SUPER CHARGE

Herrod Mustang GT v

by DAVID MORLEY pics NATHAN JACOBS/AL ASTAIR BROOK

So the right foot is aching for hundreds of kilowatts of

Walkinshaw W557

blown V8 Ė and a driven rear axle. Have we got a treat for you

ALK ABOUT deja vu: back in 1989, HSV built a model called the SV89. It was based on a VN Commodore and it was white with a fuzzy, veloury, vaguely burgundy interior called Mulberry. Sounds awful, but it was kind of cool. Different. Unusual. So you can understand why I thought I might be having a junk-food flashback when I stepped into the W557 and clocked the burgundy Alcantara that stretches across the dashboard and door trims. And I donít know if itís deliberate or not, but Iíll be damned if the W557 doesnít even smell like an SV89. Spooky.

The Herrod Mustang has a familiar interior, too. As in, if youíve ever sat in a US-market car, youíll be familiar with the crook layout and half-arsed graphics that remain probably the biggest grizzles with the basic Mustang package. This, of course, has nothing to do with the Herrod treatment, but itís still a feature you can do nothing about, short of handing the íStang over to a reality TV show for a quick, sponsor-approved Ďmakeoverí. No thanks.

But the Mustang will become even more familiar, T trust us. Now that the Falcon lives in an urn on the mantelpiece, fans of Blue-Oval performance will be gravitating to the íStang en masse.

Weíve tested a few Walkinshaw Performancemodified HSVs in recent years, including the W507 which, as the name suggests, is packing 507kW. Big news. But now, in response to what Walkinshaw calls ďoverwhelming demandĒ from LSA owners, thereís an even bigger stick available. And itís this monster, the W557. Guess how much power is claimed for it. Go on, have a stab...

Now, taking the HSV GTS from its standard 430kW and all the way to 557, is a reasonably involved process.

The stock supercharger remains but Walkinshaw adds a set of ceramic-coated headers, a cat-back exhaust with an active yodel-flap, a cold air intake, specific ECU calibration and a solid isolator coupling, whatever that is. (Turns out, itís a tougher blower pulley, ícos we checked.) You also get 1000cc injectors and a pretty aggressive camshaft and a tougher set of beehive valve springs. That cam change also involves a new cam sprocket and a bolt kit to marry the stick to the cog. And if the car youíre presenting for the W557 treatment has done more than 20,000km already,

WP will insist on also selling you new head gaskets, head bolts, lifters and lifter guides. Just to be sure, you understand, and to give WPís driveline warranty a fighting chance. All up, youíre now dealing with those 557kW and a gargantuan 930Nm of twist. And youíll be lighter in the pocket to the tune of $13,000, 14-grand if itís done those 20,000km.

The other thing thatís been done is to fiddle the ECU to partly unlock the torque converter in the first four gears. The idea is to take some of the shunt out of the driveline as the hammer falls, but it also makes the car behave as though it has a 2500rpm stall converter fitted. WP swears itís just software, but it gives the car an old-school hot-rod feel.

Over at Herrod Performance, the stock five-litre Coyote lump in your Mustang GT gets a similarly serious boot up the ginger. But instead of opening the engine and changing cams and stuff, Herrod starts with a couple of little mods to the engine (machining some bosses, etc) for it to accept the 2.3-litre Eaton blower. It runs an intercooler between the block and the pump, thereís a revised exhaust system and Herrod guarantees 670 horsepower (call it 502kW). That said, weíve seen 450kW at the wheels on the same package, so the 502 thing might be a bit pessimistic.

Typically for a Herrod car, though, it hasnít just been the engine thatís been fiddled with, thereís also a whole new suspension set-up as well as a means of making sure the overall package doesnít have any shortcomings or rough edges. So, in this Base Compliance Pack (as Herrod calls it) you also get a Ford Motorsport-developed kit that includes new sway bars, shocks, springs and even the entire front strut assembly complete with new top-hats. There are new, stiffer rear bushes and the kit drops the ride height by about 25mm. In manual-transmission cars, you also get a Ford Motorsport short-shifter as part of the $23,500 happy meal.

