When you have diagnosed which end is locking up first, change the brake balance until the front locks up just before the rear. Having the rear lock up first is a good way to introduce yourself to a Marshall. By way of a gravel trap.

Now you have a car that will ride over the surface properly and will stop properly. Now you can make it handle.

As we’ve said before, there is a very complex series of interrelationships happening with race-car suspension, so in some instances things that really should do one thing end up doing another and improvements make things worse. But we’ll ignore all that. Call Sheane Cars if you want to discuss the nuances of suspension geometry. This is the quick and dirty version.

Before you take on the onerous task of setting up a car, a few words on how roll bars and dampers work. Dampers live their lives for two purposes; first to stop your wheels jumping around like happy poodles, second to control the speed at which your car transfers from weight from front to back and side to side.

We’ve already looked at the first, now let’s look at the second.

The stiffer your dampers are, the faster the weight will transfer when you brake, accelerate and turn.

At this point you will say ‘no’ ‘it’s a misprint’ ‘how can that be?’ ‘that’s backwards’.

No it’s not.

Soft dampers allow weight to transfer slowly. Stiff dampers allow weight to transfer quickly. Don’t believe us? Buy a book. (Or call Sheane Cars and annoy us in person).

Let’s be clear; the same weight transfer will occur regardless of your damper settings. Even if you throw them away and just use bare springs the weight transfer will happen. Even if you take the springs out and replace them with box-section, the weight transfer will happen. All dampers can do is control the speed at which it happens. And, once again; the stiffer they are, the faster it happens.

Now, let’s look at their partners in crime; the anti-roll bars.

Anti-roll bars control where the transferred weight goes. Let’s imagine your car has no front anti-roll bar and a rear anti-roll bar made from inch thick Titanium bar. When your car turns into a corner it is going to transfer weight from the inside to the outside. The titanium girder is going to resist that transfer. In doing so, it is going to put all the weight onto the outside rear tyre. That tyre is a) going to hate you, and b) it is very quickly going to have more force applied to it than it has grip to cling on and it is going to slide. And you will have an over-steering car. (You’re also going to have a disproportionately light inside rear tyre, but that gets very technical and needs a calculator, so let’s ignore it. It doesn’t matter much anyway if the relationship between anti-roll bars and springs is well planned. Which it is. On our cars.)

Now let’s say you unbolt the titanium girder and attach it to the front. Now all the weight will be transferred onto the outside front tyre and it will get quickly overwhelmed and your car will slide at the front. And you have under-steer.

So here’s the summary. A stiffer bar will make the end it’s on slide. A softer bar will let it grip better. (At this point engineers are getting dizzy with all the assumptions that makes, but it’s accurate enough the purpose of this.)

So now let’s put it all together. You have a car that can behave on the straights and can brake well. Now you need to do some analysis;

Figure out what are the most important corners on the circuit (see above) and assess what the car is doing in each phase of them. You need to be pushing to do this. Driving like Miss Daisy will tell you nothing. The car has to be on the limit before you get a decent assessment. Now come in off the circuit and address what the car was doing in those corners and in which phase it was doing it.

Okay, this is the tricky bit. But here are some decent rules of thumb.

Over-steer:

1) If you have corner-entry over-steer on the brakes, you either have too much rear brake balance (like a handbrake turn) or you’re a driving legend who’s backing it in like Valentino Rossi. If it’s the former, adjust the brake balance. If it’s the latter, call Ron Dennis. If you are getting corner-entry over-steer and your foot is nowhere near the brake then the problem is the organic, meaty bit in the seat, not the mechanicals. Find an experienced driver for advice or e-mail us.

2) If you have transitional over-steer, in other words as you come off the brake and move to the throttle, you either have too stiff rear dampers or you are popping off the brake. If the former, change ‘em. If the latter, repeat the mantra ‘a smooth driver is a fast driver’ 500 times and take a cold shower.

3) If you have corner exit over-steer, in other words, the car has taken a set, you’re feeding it throttle and the back is coming around on you then the rear anti-roll bar is too hard or the front is too soft.

Under-steer:

1) Corner entry under-steer usually means front dampers are too stiff. But it’s a complex one. And it’s also very unusual. Drivers mouth on all the time about ‘turn-in’ but in reality it’s unusual to find a Formula Sheane car with a Sheane Cars set up on it that has it’s front tyres fully loaded going into a turn and wants to wash out away from the apex. It likely means a bad combination of toe, caster, camber and Ackermann angles.

2) Transitional under-steer is either of two things; either the driver is leaping on the throttle in the middle of a horrible line and trying to drive the car like a snow-plough or it means the car is not rotating at transition. (Rotation is a fascinating thing that results from the overlap of weight transfer, vehicle yaw angle and tyre slip angle. All very interesting. And technical. And not for here. Suffice it to say it feels lovely and is what all racecars live to do.) The quick and dirty version of a car ‘not rotating’ means the driver comes off the brakes onto the throttle and the car responds like a blancmange. If that’s what you are feeling, then your dampers are too soft all around.

3) Corner exit under-steer is a terrible thing that brings shame on your family. It is the result of a front anti-roll bar that is too stiff or a rear that is too soft. It is terrible. Rid your car of it at all costs. A car that is exiting a corner should (in general) reach the outside curb with its rear outside wheel, not its front outside wheel. Not like the Dukes of Hazzard, but rotated enough that the rear is making it to the curb. (And yes, we know you don’t see it in F1. But you also don’t see a thousand kilos of downforce, and the resulting aerodynamic implications in most racing classes.)

A few words on putting all this together…

Look at your tyres.

If your front tyres’ surfaces are wrinkled like hippo-skin and your rears are smooth as glass then your car is under-steering. It doesn’t matter what you think it’s doing. If it is overworking its front tyres and underworking its rears; that’s under-steer and you need to re-calibrate your internal definitions of what under-steer feels like. Same the other way around; if the rears are wrinkled and cooked and the fronts are smooth then you have over-steer and you need to re-calibrate the seat of your pants to feel it.

Most new drivers set up their cars with too much under-steer. That’s how all road cars are set up and it feels ‘normal’. If in doubt, set up with too much over-steer. (At worst it’ll be good training in car control and the spectators will love you.)

If you have under-steer, don’t turn-in more…

New drivers often think cranking on the lock will wring some extra turning out of the front wheels. It won’t if they are under-steering they have no grip left. You make them turn more, you rob grip from them, the exact opposite of what you want. Then when they finally do grip again, they’re pointed into the inside of the turn and they tuck the nose in, snapping the tail out and introducing you to a man in an orange suit with a fire extinguisher.

Lastly. A small dose if realism.

If you are more than two seconds off the pace it is not the set-up. It’s you. Don’t spend your time getting covered in oil trying to find that magical 2.5 seconds. It’s in your driving, not the car. Any of the top drivers will put any car (as long as the wheels are vaguely in the right direction) within 2 seconds of pole. If you can’t, concentrate on improving your driving. Then worry about the car.

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