Now, everybody knows that in 2017, a 12 is the new 15 when it comes to quarter miles. But even that didnít prepare us for what happened when I spooled the Walky up on its converter and let it rip across 400m.

In fact, turns out this is the fastest Holden-based thing weíve tested on a dragstrip. And boy, it feels it, too.

Our best was an 11.69sec at 201.56km/h dead and while a lot of cars would have you fiddling with tyre pressures and holding your tongue a particular way to get down to that, the W557 did it time and time again.

Thanks to demand from owners, there's now a bigger stick

Strip Kings

Our fastest tuned Aussies THE Walkinshaw W557 is the fastest Aussie car MOTOR has ever tested to 100km/h, but the quarter-mile honours go to the Streetfighter FPV GTE tested at Hot Tuner 2012. While it trailed the W557 by a mere 0.02sec to 100km/h (3.83sec) it more than made up the difference over 400m with a stonking 11.54sec effort. Trap speeds sadly weren't published that year, but it would have had to be in the 205km/h region Ė serious speed.

tuned Aussies Another Streetfighter effort sits in third place behind the W557 on our all Aussie speed list, a supercharged VE GTS that clocked 3.91sec to 100km/h and an 11.82sec quarter mile, 11.82sec quarter mile, again at Hot Tuner 2012. Our secondfastest Falcon ever represents the turbo six brigade, Herrod's G6ET clocking 0-100km/h in 4.31sec and a 12.35sec quarter at 188.06km/h at Hot Tuner 2009. Ė SN

The Numbers

Different means, different end Walkinshaw W557 0-10km/h 0.42 0-20km/h 0.83 0-30km/h 1.18 0-40km/h 1.50 0-50km/h 1.82 0-60km/h 2.17 0-70km/h 2.54 0-80km/h 2.89 0-90km/h 3.33 0-100km/h 3.81 0-110km/h 4.29 0-120km/h 4.89 0-130km/h 5.49 0-140km/h 6.13 0-150km/h 6.86 0-160km/h 7.66 0-170km/h 8.51 0-180km/h 9.48 0-190km/h 10.42 0-200km/h 11.46 0-400m 11.69sec @ 201.56km/h 80-120km/h 1.9sec 100-0km/h 33.50m SPEED IN GEARS 1st 63km/h @ 6200rpm 2nd 107km/h @ 6200rpm 3rd 166km/h @ 6200rpm 4th 250km/h @ 6120rpm 5th 250km/h @ 5200rpm* 6th 250km/h @ 4100rpm* Herrod Mustang GT 0-10km/h 0.46 0-20km/h 1.00 0-30km/h 1.43 0-40km/h 1.80 0-50km/h 2.18 0-60km/h 2.90 0-70km/h 3.34 0-80km/h 3.81 0-90km/h 4.25 0-100km/h 4.99 0-110km/h 5.55 0-120km/h 6.12 0-130km/h 6.66 0-140km/h 7.27 0-150km/h 8.21 0-160km/h 8.95 0-170km/h 9.71 0-180km/h 10.92 0-190km/h 11.99 0-200km/h 13.07 0-400m 12.59sec @ 195.81km/h 80-120km/h 2.4sec (3rd) 100-0km/h 37.08m SPEED IN GEARS 67km/h @ 6550rpm 101km/h @ 6550rpm 146km/h @ 6550rpm 187km/h @ 6550rpm 246km/h @ 6550rpm 250km/h @ 4320rpm* As tested by MOTOR: Heathcote Raceway, 10.30am, 12 degrees, dry. Driver: David Morley. *Manufacturerís claim

There was no appreciable heat-soak buggering things up and no hint that any component was getting sick of being beaten on. So, not only is it hella fast, itís also super consistent. Part of that is in the way the tranny works but itís also down to the fact that the GTS seems to have a pretty tactile set of controls that allow you to dial in a bit of finesse with your right clog.

Ultimately, the trick is to heat the tyres a little Ė ahem Ė and then spool up about 2000rpm before steeping off the brake and f-e-e-d-i-n-g in the noise.

By the time youíre into the top of second gear, you can be pinned to the carpet and running that 11.7. Our best 0-100 time? Try 3.81 seconds.

We also tried it with the traction-control left switched on and, while itís a soft kind of intervention, it was still quicker with traction off and a driver paying attention. And your attention will be grabbed, particularly at the top end of the strip where the GTS felt anything but nice. Dunno whether it was the aero or a crosswind on the day or what, but even at 200- plus, the Walky still has its snout in the air and feels intent on waving its front wheels around under you.

It never actually strayed from the lane, but confidence inspiring it was not.

By comparison, the Herrod Mustang was a sweeter thing at terminal whack, but bear in mind it hadnít racked up so many kay-em-aiches in its journey across 400. Itís not that itís lacking urge; quite the opposite. The íStang is the victim of its own ferocity, in fact. Throw in a manual gearbox, a shifter that strikes me to be more about form than function and gearing that just doesnít suit quarter-miling, and you have yourself a car that has the heart, but not the legs to beat 12.59sec at 195.8km/h and 0-100 in 4.99sec.

Let me explain. The clutch in this thing is sharp. Has to be to cope with the urge. But it also means thereís no percentage in trying to slip it out. (A) It wonít do it and, (b) youíd just shag it anyway. So youíre stuck with trying to find a rev point that allows the clutch to bite and not bog the engine, but that also prevents the back tyres from turning into dervishes. Itís a fine line and, to be honest, neither I nor Scotty (Newman) managed to find it in a couple dozen runs. Maybe itís not actually there at all. We may never know.

Now, that shifter. I know little stumpy gearsticks suggest raciness and snap-shifting, but this one seems to me to do nothing more than reduce your mechanical advantage (by moving your leverage

point) on what starts as a manly sort of gearbox in the first place. Sometimes the shifter didnít want to find fourth for me in a hurry; Scotty had trouble with fifth. And even when it does slot in, itís a slow, grumpy, sticky action that just refuses to be hurried.

And then thereís the gearing which, combined with a pretty savage ignition cut at redline, ensures thereís no point in pushing your luck. Which would be okay if the íStang wasnít so fast. But because it is, by the time youíve covered about 370m or so, youíve exhausted the usefulness of fourth gear. Meaning a 400m sprint ends either with the engine laying down on the limiter in fourth, or a run that incorporates four gearshifts. Four, slow, clumsy gearshifts. And that is why the Mustang runs 12s and not 11s. And itís the only reason. And we know that, because we drove a Herrod íStang with the same engine package and an auto box this time last year and it ran 12.1 on a cold, greasy track. As it is, though, with the manual box, the gearing, the limiter and the box-of-hammers gearshift, a 400m run turns into a quarter mileís worth of driver errors.

Of course, quarter-mile blasts arenít the point of the Herrod car, so we pointed it at some corners to see what all that suspension work achieves. And the answer is plenty. While the steering hasnít been directly altered, the firmer set-up gives the Mustang more pointiness. It still lacks the last few touchy-feely percentage points of the W557ís helm, but the Herrod car has lost that Mustang-typical feeling of you being sat right at the back of the carriage and steering the thing by remote control.

The Mustang also lacks the adaptive dampers of the GTS, but the reality is that it doesnít need them. The ride is firm, but beautifully controlled and, for once, it doesnít need to be doing 200km/h to start making sense. And to be honest, the W557ís suspension is really only tolerable in Tour mode, and switching the rotary dial beyond that to Sport or Perf or Race sends ride quality packing.

On a circuit, the extra control enabled by the Fordís manual íbox would possibly give it the edge going into corners, especially since the Walkyís auto box doesnít comply with paddled downshifts in any particular hurry. Through the corner itself, there wouldnít be a lot in it, but the extra apparent footprint and rocksolid stability of the W557 would pay off and then thereíd be a growing gap as the GTS used its superior stomp to rack off towards the next bend. And, when

Now that the Falcon is dead, fans will gravitate to the íStang

it got there, youíd pull more time by being able to stop it quicker, because it sports some of the best big-car anchors weíve experienced. In fact, while the Mustang stopped in a decent 37.1m, the W557 hauled down from the same 100km/h in a staggering 33.5m. And the Walkyís brakes donít just stop better, they feel better, and it remains that the Mustang has a stiff pedal that gives nothing back in terms of info about whatís going on.

On the road, Nth-degree setting up for corners is all a bit academic, and itís in this scenario that the W557 really starts to run away with things here.

Literally. Even relatively small throttle inputs give a huge payback and the sensation is one Iím calling speedboating. If youíve ever been in a speedboat, youíll know what I mean: You hit the throttle and the boat lifts its nose and then climbs up on to the wedge of water itís created before nosing over and gathering speed as it comes up on the plane.

And all with no change to throttle position. Well, thatís just how the W557 feels taking off from the traffic lights. Itís difficult to recall the last time we experienced part-throttle and mid-range stomp like this thing generates and even though the Mustang is fearsomely fast, the W557 is always a step ahead. Itís not that you can get on the noise any earlier, but when you do, the effect is seismic.

Thereís no doubt that the Herrod Mustang is a formidable bit of gear and if a fast Fordie is your thing, youíll love it. Itís also a bit more restrained than the W557, the lopey, gurgling idle of which is theatrical, but guaranteed to have your neighbours dumping their empties over your fence. But nothing changes the way that modded HSV compresses time and space. If you like íem big, loud and fast, then a W557 is where itís at. For now. M

Headline Figures

V8 bruisers square off

HERROD GT MUSTANG WALKINSHAW W557

BODY DRIVE ENGINE BORE/STROKE COMPRESSION POWER TORQUE POWER/WEIGHT TRANSMISSION WEIGHT SUSPENSION (F) SUSPENSION (R) L/W/H WHEELBASE TRACKS STEERING BRAKES (F) BRAKES (R) WHEELS TYRE SIZES TYRES PRICE AS TESTED PROS CONS 2-door, 4-seat coupe rear-wheel 4951cc V8, DOHC, 32v, supercharger 92.2 x 92.7mm 11.0:1 507kW @ 7000rpm 730Nm @ 3600rpm 280kW/tonne 6-speed manual 1813kg struts, coil springs, anti-roll bar multi-links, coil springs, anti-roll bar 4784/2156/1331mm 2720mm 1570/1637mm (f/r) electrically assisted rack-and-pinion 380mm ventilated discs, 6-piston calipers 330mm ventilated discs, single-piston calipers 20.0 x 9.0-inch (f); 20.0 x 9.5-inch (r) 265/35 R20 (f); 285/35 R20 (r) Pirelli P Zero $80,990 Feels unmodified until you spank it, then it goes troppo; compliance Interior quality is still not a Mustang strong suit 4-door, 5-seat sedan rear-wheel 6162cc V8, OHV, 16v, supercharger 103.1 x 92.0mm 10.7:1 557kW @ 6200rpm 930Nm @ 4000rpm 303kW/tonne 6-speed automatic 1841kg struts, A-arms, adaptive dampers, anti-roll bar multi-links, coil springs, adaptive dampers, anti-roll bar 4988/1899/1457mm 2915mm 1616/1590mm (f/r) electrically assisted rack-and-pinion 390mm ventilated/drilled discs, 6-piston calipers 372mm ventilated/drilled discs, 6-piston calipers 20.0 x 8.5-inch (f); 20.0 x 9.5-inch (r) 255/35 R20 (f); 275/35 R20 (r) Continental ContiSportContact 5P $113,490 O. M. G. The fastest of its breed. Ever; impressive brakes; handling Purple wrap on our test car blew, and no, you donít have to wrap yours

If you like íem big, loud and fast, then a W557 is where it's at